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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* Licensed 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.model.assembly.impl;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.apache.tuscany.model.assembly.AssemblyContext;
import org.apache.tuscany.model.assembly.AssemblyObject;
import org.apache.tuscany.model.assembly.AssemblyVisitor;
/**
* A base class for assembly model objects.
*/
public abstract class AssemblyObjectImpl implements AssemblyObject {
private boolean frozen;
private boolean initialized;
protected AssemblyObjectImpl() {
}
public boolean accept(AssemblyVisitor visitor) {
return visitor.visit(this);
}
/**
* Walk a visitor through a collection of model objects.
* @param collection
* @param visitor
*/
protected boolean accept(Collection collection, AssemblyVisitor visitor) {
for (Object member : collection) {
if (member instanceof AssemblyObject) {
if (!((AssemblyObject)member).accept(visitor))
return false;
}
}
return true;
}
public void freeze() {
if (!frozen)
frozen=true;
}
/**
* Returns true if the object is frozen
*/
protected boolean isFrozen() {
return frozen;
}
/**
* Freeze a list and its members
*/
protected <T> List<T> freeze(List<T> list) {
list=Collections.unmodifiableList(list);
for (Object member : list) {
if (member instanceof AssemblyObject) {
((AssemblyObject)member).freeze();
}
}
return list;
}
/**
* Check that the current model object can be modified.
* @throws IllegalStateException
*/
protected void checkNotFrozen() {
if (frozen)
throw new IllegalStateException("Attempt to modify a frozen assembly model");
}
public void initialize(AssemblyContext modelContext) {
if (!initialized)
initialized=true;
}
/**
* Returns true if the object is initialized
*/
protected boolean isInitialized() {
return initialized;
}
/**
* Initialize members of a collection
*/
protected void initialize(Collection collection, AssemblyContext modelContext) {
for (Object member : collection) {
if (member instanceof AssemblyObject) {
((AssemblyObject)member).initialize(modelContext);
}
}
}
/**
* Check that the current model object is initialized.
* @throws IllegalStateException
*/
protected void checkInitialized() {
if (!initialized)
throw new IllegalStateException("Attempt to use an uninitialized assembly model");
}
}
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