/**
* Initializes default class loader. It inherits from classloader, which was used to load this
* task, therefore build-in classes and resources are loaded automatically.
*
* <p>Notice: task's classpath has priority over default classpath, therefore we are able to
* easily override resources (templates)
*/
protected void initClassloader() {
// NOTICE: we should use the same classloader, which was used to load this task
// otherwise we won't be able to cast instances
// (that were loaded via different class loaders)
// we are introducting workaround,
// that tries to add classpath for current task to original class loader
// and stores original classpath
// after the task is executed, classpath is restored
ClassLoader classLoader = getClass().getClassLoader();
if (classLoader instanceof AntClassLoader) {
// add defined classpath
AntClassLoader antClassLoader = (AntClassLoader) classLoader;
antClassLoader.setParentFirst(false);
antClassLoader.setProject(getProject());
savedClasspath = antClassLoader.getClasspath();
Path cp = getClasspath();
// add defined classpath to original path
cp.add(new Path(getProject(), savedClasspath));
antClassLoader.setClassPath(cp);
} else {
// create new class loader
classLoader =
new AntClassLoader(getClass().getClassLoader(), getProject(), getClasspath(), false);
}
// set this class loader as new class loader for whole thread
// ContextClassLoader is used in StringTemplate's PathGroupLoader and other classes
Thread.currentThread().setContextClassLoader(classLoader);
}
/**
* Main entry point for this task. It creates transformation specified by classname attribute,
* passes all parameters and executes it.
*
* @throws BuildException if an error occured
*/
@Override
public void execute() throws BuildException {
if (getClassname() == null) {
throw new BuildException("Classname of transformation is not set.");
}
if (getSrcFile() != null && getSrcDir() != null) {
throw new BuildException("Both srcFile and srcDir were set.");
}
if (getDestFile() != null && getDestDir() != null) {
throw new BuildException("Both destFile and destDir were set.");
}
if (!resources.isEmpty() && (getSrcFile() != null || getSrcDir() != null)) {
throw new BuildException("Resources can't be combined with srcFile or srcDir.");
}
initClassloader();
try {
TransformationLoader loader =
new TransformationLoader(Thread.currentThread().getContextClassLoader());
Transformation transObj = null;
try {
transObj = loader.getInstance(getClassname());
} catch (InstantiationException ex) {
throw new BuildException("Transformation couldn't be instanciated", ex);
} catch (IllegalAccessException ex) {
throw new BuildException("Transformation couldn't be accessed", ex);
}
if (transObj == null) {
throw new BuildException("Transformation " + getClassname() + " couldn't be loaded");
}
List<MappedFile> files = getMappedFiles();
if (files.isEmpty()) {
log(
"No files specified, " + transObj.getClass().getSimpleName() + " skipped",
Project.MSG_INFO);
return;
}
for (MappedFile mf : files) {
log("Mapped file " + mf.getFrom() + " to " + mf.getTo(), Project.MSG_VERBOSE);
}
transObj.setParam("baseDir", getProject().getBaseDir().getPath());
transObj.setMappedFiles(files);
transObj.setParams(parameters);
for (String key : parameters.keySet())
log(
"Parsed parameter "
+ key
+ " = "
+ parameters.get(key)
+ " ("
+ parameters.get(key).getClass().getName()
+ ")",
Project.MSG_VERBOSE);
try {
log(
"Executing transformation "
+ transObj.getClass().getSimpleName()
+ " on "
+ mappedFiles.size()
+ " files");
transObj.execute();
} catch (TransformationException ex) {
log("Transformation has failed", ex, Project.MSG_ERR);
if (isFailonerror()) {
throw new BuildException("Transformation has failed.", ex);
}
}
} finally {
restoreClassloader();
}
}
