org.json.XMLToJson.java Source code

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Here is the source code for org.json.XMLToJson.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.json;

import java.io.File;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.Scanner;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;

public class XMLToJson {

    static Transformer transformer = null;
    static String transformerURL = null;
    static final String xsltFile = java.io.File.separator + "xsl" + java.io.File.separator + "XMLToJson.xsl";

    private Gson gson = new GsonBuilder().disableHtmlEscaping().setPrettyPrinting().create();
    JsonParser jp = new JsonParser();

    public XMLToJson(String basePath) {
        String base = basePath + xsltFile;
        if (transformer == null || (base != transformerURL)) {
            transformerURL = base;
            TransformerFactory tFactory = TransformerFactory.newInstance();
            try {
                transformer = tFactory.newTransformer(new StreamSource(transformerURL));
            } catch (TransformerConfigurationException e) {
                System.err.println("Unable to load transformation: " + transformerURL);
            }
        }
    }

    public String toJson(String xml) {
        StringWriter json = new StringWriter();
        if (transformer == null)
            return "Missing transformer: " + transformerURL;
        try {
            transformer.transform(new StreamSource(new StringReader(xml)), new StreamResult(json));
        } catch (TransformerException e) {
            return "Transformer exception: " + e.getLocalizedMessage();
        }
        return prettify(json.toString());
    }

    private String prettify(String json) {
        try {
            return gson.toJson(jp.parse(json));
        } catch (JsonSyntaxException e) {
            return json;
        }

    }

    public static void main(String[] args) throws TransformerException, IOException {
        Scanner scanner = new Scanner(new File(args[0]));
        scanner.useDelimiter("\\Z");
        System.out.println(new XMLToJson(null).toJson(scanner.next()).toString());
        scanner.close();
    }
}