/* AllocUtil.java

	Purpose:
		
	Description:
		
	History:
		2014/5/14 Created by henrichen

Copyright (C) 2014 Potix Corporation. All Rights Reserved.
 */
package org.zkoss.bind.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * For ZK-2289, Memory allocation utility.
 * @author henrichen
 * @since 7.0.3
 */
public class AllocUtil {
	public static AllocUtil inst = new AllocUtil();

	/**
	 * Put key, value into the specified map.
	 * @param map the map to be put key, value in.
	 * @param key the key
	 * @param value the value
	 * @return the map
	 */
	public <K, V> Map<K, V> putMap(Map<K, V> map, K key, V value) {
		if (map == null) {
			map = new HashMap<K, V>();
		}
		map.put(key, value);
		return map;
	}

	/**
	 * Put key, value into the specified LinkedHashMap.
	 * @param map the LinkedHashMap to be put key, value in.
	 * @param key the key
	 * @param value the value
	 * @return the map
	 */
	public <K, V> Map<K, V> putLinkedHashMap(Map<K, V> map, K key, V value) {
		if (map == null) {
			map = new LinkedHashMap<K, V>();
		}
		map.put(key, value);
		return map;
	}

	/**
	 * Prepare a suitable LinkedHashMap that optimize the space.
	 */
	public <K, V> Map<K, V> newLinkedHashMap(int size) {
		return new LinkedHashMap<K, V>();
	}

	/**
	 * Add value into the specified set.
	 * @param set the set to be add value in
	 * @param value the value
	 * @return the set
	 */
	public <V> Set<V> addSet(Set<V> set, V value) {
		if (set == null) {
			set = new HashSet<V>();
		}
		set.add(value);
		return set;
	}

	public <V> Set<V> addLinkedHashSet(Set<V> set, V value) {
		if (set == null) {
			set = new LinkedHashSet<V>();
		}
		set.add(value);
		return set;
	}

	public <V> Set<V> addWeakIdentityHashSet(Set<V> set, V value) {
		if (set == null) {
			set = new WeakIdentityMap<V, Boolean>().keySet();
		}
		set.add(value);
		return set;
	}

	/**
	 * Add value into the spcified list.
	 * @param list the list to be add value in
	 * @param value the value
	 * @return the list
	 */
	public <V> List<V> addList(List<V> list, V value) {
		if (list == null) {
			list = new ArrayList<V>();
		}
		list.add(value);
		return list;
	}

	/**
	 * Returns the processed script.
	 * @param script
	 */
	public Object processScript(Object script) {
		return script;
	}
}