/**
* 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);
}
/** Restores default class loader. */
protected void restoreClassloader() {
ClassLoader classLoader = getClass().getClassLoader();
if (classLoader instanceof AntClassLoader && savedClasspath != null) {
AntClassLoader antClassLoader = (AntClassLoader) classLoader;
antClassLoader.setClassPath(new Path(getProject(), savedClasspath));
savedClasspath = null;
}
}