/**
* Copyright 2011-2014 Asakusa Framework Team.
*
* 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 com.asakusafw.compiler.common;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.MessageFormat;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.asakusafw.compiler.batch.ResourceRepository;
import com.asakusafw.compiler.flow.Location;
import com.asakusafw.runtime.io.util.ZipEntryInputStream;
/**
* ファイルシステム上のZIPアーカイブをリソースのリポジトリとする。
*/
public class ZipRepository implements ResourceRepository {
static final Logger LOG = LoggerFactory.getLogger(ZipRepository.class);
private final File archive;
/**
* インスタンスを生成する。
* @param archive リポジトリのルートディレクトリ
* @throws IOException 指定されたファイルを読み出せない場合
* @throws IllegalArgumentException 引数に{@code null}が指定された場合
*/
public ZipRepository(File archive) throws IOException {
Precondition.checkMustNotBeNull(archive, "archive"); //$NON-NLS-1$
if (archive.isFile() == false) {
throw new IOException(MessageFormat.format(
"{0} is not a directory",
archive));
}
this.archive = archive.getAbsoluteFile().getCanonicalFile();
}
@Override
public Cursor createCursor() throws IOException {
FileInputStream input = new FileInputStream(archive);
boolean success = false;
try {
Cursor cursor = new EntryCursor(archive, new ZipInputStream(input));
success = true;
return cursor;
} finally {
if (success == false) {
input.close();
}
}
}
private static class EntryCursor implements Cursor {
private final File source;
private final ZipInputStream stream;
private ZipEntry current;
private int entries;
EntryCursor(File source, ZipInputStream stream) {
assert source != null;
assert stream != null;
this.source = source;
this.stream = stream;
this.entries = 0;
}
@Override
public boolean next() throws IOException {
while (true) {
current = stream.getNextEntry();
if (current == null) {
if (entries == 0) {
throw new IOException(MessageFormat.format(
"Invalid ZIP format: {0}",
source));
}
return false;
}
entries++;
if (current.isDirectory() == false) {
return true;
}
}
}
@Override
public Location getLocation() {
return Location.fromPath(
current.getName().replace('\\', '/'),
'/');
}
@Override
public InputStream openResource() throws IOException {
return new ZipEntryInputStream(stream);
}
@Override
public void close() throws IOException {
stream.close();
}
}
}