/*
* 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
*
* https://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.tools.ant.taskdefs.compilers;
import java.io.File;
import java.io.IOException;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.condition.Os;
import org.apache.tools.ant.types.Commandline;
import org.apache.tools.ant.util.FileUtils;
import org.apache.tools.ant.util.JavaEnvUtils;
Performs a compile using javac externally.
Since: Ant 1.4
/**
* Performs a compile using javac externally.
*
* @since Ant 1.4
*/
public class JavacExternal extends DefaultCompilerAdapter {
Performs a compile using the Javac externally.
Throws: - BuildException – on error
Returns: true if the compilation succeeded
/**
* Performs a compile using the Javac externally.
* @return true if the compilation succeeded
* @throws BuildException on error
*/
@Override
public boolean execute() throws BuildException {
attributes.log("Using external javac compiler", Project.MSG_VERBOSE);
Commandline cmd = new Commandline();
cmd.setExecutable(getJavac().getJavacExecutable());
if (assumeJava1_3Plus()) {
setupModernJavacCommandlineSwitches(cmd);
} else {
setupJavacCommandlineSwitches(cmd, true);
}
int openVmsFirstFileName = assumeJava1_2Plus() ? cmd.size() : -1;
logAndAddFilesToCompile(cmd);
//On VMS platform, we need to create a special java options file
//containing the arguments and classpath for the javac command.
//The special file is supported by the "-V" switch on the VMS JVM.
if (Os.isFamily("openvms")) {
return execOnVMS(cmd, openVmsFirstFileName);
}
String[] commandLine = cmd.getCommandline();
int firstFileName;
if (assumeJava1_2Plus()) {
firstFileName = moveJOptionsToBeginning(commandLine);
} else {
firstFileName = -1;
}
return executeExternalCompile(commandLine, firstFileName,
true)
== 0;
}
Moves all -J arguments to the beginning
So that all command line arguments could be written to file, but -J
As per javac documentation:
you can specify one or more files that contain arguments to the javac command (except -J options)
Params: - commandLine – command line to process
Returns: int index of first non -J argument
/**
* Moves all -J arguments to the beginning
* So that all command line arguments could be written to file, but -J
* As per javac documentation:
* you can specify one or more files that contain arguments to the javac command (except -J options)
* @param commandLine command line to process
* @return int index of first non -J argument
*/
private int moveJOptionsToBeginning(String[] commandLine) {
int nonJArgumentIdx = 1; // 0 for javac executable
while(nonJArgumentIdx < commandLine.length && commandLine[nonJArgumentIdx].startsWith("-J")) {
nonJArgumentIdx++;
}
for(int i = nonJArgumentIdx + 1; i < commandLine.length; i++) {
if (commandLine[i].startsWith("-J")) {
String jArgument = commandLine[i];
for(int j = i - 1; j >= nonJArgumentIdx; j--) {
commandLine[j + 1] = commandLine[j];
}
commandLine[nonJArgumentIdx] = jArgument;
nonJArgumentIdx++;
}
}
return nonJArgumentIdx;
}
helper method to execute our command on VMS.
Params: - cmd – Commandline
- firstFileName – int
Returns: boolean
/**
* helper method to execute our command on VMS.
* @param cmd Commandline
* @param firstFileName int
* @return boolean
*/
private boolean execOnVMS(Commandline cmd, int firstFileName) {
File vmsFile = null;
try {
vmsFile = JavaEnvUtils.createVmsJavaOptionFile(cmd.getArguments());
String[] commandLine = {cmd.getExecutable(),
"-V",
vmsFile.getPath()};
return 0 == executeExternalCompile(commandLine,
firstFileName,
true);
} catch (IOException e) {
throw new BuildException(
"Failed to create a temporary file for \"-V\" switch");
} finally {
FileUtils.delete(vmsFile);
}
}
}