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Jave Web Validator Framework
There is a newer version: 1.0.2-release
/*
 * Copyright 2002-2014 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 org.devefx.validator.util;

import java.io.Serializable;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Simple implementation of {@link MultiValueMap} that wraps a {@link LinkedHashMap},
 * storing multiple values in a {@link LinkedList}.
 *
 * This Map implementation is generally not thread-safe. It is primarily designed
 * for data structures exposed from request objects, for use in a single thread only.
 *
 * @author Arjen Poutsma
 * @author Juergen Hoeller
 * @since 3.0
 */
public class LinkedMultiValueMap implements MultiValueMap, Serializable {

    private static final long serialVersionUID = 3801124242820219131L;

    private final Map> targetMap;


    /**
     * Create a new LinkedMultiValueMap that wraps a {@link LinkedHashMap}.
     */
    public LinkedMultiValueMap() {
        this.targetMap = new LinkedHashMap>();
    }

    /**
     * Create a new LinkedMultiValueMap that wraps a {@link LinkedHashMap}
     * with the given initial capacity.
     * @param initialCapacity the initial capacity
     */
    public LinkedMultiValueMap(int initialCapacity) {
        this.targetMap = new LinkedHashMap>(initialCapacity);
    }

    /**
     * Copy constructor: Create a new LinkedMultiValueMap with the same mappings
     * as the specified Map.
     * @param otherMap the Map whose mappings are to be placed in this Map
     */
    public LinkedMultiValueMap(Map> otherMap) {
        this.targetMap = new LinkedHashMap>(otherMap);
    }


    // MultiValueMap implementation

    @Override
    public void add(K key, V value) {
        List values = this.targetMap.get(key);
        if (values == null) {
            values = new LinkedList();
            this.targetMap.put(key, values);
        }
        values.add(value);
    }

    @Override
    public V getFirst(K key) {
        List values = this.targetMap.get(key);
        return (values != null ? values.get(0) : null);
    }

    @Override
    public void set(K key, V value) {
        List values = new LinkedList();
        values.add(value);
        this.targetMap.put(key, values);
    }

    @Override
    public void setAll(Map values) {
        for (Entry entry : values.entrySet()) {
            set(entry.getKey(), entry.getValue());
        }
    }

    @Override
    public Map toSingleValueMap() {
        LinkedHashMap singleValueMap = new LinkedHashMap(this.targetMap.size());
        for (Entry> entry : targetMap.entrySet()) {
            singleValueMap.put(entry.getKey(), entry.getValue().get(0));
        }
        return singleValueMap;
    }


    // Map implementation

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

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

    @Override
    public boolean containsKey(Object key) {
        return this.targetMap.containsKey(key);
    }

    @Override
    public boolean containsValue(Object value) {
        return this.targetMap.containsValue(value);
    }

    @Override
    public List get(Object key) {
        return this.targetMap.get(key);
    }

    @Override
    public List put(K key, List value) {
        return this.targetMap.put(key, value);
    }

    @Override
    public List remove(Object key) {
        return this.targetMap.remove(key);
    }

    @Override
    public void putAll(Map> m) {
        this.targetMap.putAll(m);
    }

    @Override
    public void clear() {
        this.targetMap.clear();
    }

    @Override
    public Set keySet() {
        return this.targetMap.keySet();
    }

    @Override
    public Collection> values() {
        return this.targetMap.values();
    }

    @Override
    public Set>> entrySet() {
        return this.targetMap.entrySet();
    }


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

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

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