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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.build.android.dexer;
import com.google.common.annotations.VisibleForTesting;
import java.util.Comparator;
import java.util.zip.ZipEntry;
/**
* Comparator that orders {@link ZipEntry ZipEntries} {@link #LIKE_DX like Android's dx tool}.
*/
enum ZipEntryComparator implements Comparator<ZipEntry> {
/**
* Comparator to order more or less order alphabetically by file name. See
* {@link #compareClassNames} for the exact name comparison.
*/
LIKE_DX;
@Override
// Copied from com.android.dx.cf.direct.ClassPathOpener
public int compare(ZipEntry a, ZipEntry b) {
return compareClassNames(a.getName(), b.getName());
}
/**
* 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
*/
// Copied from com.android.dx.cf.direct.ClassPathOpener
@VisibleForTesting
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);
}
}
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