org.teavm.parsing.JarFileResourceProvider Maven / Gradle / Ivy
/*
* Copyright 2012 Alexey Andreev.
*
* 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.teavm.parsing;
import java.io.*;
import java.util.jar.JarFile;
import java.util.jar.JarInputStream;
import java.util.zip.ZipEntry;
/**
*
* @author Alexey Andreev
*/
public class JarFileResourceProvider implements ResourceProvider {
private File file;
public JarFileResourceProvider(File file) {
if (file == null) {
throw new IllegalArgumentException();
}
this.file = file;
}
public JarFileResourceProvider(String fileName) {
this(new File(fileName));
}
@Override
public boolean hasResource(String name) {
try (JarFile jar = new JarFile(file)) {
return jar.getEntry(name) != null;
} catch (FileNotFoundException ex) {
throw new IllegalStateException("The underlying file does not exist", ex);
} catch (IOException ex) {
throw new IllegalStateException("Error reading jar file", ex);
}
}
@Override
public InputStream openResource(String name) {
try {
JarInputStream input = new JarInputStream(new FileInputStream(file));
while (true) {
ZipEntry entry = input.getNextEntry();
if (entry == null) {
input.close();
throw new IllegalArgumentException("Resource not found: " + name);
}
if (entry.getName().equals(name)) {
return input;
}
if (name.startsWith("/") && entry.getName().equals(name.substring(1))) {
return input;
}
}
} catch (FileNotFoundException e) {
throw new IllegalStateException("The underlying file does not exist");
} catch (IOException e) {
throw new IllegalStateException("Error reading jar file");
}
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy