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Groovy: A powerful, dynamic language for the JVM
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/*
 * Copyright 2003-2010 the original author or authors.
 *
 * 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 groovy.lang;

import java.util.Collection;
import java.util.Map;
import java.util.Set;

/**
 * A wrapper for Map which allows a default value to be specified.
 *
 * @author Paul King
 * @since 1.7.1
 */
public final class MapWithDefault implements Map {

    private final Map delegate;
    private final Closure initClosure;

    private MapWithDefault(Map m, Closure initClosure) {
        delegate = m;
        this.initClosure = initClosure;
    }

    public static  Map newInstance(Map m, Closure initClosure) {
        return new MapWithDefault(m, initClosure);
    }

    public int size() {
        return delegate.size();
    }

    public boolean isEmpty() {
        return delegate.isEmpty();
    }

    public boolean containsKey(Object key) {
        return delegate.containsKey(key);
    }

    public boolean containsValue(Object value) {
        return delegate.containsValue(value);
    }

    public V get(Object key) {
        if (!delegate.containsKey(key)) {
            delegate.put((K)key, (V)initClosure.call(new Object[]{key}));
        }
        return delegate.get(key);
    }

    public V put(K key, V value) {
        return delegate.put(key, value);
    }

    public V remove(Object key) {
        return delegate.remove(key);
    }

    public void putAll(Map m) {
        delegate.putAll(m);
    }

    public void clear() {
        delegate.clear();
    }

    public Set keySet() {
        return delegate.keySet();
    }

    public Collection values() {
        return delegate.values();
    }

    public Set> entrySet() {
        return delegate.entrySet();
    }

    @Override
    public boolean equals(Object obj) {
        return delegate.equals(obj);
    }

    @Override
    public int hashCode() {
        return delegate.hashCode();
    }
}