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ActiveMQ example source code file (CppClassesGenerator.java)

This example ActiveMQ source code file (CppClassesGenerator.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

bytesequence, bytesequence, command, datastructure, io, ioexception, iterator, iterator, jproperty, license, license, see, string, string, util, you

The ActiveMQ CppClassesGenerator.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.PrintWriter;
import java.util.Iterator;
import java.util.List;

import org.codehaus.jam.JClass;
import org.codehaus.jam.JProperty;

/**
 * 
 */
public class CppClassesGenerator extends MultiSourceGenerator {

    protected String targetDir = "./src/main/cpp";

    public Object run() {
        filePostFix = getFilePostFix();
        if (destDir == null) {
            destDir = new File(targetDir + "/activemq/command");
        }
        return super.run();
    }

    protected String getFilePostFix() {
        return ".cpp";
    }

    /**
     * Converts the Java type to a C++ type name
     */
    public String toCppType(JClass type) {
        String name = type.getSimpleName();
        if (name.equals("String")) {
            return "p<string>";
        } else if (type.isArrayType()) {
            if (name.equals("byte[]")) {
                name = "char[]";
            } else if (name.equals("DataStructure[]")) {
                name = "IDataStructure[]";
            }
            return "array<" + name.substring(0, name.length() - 2) + ">";
        } else if (name.equals("Throwable") || name.equals("Exception")) {
            return "p<BrokerError>";
        } else if (name.equals("ByteSequence")) {
            return "array<char>";
        } else if (name.equals("boolean")) {
            return "bool";
        } else if (name.equals("long")) {
            return "long long";
        } else if (name.equals("byte")) {
            return "char";
        } else if (name.equals("Command") || name.equals("DataStructure")) {
            return "p<I" + name + ">";
        } else if (!type.isPrimitiveType()) {
            return "p<" + name + ">";
        } else {
            return name;
        }
    }

    /**
     * Converts the Java type to a C++ default value
     */
    public String toCppDefaultValue(JClass type) {
        String name = type.getSimpleName();

        if (name.equals("boolean")) {
            return "false";
        } else if (!type.isPrimitiveType()) {
            return "NULL";
        } else {
            return "0";
        }
    }

    /**
     * Converts the Java type to the name of the C++ marshal method to be used
     */
    public String toMarshalMethodName(JClass type) {
        String name = type.getSimpleName();
        if (name.equals("String")) {
            return "marshalString";
        } else if (type.isArrayType()) {
            if (type.getArrayComponentType().isPrimitiveType() && name.equals("byte[]")) {
                return "marshalByteArray";
            } else {
                return "marshalObjectArray";
            }
        } else if (name.equals("ByteSequence")) {
            return "marshalByteArray";
        } else if (name.equals("short")) {
            return "marshalShort";
        } else if (name.equals("int")) {
            return "marshalInt";
        } else if (name.equals("long")) {
            return "marshalLong";
        } else if (name.equals("byte")) {
            return "marshalByte";
        } else if (name.equals("double")) {
            return "marshalDouble";
        } else if (name.equals("float")) {
            return "marshalFloat";
        } else if (name.equals("boolean")) {
            return "marshalBoolean";
        } else if (!type.isPrimitiveType()) {
            return "marshalObject";
        } else {
            return name;
        }
    }

    /**
     * Converts the Java type to the name of the C++ unmarshal method to be used
     */
    public String toUnmarshalMethodName(JClass type) {
        String name = type.getSimpleName();
        if (name.equals("String")) {
            return "unmarshalString";
        } else if (type.isArrayType()) {
            if (type.getArrayComponentType().isPrimitiveType() && name.equals("byte[]")) {
                return "unmarshalByteArray";
            } else {
                return "unmarshalObjectArray";
            }
        } else if (name.equals("ByteSequence")) {
            return "unmarshalByteArray";
        } else if (name.equals("short")) {
            return "unmarshalShort";
        } else if (name.equals("int")) {
            return "unmarshalInt";
        } else if (name.equals("long")) {
            return "unmarshalLong";
        } else if (name.equals("byte")) {
            return "unmarshalByte";
        } else if (name.equals("double")) {
            return "unmarshalDouble";
        } else if (name.equals("float")) {
            return "unmarshalFloat";
        } else if (name.equals("boolean")) {
            return "unmarshalBoolean";
        } else if (!type.isPrimitiveType()) {
            return "unmarshalObject";
        } else {
            return name;
        }
    }

    /**
     * Converts the Java type to a C++ pointer cast
     */
    public String toUnmarshalCast(JClass type) {
        String name = toCppType(type);

        if (name.startsWith("p<")) {
            return "p_cast<" + name.substring(2);
        } else if (name.startsWith("array<") && (type.isArrayType() && !type.getArrayComponentType().isPrimitiveType()) && !type.getSimpleName().equals("ByteSequence")) {
            return "array_cast<" + name.substring(6);
        } else {
            return "";
        }
    }

    protected void generateLicence(PrintWriter out) {
        out.println("/**");
        out.println(" * Licensed to the Apache Software Foundation (ASF) under one or more");
        out.println(" * contributor license agreements.  See the NOTICE file distributed with");
        out.println(" * this work for additional information regarding copyright ownership.");
        out.println(" * The ASF licenses this file to You under the Apache License, Version 2.0");
        out.println(" * (the \"License\"); you may not use this file except in compliance with");
        out.println(" * the License.  You may obtain a copy of the License at");
        out.println(" *");
        out.println(" *      http://www.apache.org/licenses/LICENSE-2.0");
        out.println(" *");
        out.println(" * Unless required by applicable law or agreed to in writing, software");
        out.println(" * distributed under the License is distributed on an \"AS IS\" BASIS,");
        out.println(" * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.");
        out.println(" * See the License for the specific language governing permissions and");
        out.println(" * limitations under the License.");
        out.println(" */");
    }

    protected void generateFile(PrintWriter out) throws Exception {
        generateLicence(out);
        out.println("#include \"activemq/command/" + className + ".hpp\"");
        out.println("");
        out.println("using namespace apache::activemq::command;");
        out.println("");
        out.println("/*");
        out.println(" *");
        out.println(" *  Command and marshalling code for OpenWire format for " + className + "");
        out.println(" *");
        out.println(" *");
        out.println(" *  NOTE!: This file is autogenerated - do not modify!");
        out.println(" *         if you need to make a change, please see the Groovy scripts in the");
        out.println(" *         activemq-core module");
        out.println(" *");
        out.println(" */");
        out.println("" + className + "::" + className + "()");
        out.println("{");

        List properties = getProperties();
        for (Iterator iter = properties.iterator(); iter.hasNext();) {
            JProperty property = (JProperty)iter.next();
            String value = toCppDefaultValue(property.getType());
            String propertyName = property.getSimpleName();
            String parameterName = decapitalize(propertyName);
            out.println("    this->" + parameterName + " = " + value + " ;");
        }
        out.println("}");
        out.println("");
        out.println("" + className + "::~" + className + "()");
        out.println("{");
        out.println("}");
        out.println("");
        out.println("unsigned char " + className + "::getDataStructureType()");
        out.println("{");
        out.println("    return " + className + "::TYPE ; ");
        out.println("}");
        for (Iterator iter = properties.iterator(); iter.hasNext();) {
            JProperty property = (JProperty)iter.next();
            String type = toCppType(property.getType());
            String propertyName = property.getSimpleName();
            String parameterName = decapitalize(propertyName);
            out.println("");
            out.println("        ");
            out.println("" + type + " " + className + "::get" + propertyName + "()");
            out.println("{");
            out.println("    return " + parameterName + " ;");
            out.println("}");
            out.println("");
            out.println("void " + className + "::set" + propertyName + "(" + type + " " + parameterName + ")");
            out.println("{");
            out.println("    this->" + parameterName + " = " + parameterName + " ;");
            out.println("}");
        }
        out.println("");
        out.println("int " + className + "::marshal(p<IMarshaller> marshaller, int mode, p ostream) throw (IOException)");
        out.println("{");
        out.println("    int size = 0 ;");
        out.println("");
        out.println("    size += " + baseClass + "::marshal(marshaller, mode, ostream) ; ");

        for (Iterator iter = properties.iterator(); iter.hasNext();) {
            JProperty property = (JProperty)iter.next();
            String marshalMethod = toMarshalMethodName(property.getType());
            String propertyName = decapitalize(property.getSimpleName());
            out.println("    size += marshaller->" + marshalMethod + "(" + propertyName + ", mode, ostream) ; ");
        }
        out.println("    return size ;");
        out.println("}");
        out.println("");
        out.println("void " + className + "::unmarshal(p<IMarshaller> marshaller, int mode, p istream) throw (IOException)");
        out.println("{");
        out.println("    " + baseClass + "::unmarshal(marshaller, mode, istream) ; ");
        for (Iterator iter = properties.iterator(); iter.hasNext();) {
            JProperty property = (JProperty)iter.next();
            String cast = toUnmarshalCast(property.getType());
            String unmarshalMethod = toUnmarshalMethodName(property.getType());
            String propertyName = decapitalize(property.getSimpleName());
            out.println("    " + propertyName + " = " + cast + "(marshaller->" + unmarshalMethod + "(mode, istream)) ; ");
        }
        out.println("}");
    }

    public String getTargetDir() {
        return targetDir;
    }

    public void setTargetDir(String targetDir) {
        this.targetDir = targetDir;
    }

}

Other ActiveMQ examples (source code examples)

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