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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.assembly.builder.impl;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.tuscany.sca.assembly.Component;
import org.apache.tuscany.sca.assembly.Composite;
import org.apache.tuscany.sca.assembly.Implementation;
import org.apache.tuscany.sca.assembly.builder.CompositeBuilder;
import org.apache.tuscany.sca.assembly.builder.CompositeBuilderException;
import org.apache.tuscany.sca.definitions.Definitions;
import org.apache.tuscany.sca.monitor.Monitor;
/**
* A composite builder that clones nested composites.
*
* @version $Rev$ $Date$
*/
public class CompositeCloneBuilderImpl implements CompositeBuilder {
public CompositeCloneBuilderImpl() {
}
public void build(Composite composite, Definitions definitions, Monitor monitor) throws CompositeBuilderException {
expandCompositeImplementations(composite);
}
public String getID() {
return "org.apache.tuscany.sca.assembly.builder.CompositeCloneBuilder";
}
/**
* Expand composite component implementations.
*
* @param composite
* @param problems
*/
private void expandCompositeImplementations(Composite composite) {
for (Component component : composite.getComponents()) {
Implementation implementation = component.getImplementation();
if (implementation instanceof Composite) {
Composite compositeImplementation = (Composite)implementation;
Composite clone;
try {
clone = (Composite)compositeImplementation.clone();
} catch (CloneNotSupportedException e) {
throw new RuntimeException(e);
}
component.setImplementation(clone);
expandCompositeImplementations(clone);
}
}
}
/**
* Collect all nested composite implementations in a graph of composites.
*
* @param composite
* @param nested
*/
private void collectNestedComposites(Composite composite, List<Composite> nested) {
for (Component component : composite.getComponents()) {
Implementation implementation = component.getImplementation();
if (implementation instanceof Composite) {
Composite nestedComposite = (Composite)implementation;
nested.add(nestedComposite);
collectNestedComposites(nestedComposite, nested);
}
}
}
/**
* Fuse nested composites into a top level composite.
*
* @param composite
*/
private void fuseCompositeImplementations(Composite composite) {
// First collect all nested composites
List<Composite> nested = new ArrayList<Composite>();
collectNestedComposites(composite, nested);
// Then add all the non-composite components they contain
for (Composite nestedComposite : nested) {
for (Component component: nestedComposite.getComponents()) {
Implementation implementation = component.getImplementation();
if (!(implementation instanceof Composite)) {
composite.getComponents().add(component);
}
}
}
// Clear the initial list of composite components
for (Iterator<Component> i = composite.getComponents().iterator(); i.hasNext();) {
Component component = i.next();
if (component.getImplementation() instanceof Composite) {
i.remove();
}
}
}
}
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