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/*******************************************************************************
* Copyright (c) 2006 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.team.internal.ui;
import java.io.InputStream;
import org.eclipse.compare.*;
import org.eclipse.core.resources.IEncodedStorage;
import org.eclipse.core.resources.IStorage;
import org.eclipse.core.runtime.*;
import org.eclipse.jface.text.IDocument;
import org.eclipse.swt.graphics.Image;
import org.eclipse.team.core.TeamException;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.texteditor.IDocumentProvider;
public abstract class StorageTypedElement implements ITypedElement, IEncodedStreamContentAccessor, IAdaptable {
private IStorage bufferedContents;
private final String localEncoding;
private ISharedDocumentAdapter sharedDocumentAdapter;
public StorageTypedElement(String localEncoding){
this.localEncoding = localEncoding;
}
public InputStream getContents() throws CoreException {
if (bufferedContents == null) {
cacheContents(new NullProgressMonitor());
}
if (bufferedContents != null) {
return bufferedContents.getContents();
}
return null;
}
/**
* Cache the contents for the remote resource in a local buffer.
* This method should be invoked before {@link #getContents()}
* to ensure that a round trip is not made in that method.
* @param monitor a progress monitor.
* @throws CoreException
*/
public void cacheContents(IProgressMonitor monitor) throws CoreException {
bufferedContents = fetchContents(monitor);
}
/**
* Returns an IStorage for the element.
* @param monitor
* @return a storage
* @throws TeamException
*/
abstract protected IStorage fetchContents(IProgressMonitor monitor) throws CoreException;
/**
* Return the {@link IStorage} that has been buffered for this element.
* @return the buffered storage
*/
public IStorage getBufferedStorage() {
return bufferedContents;
}
/* (non-Javadoc)
* @see org.eclipse.compare.ITypedElement#getImage()
*/
public Image getImage() {
return CompareUI.getImage(getType());
}
/* (non-Javadoc)
* @see org.eclipse.compare.ITypedElement#getType()
*/
public String getType() {
String name = getName();
if (name != null) {
int index = name.lastIndexOf('.');
if (index == -1)
return ""; //$NON-NLS-1$
if (index == (name.length() - 1))
return ""; //$NON-NLS-1$
return name.substring(index + 1);
}
return ITypedElement.FOLDER_TYPE;
}
/* (non-Javadoc)
* @see org.eclipse.compare.IEncodedStreamContentAccessor#getCharset()
*/
public String getCharset() throws CoreException {
if (localEncoding != null)
return localEncoding;
if (bufferedContents == null) {
cacheContents(new NullProgressMonitor());
}
if (bufferedContents instanceof IEncodedStorage) {
String charset = ((IEncodedStorage)bufferedContents).getCharset();
return charset;
}
return null;
}
/* (non-Javadoc)
* @see org.eclipse.core.runtime.IAdaptable#getAdapter(java.lang.Class)
*/
public Object getAdapter(Class adapter) {
if (adapter == ISharedDocumentAdapter.class) {
synchronized (this) {
if (sharedDocumentAdapter == null)
sharedDocumentAdapter = new SharedDocumentAdapter() {
public IEditorInput getDocumentKey(Object element) {
return StorageTypedElement.this.getDocumentKey(element);
}
public void flushDocument(IDocumentProvider provider,
IEditorInput documentKey, IDocument document,
boolean overwrite)
throws CoreException {
// The document is read-only
}
};
return sharedDocumentAdapter;
}
}
return Platform.getAdapterManager().getAdapter(this, adapter);
}
/**
* Method called from the shared document adapter to get the document key.
* @param element the element
* @return the document key
*/
protected abstract IEditorInput getDocumentKey(Object element);
public String getLocalEncoding() {
return localEncoding;
}
}
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