/
ZipResourceManager.java
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/
ZipResourceManager.java
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/*
* Copyright (c) 2006-2015 DMDirc Developers
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.dmdirc.util.resourcemanager;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* Provides an easy way to access files inside a zip or jar.
*/
public final class ZipResourceManager extends ResourceManager {
/** Zipfile instance. */
private final ZipFile zipFile;
/** Entries list. */
private final List<String> entries;
/**
* Instantiates ZipResourceManager.
*
* @param file Filename of the zip to load
*
* @throws IOException Throw when the zip fails to load
*/
protected ZipResourceManager(final String file) throws IOException {
this(new File(file));
}
/**
* Instantiates ZipResourceManager.
*
* @param file File of the zip to load
*
* @throws IOException Throw when the zip fails to load
*/
protected ZipResourceManager(final File file) throws IOException {
this(new ZipFile(file));
}
/**
* Instantiates ZipResourceManager.
*
* @param file ZipFile to load
*/
protected ZipResourceManager(final ZipFile file) {
zipFile = file;
entries = new ArrayList<>();
final Enumeration<? extends ZipEntry> zipEntries = zipFile.entries();
while (zipEntries.hasMoreElements()) {
entries.add(zipEntries.nextElement().getName());
}
}
/**
* Returns an instance of a ZipResourceManager for the specified file.
*
* @param filename Filename of the zip to load
*
* @return ZipResourceManager instance
*
* @throws IOException Throw when the zip fails to load
*/
public static synchronized ZipResourceManager getInstance(final String filename) throws
IOException {
return new ZipResourceManager(filename);
}
@Override
public boolean resourceExists(final String resource) {
final ZipEntry zipEntry = zipFile.getEntry(resource);
return zipEntry != null && !zipEntry.isDirectory();
}
@Override
public byte[] getResourceBytes(final String resource) {
final ZipEntry zipEntry = zipFile.getEntry(resource);
if (zipEntry == null) {
return new byte[0];
}
if (zipEntry.isDirectory()) {
return new byte[0];
}
final byte[] bytes = new byte[(int) zipEntry.getSize()];
try (BufferedInputStream inputStream = new BufferedInputStream(zipFile.getInputStream
(zipEntry))) {
if (inputStream.read(bytes) != bytes.length) {
return new byte[0];
}
} catch (IOException ex) {
return new byte[0];
}
return bytes;
}
@Override
public InputStream getResourceInputStream(final String resource) {
final ZipEntry zipEntry = zipFile.getEntry(resource);
if (zipEntry == null) {
return null;
}
try {
return zipFile.getInputStream(zipEntry);
} catch (IOException ex) {
return null;
}
}
@Override
public URL getResourceURL(final String resource) throws MalformedURLException {
if (resourceExists(resource)) {
return new URL("jar:file:/" + zipFile.getName() + '!'
+ (resource.charAt(0) == '/' ? resource : '/' + resource));
} else {
return null;
}
}
@Override
public Map<String, byte[]> getResourcesEndingWithAsBytes(
final String resourcesSuffix) {
final Map<String, byte[]> resources = new HashMap<>();
entries.stream().filter(entry -> entry.endsWith(resourcesSuffix))
.forEach(entry -> resources.put(entry, getResourceBytes(entry)));
return resources;
}
@Override
public Map<String, byte[]> getResourcesStartingWithAsBytes(
final String resourcesPrefix) {
final Map<String, byte[]> resources = new HashMap<>();
entries.stream().filter(entry -> entry.startsWith(resourcesPrefix))
.forEach(entry -> resources.put(entry, getResourceBytes(entry)));
return resources;
}
@Override
public Map<String, InputStream> getResourcesStartingWithAsInputStreams(
final String resourcesPrefix) {
final Map<String, InputStream> resources = new HashMap<>();
entries.stream().filter(entry -> entry.startsWith(resourcesPrefix))
.forEach(entry -> resources.put(entry, getResourceInputStream(entry)));
return resources;
}
@Override
public List<String> getResourcesStartingWith(final String resourcesPrefix) {
return entries.stream()
.filter(entry -> entry.startsWith(resourcesPrefix))
.collect(Collectors.toList());
}
}