| /** |
| * Copyright (c) 2007 Borland Software Corporation |
| * |
| * 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: |
| * bblajer - initial API and implementation |
| */ |
| package org.eclipse.gmf.internal.xpand.util; |
| |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.eclipse.gmf.internal.xpand.ResourceManager; |
| import org.eclipse.gmf.internal.xpand.ast.Advice; |
| import org.eclipse.gmf.internal.xpand.expression.AnalysationIssue; |
| import org.eclipse.gmf.internal.xpand.model.XpandAdvice; |
| import org.eclipse.gmf.internal.xpand.model.XpandDefinition; |
| import org.eclipse.gmf.internal.xpand.model.XpandExecutionContext; |
| import org.eclipse.gmf.internal.xpand.model.XpandResource; |
| |
| /** |
| * Composes several Xpand ast trees into a single resource. Definitions are merged: |
| * if definitions with duplicate signatures are found, the one that comes first (i.e., from a more recent source) wins. |
| * Advice declarations are aggregated: if several advice declarations have the same signature, all are returned in the order |
| * in which they are declared. |
| */ |
| public class CompositeXpandResource implements XpandResource { |
| private final XpandResource[] myDefinitions; |
| private final XpandResource[] myAdvices; |
| private XpandAdvice[] myCachedAdvices; |
| private XpandDefinition[] myCachedDefinitions; |
| private String[] myImportedNamespaces; |
| private String[] myImportedExtensions; |
| |
| /** |
| * Creates a composite resource from a non-empty array of definition resources and optional advice resources. |
| * @param manager Resource manager used to create this resource. It will not be remembered by the resource. |
| * @param definitions an array of definition resources. Must not be empty. |
| * @param advices an array of advice resources or <code>null</code> if no advice resources are available. |
| */ |
| public CompositeXpandResource(ResourceManager manager, XpandResource[] definitions, XpandResource[] advices) { |
| myDefinitions = definitions; |
| myAdvices = advices == null ? NO_RESOURCES : advices; |
| ArrayList<XpandDefinition> allDefinitions = new ArrayList<XpandDefinition>(); |
| HashSet<DefinitionSignature> signatures = new HashSet<DefinitionSignature>(); |
| XpandExecutionContext context = ContextFactory.createXpandContext(manager); |
| //Definitions are merged in the following order: first, all advice resources from newest to oldest, then all |
| //non-advice resources, from newest to oldest. |
| mergeDefinitions(context, myAdvices, allDefinitions, signatures); |
| mergeDefinitions(context, myDefinitions, allDefinitions, signatures); |
| myCachedDefinitions = allDefinitions.toArray(new XpandDefinition[allDefinitions.size()]); |
| //Advice declarations are collected (without merging) in the order from oldest to newest. |
| //Only advice resources are taken into consideration. |
| if (advices != null) { |
| ArrayList<XpandAdvice> allAdvices = new ArrayList<XpandAdvice>(); |
| collectAdvices(myAdvices, allAdvices); |
| myCachedAdvices = allAdvices.toArray(new XpandAdvice[allAdvices.size()]); |
| } else { |
| myCachedAdvices = NO_ADVICE; |
| } |
| } |
| |
| public XpandResource getFirstDefinition() { |
| return myDefinitions.length == 0 ? null : myDefinitions[0]; |
| } |
| |
| private void mergeDefinitions(XpandExecutionContext context, XpandResource[] resources, List<XpandDefinition> collector, Set<DefinitionSignature> usedSignatures) { |
| for (int i = 0; i < resources.length; i++) { |
| XpandResource nextResource = resources[i]; |
| context = context.cloneWithResource(nextResource); |
| XpandDefinition[] definitions = nextResource.getDefinitions(); |
| for (XpandDefinition nextDefinition : definitions) { |
| DefinitionSignature signature = DefinitionSignature.create(context, nextDefinition); |
| if (signature == null || usedSignatures.contains(signature)) { |
| continue; |
| } |
| usedSignatures.add(signature); |
| collector.add(nextDefinition); |
| } |
| } |
| } |
| |
| private void collectAdvices(XpandResource[] resources, List<XpandAdvice> collector) { |
| for (int i = resources.length - 1; i >= 0; i--) { |
| XpandResource nextResource = resources[i]; |
| XpandAdvice[] advices = nextResource.getAdvices(); |
| for (XpandAdvice nextAdvice : advices) { |
| collector.add(nextAdvice); |
| } |
| } |
| } |
| |
| public XpandAdvice[] getAdvices() { |
| return myCachedAdvices; |
| } |
| |
| public XpandDefinition[] getDefinitions() { |
| return myCachedDefinitions; |
| } |
| |
| public String getFullyQualifiedName() { |
| return myDefinitions[0].getFullyQualifiedName(); |
| } |
| |
| public String[] getImportedExtensions() { |
| if (myImportedExtensions == null) { |
| LinkedHashSet<String> result = new LinkedHashSet<String>(); |
| for (XpandResource nextResource : myDefinitions) { |
| for (String nextImport : nextResource.getImportedExtensions()) { |
| result.add(nextImport); |
| } |
| } |
| for (XpandResource nextResource : myAdvices) { |
| for (String nextImport : nextResource.getImportedExtensions()) { |
| result.add(nextImport); |
| } |
| } |
| myImportedExtensions = result.toArray(new String[result.size()]); |
| } |
| return myImportedExtensions; |
| } |
| |
| public String[] getImportedNamespaces() { |
| if (myImportedNamespaces == null) { |
| LinkedHashSet<String> result = new LinkedHashSet<String>(); |
| for (XpandResource nextResource : myDefinitions) { |
| for (String nextImport : nextResource.getImportedNamespaces()) { |
| result.add(nextImport); |
| } |
| } |
| for (XpandResource nextResource : myAdvices) { |
| for (String nextImport : nextResource.getImportedNamespaces()) { |
| result.add(nextImport); |
| } |
| } |
| myImportedNamespaces = result.toArray(new String[result.size()]); |
| } |
| return myImportedNamespaces; |
| } |
| |
| public void analyze(XpandExecutionContext ctx, Set<AnalysationIssue> issues) { |
| for (XpandResource next : myDefinitions) { |
| next.analyze(ctx, issues); |
| } |
| for (XpandResource next : myAdvices) { |
| next.analyze(ctx, issues); |
| } |
| } |
| |
| private static final XpandResource[] NO_RESOURCES = new XpandResource[0]; |
| private static final Advice[] NO_ADVICE = new Advice[0]; |
| } |