zkoss/zk

/*
 * $Id: JSONArray.java,v 1.1 2006/04/15 14:10:48 platform Exp $
 * Created on 2006-4-10
 */
package org.zkoss.json;

import java.util.Collection;
import java.util.LinkedList;
import java.util.Iterator;
import java.util.List;


/**
 * A JSON array. JSONObject supports java.util.List interface.
 * 
 * @author FangYidong<fangyidong@yahoo.com.cn>
 */
public class JSONArray extends LinkedList<Object> implements List<Object>, JSONAware {
    private static final long serialVersionUID = 3957988303675231981L;

    /**
     * Convert a list to JSON text. The result is a JSON array. 
     * If this list is also a JSONAware, JSONAware specific behaviors will be omitted at this top level.
     * 
     * @see JSONValue#toJSONString(Object)
     * 
     * @param collection
     * @return JSON text, or "null" if list is null.
     */
    public static String toJSONString(Collection collection){
        if(collection == null)
            return "null";
        
        boolean first = true;
        StringBuffer sb = new StringBuffer();
        Iterator iter=collection.iterator();
        
        sb.append('[');
        while(iter.hasNext()){
            if(first)
                first = false;
            else
                sb.append(',');
            
            Object value=iter.next();
            if(value == null){
                sb.append("null");
                continue;
            }
            sb.append(JSONValue.toJSONString(value));
        }
        sb.append(']');
        return sb.toString();
    }
    
    /** Convert an object array to JSON text.
     * <p>patched by tomyeh
     */
    public static String toJSONString(Object[] ary) {
        if (ary == null)
            return "null";

        final StringBuffer sb = new StringBuffer().append('[');
        for (int j = 0; j < ary.length; j++) {
            if (j > 0) sb.append(',');
            sb.append(JSONValue.toJSONString(ary[j]));
        }
        return sb.append(']').toString();
    }
    /** Convert an integer array to JSON text.
     * <p>patched by tomyeh
     */
    public static String toJSONString(int[] ary) {
        if (ary == null)
            return "null";

        final StringBuffer sb = new StringBuffer().append('[');
        for (int j = 0; j < ary.length; j++) {
            if (j > 0) sb.append(',');
            sb.append(JSONValue.toJSONString(ary[j]));
        }
        return sb.append(']').toString();
    }
    /** Convert a long array to JSON text.
     * <p>patched by tomyeh
     */
    public static String toJSONString(long[] ary) {
        if (ary == null)
            return "null";

        final StringBuffer sb = new StringBuffer().append('[');
        for (int j = 0; j < ary.length; j++) {
            if (j > 0) sb.append(',');
            sb.append(JSONValue.toJSONString(ary[j]));
        }
        return sb.append(']').toString();
    }
    /** Convert a short array to JSON text.
     * <p>patched by tomyeh
     */
    public static String toJSONString(short[] ary) {
        if (ary == null)
            return "null";

        final StringBuffer sb = new StringBuffer().append('[');
        for (int j = 0; j < ary.length; j++) {
            if (j > 0) sb.append(',');
            sb.append(JSONValue.toJSONString(ary[j]));
        }
        return sb.append(']').toString();
    }
    /** Convert a float array to JSON text.
     * <p>patched by tomyeh
     */
    public static String toJSONString(float[] ary) {
        if (ary == null)
            return "null";

        final StringBuffer sb = new StringBuffer().append('[');
        for (int j = 0; j < ary.length; j++) {
            if (j > 0) sb.append(',');
            sb.append(JSONValue.toJSONString(ary[j]));
        }
        return sb.append(']').toString();
    }
    /** Convert a double array to JSON text.
     * <p>patched by tomyeh
     */
    public static String toJSONString(double[] ary) {
        if (ary == null)
            return "null";

        final StringBuffer sb = new StringBuffer().append('[');
        for (int j = 0; j < ary.length; j++) {
            if (j > 0) sb.append(',');
            sb.append(JSONValue.toJSONString(ary[j]));
        }
        return sb.append(']').toString();
    }
    /** Convert a byte array to JSON text.
     * <p>patched by tomyeh
     */
    public static String toJSONString(byte[] ary) {
        if (ary == null)
            return "null";

        final StringBuffer sb = new StringBuffer().append('[');
        for (int j = 0; j < ary.length; j++) {
            if (j > 0) sb.append(',');
            sb.append(JSONValue.toJSONString(ary[j]));
        }
        return sb.append(']').toString();
    }
    /** Convert a boolean array to JSON text.
     * <p>patched by tomyeh
     */
    public static String toJSONString(boolean[] ary) {
        if (ary == null)
            return "null";

        final StringBuffer sb = new StringBuffer().append('[');
        for (int j = 0; j < ary.length; j++) {
            if (j > 0) sb.append(',');
            sb.append(JSONValue.toJSONString(ary[j]));
        }
        return sb.append(']').toString();
    }
    /** Convert a char array to JSON text.
     * <p>patched by tomyeh
     */
    public static String toJSONString(char[] ary) {
        if (ary == null)
            return "null";

        final StringBuffer sb = new StringBuffer().append('[');
        for (int j = 0; j < ary.length; j++) {
            if (j > 0) sb.append(',');
            sb.append(JSONValue.toJSONString(ary[j]));
        }
        return sb.append(']').toString();
    }

    /** Encodes this object to a JSON string.
     * It is the same as {@link #toString()}.
     */    
    public String toJSONString(){
        return toJSONString(this);
    }
    
    /** Encodes this object to a JSON string.
     * It is the same as {@link #toJSONString()}.
     */    
    public String toString() {
        return toJSONString();
    }
}