bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/dialogs/ContentTypesPreferencePage.java - platform/eclipse.platform.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2005, 2016 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.dialogs;

 import static org.eclipse.swt.events.SelectionListener.widgetSelectedAdapter;

 import java.nio.charset.Charset;
 import java.nio.charset.IllegalCharsetNameException;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.MultiStatus;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.content.IContentType;
 import org.eclipse.core.runtime.content.IContentTypeManager;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.jface.preference.PreferencePage;
 import org.eclipse.jface.viewers.IStructuredContentProvider;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.ITreeContentProvider;
 import org.eclipse.jface.viewers.LabelProvider;
 import org.eclipse.jface.viewers.ListViewer;
 import org.eclipse.jface.viewers.StructuredSelection;
 import org.eclipse.jface.viewers.TreeViewer;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.jface.viewers.ViewerComparator;
 import org.eclipse.jface.window.Window;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.osgi.util.TextProcessor;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.KeyAdapter;
 import org.eclipse.swt.events.KeyEvent;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchPreferencePage;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.dialogs.PreferenceLinkArea;
 import org.eclipse.ui.internal.IWorkbenchHelpContextIds;
 import org.eclipse.ui.internal.WorkbenchMessages;
 import org.eclipse.ui.internal.WorkbenchPlugin;
 import org.eclipse.ui.internal.misc.StatusUtil;
 import org.eclipse.ui.internal.util.Util;
 import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer;
 import org.eclipse.ui.statushandlers.StatusManager;

 /**
  * Preference page that allows manipulation of core content types. Unlike most
  * preference pages, it does not work on the preference store itself but rather
  * the content type manager. As such, there are no apply/default buttons and all
  * changes made take effect immediately.
  *
  * @since 3.1
  */
 public class ContentTypesPreferencePage extends PreferencePage implements
 		IWorkbenchPreferencePage {

 	private ListViewer fileAssociationViewer;

 	private Button removeButton;

 	private TreeViewer contentTypesViewer;

 	private Button addButton;

 	private Button editButton;

 	private Text charsetField;

 	private Button setButton;

 	private IWorkbench workbench;

 	private Button removeContentTypeButton;

 	private Button addChildContentTypeButton;

 	private class Spec {
 		String name;

 		String ext;

 		boolean isPredefined;

 		int sortValue;

 		@Override
 		public String toString() {
 			String toString;
 			if (name != null) {
 				toString = name;
 			} else {
 				toString = "*." + ext; //$NON-NLS-1$
 			}

 			if (isPredefined) {
 				toString = NLS.bind(
 						WorkbenchMessages.ContentTypes_lockedFormat, toString);
 			}

 			return toString;
 		}
 	}

 	private class FileSpecComparator extends ViewerComparator {
 		@Override
 		public int category(Object element) {
 			// only Spec objects in here - unchecked cast
 			return ((Spec) element).sortValue;
 		}
 	}

 	private class FileSpecLabelProvider extends LabelProvider {
 		@Override
 		public String getText(Object element) {
 			String label = super.getText(element);
 			return TextProcessor.process(label, "*."); //$NON-NLS-1$
 		}
 	}

 	private class FileSpecContentProvider implements IStructuredContentProvider {

 		@Override
 		public Object[] getElements(Object inputElement) {
 			IContentType contentType = (IContentType) inputElement;
 			String[] userextfileSpecs = contentType
 					.getFileSpecs(IContentType.FILE_EXTENSION_SPEC | IContentType.IGNORE_PRE_DEFINED);
 			String[] usernamefileSpecs = contentType
 					.getFileSpecs(IContentType.FILE_NAME_SPEC | IContentType.IGNORE_PRE_DEFINED);
 			String[] preextfileSpecs = contentType
 					.getFileSpecs(IContentType.FILE_EXTENSION_SPEC | IContentType.IGNORE_USER_DEFINED);
 			String[] prenamefileSpecs = contentType
 					.getFileSpecs(IContentType.FILE_NAME_SPEC | IContentType.IGNORE_USER_DEFINED);

 			return createSpecs(userextfileSpecs, usernamefileSpecs,
 					preextfileSpecs, prenamefileSpecs);
 		}

 		private Object[] createSpecs(String[] userextfileSpecs,
 				String[] usernamefileSpecs, String[] preextfileSpecs,
 				String[] prenamefileSpecs) {
 			List returnValues = new ArrayList();
 			for (String usernamefileSpec : usernamefileSpecs) {
 				Spec spec = new Spec();
 				spec.name = usernamefileSpec;
 				spec.isPredefined = false;
 				spec.sortValue = 0;
 				returnValues.add(spec);
 			}

 			for (String prenamefileSpec : prenamefileSpecs) {
 				Spec spec = new Spec();
 				spec.name = prenamefileSpec;
 				spec.isPredefined = true;
 				spec.sortValue = 1;
 				returnValues.add(spec);
 			}

 			for (String userextfileSpec : userextfileSpecs) {
 				Spec spec = new Spec();
 				spec.ext = userextfileSpec;
 				spec.isPredefined = false;
 				spec.sortValue = 2;
 				returnValues.add(spec);
 			}

 			for (String preextfileSpec : preextfileSpecs) {
 				Spec spec = new Spec();
 				spec.ext = preextfileSpec;
 				spec.isPredefined = true;
 				spec.sortValue = 3;
 				returnValues.add(spec);
 			}

 			return returnValues.toArray();
 		}
 	}

 	private class ContentTypesLabelProvider extends LabelProvider {
 		@Override
 		public String getText(Object element) {
 			IContentType contentType = (IContentType) element;
 			return contentType.getName();
 		}
 	}

 	private class ContentTypesContentProvider implements ITreeContentProvider {

 		private IContentTypeManager manager;

 		@Override
 		public Object[] getChildren(Object parentElement) {
 			List elements = new ArrayList();
 			IContentType baseType = (IContentType) parentElement;
 			for (IContentType contentType : manager.getAllContentTypes()) {
 				if (Util.equals(contentType.getBaseType(), baseType)) {
 					elements.add(contentType);
 				}
 			}
 			return elements.toArray();
 		}

 		@Override
 		public Object getParent(Object element) {
 			IContentType contentType = (IContentType) element;
 			return contentType.getBaseType();
 		}

 		@Override
 		public boolean hasChildren(Object element) {
 			return getChildren(element).length > 0;
 		}

 		@Override
 		public Object[] getElements(Object inputElement) {
 			return getChildren(null);
 		}

 		@Override
 		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
 			manager = (IContentTypeManager) newInput;
 		}
 	}

 	@Override
 	protected Control createContents(Composite parent) {
 		Composite composite = new Composite(parent, SWT.NONE);
 		GridLayout layout = new GridLayout(2, false);
 		layout.marginHeight = layout.marginWidth = 0;
 		composite.setLayout(layout);

 		PreferenceLinkArea contentTypeArea = new PreferenceLinkArea(
 				composite,
 				SWT.NONE,
 				"org.eclipse.ui.preferencePages.FileEditors", WorkbenchMessages.ContentTypes_FileEditorsRelatedLink,//$NON-NLS-1$
 				(IWorkbenchPreferenceContainer) getContainer(), null);

 		GridData data = new GridData(GridData.FILL_HORIZONTAL
 				| GridData.GRAB_HORIZONTAL);
 		contentTypeArea.getControl().setLayoutData(data);

 		createContentTypesTree(composite);
 		createFileAssociations(composite);
 		createCharset(composite);

 		workbench.getHelpSystem().setHelp(parent,
 				IWorkbenchHelpContextIds.CONTENT_TYPES_PREFERENCE_PAGE);

 		applyDialogFont(composite);
 		return composite;
 	}

 	private void createCharset(final Composite parent) {
 		Composite composite = new Composite(parent, SWT.NONE);
 		GridLayout layout = new GridLayout(3, false);
 		layout.marginHeight = layout.marginWidth = 0;
 		GridData compositeData = new GridData(GridData.FILL_HORIZONTAL);
 		compositeData.horizontalSpan = 2;
 		composite.setLayoutData(compositeData);
 		composite.setLayout(layout);

 		Label label = new Label(composite, SWT.NONE);
 		label.setFont(parent.getFont());
 		label.setText(WorkbenchMessages.ContentTypes_characterSetLabel);
 		charsetField = new Text(composite, SWT.SINGLE | SWT.BORDER);
 		charsetField.setFont(parent.getFont());
 		charsetField.setEnabled(false);
 		GridData data = new GridData(GridData.FILL_HORIZONTAL);
 		charsetField.setLayoutData(data);
 		setButton = new Button(composite, SWT.PUSH);
 		setButton.setFont(parent.getFont());
 		setButton
 				.setText(WorkbenchMessages.ContentTypes_characterSetUpdateLabel);
 		setButton.setEnabled(false);
 		setButtonLayoutData(setButton);
 		setButton.addSelectionListener(widgetSelectedAdapter(e -> {
 			try {
 				String text = charsetField.getText().trim();
 				if (text.length() == 0) {
 					text = null;
 				}
 				getSelectedContentType().setDefaultCharset(text);
 				setButton.setEnabled(false);
 			} catch (CoreException e1) {
 				StatusUtil.handleStatus(e1.getStatus(), StatusManager.SHOW,
 						parent.getShell());
 			}
 		}));

 		charsetField.addKeyListener(new KeyAdapter() {
 			@Override
 			public void keyReleased(KeyEvent e) {
 				IContentType contentType = getSelectedContentType();
 				String charset = contentType.getDefaultCharset();
 				if (charset == null) {
 					charset = ""; //$NON-NLS-1$
 				}
 				setButton.setEnabled(!charset.equals(charsetField.getText())
 						&& getErrorMessage() == null);
 			}
 		});

 		charsetField.addModifyListener(e -> {
 			String errorMessage = null;
 			String text = charsetField.getText();
 			try {
 				if (text.length() != 0 && !Charset.isSupported(text))
 					errorMessage = WorkbenchMessages.ContentTypes_unsupportedEncoding;
 			} catch (IllegalCharsetNameException ex) {
 				errorMessage = WorkbenchMessages.ContentTypes_unsupportedEncoding;
 			}
 			setErrorMessage(errorMessage);
 		});

 	}

 	/**
 	 * @param composite
 	 */
 	private void createFileAssociations(final Composite composite) {
 		{
 			Label label = new Label(composite, SWT.NONE);
 			label.setText(WorkbenchMessages.ContentTypes_fileAssociationsLabel);
 			GridData data = new GridData();
 			data.horizontalSpan = 2;
 			label.setLayoutData(data);
 		}
 		{
 			fileAssociationViewer = new ListViewer(composite);
 			fileAssociationViewer.setComparator(new FileSpecComparator());
 			fileAssociationViewer.getControl().setFont(composite.getFont());
 			fileAssociationViewer
 					.setContentProvider(new FileSpecContentProvider());
 			fileAssociationViewer.setLabelProvider(new FileSpecLabelProvider());
 			GridData data = new GridData(GridData.FILL_BOTH);
 			data.horizontalSpan = 1;
 			fileAssociationViewer.getControl().setLayoutData(data);
 			fileAssociationViewer
 					.addSelectionChangedListener(event -> {
 						IStructuredSelection selection = (IStructuredSelection) event
 								.getSelection();
 						if (selection.isEmpty()) {
 							editButton.setEnabled(false);
 							removeButton.setEnabled(false);
 							return;
 						}
 						boolean enabled = true;
 						List elements = selection.toList();
 						for (Iterator i = elements.iterator(); i.hasNext();) {
 							Spec spec = (Spec) i.next();
 							if (spec.isPredefined) {
 								enabled = false;
 							}
 						}
 						editButton.setEnabled(enabled && selection.size() == 1);
 						removeButton.setEnabled(enabled);
 					});
 		}
 		{
 			Composite buttonArea = new Composite(composite, SWT.NONE);
 			GridLayout layout = new GridLayout(1, false);
 			buttonArea.setLayout(layout);
 			GridData data = new GridData(SWT.DEFAULT, SWT.TOP, false, false);
 			buttonArea.setLayoutData(data);

 			addButton = new Button(buttonArea, SWT.PUSH);
 			addButton.setFont(composite.getFont());
 			addButton
 					.setText(WorkbenchMessages.ContentTypes_fileAssociationsAddLabel);
 			addButton.setEnabled(false);
 			setButtonLayoutData(addButton);
 			addButton.addSelectionListener(widgetSelectedAdapter(e -> {
 				Shell shell = composite.getShell();
 				IContentType selectedContentType = getSelectedContentType();
 				FileExtensionDialog dialog = new FileExtensionDialog(
 						shell,
 						WorkbenchMessages.ContentTypes_addDialog_title,
 						IWorkbenchHelpContextIds.FILE_EXTENSION_DIALOG,
 						WorkbenchMessages.ContentTypes_addDialog_messageHeader,
 						WorkbenchMessages.ContentTypes_addDialog_message,
 						WorkbenchMessages.ContentTypes_addDialog_label);
 				if (dialog.open() == Window.OK) {
 					String name = dialog.getName();
 					String extension = dialog.getExtension();
 					try {
 						if (name.equals("*")) { //$NON-NLS-1$
 							selectedContentType.addFileSpec(extension,
 									IContentType.FILE_EXTENSION_SPEC);
 						} else {
 							selectedContentType
 									.addFileSpec(
 											name
 													+ (extension.length() > 0 ? ('.' + extension)
 															: ""), //$NON-NLS-1$
 											IContentType.FILE_NAME_SPEC);
 						}
 					} catch (CoreException ex) {
 						StatusUtil.handleStatus(ex.getStatus(),
 								StatusManager.SHOW, shell);
 						WorkbenchPlugin.log(ex);
 					} finally {
 						fileAssociationViewer.refresh(false);
 					}
 				}
 			}));

 			editButton = new Button(buttonArea, SWT.PUSH);
 			editButton.setFont(composite.getFont());
 			editButton
 					.setText(WorkbenchMessages.ContentTypes_fileAssociationsEditLabel);
 			editButton.setEnabled(false);
 			setButtonLayoutData(editButton);
 			editButton.addSelectionListener(widgetSelectedAdapter(e -> {
 				Shell shell = composite.getShell();
 				IContentType selectedContentType = getSelectedContentType();
 				Spec spec = getSelectedSpecs()[0];
 				FileExtensionDialog dialog = new FileExtensionDialog(
 						shell,
 						WorkbenchMessages.ContentTypes_editDialog_title,
 						IWorkbenchHelpContextIds.FILE_EXTENSION_DIALOG,
 						WorkbenchMessages.ContentTypes_editDialog_messageHeader,
 						WorkbenchMessages.ContentTypes_editDialog_message,
 						WorkbenchMessages.ContentTypes_editDialog_label);
 				if (spec.name == null) {
 					dialog.setInitialValue("*." + spec.ext); //$NON-NLS-1$
 				} else {
 					dialog.setInitialValue(spec.name);
 				}
 				if (dialog.open() == Window.OK) {
 					String name = dialog.getName();
 					String extension = dialog.getExtension();
 					try {
 						// remove the original spec
 						if (spec.name != null) {
 							selectedContentType.removeFileSpec(spec.name,
 									IContentType.FILE_NAME_SPEC);
 						} else if (spec.ext != null) {
 							selectedContentType.removeFileSpec(spec.ext,
 									IContentType.FILE_EXTENSION_SPEC);
 						}

 						// add the new one
 						if (name.equals("*")) { //$NON-NLS-1$
 							selectedContentType.addFileSpec(extension,
 									IContentType.FILE_EXTENSION_SPEC);
 						} else {
 							selectedContentType
 									.addFileSpec(
 											name
 													+ (extension.length() > 0 ? ('.' + extension)
 															: ""), //$NON-NLS-1$
 											IContentType.FILE_NAME_SPEC);
 						}
 					} catch (CoreException ex) {
 						StatusUtil.handleStatus(ex.getStatus(),
 								StatusManager.SHOW, shell);
 						WorkbenchPlugin.log(ex);
 					} finally {
 						fileAssociationViewer.refresh(false);
 					}
 				}
 			}));

 			removeButton = new Button(buttonArea, SWT.PUSH);
 			removeButton.setEnabled(false);
 			removeButton
 					.setText(WorkbenchMessages.ContentTypes_fileAssociationsRemoveLabel);
 			setButtonLayoutData(removeButton);
 			removeButton.addSelectionListener(widgetSelectedAdapter(event -> {
 				IContentType contentType = getSelectedContentType();
 				Spec[] specs = getSelectedSpecs();
 				MultiStatus result = new MultiStatus(PlatformUI.PLUGIN_ID,
 						0, new IStatus[0],
 						WorkbenchMessages.ContentTypes_errorDialogMessage,
 						null);
 				for (Spec spec : specs) {
 					try {
 						if (spec.name != null) {
 							contentType.removeFileSpec(spec.name,
 									IContentType.FILE_NAME_SPEC);
 						} else if (spec.ext != null) {
 							contentType.removeFileSpec(spec.ext,
 									IContentType.FILE_EXTENSION_SPEC);
 						}
 					} catch (CoreException e) {
 						result.add(e.getStatus());
 					}
 				}
 				if (!result.isOK()) {
 					StatusUtil.handleStatus(result, StatusManager.SHOW,
 							composite.getShell());
 				}
 				fileAssociationViewer.refresh(false);
 			}));
 		}
 	}

 	protected Spec[] getSelectedSpecs() {
 		List list = ((IStructuredSelection) fileAssociationViewer
 				.getSelection()).toList();
 		return (Spec[]) list.toArray(new Spec[list.size()]);
 	}

 	protected IContentType getSelectedContentType() {
 		return (IContentType) ((IStructuredSelection) contentTypesViewer
 				.getSelection()).getFirstElement();
 	}

 	/**
 	 * @param composite
 	 */
 	private void createContentTypesTree(Composite composite) {
 		{
 			Label label = new Label(composite, SWT.NONE);
 			label.setFont(composite.getFont());
 			label.setText(WorkbenchMessages.ContentTypes_contentTypesLabel);
 			GridData data = new GridData();
 			data.horizontalSpan = 2;
 			label.setLayoutData(data);
 		}
 		{
 			contentTypesViewer = new TreeViewer(composite, SWT.SINGLE
 					| SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
 			contentTypesViewer.getControl().setFont(composite.getFont());
 			contentTypesViewer
 					.setContentProvider(new ContentTypesContentProvider());
 			contentTypesViewer
 					.setLabelProvider(new ContentTypesLabelProvider());
 			contentTypesViewer.setComparator(new ViewerComparator());
 			contentTypesViewer.setInput(Platform.getContentTypeManager());
 			GridData data = new GridData(GridData.FILL_BOTH);
 			contentTypesViewer.getControl().setLayoutData(data);

 			contentTypesViewer
 					.addSelectionChangedListener(event -> {
 						IContentType contentType = (IContentType) ((IStructuredSelection) event
 								.getSelection()).getFirstElement();
 						fileAssociationViewer.setInput(contentType);
 						editButton.setEnabled(false);
 						removeButton.setEnabled(false);

 						if (contentType != null) {
 							String charset = contentType
 									.getDefaultCharset();
 							if (charset == null) {
 								charset = ""; //$NON-NLS-1$
 							}
 							charsetField.setText(charset);
 						} else {
 							charsetField.setText(""); //$NON-NLS-1$
 						}

 						charsetField.setEnabled(contentType != null);
 						addButton.setEnabled(contentType != null);
 						setButton.setEnabled(false);

 						addChildContentTypeButton.setEnabled(contentType != null);
 						removeContentTypeButton.setEnabled(contentType != null && contentType.isUserDefined());
 					});
 		}
 		Composite buttonsComposite = new Composite(composite, SWT.NONE);
 		buttonsComposite.setLayoutData(new GridData(SWT.DEFAULT, SWT.TOP, false, false));
 		buttonsComposite.setLayout(new GridLayout(1, false));
 		Button addRootContentTypeButton = new Button(buttonsComposite, SWT.PUSH);
 		setButtonLayoutData(addRootContentTypeButton);
 		addRootContentTypeButton.setText(WorkbenchMessages.ContentTypes_addRootContentTypeButton);
 		addRootContentTypeButton.addSelectionListener(widgetSelectedAdapter(e -> {
 			String id = "userCreated" + System.currentTimeMillis(); //$NON-NLS-1$
 			IContentTypeManager manager = (IContentTypeManager) contentTypesViewer.getInput();
 			NewContentTypeDialog dialog = new NewContentTypeDialog(ContentTypesPreferencePage.this.getShell(),
 					manager, null);
 			if (dialog.open() == IDialogConstants.OK_ID) {
 				try {
 					IContentType newContentType = manager.addContentType(id, dialog.getName(), null);
 					contentTypesViewer.refresh();
 					contentTypesViewer.setSelection(new StructuredSelection(newContentType));
 				} catch (CoreException e1) {
 					MessageDialog.openError(getShell(), WorkbenchMessages.ContentTypes_failedAtEditingContentTypes,
 							e1.getMessage());
 				}
 			}
 		}));
 		addChildContentTypeButton = new Button(buttonsComposite, SWT.PUSH);
 		setButtonLayoutData(addChildContentTypeButton);
 		addChildContentTypeButton.setText(WorkbenchMessages.ContentTypes_addChildContentTypeButton);
 		addChildContentTypeButton.addSelectionListener(widgetSelectedAdapter(e -> {
 			String id = "userCreated" + System.currentTimeMillis(); //$NON-NLS-1$
 			IContentTypeManager manager = (IContentTypeManager) contentTypesViewer.getInput();
 			NewContentTypeDialog dialog = new NewContentTypeDialog(ContentTypesPreferencePage.this.getShell(),
 					manager,
 					getSelectedContentType());
 			if (dialog.open() == IDialogConstants.OK_ID) {
 				try {
 					IContentType newContentType = manager.addContentType(id, dialog.getName(),
 							getSelectedContentType());
 					contentTypesViewer.refresh(getSelectedContentType());
 					contentTypesViewer.setSelection(new StructuredSelection(newContentType));
 				} catch (CoreException e1) {
 					MessageDialog.openError(getShell(), WorkbenchMessages.ContentTypes_failedAtEditingContentTypes,
 							e1.getMessage());
 				}
 			}
 		}));
 		addChildContentTypeButton.setEnabled(getSelectedContentType() != null);
 		removeContentTypeButton = new Button(buttonsComposite, SWT.PUSH);
 		setButtonLayoutData(removeContentTypeButton);
 		removeContentTypeButton.setText(WorkbenchMessages.ContentTypes_removeContentTypeButton);
 		removeContentTypeButton.addSelectionListener(widgetSelectedAdapter(e -> {
 			IContentType selectedContentType = getSelectedContentType();
 			try {
 				Platform.getContentTypeManager().removeContentType(selectedContentType.getId());
 				contentTypesViewer.refresh();
 			} catch (CoreException e1) {
 				MessageDialog.openError(getShell(), WorkbenchMessages.ContentTypes_failedAtEditingContentTypes,
 						e1.getMessage());
 			}
 		}));
 		removeContentTypeButton
 				.setEnabled(getSelectedContentType() != null && getSelectedContentType().isUserDefined());
 	}

 	@Override
 	public void init(IWorkbench workbench) {
 		this.workbench = workbench;
 		noDefaultAndApplyButton();
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2005, 2016 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.ui.internal.dialogs;

	import static org.eclipse.swt.events.SelectionListener.widgetSelectedAdapter;

	import java.nio.charset.Charset;
	import java.nio.charset.IllegalCharsetNameException;
	import java.util.ArrayList;
	import java.util.Iterator;
	import java.util.List;
	import org.eclipse.core.runtime.CoreException;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.MultiStatus;
	import org.eclipse.core.runtime.Platform;
	import org.eclipse.core.runtime.content.IContentType;
	import org.eclipse.core.runtime.content.IContentTypeManager;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.dialogs.MessageDialog;
	import org.eclipse.jface.preference.PreferencePage;
	import org.eclipse.jface.viewers.IStructuredContentProvider;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.ITreeContentProvider;
	import org.eclipse.jface.viewers.LabelProvider;
	import org.eclipse.jface.viewers.ListViewer;
	import org.eclipse.jface.viewers.StructuredSelection;
	import org.eclipse.jface.viewers.TreeViewer;
	import org.eclipse.jface.viewers.Viewer;
	import org.eclipse.jface.viewers.ViewerComparator;
	import org.eclipse.jface.window.Window;
	import org.eclipse.osgi.util.NLS;
	import org.eclipse.osgi.util.TextProcessor;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.KeyAdapter;
	import org.eclipse.swt.events.KeyEvent;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.swt.widgets.Text;
	import org.eclipse.ui.IWorkbench;
	import org.eclipse.ui.IWorkbenchPreferencePage;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.dialogs.PreferenceLinkArea;
	import org.eclipse.ui.internal.IWorkbenchHelpContextIds;
	import org.eclipse.ui.internal.WorkbenchMessages;
	import org.eclipse.ui.internal.WorkbenchPlugin;
	import org.eclipse.ui.internal.misc.StatusUtil;
	import org.eclipse.ui.internal.util.Util;
	import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer;
	import org.eclipse.ui.statushandlers.StatusManager;

	/**
	* Preference page that allows manipulation of core content types. Unlike most
	* preference pages, it does not work on the preference store itself but rather
	* the content type manager. As such, there are no apply/default buttons and all
	* changes made take effect immediately.
	*
	* @since 3.1
	*/
	public class ContentTypesPreferencePage extends PreferencePage implements
	IWorkbenchPreferencePage {

	private ListViewer fileAssociationViewer;

	private Button removeButton;

	private TreeViewer contentTypesViewer;

	private Button addButton;

	private Button editButton;

	private Text charsetField;

	private Button setButton;

	private IWorkbench workbench;

	private Button removeContentTypeButton;

	private Button addChildContentTypeButton;

	private class Spec {
	String name;

	String ext;

	boolean isPredefined;

	int sortValue;

	@Override
	public String toString() {
	String toString;
	if (name != null) {
	toString = name;
	} else {
	toString = "*." + ext; //$NON-NLS-1$
	}

	if (isPredefined) {
	toString = NLS.bind(
	WorkbenchMessages.ContentTypes_lockedFormat, toString);
	}

	return toString;
	}
	}

	private class FileSpecComparator extends ViewerComparator {
	@Override
	public int category(Object element) {
	// only Spec objects in here - unchecked cast
	return ((Spec) element).sortValue;
	}
	}

	private class FileSpecLabelProvider extends LabelProvider {
	@Override
	public String getText(Object element) {
	String label = super.getText(element);
	return TextProcessor.process(label, "*."); //$NON-NLS-1$
	}
	}

	private class FileSpecContentProvider implements IStructuredContentProvider {

	@Override
	public Object[] getElements(Object inputElement) {
	IContentType contentType = (IContentType) inputElement;
	String[] userextfileSpecs = contentType
	.getFileSpecs(IContentType.FILE_EXTENSION_SPEC \| IContentType.IGNORE_PRE_DEFINED);
	String[] usernamefileSpecs = contentType
	.getFileSpecs(IContentType.FILE_NAME_SPEC \| IContentType.IGNORE_PRE_DEFINED);
	String[] preextfileSpecs = contentType
	.getFileSpecs(IContentType.FILE_EXTENSION_SPEC \| IContentType.IGNORE_USER_DEFINED);
	String[] prenamefileSpecs = contentType
	.getFileSpecs(IContentType.FILE_NAME_SPEC \| IContentType.IGNORE_USER_DEFINED);

	return createSpecs(userextfileSpecs, usernamefileSpecs,
	preextfileSpecs, prenamefileSpecs);
	}

	private Object[] createSpecs(String[] userextfileSpecs,
	String[] usernamefileSpecs, String[] preextfileSpecs,
	String[] prenamefileSpecs) {
	List returnValues = new ArrayList();
	for (String usernamefileSpec : usernamefileSpecs) {
	Spec spec = new Spec();
	spec.name = usernamefileSpec;
	spec.isPredefined = false;
	spec.sortValue = 0;
	returnValues.add(spec);
	}

	for (String prenamefileSpec : prenamefileSpecs) {
	Spec spec = new Spec();
	spec.name = prenamefileSpec;
	spec.isPredefined = true;
	spec.sortValue = 1;
	returnValues.add(spec);
	}

	for (String userextfileSpec : userextfileSpecs) {
	Spec spec = new Spec();
	spec.ext = userextfileSpec;
	spec.isPredefined = false;
	spec.sortValue = 2;
	returnValues.add(spec);
	}

	for (String preextfileSpec : preextfileSpecs) {
	Spec spec = new Spec();
	spec.ext = preextfileSpec;
	spec.isPredefined = true;
	spec.sortValue = 3;
	returnValues.add(spec);
	}

	return returnValues.toArray();
	}
	}

	private class ContentTypesLabelProvider extends LabelProvider {
	@Override
	public String getText(Object element) {
	IContentType contentType = (IContentType) element;
	return contentType.getName();
	}
	}

	private class ContentTypesContentProvider implements ITreeContentProvider {

	private IContentTypeManager manager;

	@Override
	public Object[] getChildren(Object parentElement) {
	List elements = new ArrayList();
	IContentType baseType = (IContentType) parentElement;
	for (IContentType contentType : manager.getAllContentTypes()) {
	if (Util.equals(contentType.getBaseType(), baseType)) {
	elements.add(contentType);
	}
	}
	return elements.toArray();
	}

	@Override
	public Object getParent(Object element) {
	IContentType contentType = (IContentType) element;
	return contentType.getBaseType();
	}

	@Override
	public boolean hasChildren(Object element) {
	return getChildren(element).length > 0;
	}

	@Override
	public Object[] getElements(Object inputElement) {
	return getChildren(null);
	}

	@Override
	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
	manager = (IContentTypeManager) newInput;
	}
	}

	@Override
	protected Control createContents(Composite parent) {
	Composite composite = new Composite(parent, SWT.NONE);
	GridLayout layout = new GridLayout(2, false);
	layout.marginHeight = layout.marginWidth = 0;
	composite.setLayout(layout);

	PreferenceLinkArea contentTypeArea = new PreferenceLinkArea(
	composite,
	SWT.NONE,
	"org.eclipse.ui.preferencePages.FileEditors", WorkbenchMessages.ContentTypes_FileEditorsRelatedLink,//$NON-NLS-1$
	(IWorkbenchPreferenceContainer) getContainer(), null);

	GridData data = new GridData(GridData.FILL_HORIZONTAL
	\| GridData.GRAB_HORIZONTAL);
	contentTypeArea.getControl().setLayoutData(data);

	createContentTypesTree(composite);
	createFileAssociations(composite);
	createCharset(composite);

	workbench.getHelpSystem().setHelp(parent,
	IWorkbenchHelpContextIds.CONTENT_TYPES_PREFERENCE_PAGE);

	applyDialogFont(composite);
	return composite;
	}

	private void createCharset(final Composite parent) {
	Composite composite = new Composite(parent, SWT.NONE);
	GridLayout layout = new GridLayout(3, false);
	layout.marginHeight = layout.marginWidth = 0;
	GridData compositeData = new GridData(GridData.FILL_HORIZONTAL);
	compositeData.horizontalSpan = 2;
	composite.setLayoutData(compositeData);
	composite.setLayout(layout);

	Label label = new Label(composite, SWT.NONE);
	label.setFont(parent.getFont());
	label.setText(WorkbenchMessages.ContentTypes_characterSetLabel);
	charsetField = new Text(composite, SWT.SINGLE \| SWT.BORDER);
	charsetField.setFont(parent.getFont());
	charsetField.setEnabled(false);
	GridData data = new GridData(GridData.FILL_HORIZONTAL);
	charsetField.setLayoutData(data);
	setButton = new Button(composite, SWT.PUSH);
	setButton.setFont(parent.getFont());
	setButton
	.setText(WorkbenchMessages.ContentTypes_characterSetUpdateLabel);
	setButton.setEnabled(false);
	setButtonLayoutData(setButton);
	setButton.addSelectionListener(widgetSelectedAdapter(e -> {
	try {
	String text = charsetField.getText().trim();
	if (text.length() == 0) {
	text = null;
	}
	getSelectedContentType().setDefaultCharset(text);
	setButton.setEnabled(false);
	} catch (CoreException e1) {
	StatusUtil.handleStatus(e1.getStatus(), StatusManager.SHOW,
	parent.getShell());
	}
	}));

	charsetField.addKeyListener(new KeyAdapter() {
	@Override
	public void keyReleased(KeyEvent e) {
	IContentType contentType = getSelectedContentType();
	String charset = contentType.getDefaultCharset();
	if (charset == null) {
	charset = ""; //$NON-NLS-1$
	}
	setButton.setEnabled(!charset.equals(charsetField.getText())
	&& getErrorMessage() == null);
	}
	});

	charsetField.addModifyListener(e -> {
	String errorMessage = null;
	String text = charsetField.getText();
	try {
	if (text.length() != 0 && !Charset.isSupported(text))
	errorMessage = WorkbenchMessages.ContentTypes_unsupportedEncoding;
	} catch (IllegalCharsetNameException ex) {
	errorMessage = WorkbenchMessages.ContentTypes_unsupportedEncoding;
	}
	setErrorMessage(errorMessage);
	});

	}

	/**
	* @param composite
	*/
	private void createFileAssociations(final Composite composite) {
	{
	Label label = new Label(composite, SWT.NONE);
	label.setText(WorkbenchMessages.ContentTypes_fileAssociationsLabel);
	GridData data = new GridData();
	data.horizontalSpan = 2;
	label.setLayoutData(data);
	}
	{
	fileAssociationViewer = new ListViewer(composite);
	fileAssociationViewer.setComparator(new FileSpecComparator());
	fileAssociationViewer.getControl().setFont(composite.getFont());
	fileAssociationViewer
	.setContentProvider(new FileSpecContentProvider());
	fileAssociationViewer.setLabelProvider(new FileSpecLabelProvider());
	GridData data = new GridData(GridData.FILL_BOTH);
	data.horizontalSpan = 1;
	fileAssociationViewer.getControl().setLayoutData(data);
	fileAssociationViewer
	.addSelectionChangedListener(event -> {
	IStructuredSelection selection = (IStructuredSelection) event
	.getSelection();
	if (selection.isEmpty()) {
	editButton.setEnabled(false);
	removeButton.setEnabled(false);
	return;
	}
	boolean enabled = true;
	List elements = selection.toList();
	for (Iterator i = elements.iterator(); i.hasNext();) {
	Spec spec = (Spec) i.next();
	if (spec.isPredefined) {
	enabled = false;
	}
	}
	editButton.setEnabled(enabled && selection.size() == 1);
	removeButton.setEnabled(enabled);
	});
	}
	{
	Composite buttonArea = new Composite(composite, SWT.NONE);
	GridLayout layout = new GridLayout(1, false);
	buttonArea.setLayout(layout);
	GridData data = new GridData(SWT.DEFAULT, SWT.TOP, false, false);
	buttonArea.setLayoutData(data);

	addButton = new Button(buttonArea, SWT.PUSH);
	addButton.setFont(composite.getFont());
	addButton
	.setText(WorkbenchMessages.ContentTypes_fileAssociationsAddLabel);
	addButton.setEnabled(false);
	setButtonLayoutData(addButton);
	addButton.addSelectionListener(widgetSelectedAdapter(e -> {
	Shell shell = composite.getShell();
	IContentType selectedContentType = getSelectedContentType();
	FileExtensionDialog dialog = new FileExtensionDialog(
	shell,
	WorkbenchMessages.ContentTypes_addDialog_title,
	IWorkbenchHelpContextIds.FILE_EXTENSION_DIALOG,
	WorkbenchMessages.ContentTypes_addDialog_messageHeader,
	WorkbenchMessages.ContentTypes_addDialog_message,
	WorkbenchMessages.ContentTypes_addDialog_label);
	if (dialog.open() == Window.OK) {
	String name = dialog.getName();
	String extension = dialog.getExtension();
	try {
	if (name.equals("*")) { //$NON-NLS-1$
	selectedContentType.addFileSpec(extension,
	IContentType.FILE_EXTENSION_SPEC);
	} else {
	selectedContentType
	.addFileSpec(
	name
	+ (extension.length() > 0 ? ('.' + extension)
	: ""), //$NON-NLS-1$
	IContentType.FILE_NAME_SPEC);
	}
	} catch (CoreException ex) {
	StatusUtil.handleStatus(ex.getStatus(),
	StatusManager.SHOW, shell);
	WorkbenchPlugin.log(ex);
	} finally {
	fileAssociationViewer.refresh(false);
	}
	}
	}));

	editButton = new Button(buttonArea, SWT.PUSH);
	editButton.setFont(composite.getFont());
	editButton
	.setText(WorkbenchMessages.ContentTypes_fileAssociationsEditLabel);
	editButton.setEnabled(false);
	setButtonLayoutData(editButton);
	editButton.addSelectionListener(widgetSelectedAdapter(e -> {
	Shell shell = composite.getShell();
	IContentType selectedContentType = getSelectedContentType();
	Spec spec = getSelectedSpecs()[0];
	FileExtensionDialog dialog = new FileExtensionDialog(
	shell,
	WorkbenchMessages.ContentTypes_editDialog_title,
	IWorkbenchHelpContextIds.FILE_EXTENSION_DIALOG,
	WorkbenchMessages.ContentTypes_editDialog_messageHeader,
	WorkbenchMessages.ContentTypes_editDialog_message,
	WorkbenchMessages.ContentTypes_editDialog_label);
	if (spec.name == null) {
	dialog.setInitialValue("*." + spec.ext); //$NON-NLS-1$
	} else {
	dialog.setInitialValue(spec.name);
	}
	if (dialog.open() == Window.OK) {
	String name = dialog.getName();
	String extension = dialog.getExtension();
	try {
	// remove the original spec
	if (spec.name != null) {
	selectedContentType.removeFileSpec(spec.name,
	IContentType.FILE_NAME_SPEC);
	} else if (spec.ext != null) {
	selectedContentType.removeFileSpec(spec.ext,
	IContentType.FILE_EXTENSION_SPEC);
	}

	// add the new one
	if (name.equals("*")) { //$NON-NLS-1$
	selectedContentType.addFileSpec(extension,
	IContentType.FILE_EXTENSION_SPEC);
	} else {
	selectedContentType
	.addFileSpec(
	name
	+ (extension.length() > 0 ? ('.' + extension)
	: ""), //$NON-NLS-1$
	IContentType.FILE_NAME_SPEC);
	}
	} catch (CoreException ex) {
	StatusUtil.handleStatus(ex.getStatus(),
	StatusManager.SHOW, shell);
	WorkbenchPlugin.log(ex);
	} finally {
	fileAssociationViewer.refresh(false);
	}
	}
	}));

	removeButton = new Button(buttonArea, SWT.PUSH);
	removeButton.setEnabled(false);
	removeButton
	.setText(WorkbenchMessages.ContentTypes_fileAssociationsRemoveLabel);
	setButtonLayoutData(removeButton);
	removeButton.addSelectionListener(widgetSelectedAdapter(event -> {
	IContentType contentType = getSelectedContentType();
	Spec[] specs = getSelectedSpecs();
	MultiStatus result = new MultiStatus(PlatformUI.PLUGIN_ID,
	0, new IStatus[0],
	WorkbenchMessages.ContentTypes_errorDialogMessage,
	null);
	for (Spec spec : specs) {
	try {
	if (spec.name != null) {
	contentType.removeFileSpec(spec.name,
	IContentType.FILE_NAME_SPEC);
	} else if (spec.ext != null) {
	contentType.removeFileSpec(spec.ext,
	IContentType.FILE_EXTENSION_SPEC);
	}
	} catch (CoreException e) {
	result.add(e.getStatus());
	}
	}
	if (!result.isOK()) {
	StatusUtil.handleStatus(result, StatusManager.SHOW,
	composite.getShell());
	}
	fileAssociationViewer.refresh(false);
	}));
	}
	}

	protected Spec[] getSelectedSpecs() {
	List list = ((IStructuredSelection) fileAssociationViewer
	.getSelection()).toList();
	return (Spec[]) list.toArray(new Spec[list.size()]);
	}

	protected IContentType getSelectedContentType() {
	return (IContentType) ((IStructuredSelection) contentTypesViewer
	.getSelection()).getFirstElement();
	}

	/**
	* @param composite
	*/
	private void createContentTypesTree(Composite composite) {
	{
	Label label = new Label(composite, SWT.NONE);
	label.setFont(composite.getFont());
	label.setText(WorkbenchMessages.ContentTypes_contentTypesLabel);
	GridData data = new GridData();
	data.horizontalSpan = 2;
	label.setLayoutData(data);
	}
	{
	contentTypesViewer = new TreeViewer(composite, SWT.SINGLE
	\| SWT.H_SCROLL \| SWT.V_SCROLL \| SWT.BORDER);
	contentTypesViewer.getControl().setFont(composite.getFont());
	contentTypesViewer
	.setContentProvider(new ContentTypesContentProvider());
	contentTypesViewer
	.setLabelProvider(new ContentTypesLabelProvider());
	contentTypesViewer.setComparator(new ViewerComparator());
	contentTypesViewer.setInput(Platform.getContentTypeManager());
	GridData data = new GridData(GridData.FILL_BOTH);
	contentTypesViewer.getControl().setLayoutData(data);

	contentTypesViewer
	.addSelectionChangedListener(event -> {
	IContentType contentType = (IContentType) ((IStructuredSelection) event
	.getSelection()).getFirstElement();
	fileAssociationViewer.setInput(contentType);
	editButton.setEnabled(false);
	removeButton.setEnabled(false);

	if (contentType != null) {
	String charset = contentType
	.getDefaultCharset();
	if (charset == null) {
	charset = ""; //$NON-NLS-1$
	}
	charsetField.setText(charset);
	} else {
	charsetField.setText(""); //$NON-NLS-1$
	}

	charsetField.setEnabled(contentType != null);
	addButton.setEnabled(contentType != null);
	setButton.setEnabled(false);

	addChildContentTypeButton.setEnabled(contentType != null);
	removeContentTypeButton.setEnabled(contentType != null && contentType.isUserDefined());
	});
	}
	Composite buttonsComposite = new Composite(composite, SWT.NONE);
	buttonsComposite.setLayoutData(new GridData(SWT.DEFAULT, SWT.TOP, false, false));
	buttonsComposite.setLayout(new GridLayout(1, false));
	Button addRootContentTypeButton = new Button(buttonsComposite, SWT.PUSH);
	setButtonLayoutData(addRootContentTypeButton);
	addRootContentTypeButton.setText(WorkbenchMessages.ContentTypes_addRootContentTypeButton);
	addRootContentTypeButton.addSelectionListener(widgetSelectedAdapter(e -> {
	String id = "userCreated" + System.currentTimeMillis(); //$NON-NLS-1$
	IContentTypeManager manager = (IContentTypeManager) contentTypesViewer.getInput();
	NewContentTypeDialog dialog = new NewContentTypeDialog(ContentTypesPreferencePage.this.getShell(),
	manager, null);
	if (dialog.open() == IDialogConstants.OK_ID) {
	try {
	IContentType newContentType = manager.addContentType(id, dialog.getName(), null);
	contentTypesViewer.refresh();
	contentTypesViewer.setSelection(new StructuredSelection(newContentType));
	} catch (CoreException e1) {
	MessageDialog.openError(getShell(), WorkbenchMessages.ContentTypes_failedAtEditingContentTypes,
	e1.getMessage());
	}
	}
	}));
	addChildContentTypeButton = new Button(buttonsComposite, SWT.PUSH);
	setButtonLayoutData(addChildContentTypeButton);
	addChildContentTypeButton.setText(WorkbenchMessages.ContentTypes_addChildContentTypeButton);
	addChildContentTypeButton.addSelectionListener(widgetSelectedAdapter(e -> {
	String id = "userCreated" + System.currentTimeMillis(); //$NON-NLS-1$
	IContentTypeManager manager = (IContentTypeManager) contentTypesViewer.getInput();
	NewContentTypeDialog dialog = new NewContentTypeDialog(ContentTypesPreferencePage.this.getShell(),
	manager,
	getSelectedContentType());
	if (dialog.open() == IDialogConstants.OK_ID) {
	try {
	IContentType newContentType = manager.addContentType(id, dialog.getName(),
	getSelectedContentType());
	contentTypesViewer.refresh(getSelectedContentType());
	contentTypesViewer.setSelection(new StructuredSelection(newContentType));
	} catch (CoreException e1) {
	MessageDialog.openError(getShell(), WorkbenchMessages.ContentTypes_failedAtEditingContentTypes,
	e1.getMessage());
	}
	}
	}));
	addChildContentTypeButton.setEnabled(getSelectedContentType() != null);
	removeContentTypeButton = new Button(buttonsComposite, SWT.PUSH);
	setButtonLayoutData(removeContentTypeButton);
	removeContentTypeButton.setText(WorkbenchMessages.ContentTypes_removeContentTypeButton);
	removeContentTypeButton.addSelectionListener(widgetSelectedAdapter(e -> {
	IContentType selectedContentType = getSelectedContentType();
	try {
	Platform.getContentTypeManager().removeContentType(selectedContentType.getId());
	contentTypesViewer.refresh();
	} catch (CoreException e1) {
	MessageDialog.openError(getShell(), WorkbenchMessages.ContentTypes_failedAtEditingContentTypes,
	e1.getMessage());
	}
	}));
	removeContentTypeButton
	.setEnabled(getSelectedContentType() != null && getSelectedContentType().isUserDefined());
	}

	@Override
	public void init(IWorkbench workbench) {
	this.workbench = workbench;
	noDefaultAndApplyButton();
	}
	}