JSONArray.java

/*
 * Copyright 1999-2011 Alibaba Group.
 *  
 * 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 com.alibaba.dubbo.common.json;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * JSONArray.
 * 
 * @author qian.lei
 */

public class JSONArray implements JSONNode
{
	private List<Object> mArray = new ArrayList<Object>();

	/**
	 * get.
	 * 
	 * @param index index.
	 * @return boolean or long or double or String or JSONArray or JSONObject or null.
	 */
	public Object get(int index)
	{
		return mArray.get(index);
	}

	/**
	 * get boolean value.
	 * 
	 * @param index index.
	 * @param def default value.
	 * @return value or default value.
	 */
	public boolean getBoolean(int index, boolean def)
	{
		Object tmp = mArray.get(index);
		return tmp != null && tmp instanceof Boolean ? ((Boolean)tmp).booleanValue() : def;
	}

	/**
	 * get int value.
	 * 
	 * @param index index.
	 * @param def default value.
	 * @return value or default value.
	 */
	public int getInt(int index, int def)
	{
		Object tmp = mArray.get(index);
		return tmp != null && tmp instanceof Number ? ((Number)tmp).intValue() : def;
	}

	/**
	 * get long value.
	 * 
	 * @param index index.
	 * @param def default value.
	 * @return value or default value.
	 */
	public long getLong(int index, long def)
	{
		Object tmp = mArray.get(index);
		return tmp != null && tmp instanceof Number ? ((Number)tmp).longValue() : def;
	}

	/**
	 * get float value.
	 * 
	 * @param index index.
	 * @param def default value.
	 * @return value or default value.
	 */
	public float getFloat(int index, float def)
	{
		Object tmp = mArray.get(index);
		return tmp != null && tmp instanceof Number ? ((Number)tmp).floatValue() : def;
	}

	/**
	 * get double value.
	 * 
	 * @param index index.
	 * @param def default value.
	 * @return value or default value.
	 */
	public double getDouble(int index, double def)
	{
		Object tmp = mArray.get(index);
		return tmp != null && tmp instanceof Number ? ((Number)tmp).doubleValue() : def;
	}

	/**
	 * get string value.
	 * 
	 * @param index index.
	 * @return value or default value.
	 */
	public String getString(int index)
	{
		Object tmp = mArray.get(index);
		return tmp == null ? null : tmp.toString();
	}

	/**
	 * get JSONArray value.
	 * 
	 * @param index index.
	 * @return value or default value.
	 */
	public JSONArray getArray(int index)
	{
		Object tmp = mArray.get(index);
		return tmp == null ? null : tmp instanceof JSONArray ? (JSONArray)tmp : null;
	}

	/**
	 * get JSONObject value.
	 * 
	 * @param index index.
	 * @return value or default value.
	 */
	public JSONObject getObject(int index)
	{
		Object tmp = mArray.get(index);
		return tmp == null ? null : tmp instanceof JSONObject ? (JSONObject)tmp : null;
	}

	/**
	 * get array length.
	 * 
	 * @return length.
	 */
	public int length()
	{
		return mArray.size();
	}

	/**
	 * add item.
	 */
	public void add(Object ele)
	{
		mArray.add(ele);
	}

	/**
	 * add items.
	 */
	public void addAll(Object[] eles)
	{
		for( Object ele : eles )
			mArray.add(ele);
	}

	/**
	 * add items.
	 */
	public void addAll(Collection<?> c)
	{
		mArray.addAll(c);
	}

	/**
	 * write json.
	 * 
	 * @param jc json converter
	 * @param jb json builder.
	 */
	public void writeJSON(JSONConverter jc, JSONWriter jb, boolean writeClass) throws IOException
	{
		jb.arrayBegin();
		for( Object item : mArray )
		{
			if( item == null )
				jb.valueNull();
			else
				jc.writeValue(item, jb, writeClass);
		}
		jb.arrayEnd();
	}
}