/*
* Copyright 2009 the original author or authors.
*
* Licensed 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.gradle.api.internal.file.copy;
import groovy.lang.Closure;
import groovy.text.SimpleTemplateEngine;
import groovy.text.Template;
import org.apache.tools.ant.util.ReaderInputStream;
import org.gradle.api.InvalidUserDataException;
import org.gradle.api.Transformer;
import org.gradle.api.UncheckedIOException;
import org.gradle.api.internal.ChainingTransformer;
import org.gradle.util.ConfigureUtil;
import java.io.*;
import java.lang.reflect.Constructor;
import java.util.Map;
public class FilterChain implements Transformer<InputStream> {
private final ChainingTransformer<Reader> transformers = new ChainingTransformer<Reader>(Reader.class);
/**
* Transforms the given Reader. The original Reader will be closed by the returned Reader.
*/
public Reader transform(Reader original) {
return transformers.transform(original);
}
/**
* Transforms the given InputStream. The original InputStream will be closed by the returned InputStream.
*/
public InputStream transform(InputStream original) {
return new ReaderInputStream(transform(new InputStreamReader(original)));
}
public boolean hasFilters() {
return transformers.hasTransformers();
}
public void add(Class<? extends FilterReader> filterType) {
add(filterType, null);
}
public void add(final Class<? extends FilterReader> filterType, final Map<String, ?> properties) {
transformers.add(new Transformer<Reader>() {
public Reader transform(Reader original) {
try {
Constructor<? extends FilterReader> constructor = filterType.getConstructor(Reader.class);
FilterReader result = constructor.newInstance(original);
if (properties != null) {
ConfigureUtil.configureByMap(properties, result);
}
return result;
} catch (Throwable th) {
throw new InvalidUserDataException("Error - Invalid filter specification for " + filterType.getName());
}
}
});
}
public void add(final Closure closure) {
transformers.add(new Transformer<Reader>() {
public Reader transform(Reader original) {
return new LineFilter(original, closure);
}
});
}
public void expand(final Map<String, ?> properties) {
transformers.add(new Transformer<Reader>() {
public Reader transform(Reader original) {
try {
Template template;
try {
SimpleTemplateEngine engine = new SimpleTemplateEngine();
template = engine.createTemplate(original);
} finally {
original.close();
}
StringWriter writer = new StringWriter();
template.make(properties).writeTo(writer);
return new StringReader(writer.toString());
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
});
}
}