| /******************************************************************************* |
| * Copyright (c) 2006 IBM Corporation. |
| * Licensed Material - Property of IBM. All rights reserved. |
| * US Government Users Restricted Rights - Use, duplication or disclosure |
| * restricted by GSA ADP Schedule Contract with IBM Corp. |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.examples.navigator; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Enumeration; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Properties; |
| |
| import org.eclipse.core.resources.IFile; |
| import org.eclipse.core.resources.IResource; |
| import org.eclipse.core.resources.IResourceChangeEvent; |
| import org.eclipse.core.resources.IResourceChangeListener; |
| import org.eclipse.core.resources.IResourceDelta; |
| import org.eclipse.core.resources.IResourceDeltaVisitor; |
| import org.eclipse.core.resources.ResourcesPlugin; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.jface.viewers.ITreeContentProvider; |
| import org.eclipse.jface.viewers.StructuredViewer; |
| import org.eclipse.jface.viewers.Viewer; |
| import org.eclipse.ui.progress.UIJob; |
| |
| /** |
| * Provides the properties contained in a *.properties file as children of that |
| * file in a Common Navigator. |
| * @since 3.2 |
| */ |
| public class PropertiesContentProvider implements ITreeContentProvider, |
| IResourceChangeListener, IResourceDeltaVisitor { |
| |
| private static final Object[] NO_CHILDREN = new Object[0]; |
| |
| private static final Object PROPERTIES_EXT = "properties"; //$NON-NLS-1$ |
| |
| private final Map/*<IFile, PropertiesTreeData[]>*/ cachedModelMap = new HashMap(); |
| |
| private StructuredViewer viewer; |
| |
| /** |
| * Create the PropertiesContentProvider instance. |
| * |
| * Adds the content provider as a resource change listener to track changes on disk. |
| * |
| */ |
| public PropertiesContentProvider() { |
| ResourcesPlugin.getWorkspace().addResourceChangeListener(this, IResourceChangeEvent.POST_CHANGE); |
| } |
| |
| /** |
| * Return the model elements for a *.properties IFile or |
| * NO_CHILDREN for otherwise. |
| */ |
| public Object[] getChildren(Object parentElement) { |
| Object[] children = null; |
| if (parentElement instanceof PropertiesTreeData) { |
| children = NO_CHILDREN; |
| } else if(parentElement instanceof IFile) { |
| /* possible model file */ |
| IFile modelFile = (IFile) parentElement; |
| if(PROPERTIES_EXT.equals(modelFile.getFileExtension())) { |
| children = (PropertiesTreeData[]) cachedModelMap.get(modelFile); |
| if(children == null && updateModel(modelFile) != null) { |
| children = (PropertiesTreeData[]) cachedModelMap.get(modelFile); |
| } |
| } |
| } |
| return children != null ? children : NO_CHILDREN; |
| } |
| |
| /** |
| * Load the model from the given file, if possible. |
| * @param modelFile The IFile which contains the persisted model |
| */ |
| private synchronized Properties updateModel(IFile modelFile) { |
| |
| if(PROPERTIES_EXT.equals(modelFile.getFileExtension()) ) { |
| Properties model = new Properties(); |
| if (modelFile.exists()) { |
| try { |
| model.load(modelFile.getContents()); |
| |
| String propertyName; |
| List properties = new ArrayList(); |
| for(Enumeration names = model.propertyNames(); names.hasMoreElements(); ) { |
| propertyName = (String) names.nextElement(); |
| properties.add(new PropertiesTreeData(propertyName, model.getProperty(propertyName), modelFile)); |
| } |
| PropertiesTreeData[] propertiesTreeData = (PropertiesTreeData[]) |
| properties.toArray(new PropertiesTreeData[properties.size()]); |
| |
| cachedModelMap.put(modelFile, propertiesTreeData); |
| return model; |
| } catch (IOException e) { |
| } catch (CoreException e) { |
| } |
| } else { |
| cachedModelMap.remove(modelFile); |
| } |
| } |
| return null; |
| } |
| |
| public Object getParent(Object element) { |
| if (element instanceof PropertiesTreeData) { |
| PropertiesTreeData data = (PropertiesTreeData) element; |
| return data.getFile(); |
| } |
| return null; |
| } |
| |
| public boolean hasChildren(Object element) { |
| if (element instanceof PropertiesTreeData) { |
| return false; |
| } else if(element instanceof IFile) { |
| return PROPERTIES_EXT.equals(((IFile) element).getFileExtension()); |
| } |
| return false; |
| } |
| |
| public Object[] getElements(Object inputElement) { |
| return getChildren(inputElement); |
| } |
| |
| public void dispose() { |
| cachedModelMap.clear(); |
| ResourcesPlugin.getWorkspace().removeResourceChangeListener(this); |
| } |
| |
| public void inputChanged(Viewer aViewer, Object oldInput, Object newInput) { |
| if (oldInput != null && !oldInput.equals(newInput)) |
| cachedModelMap.clear(); |
| viewer = (StructuredViewer) aViewer; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.core.resources.IResourceChangeListener#resourceChanged(org.eclipse.core.resources.IResourceChangeEvent) |
| */ |
| public void resourceChanged(IResourceChangeEvent event) { |
| |
| IResourceDelta delta = event.getDelta(); |
| try { |
| delta.accept(this); |
| } catch (CoreException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.core.resources.IResourceDeltaVisitor#visit(org.eclipse.core.resources.IResourceDelta) |
| */ |
| public boolean visit(IResourceDelta delta) { |
| |
| IResource source = delta.getResource(); |
| switch (source.getType()) { |
| case IResource.ROOT: |
| case IResource.PROJECT: |
| case IResource.FOLDER: |
| return true; |
| case IResource.FILE: |
| final IFile file = (IFile) source; |
| if (PROPERTIES_EXT.equals(file.getFileExtension())) { |
| updateModel(file); |
| new UIJob("Update Properties Model in CommonViewer") { //$NON-NLS-1$ |
| public IStatus runInUIThread(IProgressMonitor monitor) { |
| if (viewer != null && !viewer.getControl().isDisposed()) |
| viewer.refresh(file); |
| return Status.OK_STATUS; |
| } |
| }.schedule(); |
| } |
| return false; |
| } |
| return false; |
| } |
| } |