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/*
* Copyright (C) 2007 The Android Open Source Project
*
* 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.snapscript.dx.cf.direct;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.snapscript.dex.util.FileUtils;
/**
* Opens all the class files found in a class path element. Path elements
* can point to class files, {jar,zip,apk} files, or directories containing
* class files.
*/
public class ClassPathOpener {
/** {@code non-null;} pathname to start with */
private final String pathname;
/** {@code non-null;} callback interface */
private final Consumer consumer;
/**
* If true, sort such that classes appear before their inner
* classes and "package-info" occurs before all other classes in that
* package.
*/
private final boolean sort;
private FileNameFilter filter;
/**
* Callback interface for {@code ClassOpener}.
*/
public interface Consumer {
/**
* Provides the file name and byte array for a class path element.
*
* @param name {@code non-null;} filename of element. May not be a valid
* filesystem path.
*
* @param lastModified milliseconds since 1970-Jan-1 00:00:00 GMT
* @param bytes {@code non-null;} file data
* @return true on success. Result is or'd with all other results
* from {@code processFileBytes} and returned to the caller
* of {@code process()}.
*/
boolean processFileBytes(String name, long lastModified, byte[] bytes);
/**
* Informs consumer that an exception occurred while processing
* this path element. Processing will continue if possible.
*
* @param ex {@code non-null;} exception
*/
void onException(Exception ex);
/**
* Informs consumer that processing of an archive file has begun.
*
* @param file {@code non-null;} archive file being processed
*/
void onProcessArchiveStart(File file);
}
/**
* Filter interface for {@code ClassOpener}.
*/
public interface FileNameFilter {
boolean accept(String path);
}
/**
* An accept all filter.
*/
public static final FileNameFilter acceptAll = new FileNameFilter() {
@Override
public boolean accept(String path) {
return true;
}
};
/**
* Constructs an instance.
*
* @param pathname {@code non-null;} path element to process
* @param sort if true, sort such that classes appear before their inner
* classes and "package-info" occurs before all other classes in that
* package.
* @param consumer {@code non-null;} callback interface
*/
public ClassPathOpener(String pathname, boolean sort, Consumer consumer) {
this(pathname, sort, acceptAll, consumer);
}
/**
* Constructs an instance.
*
* @param pathname {@code non-null;} path element to process
* @param sort if true, sort such that classes appear before their inner
* classes and "package-info" occurs before all other classes in that
* package.
* @param consumer {@code non-null;} callback interface
*/
public ClassPathOpener(String pathname, boolean sort, FileNameFilter filter,
Consumer consumer) {
this.pathname = pathname;
this.sort = sort;
this.consumer = consumer;
this.filter = filter;
}
/**
* Processes a path element.
*
* @return the OR of all return values
* from {@code Consumer.processFileBytes()}.
*/
public boolean process() {
File file = new File(pathname);
return processOne(file, true);
}
/**
* Processes one file.
*
* @param file {@code non-null;} the file to process
* @param topLevel whether this is a top-level file (that is,
* specified directly on the commandline)
* @return whether any processing actually happened
*/
private boolean processOne(File file, boolean topLevel) {
try {
if (file.isDirectory()) {
return processDirectory(file, topLevel);
}
String path = file.getPath();
if (path.endsWith(".zip") ||
path.endsWith(".jar") ||
path.endsWith(".apk")) {
return processArchive(file);
}
if (filter.accept(path)) {
byte[] bytes = FileUtils.readFile(file);
return consumer.processFileBytes(path, file.lastModified(), bytes);
} else {
return false;
}
} catch (Exception ex) {
consumer.onException(ex);
return false;
}
}
/**
* Sorts java class names such that outer classes preceed their inner
* classes and "package-info" preceeds all other classes in its package.
*
* @param a {@code non-null;} first class name
* @param b {@code non-null;} second class name
* @return {@code compareTo()}-style result
*/
private static int compareClassNames(String a, String b) {
// Ensure inner classes sort second
a = a.replace('$','0');
b = b.replace('$','0');
/*
* Assuming "package-info" only occurs at the end, ensures package-info
* sorts first.
*/
a = a.replace("package-info", "");
b = b.replace("package-info", "");
return a.compareTo(b);
}
/**
* Processes a directory recursively.
*
* @param dir {@code non-null;} file representing the directory
* @param topLevel whether this is a top-level directory (that is,
* specified directly on the commandline)
* @return whether any processing actually happened
*/
private boolean processDirectory(File dir, boolean topLevel) {
if (topLevel) {
dir = new File(dir, ".");
}
File[] files = dir.listFiles();
int len = files.length;
boolean any = false;
if (sort) {
Arrays.sort(files, new Comparator() {
public int compare(File a, File b) {
return compareClassNames(a.getName(), b.getName());
}
});
}
for (int i = 0; i < len; i++) {
any |= processOne(files[i], false);
}
return any;
}
/**
* Processes the contents of an archive ({@code .zip},
* {@code .jar}, or {@code .apk}).
*
* @param file {@code non-null;} archive file to process
* @return whether any processing actually happened
* @throws IOException on i/o problem
*/
private boolean processArchive(File file) throws IOException {
ZipFile zip = new ZipFile(file);
ArrayList entriesList
= Collections.list(zip.entries());
if (sort) {
Collections.sort(entriesList, new Comparator() {
public int compare (ZipEntry a, ZipEntry b) {
return compareClassNames(a.getName(), b.getName());
}
});
}
consumer.onProcessArchiveStart(file);
ByteArrayOutputStream baos = new ByteArrayOutputStream(40000);
byte[] buf = new byte[20000];
boolean any = false;
for (ZipEntry one : entriesList) {
final boolean isDirectory = one.isDirectory();
String path = one.getName();
if (filter.accept(path)) {
final byte[] bytes;
if (!isDirectory) {
InputStream in = zip.getInputStream(one);
baos.reset();
int read;
while ((read = in.read(buf)) != -1) {
baos.write(buf, 0, read);
}
in.close();
bytes = baos.toByteArray();
} else {
bytes = new byte[0];
}
any |= consumer.processFileBytes(path, one.getTime(), bytes);
}
}
zip.close();
return any;
}
}
