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A simple library that facades org.apache.commons.compress, to provide an easy-to-use API for archiving and compressing into and out of File objects.
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/**
 *    Copyright 2013 Thomas Rausch
 *
 *    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.rauschig.jarchivelib;

import java.io.IOException;

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.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;

/**
 * Adapter for accessing mode flags from the different types of ArchiveEntries.
 * 
 * @param  the type of ArchiveEntry
 */
abstract class AttributeAccessor {

    private E entry;

    public AttributeAccessor(E entry) {
        this.entry = entry;
    }

    /**
     * Returns the entry that is being accessed
     * 
     * @return the entry
     */
    public E getEntry() {
        return entry;
    }

    /**
     * Returns the unix file mode.
     * 
     * @return unix file mode flags
     * @throws java.io.IOException
     */
    public abstract int getMode() throws IOException;

    /**
     * Detects the type of the given ArchiveEntry and returns an appropriate AttributeAccessor for it.
     * 
     * @param entry the adaptee
     * @return a new attribute accessor instance
     */
    public static AttributeAccessor create(ArchiveEntry entry) {
        if (entry instanceof TarArchiveEntry) {
            return new TarAttributeAccessor((TarArchiveEntry) entry);
        } else if (entry instanceof ZipArchiveEntry) {
            return new ZipAttributeAccessor((ZipArchiveEntry) entry);
        } else if (entry instanceof CpioArchiveEntry) {
            return new CpioAttributeAccessor((CpioArchiveEntry) entry);
        } else if (entry instanceof ArjArchiveEntry) {
            return new ArjAttributeAccessor((ArjArchiveEntry) entry);
        } else if (entry instanceof ArArchiveEntry) {
            return new ArAttributeAccessor((ArArchiveEntry) entry);
        }

        return new FallbackAttributeAccessor(entry);
    }

    public static class FallbackAttributeAccessor extends AttributeAccessor {
        protected FallbackAttributeAccessor(ArchiveEntry entry) {
            super(entry);
        }

        @Override
        public int getMode() {
            return 0;
        }
    }

    public static class TarAttributeAccessor extends AttributeAccessor {
        public TarAttributeAccessor(TarArchiveEntry entry) {
            super(entry);
        }

        @Override
        public int getMode() {
            return getEntry().getMode();
        }
    }

    public static class ZipAttributeAccessor extends AttributeAccessor {
        public ZipAttributeAccessor(ZipArchiveEntry entry) {
            super(entry);
        }

        @Override
        public int getMode() {
            return getEntry().getUnixMode();
        }
    }

    public static class CpioAttributeAccessor extends AttributeAccessor {
        public CpioAttributeAccessor(CpioArchiveEntry entry) {
            super(entry);
        }

        @Override
        public int getMode() {
            return (int) getEntry().getMode();
        }
    }

    public static class ArjAttributeAccessor extends AttributeAccessor {
        public ArjAttributeAccessor(ArjArchiveEntry entry) {
            super(entry);
        }

        @Override
        public int getMode() throws IOException {
            return getEntry().getMode();
        }
    }

    public static class ArAttributeAccessor extends AttributeAccessor {
        public ArAttributeAccessor(ArArchiveEntry entry) {
            super(entry);
        }

        @Override
        public int getMode() throws IOException {
            return getEntry().getMode();
        }
    }

}