ActiveMQ example source code file (MultiSourceGenerator.java)

This example ActiveMQ source code file (MultiSourceGenerator.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 - ActiveMQ tags/keywords

exception, exception, file, file, fixcrlf, io, jclass, jclass, list, multisourcegenerator, object, printwriter, project, string, string, util

The ActiveMQ MultiSourceGenerator.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.activemq.openwire.tool;

import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.FixCRLF;
import org.codehaus.jam.JClass;
import org.codehaus.jam.JProperty;
import org.codehaus.jam.JamClassIterator;

/**
 * 
 */
public abstract class MultiSourceGenerator extends OpenWireGenerator {
    protected Set<String> manuallyMaintainedClasses = new HashSet();
    protected File destDir;
    protected File destFile;

    protected JClass jclass;
    protected JClass superclass;
    protected String simpleName;
    protected String className;
    protected String baseClass;
    protected StringBuffer buffer;

    public MultiSourceGenerator() {
        initialiseManuallyMaintainedClasses();
    }

    public Object run() {
        if (destDir == null) {
            throw new IllegalArgumentException("No destDir defined!");
        }
        System.out.println(getClass().getName() + " generating files in: " + destDir);
        destDir.mkdirs();
        buffer = new StringBuffer();

        JamClassIterator iter = getClasses();
        while (iter.hasNext()) {
            try {
                jclass = iter.nextClass();
                if (isValidClass(jclass)) {
                    processClass(jclass);
                }
            } catch (Exception e) {
                System.err.println("Unable to process: " + jclass);
                e.printStackTrace();
            }
        }
        return null;
    }

    /**
     * Returns all the valid properties available on the current class
     */
    public List<JProperty> getProperties() {
        List<JProperty> answer = new ArrayList();
        JProperty[] properties = jclass.getDeclaredProperties();
        for (int i = 0; i < properties.length; i++) {
            JProperty property = properties[i];
            if (isValidProperty(property)) {
                answer.add(property);
            }
        }
        return answer;
    }

    protected boolean isValidClass(JClass jclass) {
        if (jclass.getAnnotation("openwire:marshaller") == null) {
            return false;
        }
        return !manuallyMaintainedClasses.contains(jclass.getSimpleName());
    }

    protected void processClass(JClass jclass) {
        simpleName = jclass.getSimpleName();
        superclass = jclass.getSuperclass();

        System.out.println(getClass().getName() + " processing class: " + simpleName);

        className = getClassName(jclass);

        destFile = new File(destDir, className + filePostFix);

        baseClass = getBaseClassName(jclass);

        PrintWriter out = null;
        try {
            out = new PrintWriter(new FileWriter(destFile));
            generateFile(out);
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            if (out != null) {
                out.close();
            }
        }

        // Use the FixCRLF Ant Task to make sure the file has consistent
        // newlines
        // so that SVN does not complain on checkin.
        Project project = new Project();
        project.init();
        FixCRLF fixCRLF = new FixCRLF();
        fixCRLF.setProject(project);
        fixCRLF.setSrcdir(destFile.getParentFile());
        fixCRLF.setIncludes(destFile.getName());
        fixCRLF.execute();
    }

    protected abstract void generateFile(PrintWriter out) throws Exception;

    protected String getBaseClassName(JClass jclass) {
        String answer = "BaseDataStructure";
        if (superclass != null) {
            String name = superclass.getSimpleName();
            if (name != null && !name.equals("Object")) {
                answer = name;
            }
        }
        return answer;
    }

    protected String getClassName(JClass jclass) {
        return jclass.getSimpleName();
    }

    public boolean isAbstractClass() {
        return jclass != null && jclass.isAbstract();
    }

    public String getAbstractClassText() {
        return isAbstractClass() ? "abstract " : "";
    }

    public boolean isMarshallerAware() {
        return isMarshallAware(jclass);
    }

    protected void initialiseManuallyMaintainedClasses() {
        String[] names = {
            "ActiveMQDestination", "ActiveMQTempDestination", "ActiveMQQueue", "ActiveMQTopic", "ActiveMQTempQueue", "ActiveMQTempTopic", "BaseCommand", "ActiveMQMessage", "ActiveMQTextMessage",
            "ActiveMQMapMessage", "ActiveMQBytesMessage", "ActiveMQStreamMessage", "ActiveMQBlobMessage", "DataStructureSupport", "WireFormatInfo", "ActiveMQObjectMessage"
        };

        for (int i = 0; i < names.length; i++) {
            manuallyMaintainedClasses.add(names[i]);
        }
    }

    public String getBaseClass() {
        return baseClass;
    }

    public void setBaseClass(String baseClass) {
        this.baseClass = baseClass;
    }

    public String getClassName() {
        return className;
    }

    public void setClassName(String className) {
        this.className = className;
    }

    public File getDestDir() {
        return destDir;
    }

    public void setDestDir(File destDir) {
        this.destDir = destDir;
    }

    public File getDestFile() {
        return destFile;
    }

    public void setDestFile(File destFile) {
        this.destFile = destFile;
    }

    public JClass getJclass() {
        return jclass;
    }

    public void setJclass(JClass jclass) {
        this.jclass = jclass;
    }

    public Set<String> getManuallyMaintainedClasses() {
        return manuallyMaintainedClasses;
    }

    public void setManuallyMaintainedClasses(Set<String> manuallyMaintainedClasses) {
        this.manuallyMaintainedClasses = manuallyMaintainedClasses;
    }

    public String getSimpleName() {
        return simpleName;
    }

    public void setSimpleName(String simpleName) {
        this.simpleName = simpleName;
    }

    public JClass getSuperclass() {
        return superclass;
    }

    public void setSuperclass(JClass superclass) {
        this.superclass = superclass;
    }

}