org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/preferences/launch/MavenInstallationWizardPage.java - gerrit/m2e/m2e-core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2014 Takari, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  *      Takari, Inc. - initial API and implementation
  *******************************************************************************/

 package org.eclipse.m2e.core.ui.internal.preferences.launch;

 import java.io.File;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Set;

 import org.eclipse.core.resources.IProject;
 import org.eclipse.jface.viewers.ILabelProvider;
 import org.eclipse.jface.viewers.ILabelProviderListener;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.ITreeContentProvider;
 import org.eclipse.jface.viewers.TreeViewer;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.jface.window.Window;
 import org.eclipse.jface.wizard.WizardPage;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.layout.RowLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.DirectoryDialog;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.swt.widgets.Tree;
 import org.eclipse.ui.dialogs.ElementListSelectionDialog;

 import org.eclipse.m2e.core.MavenPlugin;
 import org.eclipse.m2e.core.internal.launch.AbstractMavenRuntime;
 import org.eclipse.m2e.core.internal.launch.ClasspathEntry;
 import org.eclipse.m2e.core.internal.launch.MavenExternalRuntime;
 import org.eclipse.m2e.core.internal.launch.MavenWorkspaceRuntime;
 import org.eclipse.m2e.core.internal.launch.ProjectClasspathEntry;
 import org.eclipse.m2e.core.project.IMavenProjectFacade;
 import org.eclipse.m2e.core.ui.internal.Messages;
 import org.eclipse.m2e.core.ui.internal.components.MavenProjectLabelProvider;


 @SuppressWarnings("restriction")
 public class MavenInstallationWizardPage extends WizardPage {

   private List<ClasspathEntry> extensions;

   private Text location;

   private Button btnAddProject;

   private Button btnRemove;

   private Button btnUp;

   private Button btnDown;

   private TreeViewer treeViewerLibrariries;

   private Text name;

   private AbstractMavenRuntime original;

   private Button btnExternal;

   private Button btnWorkspace;

   private Button btnDirectory;

   private Set<String> usedNames;

   class TreeContentProvider implements ITreeContentProvider {

     public void dispose() {
     }

     public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
     }

     public Object[] getElements(Object inputElement) {
       return ((Collection<?>) inputElement).toArray();
     }

     public Object[] getChildren(Object parentElement) {
       return null;
     }

     public Object getParent(Object element) {
       return null;
     }

     public boolean hasChildren(Object element) {
       return false;
     }

   }

   class TreeLabelProvider implements ILabelProvider {

     public void addListener(ILabelProviderListener listener) {
     }

     public void dispose() {
     }

     public boolean isLabelProperty(Object element, String property) {
       return false;
     }

     public void removeListener(ILabelProviderListener listener) {
     }

     public Image getImage(Object element) {
       return null;
     }

     public String getText(Object element) {
       if(element instanceof ProjectClasspathEntry) {
         return ((ProjectClasspathEntry) element).getProject();
       }
       return element.toString();
     }
   }

   public MavenInstallationWizardPage(AbstractMavenRuntime original, Set<String> usedNames) {
     super(Messages.ExternalInstallPage_pageName);
     this.original = original;
     this.usedNames = usedNames;
     setDescription(Messages.ExternalInstallPage_description);

     this.extensions = original != null && original.getExtensions() != null ? original.getExtensions()
         : new ArrayList<ClasspathEntry>();
   }

   public void createControl(Composite parent) {
     Composite container = new Composite(parent, SWT.NULL);

     setControl(container);
     container.setLayout(new GridLayout(3, false));

     Label lblInstallationType = new Label(container, SWT.NONE);
     lblInstallationType.setText(Messages.MavenInstallationWizardPage_lblInstallationType_text);

     Composite composite = new Composite(container, SWT.NONE);
     RowLayout rl_composite = new RowLayout(SWT.HORIZONTAL);
     rl_composite.fill = true;
     composite.setLayout(rl_composite);
     composite.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 2, 1));

     btnExternal = new Button(composite, SWT.RADIO);
     btnExternal.addSelectionListener(new SelectionAdapter() {
       @Override
       public void widgetSelected(SelectionEvent e) {
         changeRuntimeTypeAction();
       }
     });
     btnExternal.setText(Messages.MavenInstallationWizardPage_btnExternal_text_1);

     btnWorkspace = new Button(composite, SWT.RADIO);
     btnWorkspace.setText(Messages.MavenInstallationWizardPage_btnWorkspace_text);

     Label lblInstallationLocation = new Label(container, SWT.NONE);
     lblInstallationLocation.setText(Messages.ExternalInstallPage_lblInstallationLocation_text);

     location = new Text(container, SWT.BORDER);
     location.addModifyListener(e -> updateStatus());
     location.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));

     btnDirectory = new Button(container, SWT.NONE);
     btnDirectory.addSelectionListener(new SelectionAdapter() {
       @Override
       public void widgetSelected(SelectionEvent e) {
         selectLocationAction();
       }
     });
     btnDirectory.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
     btnDirectory.setText(Messages.ExternalInstallPage_btnDirectory_text);

     Label lblInstallationName = new Label(container, SWT.NONE);
     lblInstallationName.setText(Messages.ExternalInstallPage_lblInstallationName_text);

     name = new Text(container, SWT.BORDER);
     name.addModifyListener(e -> updateStatus());
     name.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));

     Label lblInstallationLibraries = new Label(container, SWT.NONE);
     lblInstallationLibraries.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, false, false, 3, 1));
     lblInstallationLibraries.setText(Messages.ExternalInstallPage_lblInstallationLibraries_text);

     treeViewerLibrariries = new TreeViewer(container, SWT.BORDER);
     treeViewerLibrariries.addSelectionChangedListener(event -> updateButtonsState());
     treeViewerLibrariries.setContentProvider(new TreeContentProvider());
     treeViewerLibrariries.setLabelProvider(new TreeLabelProvider());
     treeViewerLibrariries.setInput(extensions);
     Tree treeLibraries = treeViewerLibrariries.getTree();
     treeLibraries.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 5));

     btnAddProject = new Button(container, SWT.NONE);
     btnAddProject.addSelectionListener(new SelectionAdapter() {
       @Override
       public void widgetSelected(SelectionEvent e) {
         addProjectExtensionAction();
       }
     });
     btnAddProject.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
     btnAddProject.setText(Messages.ExternalInstallPage_btnAddProject_text);

     btnRemove = new Button(container, SWT.NONE);
     btnRemove.addSelectionListener(new SelectionAdapter() {
       @Override
       public void widgetSelected(SelectionEvent e) {
         removeExtensionAction();
       }
     });
     btnRemove.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
     btnRemove.setText(Messages.ExternalInstallPage_btnRemove_text);

     btnUp = new Button(container, SWT.NONE);
     btnUp.addSelectionListener(new SelectionAdapter() {
       @Override
       public void widgetSelected(SelectionEvent e) {
         moveExtensionAction(-1);
       }
     });
     btnUp.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
     btnUp.setText(Messages.ExternalInstallPage_btnUp_text);

     btnDown = new Button(container, SWT.NONE);
     btnDown.addSelectionListener(new SelectionAdapter() {
       @Override
       public void widgetSelected(SelectionEvent e) {
         moveExtensionAction(1);
       }
     });
     btnDown.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
     btnDown.setText(Messages.ExternalInstallPage_btnDown_text);

     Button btnRestoreDefault = new Button(container, SWT.NONE);
     btnRestoreDefault.addSelectionListener(new SelectionAdapter() {
       @Override
       public void widgetSelected(SelectionEvent e) {
         resetExtensionsAction();
       }
     });
     btnRestoreDefault.setLayoutData(new GridData(SWT.FILL, SWT.BOTTOM, false, false, 1, 1));
     btnRestoreDefault.setText(Messages.ExternalInstallPage_btnRestoreDefault_text);

     if(original instanceof MavenExternalRuntime) {
       btnExternal.setSelection(true);
       location.setText(original.getLocation());
       if(!original.isLegacy()) {
         name.setText(original.getName());
       }
     }
     if(original instanceof MavenWorkspaceRuntime) {
       btnWorkspace.setSelection(true);
       name.setText(original.getName());
     } else {
       btnWorkspace.setEnabled(new MavenWorkspaceRuntime("test").isAvailable()); //$NON-NLS-1$
     }
     if(original == null) {
       btnExternal.setSelection(true);
     }

     updateButtonsState();
     updateStatus();
   }

   protected void changeRuntimeTypeAction() {
     location.setEnabled(btnExternal.getSelection());
     btnDirectory.setEnabled(btnExternal.getSelection());
     updateStatus();
   }

   protected void moveExtensionAction(int offset) {
     int from = extensions.indexOf(getSelectedElement());
     int to = Math.min(extensions.size() - 1, Math.max(0, from + offset));
     Collections.swap(extensions, from, to);
     treeViewerLibrariries.refresh();
   }

   protected void resetExtensionsAction() {
     extensions.clear();
     treeViewerLibrariries.refresh();
   }

   protected void removeExtensionAction() {
     Object selection = getSelectedElement();
     extensions.remove(selection);
     treeViewerLibrariries.refresh();
   }

   protected void updateButtonsState() {
     Object selection = getSelectedElement();

     // can move/remove classpath entries only
     boolean editEnabled = selection != null;
     btnUp.setEnabled(editEnabled);
     btnDown.setEnabled(editEnabled);
     btnRemove.setEnabled(editEnabled);
   }

   private Object getSelectedElement() {
     return ((IStructuredSelection) treeViewerLibrariries.getSelection()).getFirstElement();
   }

   protected void addProjectExtensionAction() {
     List<IProject> projects = new ArrayList<IProject>();
     for(IMavenProjectFacade facade : MavenPlugin.getMavenProjectRegistry().getProjects()) {
       IProject project = facade.getProject();
       if(!contains(extensions, project)) {
         projects.add(project);
       }
     }
     Collections.sort(projects, (p1, p2) -> p1.getName().compareTo(p2.getName()));
     ElementListSelectionDialog dialog = new ElementListSelectionDialog(getShell(), new MavenProjectLabelProvider());
     dialog.setElements(projects.toArray());
     dialog.setMessage(Messages.MavenInstallationWizardPage_selectProjectMessage);
     dialog.setTitle(Messages.MavenInstallationWizardPage_selectProjectTitle);
     dialog.setHelpAvailable(false);
     dialog.setMultipleSelection(true);
     if(dialog.open() == Window.OK) {
       Object insertionPoint = getSelectedElement();
       if(insertionPoint == null || insertionPoint instanceof ClasspathEntry) {
         int idx = Math.max(0, extensions.indexOf(insertionPoint));
         for(Object object : dialog.getResult()) {
           extensions.add(idx, new ProjectClasspathEntry(((IProject) object).getName()));
         }
       } else {
         throw new IllegalStateException();
       }
       treeViewerLibrariries.refresh();
     }
   }

   protected boolean contains(List<ClasspathEntry> entries, IProject project) {
     for(ClasspathEntry entry : entries) {
       if(entry instanceof ProjectClasspathEntry
           && ((ProjectClasspathEntry) entry).getProject().equals(project.getName())) {
         return true;
       }
     }
     return false;
   }

   protected void selectLocationAction() {
     DirectoryDialog dlg = new DirectoryDialog(getShell());
     dlg.setText(Messages.MavenInstallationsPreferencePage_dialog_install_title);
     dlg.setMessage(Messages.MavenInstallationsPreferencePage_dialog_install_message);
     String dir = dlg.open();
     if(dir == null) {
       return;
     }
     location.setText(dir);
     if(name.getText().trim().isEmpty()) {
       name.setText(new File(dir).getName());
     }
   }

   private boolean isValidMavenInstall(String dir) {
     if(dir == null || dir.length() == 0) {
       return false;
     }
     File selectedDir = new File(dir);
     if(!selectedDir.isDirectory()) {
       return false;
     }
     return new MavenExternalRuntime(dir).isAvailable();
   }

   protected void updateStatus() {
     setPageComplete(false);
     setMessage(null);
     setErrorMessage(null);

     if(btnExternal.getSelection()) {
       if(location.getText().trim().isEmpty()) {
         setMessage(Messages.MavenInstallationWizardPage_messageSelectHomeDirectory);
         return;
       }

       if(!isValidMavenInstall(location.getText())) {
         setErrorMessage(Messages.MavenInstallationWizardPage_messageHomeDirectoryIsNotMavenInstll);
         return;
       }
     }

     if(name.getText().trim().isEmpty()) {
       setMessage(Messages.MavenInstallationWizardPage_messageSelectInstallatonName);
       return;
     }

     if(usedNames.contains(name.getText().trim())) {
       setErrorMessage(Messages.MavenInstallationWizardPage_messageDuplicateInstallationName);
       return;
     }

     setPageComplete(true);
   }

   public AbstractMavenRuntime getResult() {
     AbstractMavenRuntime runtime;
     if(btnExternal.getSelection()) {
       runtime = new MavenExternalRuntime(name.getText(), location.getText());
     } else {
       runtime = new MavenWorkspaceRuntime(name.getText());
     }
     runtime.setExtensions(extensions);
     return runtime;
   }
 }
	/*******************************************************************************
	* Copyright (c) 2014 Takari, Inc.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License 2.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* Takari, Inc. - initial API and implementation
	*******************************************************************************/

	package org.eclipse.m2e.core.ui.internal.preferences.launch;

	import java.io.File;
	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.List;
	import java.util.Set;

	import org.eclipse.core.resources.IProject;
	import org.eclipse.jface.viewers.ILabelProvider;
	import org.eclipse.jface.viewers.ILabelProviderListener;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.ITreeContentProvider;
	import org.eclipse.jface.viewers.TreeViewer;
	import org.eclipse.jface.viewers.Viewer;
	import org.eclipse.jface.window.Window;
	import org.eclipse.jface.wizard.WizardPage;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.graphics.Image;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.layout.RowLayout;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.DirectoryDialog;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Text;
	import org.eclipse.swt.widgets.Tree;
	import org.eclipse.ui.dialogs.ElementListSelectionDialog;

	import org.eclipse.m2e.core.MavenPlugin;
	import org.eclipse.m2e.core.internal.launch.AbstractMavenRuntime;
	import org.eclipse.m2e.core.internal.launch.ClasspathEntry;
	import org.eclipse.m2e.core.internal.launch.MavenExternalRuntime;
	import org.eclipse.m2e.core.internal.launch.MavenWorkspaceRuntime;
	import org.eclipse.m2e.core.internal.launch.ProjectClasspathEntry;
	import org.eclipse.m2e.core.project.IMavenProjectFacade;
	import org.eclipse.m2e.core.ui.internal.Messages;
	import org.eclipse.m2e.core.ui.internal.components.MavenProjectLabelProvider;


	@SuppressWarnings("restriction")
	public class MavenInstallationWizardPage extends WizardPage {

	private List<ClasspathEntry> extensions;

	private Text location;

	private Button btnAddProject;

	private Button btnRemove;

	private Button btnUp;

	private Button btnDown;

	private TreeViewer treeViewerLibrariries;

	private Text name;

	private AbstractMavenRuntime original;

	private Button btnExternal;

	private Button btnWorkspace;

	private Button btnDirectory;

	private Set<String> usedNames;

	class TreeContentProvider implements ITreeContentProvider {

	public void dispose() {
	}

	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
	}

	public Object[] getElements(Object inputElement) {
	return ((Collection<?>) inputElement).toArray();
	}

	public Object[] getChildren(Object parentElement) {
	return null;
	}

	public Object getParent(Object element) {
	return null;
	}

	public boolean hasChildren(Object element) {
	return false;
	}

	}

	class TreeLabelProvider implements ILabelProvider {

	public void addListener(ILabelProviderListener listener) {
	}

	public void dispose() {
	}

	public boolean isLabelProperty(Object element, String property) {
	return false;
	}

	public void removeListener(ILabelProviderListener listener) {
	}

	public Image getImage(Object element) {
	return null;
	}

	public String getText(Object element) {
	if(element instanceof ProjectClasspathEntry) {
	return ((ProjectClasspathEntry) element).getProject();
	}
	return element.toString();
	}
	}

	public MavenInstallationWizardPage(AbstractMavenRuntime original, Set<String> usedNames) {
	super(Messages.ExternalInstallPage_pageName);
	this.original = original;
	this.usedNames = usedNames;
	setDescription(Messages.ExternalInstallPage_description);

	this.extensions = original != null && original.getExtensions() != null ? original.getExtensions()
	: new ArrayList<ClasspathEntry>();
	}

	public void createControl(Composite parent) {
	Composite container = new Composite(parent, SWT.NULL);

	setControl(container);
	container.setLayout(new GridLayout(3, false));

	Label lblInstallationType = new Label(container, SWT.NONE);
	lblInstallationType.setText(Messages.MavenInstallationWizardPage_lblInstallationType_text);

	Composite composite = new Composite(container, SWT.NONE);
	RowLayout rl_composite = new RowLayout(SWT.HORIZONTAL);
	rl_composite.fill = true;
	composite.setLayout(rl_composite);
	composite.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 2, 1));

	btnExternal = new Button(composite, SWT.RADIO);
	btnExternal.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	changeRuntimeTypeAction();
	}
	});
	btnExternal.setText(Messages.MavenInstallationWizardPage_btnExternal_text_1);

	btnWorkspace = new Button(composite, SWT.RADIO);
	btnWorkspace.setText(Messages.MavenInstallationWizardPage_btnWorkspace_text);

	Label lblInstallationLocation = new Label(container, SWT.NONE);
	lblInstallationLocation.setText(Messages.ExternalInstallPage_lblInstallationLocation_text);

	location = new Text(container, SWT.BORDER);
	location.addModifyListener(e -> updateStatus());
	location.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));

	btnDirectory = new Button(container, SWT.NONE);
	btnDirectory.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	selectLocationAction();
	}
	});
	btnDirectory.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
	btnDirectory.setText(Messages.ExternalInstallPage_btnDirectory_text);

	Label lblInstallationName = new Label(container, SWT.NONE);
	lblInstallationName.setText(Messages.ExternalInstallPage_lblInstallationName_text);

	name = new Text(container, SWT.BORDER);
	name.addModifyListener(e -> updateStatus());
	name.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));

	Label lblInstallationLibraries = new Label(container, SWT.NONE);
	lblInstallationLibraries.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, false, false, 3, 1));
	lblInstallationLibraries.setText(Messages.ExternalInstallPage_lblInstallationLibraries_text);

	treeViewerLibrariries = new TreeViewer(container, SWT.BORDER);
	treeViewerLibrariries.addSelectionChangedListener(event -> updateButtonsState());
	treeViewerLibrariries.setContentProvider(new TreeContentProvider());
	treeViewerLibrariries.setLabelProvider(new TreeLabelProvider());
	treeViewerLibrariries.setInput(extensions);
	Tree treeLibraries = treeViewerLibrariries.getTree();
	treeLibraries.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 5));

	btnAddProject = new Button(container, SWT.NONE);
	btnAddProject.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	addProjectExtensionAction();
	}
	});
	btnAddProject.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
	btnAddProject.setText(Messages.ExternalInstallPage_btnAddProject_text);

	btnRemove = new Button(container, SWT.NONE);
	btnRemove.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	removeExtensionAction();
	}
	});
	btnRemove.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
	btnRemove.setText(Messages.ExternalInstallPage_btnRemove_text);

	btnUp = new Button(container, SWT.NONE);
	btnUp.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	moveExtensionAction(-1);
	}
	});
	btnUp.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
	btnUp.setText(Messages.ExternalInstallPage_btnUp_text);

	btnDown = new Button(container, SWT.NONE);
	btnDown.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	moveExtensionAction(1);
	}
	});
	btnDown.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
	btnDown.setText(Messages.ExternalInstallPage_btnDown_text);

	Button btnRestoreDefault = new Button(container, SWT.NONE);
	btnRestoreDefault.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	resetExtensionsAction();
	}
	});
	btnRestoreDefault.setLayoutData(new GridData(SWT.FILL, SWT.BOTTOM, false, false, 1, 1));
	btnRestoreDefault.setText(Messages.ExternalInstallPage_btnRestoreDefault_text);

	if(original instanceof MavenExternalRuntime) {
	btnExternal.setSelection(true);
	location.setText(original.getLocation());
	if(!original.isLegacy()) {
	name.setText(original.getName());
	}
	}
	if(original instanceof MavenWorkspaceRuntime) {
	btnWorkspace.setSelection(true);
	name.setText(original.getName());
	} else {
	btnWorkspace.setEnabled(new MavenWorkspaceRuntime("test").isAvailable()); //$NON-NLS-1$
	}
	if(original == null) {
	btnExternal.setSelection(true);
	}

	updateButtonsState();
	updateStatus();
	}

	protected void changeRuntimeTypeAction() {
	location.setEnabled(btnExternal.getSelection());
	btnDirectory.setEnabled(btnExternal.getSelection());
	updateStatus();
	}

	protected void moveExtensionAction(int offset) {
	int from = extensions.indexOf(getSelectedElement());
	int to = Math.min(extensions.size() - 1, Math.max(0, from + offset));
	Collections.swap(extensions, from, to);
	treeViewerLibrariries.refresh();
	}

	protected void resetExtensionsAction() {
	extensions.clear();
	treeViewerLibrariries.refresh();
	}

	protected void removeExtensionAction() {
	Object selection = getSelectedElement();
	extensions.remove(selection);
	treeViewerLibrariries.refresh();
	}

	protected void updateButtonsState() {
	Object selection = getSelectedElement();

	// can move/remove classpath entries only
	boolean editEnabled = selection != null;
	btnUp.setEnabled(editEnabled);
	btnDown.setEnabled(editEnabled);
	btnRemove.setEnabled(editEnabled);
	}

	private Object getSelectedElement() {
	return ((IStructuredSelection) treeViewerLibrariries.getSelection()).getFirstElement();
	}

	protected void addProjectExtensionAction() {
	List<IProject> projects = new ArrayList<IProject>();
	for(IMavenProjectFacade facade : MavenPlugin.getMavenProjectRegistry().getProjects()) {
	IProject project = facade.getProject();
	if(!contains(extensions, project)) {
	projects.add(project);
	}
	}
	Collections.sort(projects, (p1, p2) -> p1.getName().compareTo(p2.getName()));
	ElementListSelectionDialog dialog = new ElementListSelectionDialog(getShell(), new MavenProjectLabelProvider());
	dialog.setElements(projects.toArray());
	dialog.setMessage(Messages.MavenInstallationWizardPage_selectProjectMessage);
	dialog.setTitle(Messages.MavenInstallationWizardPage_selectProjectTitle);
	dialog.setHelpAvailable(false);
	dialog.setMultipleSelection(true);
	if(dialog.open() == Window.OK) {
	Object insertionPoint = getSelectedElement();
	if(insertionPoint == null \|\| insertionPoint instanceof ClasspathEntry) {
	int idx = Math.max(0, extensions.indexOf(insertionPoint));
	for(Object object : dialog.getResult()) {
	extensions.add(idx, new ProjectClasspathEntry(((IProject) object).getName()));
	}
	} else {
	throw new IllegalStateException();
	}
	treeViewerLibrariries.refresh();
	}
	}

	protected boolean contains(List<ClasspathEntry> entries, IProject project) {
	for(ClasspathEntry entry : entries) {
	if(entry instanceof ProjectClasspathEntry
	&& ((ProjectClasspathEntry) entry).getProject().equals(project.getName())) {
	return true;
	}
	}
	return false;
	}

	protected void selectLocationAction() {
	DirectoryDialog dlg = new DirectoryDialog(getShell());
	dlg.setText(Messages.MavenInstallationsPreferencePage_dialog_install_title);
	dlg.setMessage(Messages.MavenInstallationsPreferencePage_dialog_install_message);
	String dir = dlg.open();
	if(dir == null) {
	return;
	}
	location.setText(dir);
	if(name.getText().trim().isEmpty()) {
	name.setText(new File(dir).getName());
	}
	}

	private boolean isValidMavenInstall(String dir) {
	if(dir == null \|\| dir.length() == 0) {
	return false;
	}
	File selectedDir = new File(dir);
	if(!selectedDir.isDirectory()) {
	return false;
	}
	return new MavenExternalRuntime(dir).isAvailable();
	}

	protected void updateStatus() {
	setPageComplete(false);
	setMessage(null);
	setErrorMessage(null);

	if(btnExternal.getSelection()) {
	if(location.getText().trim().isEmpty()) {
	setMessage(Messages.MavenInstallationWizardPage_messageSelectHomeDirectory);
	return;
	}

	if(!isValidMavenInstall(location.getText())) {
	setErrorMessage(Messages.MavenInstallationWizardPage_messageHomeDirectoryIsNotMavenInstll);
	return;
	}
	}

	if(name.getText().trim().isEmpty()) {
	setMessage(Messages.MavenInstallationWizardPage_messageSelectInstallatonName);
	return;
	}

	if(usedNames.contains(name.getText().trim())) {
	setErrorMessage(Messages.MavenInstallationWizardPage_messageDuplicateInstallationName);
	return;
	}

	setPageComplete(true);
	}

	public AbstractMavenRuntime getResult() {
	AbstractMavenRuntime runtime;
	if(btnExternal.getSelection()) {
	runtime = new MavenExternalRuntime(name.getText(), location.getText());
	} else {
	runtime = new MavenWorkspaceRuntime(name.getText());
	}
	runtime.setExtensions(extensions);
	return runtime;
	}
	}