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/*******************************************************************************
* Copyright (c) 2009-2012 Mia-Software.
* 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:
* Gregoire Dupe (Mia-Software)
* Nicolas Bros (Mia-Software)
* Nicolas Bros (Mia-Software) - Bug 375054 - Add validation warning for overlay on EClass
*******************************************************************************/
package org.eclipse.emf.facet.common.sdk.core.internal;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IncrementalProjectBuilder;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.facet.common.sdk.core.internal.exported.CommonConstants;
import org.eclipse.emf.facet.common.sdk.core.internal.exported.IEmfFacetProjectBuilder;
import org.eclipse.emf.facet.util.core.Logger;
/**
* A builder for EMF Facet projects, that delegates to children builders provided by the extension point
* "builderRegistration".
*
* @author Gregoire Dupe (Mia-Software)
*/
public class EmfFacetProjectBuilder extends IncrementalProjectBuilder {
private static ArrayList<BuilderDescriptor> emffacetBuilders = null;
public EmfFacetProjectBuilder() {
super();
if (EmfFacetProjectBuilder.emffacetBuilders == null) {
EmfFacetProjectBuilder.emffacetBuilders = new ArrayList<BuilderDescriptor>();
synchronized (EmfFacetProjectBuilder.emffacetBuilders) {
final IConfigurationElement[] configs = Platform.getExtensionRegistry()
.getConfigurationElementsFor(CommonConstants.BUILDER_EXTENSION_POINT_ID);
for (final IConfigurationElement config : configs) {
try {
final String id = config.getDeclaringExtension().getUniqueIdentifier();
final IEmfFacetProjectBuilder builderInst = (IEmfFacetProjectBuilder) config
.createExecutableExtension("class"); //$NON-NLS-1$
final BuilderDescriptor builderDescriptor = new BuilderDescriptor(
builderInst, id);
EmfFacetProjectBuilder.emffacetBuilders.add(builderDescriptor);
for (final IConfigurationElement depends : config.getChildren("depends")) { //$NON-NLS-1$
builderDescriptor.getDependsOn().add(depends.getAttribute("builder")); //$NON-NLS-1$
}
} catch (final Exception e) {
Logger.logError(e, Activator.getDefault());
}
}
EmfFacetProjectBuilder.emffacetBuilders = sortBuilders(EmfFacetProjectBuilder.emffacetBuilders);
}
}
validateBuilderDependencies();
}
/**
* Sort builders by dependencies : first those that depend on nothing, then those that depend on those already in
* the list, etc.
*/
private static ArrayList<BuilderDescriptor> sortBuilders(final ArrayList<BuilderDescriptor> builders) {
final ArrayList<BuilderDescriptor> result = new ArrayList<EmfFacetProjectBuilder.BuilderDescriptor>();
final List<BuilderDescriptor> remaining = new LinkedList<EmfFacetProjectBuilder.BuilderDescriptor>();
remaining.addAll(builders);
while (!remaining.isEmpty()) {
boolean stuck = true;
final ListIterator<BuilderDescriptor> listIterator = remaining.listIterator();
while (listIterator.hasNext()) {
final BuilderDescriptor builder = listIterator.next();
// if it depends only on builders that are already in the list
// before it, then add it here
if (dependendsOnlyOn(builder, result)) {
result.add(builder);
listIterator.remove();
stuck = false;
}
}
if (stuck) {
throw new RuntimeException("Cannot order builders due to incoherent dependencies"); //$NON-NLS-1$
}
}
return result;
}
/** Whether the given builder only depends on those in the list. */
private static boolean dependendsOnlyOn(final BuilderDescriptor builder, final ArrayList<BuilderDescriptor> list) {
final List<String> dependsOn = builder.getDependsOn();
for (final String dep : dependsOn) {
boolean found = false;
for (final BuilderDescriptor prev : list) {
if (prev.getId().equals(dep)) {
found = true;
break;
}
}
if (!found) {
return false;
}
}
return true;
}
private static void validateBuilderDependencies() {
final List<String> idList = new ArrayList<String>();
for (final BuilderDescriptor descriptor : EmfFacetProjectBuilder.emffacetBuilders) {
idList.add(descriptor.getId());
}
for (final BuilderDescriptor descriptor : EmfFacetProjectBuilder.emffacetBuilders) {
for (final String dependsOn : descriptor.getDependsOn()) {
if (!idList.contains(dependsOn)) {
Logger.logWarning("The builder " + descriptor.getId() + " depends on " //$NON-NLS-1$//$NON-NLS-2$
+ dependsOn + " which does not exist.", Activator //$NON-NLS-1$
.getDefault());
}
}
}
}
@Override
protected void clean(final IProgressMonitor monitor) throws CoreException {
synchronized (EmfFacetProjectBuilder.emffacetBuilders) {
final Iterator<BuilderDescriptor> builders = EmfFacetProjectBuilder.emffacetBuilders
.iterator();
while (builders.hasNext()) {
final BuilderDescriptor builder = builders.next();
builder.getBuilderInst().clean(this, monitor);
}
}
}
@Override
protected IProject[] build(final int kind, @SuppressWarnings("rawtypes") final Map args, final IProgressMonitor monitor)
throws CoreException {
synchronized (EmfFacetProjectBuilder.emffacetBuilders) {
final Iterator<BuilderDescriptor> builders = EmfFacetProjectBuilder.emffacetBuilders
.iterator();
while (builders.hasNext()) {
final BuilderDescriptor builder = builders.next();
builder.getBuilderInst().build(this, kind, args, monitor);
}
}
return null;
}
/**
* This class is used to hold the builder id, the builder instance and the builder dependencies in a single
* structure.
*/
private class BuilderDescriptor {
private final IEmfFacetProjectBuilder builderInst;
private final List<String> dependsOn = new ArrayList<String>();
private final String id;
/**
* @param builderInst
* an instance of the described builder
* @param id
* the id of the described builder
*/
public BuilderDescriptor(final IEmfFacetProjectBuilder builderInst, final String id) {
this.builderInst = builderInst;
this.id = id;
}
public String getId() {
return this.id;
}
/** @return the list of dependencies on other EmfFacet builders. */
public List<String> getDependsOn() {
return this.dependsOn;
}
/** @return the instance of the described builder */
public IEmfFacetProjectBuilder getBuilderInst() {
return this.builderInst;
}
@Override
public String toString() {
return this.id + "(" + this.builderInst.getClass().getName() + ")"; //$NON-NLS-1$ //$NON-NLS-2$
}
}
}
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