/*
* 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.google.devtools.j2objc.file;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
/**
* A file inside a .jar file.
*
* @author Mike Thvedt
*/
public class JarredInputFile implements InputFile {
private final String jarPath;
private final String internalPath;
/**
* Create a new JarredSourceFile. The file's unit name will be the same as
* the given internal path.
* @param jarPath a filesystem path to the containing .jar
* @param internalPath the file's path within the jar
*/
public JarredInputFile(String jarPath, String internalPath) {
assert !jarPath.endsWith(".java");
this.jarPath = jarPath;
this.internalPath = internalPath;
}
@Override
public boolean exists() throws IOException {
try (JarFile jarFile = new JarFile(jarPath)) {
ZipEntry entry = jarFile.getEntry(internalPath);
return entry != null;
}
}
@Override
public InputStream getInputStream() throws IOException {
final JarFile jarFile = new JarFile(jarPath);
ZipEntry entry = jarFile.getEntry(internalPath);
final InputStream entryStream = jarFile.getInputStream(entry);
return new InputStream() {
@Override
public int read() throws IOException {
return entryStream.read();
}
@Override
public int read(byte[] buffer) throws IOException {
return entryStream.read(buffer);
}
@Override
public int read(byte[] buffer, int byteOffset, int byteCount) throws IOException {
return entryStream.read(buffer, byteOffset, byteCount);
}
@Override
public void close() throws IOException {
entryStream.close();
jarFile.close();
}
};
}
@Override
public Reader openReader(Charset charset) throws IOException {
return new InputStreamReader(getInputStream(), charset);
}
@Override
public String getAbsolutePath() {
return jarPath;
}
@Override
public String getOriginalLocation() {
return "jar:file:" + jarPath + "!" + internalPath;
}
@Override
public String getUnitName() {
return internalPath;
}
@Override
public String getBasename() {
return internalPath.substring(internalPath.lastIndexOf('/') + 1);
}
@Override
public long lastModified() {
return new File(jarPath).lastModified();
}
@Override
public String toString() {
return getOriginalLocation();
}
}