/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.io;

import proguard.classfile.ClassConstants;

import java.io.*;
import java.util.zip.*;

/**
 * This <code>DataEntry</code> represents a ZIP entry.
 *
 * @author Eric Lafortune
 */
public class ZipFileDataEntry implements DataEntry
{
    private final DataEntry   parent;
    private final ZipEntry    zipEntry;
    private       ZipFile     zipFile;
    private       InputStream zipInputStream;
    private       InputStream bufferedInputStream;


    public ZipFileDataEntry(DataEntry parent,
                            ZipEntry  zipEntry,
                            ZipFile   zipFile)
    {
        this.parent   = parent;
        this.zipEntry = zipEntry;
        this.zipFile  = zipFile;
    }


    // Implementations for DataEntry.

    public String getName()
    {
        // Get the right separators.
        String name = zipEntry.getName()
            .replace(File.separatorChar, ClassConstants.PACKAGE_SEPARATOR);

        // Chop the trailing directory slash, if any.
        int length = name.length();
        return length > 0 &&
               name.charAt(length-1) == ClassConstants.PACKAGE_SEPARATOR ?
                   name.substring(0, length -1) :
                   name;
    }


    public String getOriginalName()
    {
        return getName();
    }


    public long getSize()
    {
        return zipEntry.getSize();
    }


    public boolean isDirectory()
    {
        return zipEntry.isDirectory();
    }


    public InputStream getInputStream() throws IOException
    {
        if (zipInputStream == null)
        {
            zipInputStream = zipFile.getInputStream(zipEntry);
        }

        if (bufferedInputStream == null)
        {
            bufferedInputStream = new BufferedInputStream(zipInputStream);
        }

        return bufferedInputStream;
    }


    public void closeInputStream() throws IOException
    {
        zipInputStream.close();
        zipFile             = null;
        bufferedInputStream = null;
    }


    public DataEntry getParent()
    {
        return parent;
    }


    // Implementations for Object.

    public String toString()
    {
        return parent.toString() + ':' + getName();
    }
}
