com.facebook.buck.testutil.integration.ApkInspector.java Source code

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Here is the source code for com.facebook.buck.testutil.integration.ApkInspector.java

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/*
 * Copyright 2014-present Facebook, Inc.
 *
 * 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.facebook.buck.testutil.integration;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;

import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class ApkInspector {

    private final File apkFile;
    private final ImmutableSet<String> apkFileEntries;

    public ApkInspector(File apkFile) throws IOException {
        this.apkFile = Preconditions.checkNotNull(apkFile);

        final ImmutableSet.Builder<String> builder = ImmutableSet.builder();
        try (ZipFile zipFile = new ZipFile(apkFile)) {
            Enumeration<? extends ZipEntry> entries = zipFile.entries();
            while (entries.hasMoreElements()) {
                builder.add(entries.nextElement().getName());
            }
        }
        this.apkFileEntries = builder.build();
    }

    public void assertFileExists(String pathRelativeToRoot) {
        assertTrue(apkFileEntries.contains(pathRelativeToRoot));
    }

    public void assertFileDoesNotExist(String pathRelativeToRoot) {
        assertFalse(apkFileEntries.contains(pathRelativeToRoot));
    }

    public long getCrc(String pathRelativeToRoot) throws IOException {
        try (ZipFile zipFile = new ZipFile(apkFile)) {
            ZipEntry entry = zipFile.getEntry(pathRelativeToRoot);
            long crc = entry.getCrc();
            Preconditions.checkState(crc != -1, "Error accessing crc for entry: %s", pathRelativeToRoot);
            return crc;
        }
    }
}