ActiveMQ example source code file (OpenWireGenerator.java)

This example ActiveMQ source code file (OpenWireGenerator.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

activemqmessage, bytesequence, jamclassiterator, jamservice, jamservice, jannotationvalue, jfield, jfield, jmethod, jmethod, openwiregenerator, string, string, wireformatinfo

The ActiveMQ OpenWireGenerator.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 org.codehaus.jam.JAnnotation;
import org.codehaus.jam.JAnnotationValue;
import org.codehaus.jam.JClass;
import org.codehaus.jam.JField;
import org.codehaus.jam.JMethod;
import org.codehaus.jam.JProperty;
import org.codehaus.jam.JamClassIterator;
import org.codehaus.jam.JamService;

/**
 * 
 */
public abstract class OpenWireGenerator {

    protected int openwireVersion;
    protected String filePostFix = ".java";
    protected JamService jam;

    public boolean isValidProperty(JProperty it) {
        JMethod getter = it.getGetter();
        return getter != null && it.getSetter() != null && !getter.isStatic() && getter.getAnnotation("openwire:property") != null;
    }

    public boolean isCachedProperty(JProperty it) {
        JMethod getter = it.getGetter();
        if (!isValidProperty(it)) {
            return false;
        }
        JAnnotationValue value = getter.getAnnotation("openwire:property").getValue("cache");
        return value != null && value.asBoolean();
    }

    public boolean isAbstract(JClass j) {
        JField[] fields = j.getFields();
        for (int i = 0; i < fields.length; i++) {
            JField field = fields[i];
            if (field.isStatic() && field.isPublic() && field.isFinal() && field.getSimpleName().equals("DATA_STRUCTURE_TYPE")) {
                return false;
            }
        }
        return true;
    }

    public boolean isThrowable(JClass j) {
        if (j.getQualifiedName().equals(Throwable.class.getName())) {
            return true;
        }
        return j.getSuperclass() != null && isThrowable(j.getSuperclass());
    }

    public boolean isMarshallAware(JClass j) {
        if (filePostFix.endsWith("java")) {
            JClass[] interfaces = j.getInterfaces();
            for (int i = 0; i < interfaces.length; i++) {
                if (interfaces[i].getQualifiedName().equals("org.apache.activemq.command.MarshallAware")) {
                    return true;
                }
            }
            return false;
        } else {
            String simpleName = j.getSimpleName();
            return simpleName.equals("ActiveMQMessage") || simpleName.equals("WireFormatInfo");
        }
        /*
         * else { // is it a message type String simpleName = j.getSimpleName();
         * JClass superclass = j.getSuperclass(); return
         * simpleName.equals("ActiveMQMessage") || (superclass != null &&
         * superclass.getSimpleName().equals("ActiveMQMessage")); }
         */
    }

    public JamService getJam() {
        return jam;
    }

    public JamClassIterator getClasses() {
        return getJam().getClasses();
    }

    public int getOpenwireVersion() {
        return openwireVersion;
    }

    public void setOpenwireVersion(int openwireVersion) {
        this.openwireVersion = openwireVersion;
    }

    /**
     * Converts the Java type to a C# type name
     */
    public String toCSharpType(JClass type) {
        String name = type.getSimpleName();
        if (name.equals("String")) {
            return "string";
        } else if (name.equals("Throwable") || name.equals("Exception")) {
            return "BrokerError";
        } else if (name.equals("ByteSequence")) {
            return "byte[]";
        } else if (name.equals("boolean")) {
            return "bool";
        } else {
            return name;
        }
    }

    public String getOpenWireOpCode(JClass element) {
        if (element != null) {
            JAnnotation annotation = element.getAnnotation("openwire:marshaller");
            return stringValue(annotation, "code", "0");
        }
        return "0";
    }

    protected String stringValue(JAnnotation annotation, String name) {
        return stringValue(annotation, name, null);
    }

    protected String stringValue(JAnnotation annotation, String name, String defaultValue) {
        if (annotation != null) {
            JAnnotationValue value = annotation.getValue(name);
            if (value != null) {
                return value.asString();
            }
        }
        return defaultValue;
    }

    public void setJam(JamService jam) {
        this.jam = jam;
    }

    public String decapitalize(String text) {
        if (text == null) {
            return null;
        }
        return text.substring(0, 1).toLowerCase() + text.substring(1);
    }

    public String capitalize(String text) {
        if (text == null) {
            return null;
        }
        return text.substring(0, 1).toUpperCase() + text.substring(1);
    }
}