/*
* Copyright 2004-2009 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.compass.core.config.binding.scanner;
import java.io.IOException;
import java.io.InputStream;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
/**
* @author kimchy
*/
public class JarScanner implements Scanner {
private JarInputStream jar;
private JarEntry next;
private Filter filter;
private boolean initial = true;
private boolean closed = false;
public JarScanner(String basePackage, InputStream is, Filter filter) throws IOException {
this.filter = new JarPackageFilterWrapper(basePackage, filter);
jar = new JarInputStream(is);
}
private void setNext() {
initial = true;
try {
if (next != null) jar.closeEntry();
next = null;
do {
next = jar.getNextJarEntry();
} while (next != null && (next.isDirectory() || (filter == null || !filter.accepts(next.getName()))));
if (next == null) {
close();
}
} catch (IOException e) {
throw new RuntimeException("failed to browse jar", e);
}
}
public ScanItem next() {
if (closed || (next == null && !initial)) return null;
setNext();
if (next == null) return null;
return new ScanItem(new InputStreamWrapper(jar), next.getName());
}
public void close() {
try {
closed = true;
jar.close();
} catch (IOException ignored) {
// do nothing
}
}
private class JarPackageFilterWrapper implements Filter {
private String basePackage;
private Filter delegate;
private JarPackageFilterWrapper(String basePackage, Filter delegate) {
this.basePackage = basePackage;
this.delegate = delegate;
}
public boolean accepts(String name) {
if (!name.startsWith(basePackage)) {
return false;
}
return delegate.accepts(name.substring(basePackage.length() + 1));
}
}
}