jsontransformer.java

来自「resetful样式的ws样例,一种面向资源的webservices服务」· Java 代码 · 共 93 行

/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. 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 https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/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 jersey/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
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 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.jersey.impl.json;

import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Map;
import org.codehaus.jettison.json.JSONArray;
import org.codehaus.jettison.json.JSONException;
import org.codehaus.jettison.json.JSONObject;

/**
 *
 * @author ps23762
 */
final class JSONTransformer {
    @SuppressWarnings("unchecked")
    static <T> Map<String, T> asMap(String jsonObjectVal) throws JSONException {
        if (null == jsonObjectVal) {
            return null;
        }
        Map<String, T> result = new HashMap<String, T>();

        JSONObject sourceMap = new JSONObject(jsonObjectVal);
        Iterator<String> keyIterator = sourceMap.keys();
        while (keyIterator.hasNext()) {
            String key = keyIterator.next();
            result.put(key, (T)sourceMap.get(key));
        }
        return result;
    }
    
    
    @SuppressWarnings("unchecked")
    static <T> Collection<T> asCollection(String jsonArrayVal) throws JSONException {
        if (null == jsonArrayVal) {
            return null;
        }
        Collection<T> result = new LinkedList<T>();

        JSONArray arrayVal = new JSONArray(jsonArrayVal);
        for (int i = 0; i < arrayVal.length(); i++) {
            result.add((T)arrayVal.get(i));
        }
        return result;
    }
    
    static String asJsonArray(Collection<? extends Object> collection) {
        return (null == collection) ? "[]" : (new JSONArray(collection)).toString();
    }
    
    static String asJsonObject(Map map) {
        return (null == map) ? "{}" : (new JSONObject(map)).toString();
    }
}