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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2015 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 *
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package org.glassfish.jersey.internal.util.collection;

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

import javax.ws.rs.core.MultivaluedHashMap;
import javax.ws.rs.core.MultivaluedMap;

/**
 * An immutable view of a {@link MultivaluedMap}.
 *
 * @param  the key
 * @param  the value
 * @author Gili Tzabari
 * @author Michal Gajdos
 */
public class ImmutableMultivaluedMap implements MultivaluedMap {

    /**
     * Returns an empty immutable map.
     *
     * @return an empty immutable map.
     */
    public static  ImmutableMultivaluedMap empty() {
        return new ImmutableMultivaluedMap(new MultivaluedHashMap());
    }

    private final MultivaluedMap delegate;

    /**
     * Creates a new ImmutableMultivaluedMap.
     *
     * @param delegate the underlying MultivaluedMap
     */
    public ImmutableMultivaluedMap(final MultivaluedMap delegate) {
        if (delegate == null) {
            throw new NullPointerException("ImmutableMultivaluedMap delegate must not be 'null'.");
        }
        this.delegate = delegate;
    }

    @Override
    public boolean equalsIgnoreValueOrder(final MultivaluedMap otherMap) {
        return delegate.equalsIgnoreValueOrder(otherMap);
    }

    @Override
    public void putSingle(final K key, final V value) {
        throw new UnsupportedOperationException("This MultivaluedMap implementation is immutable.");
    }

    @Override
    public void add(final K key, final V value) {
        throw new UnsupportedOperationException("This MultivaluedMap implementation is immutable.");
    }

    @Override
    public V getFirst(final K key) {
        return delegate.getFirst(key);
    }

    @Override
    public void addAll(final K key, final V... newValues) {
        throw new UnsupportedOperationException("This MultivaluedMap implementation is immutable.");
    }

    @Override
    public void addAll(final K key, final List valueList) {
        throw new UnsupportedOperationException("This MultivaluedMap implementation is immutable.");
    }

    @Override
    public void addFirst(final K key, final V value) {
        throw new UnsupportedOperationException("This MultivaluedMap implementation is immutable.");
    }

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

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

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

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

    @Override
    public List get(final Object key) {
        return delegate.get(key);
    }

    @Override
    public List put(final K key, final List value) {
        throw new UnsupportedOperationException("This MultivaluedMap implementation is immutable.");
    }

    @Override
    public List remove(final Object key) {
        throw new UnsupportedOperationException("This MultivaluedMap implementation is immutable.");
    }

    @Override
    public void putAll(final Map> m) {
        throw new UnsupportedOperationException("This MultivaluedMap implementation is immutable.");
    }

    @Override
    public void clear() {
        throw new UnsupportedOperationException("This MultivaluedMap implementation is immutable.");
    }

    @Override
    public Set keySet() {
        return Collections.unmodifiableSet(delegate.keySet());
    }

    @Override
    public Collection> values() {
        return Collections.unmodifiableCollection(delegate.values());
    }

    @Override
    public Set>> entrySet() {
        return Collections.unmodifiableSet(delegate.entrySet());
    }

    @Override
    public String toString() {
        return delegate.toString();
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof ImmutableMultivaluedMap)) {
            return false;
        }

        final ImmutableMultivaluedMap that = (ImmutableMultivaluedMap) o;

        if (!delegate.equals(that.delegate)) {
            return false;
        }

        return true;
    }

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