001/*
002 * (C) Copyright 2014 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 *     vpasquier
019 */
020package org.nuxeo.ecm.webengine.app;
021
022import java.io.IOException;
023import java.io.OutputStream;
024
025import javax.ws.rs.core.MediaType;
026
027import org.codehaus.jackson.JsonEncoding;
028import org.codehaus.jackson.JsonFactory;
029import org.codehaus.jackson.JsonGenerator;
030import org.nuxeo.ecm.webengine.JsonFactoryManager;
031import org.nuxeo.ecm.webengine.WebException;
032import org.nuxeo.runtime.api.Framework;
033
034/**
035 * @since 6.0
036 */
037public class JsonWebengineWriter {
038
039    static JsonFactoryManager jsonFactoryManager;
040
041    private static JsonFactory getFactory() {
042        jsonFactoryManager = Framework.getLocalService(JsonFactoryManager.class);
043        return jsonFactoryManager.getJsonFactory();
044    }
045
046    private static JsonGenerator createGenerator(OutputStream out) throws IOException {
047        return getFactory().createJsonGenerator(out, JsonEncoding.UTF8);
048    }
049
050    public static void writeException(OutputStream out, WebException webException, MediaType mediaType)
051            throws IOException {
052        writeException(createGenerator(out), webException, mediaType);
053    }
054
055    public static void writeException(JsonGenerator jg, WebException webException, MediaType mediaType)
056            throws IOException {
057        jg.writeStartObject();
058        jg.writeStringField("entity-type", "exception");
059        jg.writeStringField("code", webException.getType());
060        jg.writeNumberField("status", webException.getStatus());
061        // jg.writeStringField("help_url", eh.getHelpUrl());
062        // jg.writeStringField("request_id", eh.getRequestId());
063        jg.writeStringField("message", webException.getMessage());
064        if (jsonFactoryManager.isStackDisplay()
065                || MediaType.valueOf(MediaType.APPLICATION_JSON + "+nxentity").equals(mediaType)) {
066            jg.writeStringField("stacktrace", webException.getStackTraceString());
067            jg.writeObjectField("exception", webException.getCause());
068        }
069        jg.writeEndObject();
070        jg.flush();
071    }
072
073}