org.pentaho.osgi.i18n.webservice.ResourceBundleMessageBodyWriter.java Source code

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Here is the source code for org.pentaho.osgi.i18n.webservice.ResourceBundleMessageBodyWriter.java

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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2014 by Pentaho : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * 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 org.pentaho.osgi.i18n.webservice;

import org.json.simple.JSONObject;
import org.w3c.dom.Document;
import org.w3c.dom.Node;

import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.ResourceBundle;

/**
 * Created by bryan on 9/5/14.
 */
@Provider
@Produces({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON })
public class ResourceBundleMessageBodyWriter implements MessageBodyWriter<ResourceBundle> {

    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return ResourceBundle.class.isAssignableFrom(type) && (MediaType.APPLICATION_JSON_TYPE.equals(mediaType)
                || MediaType.APPLICATION_XML_TYPE.equals(mediaType));
    }

    @Override
    public long getSize(ResourceBundle resourceBundle, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType) {
        return -1;
    }

    @Override
    public void writeTo(ResourceBundle resourceBundle, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
            throws IOException, WebApplicationException {
        if (MediaType.APPLICATION_JSON_TYPE.equals(mediaType)) {
            JSONObject resourceBundleJsonObject = new JSONObject();
            for (String key : Collections.list(resourceBundle.getKeys())) {
                resourceBundleJsonObject.put(key, resourceBundle.getString(key));
            }
            OutputStreamWriter outputStreamWriter = null;
            try {
                outputStreamWriter = new OutputStreamWriter(entityStream);
                resourceBundleJsonObject.writeJSONString(outputStreamWriter);
            } finally {
                if (outputStreamWriter != null) {
                    outputStreamWriter.flush();
                }
            }
        } else if (MediaType.APPLICATION_XML_TYPE.equals(mediaType)) {
            try {
                Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
                Node propertiesNode = document.createElement("properties");
                document.appendChild(propertiesNode);
                for (String key : Collections.list(resourceBundle.getKeys())) {
                    Node propertyNode = document.createElement("property");
                    propertiesNode.appendChild(propertyNode);

                    Node keyNode = document.createElement("key");
                    keyNode.setTextContent(key);
                    propertyNode.appendChild(keyNode);

                    Node valueNode = document.createElement("value");
                    valueNode.setTextContent(resourceBundle.getString(key));
                    propertyNode.appendChild(valueNode);
                }
                Result output = new StreamResult(entityStream);
                Source input = new DOMSource(document);
                try {
                    Transformer transformer = TransformerFactory.newInstance().newTransformer();
                    transformer.setOutputProperty(OutputKeys.INDENT, "yes");
                    transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
                    transformer.transform(input, output);
                } catch (TransformerException e) {
                    throw new IOException(e);
                }
            } catch (ParserConfigurationException e) {
                throw new WebApplicationException(e);
            }
        }
    }
}