com.ibm.util.merge.CompareArchives.java Source code

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Here is the source code for com.ibm.util.merge.CompareArchives.java

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/*
 * Copyright 2015, 2015 IBM
 * 
 * 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.ibm.util.merge;

import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.io.IOUtils;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

public final class CompareArchives {

    public static final void assertArchiveEquals(String type, String archive1, String archive2)
            throws NoSuchAlgorithmException, IOException {
        if (type.endsWith("zip")) {
            assertZipEquals(archive1, archive2);
        } else {
            assertTarEquals(archive1, archive2);
        }
    }

    /**
     * @param archive1
     * @param archive2
     * @throws ZipException 
     * @throws IOException
     */
    public static final void assertZipEquals(String archive1, String archive2) throws ZipException, IOException {
        // Get Archives
        ZipFile zipFile1 = new ZipFile(new File(archive1));
        ZipFile zipFile2 = new ZipFile(new File(archive2));

        // Get Member Hash
        HashMap<String, ZipEntry> files1 = getMembers(zipFile1);
        HashMap<String, ZipEntry> files2 = getMembers(zipFile2);

        // Compare Files
        assertMembersEqual(zipFile1, files1, zipFile2, files2);
    }

    /**
     * @param archive
     * @return
     * @throws IOException
     */
    private static final HashMap<String, ZipEntry> getMembers(ZipFile archive) throws IOException {
        HashMap<String, ZipEntry> map = new HashMap<>();
        @SuppressWarnings("unchecked")
        Enumeration<ZipEntry> entries = (Enumeration<ZipEntry>) archive.entries();
        while (entries.hasMoreElements()) {
            ZipEntry entry = entries.nextElement();
            map.put(entry.getName(), entry);
        }
        return map;
    }

    /**
     * @param zip1
     * @param files1
     * @param zip2
     * @param files2
     * @throws IOException
     */
    private static final void assertMembersEqual(ZipFile zip1, HashMap<String, ZipEntry> files1, ZipFile zip2,
            HashMap<String, ZipEntry> files2) throws IOException {
        if (files1.size() != files2.size()) {
            fail("Different Sizes, expected " + Integer.toString(files1.size()) + " found "
                    + Integer.toString(files2.size()));
        }

        for (String key : files1.keySet()) {
            if (!files2.containsKey(key)) {
                fail("Expected file not in target " + key);
            }
            String file1 = IOUtils.toString(zip1.getInputStream(files1.get(key)));
            String file2 = IOUtils.toString(zip2.getInputStream(files2.get(key)));
            assertEquals(file1, file2);
        }
    }

    /**
     * @param archive1
     * @param archive2
     * @throws IOException
     * @throws NoSuchAlgorithmException
     */
    public static final void assertTarEquals(String archive1, String archive2)
            throws IOException, NoSuchAlgorithmException {
        // Get Member Hash
        HashMap<String, TarArchiveEntry> files1 = getMembers(archive1);
        HashMap<String, TarArchiveEntry> files2 = getMembers(archive2);

        // Compare Files
        assertMembersEqual(archive1, files1, archive2, files2);
    }

    /**
     * @param archive
     * @return
     * @throws IOException
     */
    private static final HashMap<String, TarArchiveEntry> getMembers(String archive) throws IOException {
        TarArchiveInputStream input = new TarArchiveInputStream(
                new BufferedInputStream(new FileInputStream(archive)));

        TarArchiveEntry entry;
        HashMap<String, TarArchiveEntry> map = new HashMap<>();
        while ((entry = input.getNextTarEntry()) != null) {
            map.put(entry.getName(), entry);
        }
        input.close();
        return map;
    }

    /**
     * @param tar1
     * @param files1
     * @param tar2
     * @param files2
     * @throws IOException
     */
    private static final void assertMembersEqual(String tar1, HashMap<String, TarArchiveEntry> files1, String tar2,
            HashMap<String, TarArchiveEntry> files2) throws IOException {
        if (files1.size() != files2.size()) {
            fail("Different Sizes, expected " + Integer.toString(files1.size()) + " found "
                    + Integer.toString(files2.size()));
        }

        for (String key : files1.keySet()) {
            if (!files2.containsKey(key)) {
                fail("Expected file not in target " + key);
            }
        }

        for (String key : files1.keySet()) {
            if (!files2.containsKey(key)) {
                fail("Expected file not in target " + key);
            }
        }
        for (String key : files1.keySet()) {
            String file1 = getTarFile(tar1, key);
            String file2 = getTarFile(tar2, key);
            assertEquals(file1, file2);
        }
    }

    /**
     * @param archive
     * @param name
     * @return
     * @throws IOException
     */
    private static final String getTarFile(String archive, String name) throws IOException {
        TarArchiveInputStream input = new TarArchiveInputStream(
                new BufferedInputStream(new FileInputStream(archive)));
        TarArchiveEntry entry;
        while ((entry = input.getNextTarEntry()) != null) {
            if (entry.getName().equals(name)) {
                byte[] content = new byte[(int) entry.getSize()];
                input.read(content, 0, content.length);
                input.close();
                return new String(content);
            }
        }
        input.close();
        return "";
    }

}