Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.apache.ant.compress.util; import java.util.Date; import org.apache.tools.ant.BuildException; import org.apache.commons.compress.archivers.ArchiveEntry; import org.apache.commons.compress.archivers.ar.ArArchiveEntry; import org.apache.commons.compress.archivers.arj.ArjArchiveEntry; import org.apache.commons.compress.archivers.cpio.CpioArchiveEntry; import org.apache.commons.compress.archivers.dump.DumpArchiveEntry; import org.apache.commons.compress.archivers.sevenz.SevenZArchiveEntry; import org.apache.commons.compress.archivers.tar.TarArchiveEntry; import org.apache.commons.compress.archivers.zip.ZipArchiveEntry; /** * Helper methods that gloss over API differences between the * ArchiveEntry implementations of Apache Commons Compress 1.3. */ public class EntryHelper { private EntryHelper() { } // REVISIT: are the "mode" formats really compatible with each other? /** * Extracts the permission bits from an entry. */ public static int getMode(ArchiveEntry entry) { if (entry == null) { throw new IllegalArgumentException("entry must not be null."); } if (entry instanceof ArArchiveEntry) { return ((ArArchiveEntry) entry).getMode(); } if (entry instanceof ArjArchiveEntry) { return ((ArjArchiveEntry) entry).getUnixMode(); } if (entry instanceof CpioArchiveEntry) { return (int) ((CpioArchiveEntry) entry).getMode(); } if (entry instanceof SevenZArchiveEntry) { return UNKNOWN_ID; } if (entry instanceof TarArchiveEntry) { return ((TarArchiveEntry) entry).getMode(); } if (entry instanceof ZipArchiveEntry) { return ((ZipArchiveEntry) entry).getUnixMode(); } if (entry instanceof DumpArchiveEntry) { return ((DumpArchiveEntry) entry).getMode(); } throw new BuildException("archive entry " + entry.getClass() + " is not supported."); } public static int UNKNOWN_ID = Integer.MIN_VALUE; /** * Extracts the user id an entry. */ public static int getUserId(ArchiveEntry entry) { if (entry == null) { throw new IllegalArgumentException("entry must not be null."); } if (entry instanceof ArArchiveEntry) { return ((ArArchiveEntry) entry).getUserId(); } if (entry instanceof ArjArchiveEntry) { return UNKNOWN_ID; } if (entry instanceof CpioArchiveEntry) { return (int) ((CpioArchiveEntry) entry).getUID(); } if (entry instanceof SevenZArchiveEntry) { return UNKNOWN_ID; } if (entry instanceof TarArchiveEntry) { return ((TarArchiveEntry) entry).getUserId(); } if (entry instanceof ZipArchiveEntry) { return UNKNOWN_ID; } if (entry instanceof DumpArchiveEntry) { return ((DumpArchiveEntry) entry).getUserId(); } throw new BuildException("archive entry " + entry.getClass() + " is not supported."); } /** * Extracts the group id an entry. */ public static int getGroupId(ArchiveEntry entry) { if (entry == null) { throw new IllegalArgumentException("entry must not be null."); } if (entry instanceof ArArchiveEntry) { return ((ArArchiveEntry) entry).getGroupId(); } if (entry instanceof ArjArchiveEntry) { return UNKNOWN_ID; } if (entry instanceof CpioArchiveEntry) { return (int) ((CpioArchiveEntry) entry).getGID(); } if (entry instanceof SevenZArchiveEntry) { return UNKNOWN_ID; } if (entry instanceof TarArchiveEntry) { return ((TarArchiveEntry) entry).getGroupId(); } if (entry instanceof ZipArchiveEntry) { return UNKNOWN_ID; } if (entry instanceof DumpArchiveEntry) { return (int) ((DumpArchiveEntry) entry).getGroupId(); } throw new BuildException("archive entry " + entry.getClass() + " is not supported."); } }