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/*******************************************************************************
* Copyright (c) 2010, 2019 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.jsf.common.internal.resource;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.ElementChangedEvent;
import org.eclipse.jdt.core.IElementChangedListener;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaElementDelta;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jst.jsf.common.JSFCommonPlugin;
import org.eclipse.jst.jsf.common.internal.resource.IClasspathLifecycleListener.ClasspathLifecycleEvent;
/**
* @author cbateman
*/
public class ClasspathEntryLifecycleListener
extends
AbstractLifecycleListener<IClasspathLifecycleListener.ClasspathLifecycleEvent, IClasspathLifecycleListener, IProject>
implements IElementChangedListener
{
private final JavaCoreMediator _mediator;
/**
* Initialize an inactive lifecycle listener. A classpath listener will not
* be installed by this constructor. The object created using this
* constructor will not fire any events until addClasspathEntry is called at
* least once to add a target resource
*
* @param mediator
* the mediator to use to access JavaCore operations
* @throws NullPointerException
* if mediator is null.
*/
public ClasspathEntryLifecycleListener(final JavaCoreMediator mediator)
{
if (mediator == null)
{
throw new NullPointerException(CANNOT_ADD_NULL_RESOURCE);
}
_mediator = mediator;
}
/**
* Create a new lifecycle listener for the res
*
* @param entry
* @param mediator
* the workspace to listen to for changes.
* @throws NullPointerException
* if res or workspace is null.
*/
public ClasspathEntryLifecycleListener(final IProject entry,
final JavaCoreMediator mediator)
{
this(mediator);
if (entry == null)
{
throw new NullPointerException(CANNOT_ADD_NULL_RESOURCE);
}
addLifecycleObject(entry);
}
public void elementChanged(final ElementChangedEvent event)
{
// we are only interested in package fragment roots that are listening
// for
if (event.getType() == ElementChangedEvent.POST_CHANGE)
{
handlePostChangeEvent(event);
}
}
private void handlePostChangeEvent(final ElementChangedEvent event)
{
final IJavaElementDelta delta = event.getDelta();
new DeltaAcceptor().accept(new DeltaAcceptor.DeltaVisitor()
{
public void visit(final IJavaElementDelta visitDelta)
{
// we are only interested in package_fragment_root's
final IJavaElement element = visitDelta.getElement();
// only interested if a project in our entries list owns the
// element.
final IJavaProject javaProject = element.getJavaProject();
if (javaProject == null
|| !getLifecycleObjects().contains(
javaProject.getProject()))
{
return;
}
if (element.getElementType() == IJavaElement.PACKAGE_FRAGMENT_ROOT)
{
handlePackageFragmentRoot(visitDelta);
} else if (element.getElementType() == IJavaElement.JAVA_PROJECT
&& visitDelta.getResourceDeltas() != null)
{
handleProject(visitDelta);
}
// need to test the flags only for package fragment roots
}
private void handleProject(final IJavaElementDelta visitDelta)
{
for (final IResourceDelta resDelta : visitDelta
.getResourceDeltas())
{
try
{
resDelta.accept(new IResourceDeltaVisitor()
{
public boolean visit(final IResourceDelta resDelta2)
throws CoreException
{
if (resDelta2.getKind() == IResourceDelta.REMOVED
&& resDelta2.getResource().getType() == IResource.FILE
&& "jar".equals(resDelta2.getResource().getFileExtension())) //$NON-NLS-1$
{
fireLifecycleEvent(new ClasspathLifecycleEvent(
ClasspathEntryLifecycleListener.this,
visitDelta.getElement(),
ClasspathLifecycleEvent.Type.REMOVED_DELTA,
resDelta2.getResource()));
}
return true;
}
});
} catch (final CoreException e)
{
JSFCommonPlugin.log(e);
}
}
}
private void handlePackageFragmentRoot(
final IJavaElementDelta visitDelta)
{
final int flags = visitDelta.getFlags();
switch (visitDelta.getKind())
{
case IJavaElementDelta.ADDED:
{
fireLifecycleEvent(new ClasspathLifecycleEvent(
ClasspathEntryLifecycleListener.this,
visitDelta.getElement(),
ClasspathLifecycleEvent.Type.ADDED));
}
break;
case IJavaElementDelta.REMOVED:
{
fireLifecycleEvent(new ClasspathLifecycleEvent(
ClasspathEntryLifecycleListener.this,
visitDelta.getElement(),
ClasspathLifecycleEvent.Type.REMOVED));
}
break;
case IJavaElementDelta.CHANGED:
if ((flags & IJavaElementDelta.F_ADDED_TO_CLASSPATH) != 0)
{
fireLifecycleEvent(new ClasspathLifecycleEvent(
ClasspathEntryLifecycleListener.this,
visitDelta.getElement(),
ClasspathLifecycleEvent.Type.ADDED));
} else if ((flags & IJavaElementDelta.F_REMOVED_FROM_CLASSPATH) != 0)
{
fireLifecycleEvent(new ClasspathLifecycleEvent(
ClasspathEntryLifecycleListener.this,
visitDelta.getElement(),
ClasspathLifecycleEvent.Type.REMOVED));
} else if ((flags & IJavaElementDelta.F_REORDER) != 0)
{
// TODO: how important is the case of a classpath
// reordering?
}
break;
}
}
}, delta);
}
@Override
protected void addSystemChangeListener()
{
_mediator.addElementChangedListener(this);
}
@Override
protected void removeSystemChangeListener()
{
_mediator.removeElementChangeListener(this);
}
private static class DeltaAcceptor
{
public interface DeltaVisitor
{
public void visit(final IJavaElementDelta delta);
}
public void accept(final DeltaVisitor visitor,
final IJavaElementDelta delta)
{
visitor.visit(delta);
for (final IJavaElementDelta childDelta : delta
.getAffectedChildren())
{
accept(visitor, childDelta);
}
}
}
}
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