/*******************************************************************************
* Copyright (c) 2005 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.core.internal.resources;
import java.util.*;
import org.eclipse.core.internal.utils.Cache;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.ProjectScope;
import org.eclipse.core.runtime.*;
import org.eclipse.core.runtime.content.*;
import org.eclipse.core.runtime.content.IContentTypeManager.ISelectionPolicy;
import org.eclipse.core.runtime.preferences.*;
import org.osgi.service.prefs.BackingStoreException;
import org.osgi.service.prefs.Preferences;
/**
* Manages project-specific content type behavior.
*
* @see ContentDescriptionManager
* @see IContentTypeManager.ISelectionPolicy
* @since 3.1
*/
public class ProjectContentTypes {
/**
* A project-aware content type selection policy.
* This class is also a dynamic scope context that will delegate to either
* project or instance scope depending on whether project specific settings were enabled
* for the project in question.
*/
private class ProjectContentTypeSelectionPolicy implements ISelectionPolicy, IScopeContext {
// corresponding project
private Project project;
// cached project scope
private IScopeContext projectScope;
public ProjectContentTypeSelectionPolicy(Project project) {
this.project = project;
this.projectScope = new ProjectScope(project);
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
public boolean equals(Object obj) {
if (this == obj)
return true;
if (!(obj instanceof IScopeContext))
return false;
IScopeContext other = (IScopeContext) obj;
if (!getName().equals(other.getName()))
return false;
IPath location = getLocation();
return location == null ? other.getLocation() == null : location.equals(other.getLocation());
}
private IScopeContext getDelegate() {
if (!usesContentTypePreferences(project.getName()))
return ProjectContentTypes.INSTANCE_SCOPE;
return projectScope;
}
public IPath getLocation() {
return getDelegate().getLocation();
}
public String getName() {
return getDelegate().getName();
}
public IEclipsePreferences getNode(String qualifier) {
return getDelegate().getNode(qualifier);
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
public int hashCode() {
return getName().hashCode();
}
public IContentType[] select(IContentType[] candidates, boolean fileName, boolean content) {
return ProjectContentTypes.this.select(project, candidates, fileName, content);
}
}
private static final String CONTENT_TYPE_PREF_NODE = "content-types"; //$NON-NLS-1$
static final InstanceScope INSTANCE_SCOPE = new InstanceScope();
private static final String PREF_LOCAL_CONTENT_TYPE_SETTINGS = "enabled"; //$NON-NLS-1$
private static final Preferences PROJECT_SCOPE = Platform.getPreferencesService().getRootNode().node(ProjectScope.SCOPE);
private Cache contentTypesPerProject;
private Workspace workspace;
static boolean usesContentTypePreferences(String projectName) {
try {
// be careful looking up for our node so not to create any nodes as side effect
Preferences node = PROJECT_SCOPE;
//TODO once bug 90500 is fixed, should be simpler
// for now, take the long way
if (!node.nodeExists(projectName))
return false;
node = node.node(projectName);
if (!node.nodeExists(Platform.PI_RUNTIME))
return false;
node = node.node(Platform.PI_RUNTIME);
if (!node.nodeExists(CONTENT_TYPE_PREF_NODE))
return false;
node = node.node(CONTENT_TYPE_PREF_NODE);
return node.getBoolean(PREF_LOCAL_CONTENT_TYPE_SETTINGS, false);
} catch (BackingStoreException e) {
// exception treated when retrieving the project preferences
}
return false;
}
public ProjectContentTypes(Workspace workspace) {
this.workspace = workspace;
// keep cache small
this.contentTypesPerProject = new Cache(5, 30, 0.4);
}
/**
* Collect content types associated to the natures configured for the given project.
*/
private Set collectAssociatedContentTypes(Project project) {
String[] enabledNatures = workspace.getNatureManager().getEnabledNatures(project);
if (enabledNatures.length == 0)
return Collections.EMPTY_SET;
Set related = new HashSet(enabledNatures.length);
for (int i = 0; i < enabledNatures.length; i++) {
ProjectNatureDescriptor descriptor = (ProjectNatureDescriptor) workspace.getNatureDescriptor(enabledNatures[i]);
if (descriptor == null)
// no descriptor found for the nature, skip it
continue;
String[] natureContentTypes = descriptor.getContentTypeIds();
for (int j = 0; j < natureContentTypes.length; j++)
// collect associate content types
related.add(natureContentTypes[j]);
}
return related;
}
public void contentTypePreferencesChanged(IProject project) {
final ProjectInfo info = (ProjectInfo) ((Project) project).getResourceInfo(false, false);
if (info != null)
info.setMatcher(null);
}
/**
* Creates a content type matcher for the given project. Takes natures and user settings into account.
*/
private IContentTypeMatcher createMatcher(Project project) {
ProjectContentTypeSelectionPolicy projectContentTypeSelectionPolicy = new ProjectContentTypeSelectionPolicy(project);
return Platform.getContentTypeManager().getMatcher(projectContentTypeSelectionPolicy, projectContentTypeSelectionPolicy);
}
private Set getAssociatedContentTypes(Project project) {
final ResourceInfo info = project.getResourceInfo(false, false);
if (info == null)
// the project has been deleted
return null;
final String projectName = project.getName();
synchronized (contentTypesPerProject) {
Cache.Entry entry = contentTypesPerProject.getEntry(projectName);
if (entry != null)
// we have an entry...
if (entry.getTimestamp() == info.getContentId())
// ...and it is not stale, so just return it
return (Set) entry.getCached();
// no cached information found, have to collect associated content types
Set result = collectAssociatedContentTypes(project);
if (entry == null)
// there was no entry before - create one
entry = contentTypesPerProject.addEntry(projectName, result, info.getContentId());
else {
// just update the existing entry
entry.setTimestamp(info.getContentId());
entry.setCached(result);
}
return result;
}
}
public IContentTypeMatcher getMatcherFor(Project project) throws CoreException {
ProjectInfo info = (ProjectInfo) project.getResourceInfo(false, false);
//fail if project has been deleted concurrently
if (info == null)
project.checkAccessible(project.getFlags(info));
IContentTypeMatcher matcher = info.getMatcher();
if (matcher != null)
return matcher;
matcher = createMatcher(project);
info.setMatcher(matcher);
return matcher;
}
/**
* Implements project specific, nature-based selection policy. No content types are vetoed.
*
* The criteria for this policy is as follows:
* <ol>
* <li>associated content types should appear before non-associated content types</li>
* <li>otherwise, relative ordering should be preserved.</li>
* </ol>
*
* @see IContentTypeManager.ISelectionPolicy
*/
final IContentType[] select(Project project, IContentType[] candidates, boolean fileName, boolean content) {
// since no vetoing is done here, don't go further if there is nothing to sort
if (candidates.length < 2)
return candidates;
final Set associated = getAssociatedContentTypes(project);
if (associated == null || associated.isEmpty())
// project has no content types associated
return candidates;
int associatedCount = 0;
for (int i = 0; i < candidates.length; i++)
// is it an associated content type?
if (associated.contains(candidates[i].getId())) {
// need to move it to the right spot (unless all types visited so far are associated as well)
if (associatedCount < i) {
final IContentType promoted = candidates[i];
// move all non-associated content types before it one one position up...
for (int j = i; j > associatedCount; j--)
candidates[j] = candidates[j - 1];
// ...so there is an empty spot for the content type we are promoting
candidates[associatedCount] = promoted;
}
associatedCount++;
}
return candidates;
}
}