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Groovy: A powerful, dynamic language for the JVM
/**
* 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.codehaus.groovy.binding;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* An aggregation of multiple bindings
* @author Danno Ferrin
* @since Groovy 1.6
*/
public class AggregateBinding implements BindingUpdatable {
protected boolean bound;
// use linked hash set so order is preserved
protected Set bindings = new LinkedHashSet();
public void addBinding(BindingUpdatable binding) {
if (binding == null || bindings.contains(binding)) return;
if (bound) binding.bind(); // bind is idempotent, so no state checking
bindings.add(binding);
}
public void removeBinding(BindingUpdatable binding) {
bindings.remove(binding);
}
public void bind() {
if (!bound) {
bound = true;
for (BindingUpdatable binding : bindings) {
binding.bind();
}
}
}
public void unbind() {
if (bound) {
for (BindingUpdatable binding : bindings) {
binding.unbind();
}
bound = false;
}
}
public void rebind() {
if (bound) {
unbind();
bind();
}
}
public void update() {
for (BindingUpdatable binding : bindings) {
binding.update();
}
}
public void reverseUpdate() {
for (BindingUpdatable binding : bindings) {
binding.reverseUpdate();
}
}
}