/*******************************************************************************
* Copyright (c) 2000, 2009 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.jdt.internal.core;
import java.io.ByteArrayInputStream;
import java.io.UnsupportedEncodingException;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.jdt.core.IBuffer;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaModelStatus;
import org.eclipse.jdt.core.IJavaModelStatusConstants;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.core.util.Messages;
import org.eclipse.jdt.internal.core.util.Util;
/**
* Commits the contents of a working copy compilation
* unit to its original element and resource, bringing
* the Java Model up-to-date with the current contents of the working
* copy.
*
* <p>It is possible that the contents of the
* original resource have changed since the working copy was created,
* in which case there is an update conflict. This operation allows
* for two settings to resolve conflict set by the <code>fForce</code> flag:<ul>
* <li>force flag is <code>false</code> - in this case an <code>JavaModelException</code>
* is thrown</li>
* <li>force flag is <code>true</code> - in this case the contents of
* the working copy are applied to the underlying resource even though
* the working copy was created before a subsequent change in the
* resource</li>
* </ul>
*
* <p>The default conflict resolution setting is the force flag is <code>false</code>
*
* A JavaModelOperation exception is thrown either if the commit could not
* be performed or if the new content of the compilation unit violates some Java Model
* constraint (e.g. if the new package declaration doesn't match the name of the folder
* containing the compilation unit).
*/
public class CommitWorkingCopyOperation extends JavaModelOperation {
/**
* Constructs an operation to commit the contents of a working copy
* to its original compilation unit.
*/
public CommitWorkingCopyOperation(ICompilationUnit element, boolean force) {
super(new IJavaElement[] {element}, force);
}
/**
* @exception JavaModelException if setting the source
* of the original compilation unit fails
*/
protected void executeOperation() throws JavaModelException {
try {
beginTask(Messages.workingCopy_commit, 2);
CompilationUnit workingCopy = getCompilationUnit();
if (ExternalJavaProject.EXTERNAL_PROJECT_NAME.equals(workingCopy.getJavaProject().getElementName())) {
// case of a working copy without a resource
workingCopy.getBuffer().save(this.progressMonitor, this.force);
return;
}
ICompilationUnit primary = workingCopy.getPrimary();
boolean isPrimary = workingCopy.isPrimary();
JavaElementDeltaBuilder deltaBuilder = null;
PackageFragmentRoot root = (PackageFragmentRoot)workingCopy.getAncestor(IJavaElement.PACKAGE_FRAGMENT_ROOT);
boolean isIncluded = !Util.isExcluded(workingCopy);
IFile resource = (IFile)workingCopy.getResource();
IJavaProject project = root.getJavaProject();
if (isPrimary || (root.validateOnClasspath().isOK() && isIncluded && resource.isAccessible() && Util.isValidCompilationUnitName(workingCopy.getElementName(), project.getOption(JavaCore.COMPILER_SOURCE, true), project.getOption(JavaCore.COMPILER_COMPLIANCE, true)))) {
// force opening so that the delta builder can get the old info
if (!isPrimary && !primary.isOpen()) {
primary.open(null);
}
// creates the delta builder (this remembers the content of the cu) if:
// - it is not excluded
// - and it is not a primary or it is a non-consistent primary
if (isIncluded && (!isPrimary || !workingCopy.isConsistent())) {
deltaBuilder = new JavaElementDeltaBuilder(primary);
}
// save the cu
IBuffer primaryBuffer = primary.getBuffer();
if (!isPrimary) {
if (primaryBuffer == null) return;
char[] primaryContents = primaryBuffer.getCharacters();
boolean hasSaved = false;
try {
IBuffer workingCopyBuffer = workingCopy.getBuffer();
if (workingCopyBuffer == null) return;
primaryBuffer.setContents(workingCopyBuffer.getCharacters());
primaryBuffer.save(this.progressMonitor, this.force);
primary.makeConsistent(this);
hasSaved = true;
} finally {
if (!hasSaved){
// restore original buffer contents since something went wrong
primaryBuffer.setContents(primaryContents);
}
}
} else {
// for a primary working copy no need to set the content of the buffer again
primaryBuffer.save(this.progressMonitor, this.force);
primary.makeConsistent(this);
}
} else {
// working copy on cu outside classpath OR resource doesn't exist yet
String encoding = null;
try {
encoding = resource.getCharset();
}
catch (CoreException ce) {
// use no encoding
}
String contents = workingCopy.getSource();
if (contents == null) return;
try {
byte[] bytes = encoding == null
? contents.getBytes()
: contents.getBytes(encoding);
ByteArrayInputStream stream = new ByteArrayInputStream(bytes);
if (resource.exists()) {
resource.setContents(
stream,
this.force ? IResource.FORCE | IResource.KEEP_HISTORY : IResource.KEEP_HISTORY,
null);
} else {
resource.create(
stream,
this.force,
this.progressMonitor);
}
} catch (CoreException e) {
throw new JavaModelException(e);
} catch (UnsupportedEncodingException e) {
throw new JavaModelException(e, IJavaModelStatusConstants.IO_EXCEPTION);
}
}
setAttribute(HAS_MODIFIED_RESOURCE_ATTR, TRUE);
// make sure working copy is in sync
workingCopy.updateTimeStamp((CompilationUnit)primary);
workingCopy.makeConsistent(this);
worked(1);
// build the deltas
if (deltaBuilder != null) {
deltaBuilder.buildDeltas();
// add the deltas to the list of deltas created during this operation
if (deltaBuilder.delta != null) {
addDelta(deltaBuilder.delta);
}
}
worked(1);
} finally {
done();
}
}
/**
* Returns the compilation unit this operation is working on.
*/
protected CompilationUnit getCompilationUnit() {
return (CompilationUnit)getElementToProcess();
}
protected ISchedulingRule getSchedulingRule() {
IResource resource = getElementToProcess().getResource();
if (resource == null) return null;
IWorkspace workspace = resource.getWorkspace();
if (resource.exists()) {
return workspace.getRuleFactory().modifyRule(resource);
} else {
return workspace.getRuleFactory().createRule(resource);
}
}
/**
* Possible failures: <ul>
* <li>INVALID_ELEMENT_TYPES - the compilation unit supplied to this
* operation is not a working copy
* <li>ELEMENT_NOT_PRESENT - the compilation unit the working copy is
* based on no longer exists.
* <li>UPDATE_CONFLICT - the original compilation unit has changed since
* the working copy was created and the operation specifies no force
* <li>READ_ONLY - the original compilation unit is in read-only mode
* </ul>
*/
public IJavaModelStatus verify() {
CompilationUnit cu = getCompilationUnit();
if (!cu.isWorkingCopy()) {
return new JavaModelStatus(IJavaModelStatusConstants.INVALID_ELEMENT_TYPES, cu);
}
if (cu.hasResourceChanged() && !this.force) {
return new JavaModelStatus(IJavaModelStatusConstants.UPDATE_CONFLICT);
}
// no read-only check, since some repository adapters can change the flag on save
// operation.
return JavaModelStatus.VERIFIED_OK;
}
}