photark-jcr/src/main/java/org/apache/photark/jcr/util/ArchiveFileExtractor.java

/*
 * 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.photark.jcr.util;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.ArchiveException;
import org.apache.commons.compress.archivers.ArchiveInputStream;
import org.apache.commons.compress.archivers.ArchiveStreamFactory;
import org.apache.commons.io.IOUtils;
import org.apache.photark.Image;

public class ArchiveFileExtractor {
    private String entryTypes[];

    public ArchiveFileExtractor(String[] entryTypes) {
        this.entryTypes = entryTypes;
    }

    public List<Image> extractArchive(InputStream inStream) {
        ArchiveStreamFactory streamFactory = new ArchiveStreamFactory();
        List<Image> pictures = new ArrayList<Image>();
        try {
            ArchiveInputStream archiveInputStream = streamFactory.createArchiveInputStream(inStream);
            ArchiveEntry entry = null;
            while ((entry = archiveInputStream.getNextEntry()) != null) {
                if (!entry.isDirectory() && isEntryTypeAllowd(entry)) {
                    byte buf[] = IOUtils.toByteArray(archiveInputStream);
                    InputStream inputStream = new ByteArrayInputStream(buf);
                    Image picture = new Image(entry.getName(), new Date(), inputStream);
                    pictures.add(picture);
                }
            }
        } catch (ArchiveException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return pictures;
    }

    /**
     * Test whether this stream is of archive type or not
     * 
     * @param inStream InputStream
     * @return boolean
     */
    public boolean isArchive(InputStream inStream) {
        ArchiveStreamFactory streamFactory = new ArchiveStreamFactory();
        try {
            streamFactory.createArchiveInputStream(inStream);
            return true;
        } catch (ArchiveException e) {
            e.printStackTrace();
        }
        return false;
    }

    /**
     * Test weather the extension of given entry is allowed or not
     * 
     * @param entry ArchiveEntry
     * @return boolean
     */
    private boolean isEntryTypeAllowd(ArchiveEntry entry) {
        String entryName = entry.getName();
        for (String entryType : entryTypes) {
            if (entryName.endsWith(entryType))
                return true;
        }
        return false;
    }
}