org.eclipse.compare.ResourceNode Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of org.eclipse.compare Show documentation
This is org.eclipse.compare jar used by Scout SDK
The newest version!
/*******************************************************************************
 * Copyright (c) 2000, 2011 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.compare;

import java.io.*;
import java.util.ArrayList;

import org.eclipse.compare.internal.Utilities;
import org.eclipse.compare.structuremergeviewer.IStructureComparator;
import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.*;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Shell;

/**
 * A ResourceNode wraps an IResources so that it can be used
 * as input for the differencing engine (interfaces IStructureComparator and ITypedElement)
 * and the ReplaceWithEditionDialog (interfaces ITypedElement and IModificationDate).
 * 
 * Clients may instantiate this class; it is not intended to be subclassed.
 * 
 * @noextend This class is not intended to be subclassed by clients.
 */
public class ResourceNode extends BufferedContent
			implements IEncodedStreamContentAccessor, IStructureComparator, ITypedElement,
							IEditableContent, IModificationDate, IResourceProvider, IEditableContentExtension {
			
	private IResource fResource;
	private ArrayList fChildren;
		
	
	/**
	 * Creates a ResourceNode for the given resource.
	 *
	 * @param resource the resource
	 */
	public ResourceNode(IResource resource) {
		fResource= resource;
		Assert.isNotNull(resource);
	}
		
	/**
	 * Returns the corresponding resource for this object.
	 *
	 * @return the corresponding resource
	 */
	public IResource getResource() {
		return fResource;
	}
	
	/* (non Javadoc)
	 * see IStreamContentAccessor.getContents
	 */
	public InputStream getContents() throws CoreException {
		if (fResource instanceof IStorage)
			return super.getContents();
		return null;
	}
	
	/* (non Javadoc)
	 * see IModificationDate.getModificationDate
	 */
	public long getModificationDate() {
		return fResource.getLocalTimeStamp();
	}
	
	/* (non Javadoc)
	 * see ITypedElement.getName
	 */
	public String getName() {
		if (fResource != null)
			return fResource.getName();
		return null;
	}
		
	/* (non Javadoc)
	 * see ITypedElement.getType
	 */
	public String getType() {
		if (fResource instanceof IContainer)
			return ITypedElement.FOLDER_TYPE;
		if (fResource != null) {
			String s= fResource.getFileExtension();
			if (s != null)
				return s;
		}
		return ITypedElement.UNKNOWN_TYPE;
	}
	
	/* (non Javadoc)
	 * see ITypedElement.getImage
	 */
	public Image getImage() {
		return CompareUI.getImage(fResource);
	}

	/*
	 * Returns true if the other object is of type ITypedElement
	 * and their names are identical. The content is not considered.
	 */
	public boolean equals(Object other) {
		if (other instanceof ITypedElement) {
			String otherName= ((ITypedElement)other).getName();
			return getName().equals(otherName);
		}
		return super.equals(other);
	}
	
	/**
	 * Returns the hash code of the name.
     * @return a hash code value for this object.
	 */
	public int hashCode() {
		return getName().hashCode();
	}
	
	/* (non Javadoc)
	 * see IStructureComparator.getChildren
	 */
	public Object[] getChildren() {
		if (fChildren == null) {
			fChildren= new ArrayList();
			if (fResource instanceof IContainer) {
				try {
					IResource members[]= ((IContainer)fResource).members();
					for (int i= 0; i < members.length; i++) {
						IStructureComparator child= createChild(members[i]);
						if (child != null)
							fChildren.add(child);
					}
				} catch (CoreException ex) {
					// NeedWork
				}
			}
		}
		return fChildren.toArray();
	}
	
	/**
	 * This hook method is called from getChildren once for every
	 * member of a container resource. This implementation
	 * creates a new ResourceNode for the given child resource.
	 * Clients may override this method to create a different type of
	 * IStructureComparator or to filter children by returning null.
	 *
	 * @param child the child resource for which a IStructureComparator must be returned
	 * @return a ResourceNode for the given child or null
	 */
	protected IStructureComparator createChild(IResource child) {
		return new ResourceNode(child);
	}
		
	/**
	 * Returns an open stream if the corresponding resource implements the
	 * IStorage interface. Otherwise the value null is returned.
	 *
	 * @return a buffered input stream containing the contents of this storage
	 * @exception CoreException if the contents of this storage could not be accessed
	 */
	protected InputStream createStream() throws CoreException {
		if (fResource instanceof IStorage) {
			InputStream is= null;
			IStorage storage= (IStorage) fResource;
			try {
				is= storage.getContents();
			} catch (CoreException e) {
				if (e.getStatus().getCode() == IResourceStatus.OUT_OF_SYNC_LOCAL) {
					fResource.refreshLocal(IResource.DEPTH_INFINITE, null);
					is= storage.getContents();
				} else
					throw e;
			}
			if (is != null)
				return new BufferedInputStream(is);
		}
		return null;
	}
			
	/* (non Javadoc)
	 * see IEditableContent.isEditable
	 */
	public boolean isEditable() {
		return true;
	}
	
	/* (non Javadoc)
	 * see IEditableContent.replace
	 */
	public ITypedElement replace(ITypedElement child, ITypedElement other) {
		return child;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.compare.IEncodedStreamContentAccessor#getCharset()
	 */
	public String getCharset() {
		return Utilities.getCharset(fResource);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.compare.IEditableContentExtension#isReadOnly()
	 */
	public boolean isReadOnly() {
		if (fResource.getType() == IResource.FILE) {
			ResourceAttributes attrs = fResource.getResourceAttributes();
			if (attrs != null) {
				return attrs.isReadOnly();
			}
		}
		return false;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.compare.IEditableContentExtension#validateEdit(org.eclipse.swt.widgets.Shell)
	 */
	public IStatus validateEdit(Shell shell) {
		if (isReadOnly())
			return ResourcesPlugin.getWorkspace().validateEdit(new IFile[] { (IFile)fResource}, shell);
		return Status.OK_STATUS;
	}
}