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Apache CXF example source code file (AegisJSONProvider.java)

This example Apache CXF source code file (AegisJSONProvider.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Apache CXF tags/keywords

aegisjsonprovider, annotation, concurrenthashmap, concurrenthashmap, dom, exception, io, mediatype, override, override, reflection, string, string, threading, threads, type, util, w3cdomstreamwriter, xmlstreamwriter, xmlstreamwriter

The Apache CXF AegisJSONProvider.java source code

/**
 * 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.apache.cxf.jaxrs.provider;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import javax.ws.rs.Consumes;
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.Provider;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.w3c.dom.Document;

import org.apache.cxf.aegis.AegisContext;
import org.apache.cxf.aegis.AegisWriter;
import org.apache.cxf.aegis.type.AegisType;
import org.apache.cxf.staxutils.StaxUtils;
import org.apache.cxf.staxutils.W3CDOMStreamWriter;
import org.codehaus.jettison.mapped.Configuration;

@Provider
@Produces({"application/json" })
@Consumes({"application/json" })
public final class AegisJSONProvider<T> extends AegisElementProvider {

    private List<String> arrayKeys;
    private boolean serializeAsArray;
    private boolean dropRootElement;
    private boolean ignoreNamespaces;
        
    private ConcurrentHashMap<String, String> namespaceMap = new ConcurrentHashMap();

    public AegisJSONProvider() {
    }

    public void setIgnoreNamespaces(boolean ignoreNamespaces) {
        this.ignoreNamespaces = ignoreNamespaces;
    }
    
    public void setDropRootElement(boolean dropRootElement) {
        this.dropRootElement = dropRootElement;
    }

    public void setArrayKeys(List<String> keys) {
        this.arrayKeys = keys;
    }

    public void setSerializeAsArray(boolean asArray) {
        this.serializeAsArray = asArray;
    }

    @Override
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mt) {
        return true;
    }

    public void setNamespaceMap(Map<String, String> nsMap) {
        this.namespaceMap = new ConcurrentHashMap<String, String>(nsMap);
    }

    @Override
    public void writeTo(T obj, Class<?> type, Type genericType, Annotation[] anns, MediaType m,
                        MultivaluedMap<String, Object> headers, OutputStream os) throws IOException {
        if (type == null) {
            type = obj.getClass();
        }
        if (genericType == null) {
            genericType = type;
        }
        AegisContext context = getAegisContext(type, genericType);
        AegisType aegisType = context.getTypeMapping().getType(genericType);
        AegisWriter<XMLStreamWriter> aegisWriter = context.createXMLStreamWriter();
        try {
            W3CDOMStreamWriter w3cStreamWriter = new W3CDOMStreamWriter();
            XMLStreamWriter spyingWriter = new PrefixCollectingXMLStreamWriter(w3cStreamWriter,
                                                                               namespaceMap);
            spyingWriter.writeStartDocument();
            // use type qname as element qname?
            aegisWriter.write(obj, aegisType.getSchemaType(), false, spyingWriter, aegisType);
            spyingWriter.writeEndDocument();
            spyingWriter.close();
            Document dom = w3cStreamWriter.getDocument();
            // ok, now the namespace map has all the prefixes.
            
            XMLStreamWriter xmlStreamWriter = createStreamWriter(aegisType.getSchemaType(), os);
            xmlStreamWriter.writeStartDocument();
            StaxUtils.copy(dom, xmlStreamWriter);
            // Jettison needs, and StaxUtils.copy doesn't do it.
            xmlStreamWriter.writeEndDocument();
            xmlStreamWriter.flush();
            xmlStreamWriter.close();
        } catch (Exception e) {
            throw new WebApplicationException(e);
        }
    }

    @Override
    protected XMLStreamWriter createStreamWriter(QName typeQName, OutputStream os) throws Exception {
        
        Configuration config = 
            JSONUtils.createConfiguration(namespaceMap, writeXsiType && !ignoreNamespaces, null);
        XMLStreamWriter writer = JSONUtils.createStreamWriter(os, typeQName, 
             writeXsiType && !ignoreNamespaces, config, serializeAsArray, arrayKeys, dropRootElement);
        return JSONUtils.createIgnoreNsWriterIfNeeded(writer, ignoreNamespaces);
    }

    @Override
    protected XMLStreamReader createStreamReader(AegisType typeToRead, InputStream is) throws Exception {
        // the namespace map. Oh, the namespace map.
        // This is wrong, but might make unit tests pass until we redesign.
        if (typeToRead != null) {
            namespaceMap.put(typeToRead.getSchemaType().getNamespaceURI(), "ns1");
        }
        return JSONUtils.createStreamReader(is, readXsiType, namespaceMap);
    }


}

Other Apache CXF examples (source code examples)

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