Examples with Parameterizable org.apache.tools.ant.types.Parameterizable used on opensource projects

Example 1 with Parameterizable

use of org.apache.tools.ant.types.Parameterizable in project ant by apache.

the class ChainReaderHelper method expandReader.

/**
 * Creates and parameterizes a new FilterReader from a
 * <filterreader> element.
 *
 * @since Ant 1.8.0
 */
private Reader expandReader(final AntFilterReader filter, final Reader ancestor, final List<AntClassLoader> classLoadersToCleanUp) {
    final String className = filter.getClassName();
    final Path classpath = filter.getClasspath();
    if (className != null) {
        try {
            Class<? extends FilterReader> clazz;
            try {
                if (classpath == null) {
                    clazz = Class.forName(className).asSubclass(FilterReader.class);
                } else {
                    AntClassLoader al = filter.getProject().createClassLoader(classpath);
                    classLoadersToCleanUp.add(al);
                    clazz = Class.forName(className, true, al).asSubclass(FilterReader.class);
                }
            } catch (ClassCastException ex) {
                throw new BuildException("%s does not extend %s", className, FilterReader.class.getName());
            }
            Optional<Constructor<?>> ctor = Stream.of(clazz.getConstructors()).filter(c -> c.getParameterCount() == 1 && c.getParameterTypes()[0].isAssignableFrom(Reader.class)).findFirst();
            Object instream = ctor.orElseThrow(() -> new BuildException("%s does not define a public constructor that takes in a %s as its single argument.", className, Reader.class.getSimpleName())).newInstance(ancestor);
            setProjectOnObject(instream);
            if (Parameterizable.class.isAssignableFrom(clazz)) {
                ((Parameterizable) instream).setParameters(filter.getParams());
            }
            return (Reader) instream;
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | InvocationTargetException ex) {
            throw new BuildException(ex);
        }
    }
    // backwards compatibility makes it hard to change, though.
    return ancestor;
}