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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.qpid.server.cluster.util;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
/**
* Maps two separate keys to a list of values.
*
*/
public class Bindings<K1, K2, V>
{
private final MultiValuedMap<K1, Binding<K2>> _a = new MultiValuedMap<K1, Binding<K2>>();
private final MultiValuedMap<K2, Binding<K1>> _b = new MultiValuedMap<K2, Binding<K1>>();
private final Collection<V> _values = new HashSet<V>();
public void bind(K1 key1, K2 key2, V value)
{
_a.add(key1, new Binding<K2>(key2, value));
_b.add(key2, new Binding<K1>(key1, value));
_values.add(value);
}
public void unbind1(K1 key1)
{
Collection<Binding<K2>> values = _a.remove(key1);
for (Binding<K2> v : values)
{
_b.remove(v.key);
_values.remove(v.value);
}
}
public void unbind2(K2 key2)
{
Collection<Binding<K1>> values = _b.remove(key2);
for (Binding<K1> v : values)
{
_a.remove(v.key);
_values.remove(v.value);
}
}
public Collection<V> values()
{
return Collections.unmodifiableCollection(_values);
}
/**
* Value needs to hold key to the other map
*/
private class Binding<T>
{
private final T key;
private final V value;
Binding(T key, V value)
{
this.key = key;
this.value = value;
}
}
}
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