/*

 * 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.xerces.util;

import org.apache.tools.ant.BuildException;

import org.apache.tools.ant.Project;

import org.apache.tools.ant.types.Path;

import org.apache.tools.ant.util.JavaEnvUtils;

import org.apache.tools.ant.taskdefs.Javac;

import java.lang.StringBuffer;

import java.util.Properties;

import java.util.Locale;

/**

 * The implementation of the javac compiler for JDK 1.4 and above

 *

 * The purpose of this task is to diagnose whether we're

 * running on a 1.4 or above JVM; if we are, to

 * set up the bootclasspath such that the build will

 * succeed; if we aren't, then invoke the Javac12

 * task.

 *

 * @author Neil Graham, IBM

 */

public class XJavac extends Javac {

    /**

     * Run the compilation.

     *

     * @exception BuildException if the compilation has problems.

     */

    public void execute() throws BuildException {

        if(isJDK14OrHigher()) {

            // maybe the right one; check vendor:

            // by checking system properties:

            Properties props = null;

            try {

                props = System.getProperties();

            } catch (Exception e) {

                throw new BuildException("unable to determine java vendor because could not access system properties!");

            }

            // this is supposed to be provided by all JVM's from time immemorial

            String vendor = ((String)props.get("java.vendor")).toUpperCase(Locale.ENGLISH);

            if (vendor.indexOf("IBM") >= 0) {

                // we're on an IBM 1.4 or higher; fiddle with the bootclasspath.

                setBootclasspath(createIBMJDKBootclasspath());

            }

            // need to do special things for Sun too and also

            // for Apple, HP, FreeBSD, SableVM, Kaffe and Blackdown: a Linux port of Sun Java

            else if( (vendor.indexOf("SUN") >= 0) || 

                     (vendor.indexOf("BLACKDOWN") >= 0) || 

                     (vendor.indexOf("APPLE") >= 0) ||

                     (vendor.indexOf("HEWLETT-PACKARD") >= 0) ||

                     (vendor.indexOf("KAFFE") >= 0) ||

                     (vendor.indexOf("SABLE") >= 0) ||

                     (vendor.indexOf("FREEBSD") >= 0)) {

                // we're on an SUN 1.4 or higher; fiddle with the bootclasspath.

                // since we can't eviscerate XML-related info here,

                // we must use the classpath

                Path bcp = createBootclasspath();

                Path clPath = getClasspath();

                bcp.append(clPath);

                String currBCP = (String)props.get("sun.boot.class.path");

                Path currBCPath = new Path(null); 

                currBCPath.createPathElement().setPath(currBCP);

                bcp.append(currBCPath);

                setBootclasspath(bcp);

            }

        }

        // now just do the normal thing:

        super.execute();

    }

    /**

     * Creates bootclasspath for IBM JDK 1.4 and above.

     */

    private Path createIBMJDKBootclasspath() {

        Path bcp = createBootclasspath();

        String javaHome = System.getProperty("java.home");

        StringBuffer bcpMember = new StringBuffer();

        bcpMember.append(javaHome).append("/lib/charsets.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(), "/lib/core.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(), "/lib/vm.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(), "/lib/java.util.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(), "/lib/rt.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/graphics.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/javaws.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/jaws.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/security.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/server.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/ext/JawBridge.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/ext/gskikm.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/ext/ibmjceprovider.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/ext/indicim.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/ext/jaccess.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/ext/ldapsec.jar:");

        bcp.createPathElement().setPath(bcpMember.toString());

        bcpMember.replace(javaHome.length(), bcpMember.length(),  "/lib/ext/oldcertpath.jar");

        bcp.createPathElement().setPath(bcpMember.toString());

        return bcp;

    }

    /**

     * Checks whether the JDK version is 1.4 or higher. If it's not

     * JDK 1.4 we check whether we're on a future JDK by checking

     * that we're not on JDKs 1.0, 1.1, 1.2 or 1.3. This check by 

     * exclusion should future proof this task from new versions of 

     * Ant which are aware of higher JDK versions.

     * 

     * @return true if the JDK version is 1.4 or higher.

     */

    private boolean isJDK14OrHigher() {

        final String version = JavaEnvUtils.getJavaVersion();

        return version.equals(JavaEnvUtils.JAVA_1_4) ||

            (!version.equals(JavaEnvUtils.JAVA_1_3) &&

            !version.equals(JavaEnvUtils.JAVA_1_2) &&

            !version.equals(JavaEnvUtils.JAVA_1_1) &&

            !version.equals(JavaEnvUtils.JAVA_1_0));

    }

}