Apache CXF example source code file (JavascriptQueryHandler.java)

This example Apache CXF source code file (JavascriptQueryHandler.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

annotation, endpointinfo, endpointinfo, io, javascriptqueryhandler, js_utils_path, map, map, namespaceprefixaccumulator, net, network, runtimeexception, servicejavascriptbuilder, string, string, uri, uri, utf8, util

The Apache CXF JavascriptQueryHandler.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.javascript;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Map;

import javax.annotation.Resource;

import org.apache.cxf.Bus;
import org.apache.cxf.common.i18n.UncheckedException;
import org.apache.cxf.common.injection.NoJSR250Annotations;
import org.apache.cxf.endpoint.Endpoint;
import org.apache.cxf.endpoint.Server;
import org.apache.cxf.endpoint.ServerRegistry;
import org.apache.cxf.javascript.service.ServiceJavascriptBuilder;
import org.apache.cxf.javascript.types.SchemaJavascriptBuilder;
import org.apache.cxf.service.model.EndpointInfo;
import org.apache.cxf.service.model.SchemaInfo;
import org.apache.cxf.service.model.ServiceInfo;
import org.apache.cxf.transport.DestinationWithEndpoint;
import org.apache.cxf.transport.http.UrlUtilities;
import org.apache.cxf.transports.http.QueryHandlerRegistry;
import org.apache.cxf.transports.http.StemMatchingQueryHandler;

@NoJSR250Annotations(unlessNull = "bus")
public class JavascriptQueryHandler implements StemMatchingQueryHandler {
    private static final String JS_UTILS_PATH = "/org/apache/cxf/javascript/cxf-utils.js";
    private static final Charset UTF8 = Charset.forName("utf-8");
    private static final String NO_UTILS_QUERY_KEY = "nojsutils";
    private static final String CODE_QUERY_KEY = "js";
    private Bus bus;

    public JavascriptQueryHandler(Bus b) {
        setBus(b);
    }
    
    @Resource
    public final void setBus(Bus b) {
        if (bus != b) {
            bus = b;
            QueryHandlerRegistry reg = b.getExtension(QueryHandlerRegistry.class);
            if (reg != null) {
                reg.registerHandler(this);
            }
        }
    }
    
    public String getResponseContentType(String fullQueryString, String ctx) {
        URI uri = URI.create(fullQueryString);
        Map<String, String> map = UrlUtilities.parseQueryString(uri.getQuery());
        if (map.containsKey(CODE_QUERY_KEY)) {
            return "application/javascript;charset=UTF-8";
        }
        return null;
    }

    public boolean isRecognizedQuery(String baseUri, String ctx, EndpointInfo endpointInfo,
                                     boolean contextMatchExact) {
        if (baseUri == null) {
            return false;
        }
        URI uri = URI.create(baseUri);
        Map<String, String> map = UrlUtilities.parseQueryString(uri.getQuery());
        if (map.containsKey(CODE_QUERY_KEY)) {
            return endpointInfo.getAddress().contains(UrlUtilities.getStem(uri.getSchemeSpecificPart()));
        }
        return false;
    }
    
    public static void writeUtilsToResponseStream(Class<?> referenceClass, OutputStream outputStream) {
        InputStream utils = referenceClass.getResourceAsStream(JS_UTILS_PATH);
        if (utils == null) {
            throw new RuntimeException("Unable to get stream for " + JS_UTILS_PATH);
        }
        // it's amazing that this still has to be coded up.
        byte buffer[] = new byte[1024];
        int count;
        try {
            while ((count = utils.read(buffer, 0, 1024)) > 0) {
                outputStream.write(buffer, 0, count);
            }
            outputStream.flush();
        } catch (IOException e) {
            throw new RuntimeException("Failed to write javascript utils to HTTP response.", e);
        }
    }
    
    private Endpoint findEndpoint(EndpointInfo endpointInfo) {
        ServerRegistry serverRegistry = bus.getExtension(ServerRegistry.class);
        for (Server server : serverRegistry.getServers()) {
            // Hypothetically, not all destinations have an endpoint.
            // There has to be a better way to do this.
            if (server.getDestination() instanceof DestinationWithEndpoint
                &&
                endpointInfo.
                    equals(((DestinationWithEndpoint)server.getDestination()).getEndpointInfo())) {
                return server.getEndpoint();
            }
        }
        return null;
    }

    public void writeResponse(String fullQueryString, String ctx, EndpointInfo endpoint, OutputStream os) {
        URI uri = URI.create(fullQueryString);
        String query = uri.getQuery();
        Map<String, String> map = UrlUtilities.parseQueryString(query);
        OutputStreamWriter writer = new OutputStreamWriter(os, UTF8);
        if (!map.containsKey(NO_UTILS_QUERY_KEY)) {
            writeUtilsToResponseStream(JavascriptQueryHandler.class, os);
        } 
        if (map.containsKey(CODE_QUERY_KEY)) {
            ServiceInfo serviceInfo = endpoint.getService();
            Collection<SchemaInfo> schemata = serviceInfo.getSchemas();
            Endpoint serverEndpoint = findEndpoint(endpoint);
            // we need to move this to the bus.
            BasicNameManager nameManager = BasicNameManager.newNameManager(serviceInfo, serverEndpoint);
            NamespacePrefixAccumulator prefixManager = new NamespacePrefixAccumulator(serviceInfo
                .getXmlSchemaCollection());
            try {
                for (SchemaInfo schema : schemata) {
                    SchemaJavascriptBuilder builder = new SchemaJavascriptBuilder(serviceInfo
                        .getXmlSchemaCollection(), prefixManager, nameManager);
                    String allThatJavascript = builder.generateCodeForSchema(schema.getSchema());
                    writer.append(allThatJavascript);
                }

                ServiceJavascriptBuilder serviceBuilder = new ServiceJavascriptBuilder(serviceInfo,
                                                                                       endpoint.getAddress(),
                                                                                       prefixManager,
                                                                                       nameManager);
                serviceBuilder.walk();
                String serviceJavascript = serviceBuilder.getCode();
                writer.append(serviceJavascript);
                writer.flush();
            } catch (IOException e) {
                throw new UncheckedException(e);
            }
        } else {
            throw new RuntimeException("Invalid query " + fullQueryString);
        }
    }

    public boolean isRecognizedQuery(String fullQueryString, String ctx, EndpointInfo endpoint) {
        return isRecognizedQuery(fullQueryString, ctx, endpoint, false);
    }
}