ant/src/main/org/apache/tools/zip/ZipEntry.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    distribution.
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 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
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 */

package org.apache.tools.zip;

import java.util.Vector;
import java.util.zip.ZipException;

/**
 * Extension that adds better handling of extra fields and provides
 * access to the internal and external file attributes.
 *
 * @author <a href="stefan.bodewig@epost.de">Stefan Bodewig</a>
 * @version $Revision$
 */
public class ZipEntry extends java.util.zip.ZipEntry {

    private int internalAttributes = 0;
    private long externalAttributes = 0;
    private Vector extraFields = new Vector();

    /**
     * Creates a new zip entry with the specified name.
     *
     * @since 1.1
     */
    public ZipEntry(String name) {
        super(name);
    }

    /**
     * Creates a new zip entry with fields taken from the specified zip entry.
     *
     * @since 1.1
     */
    public ZipEntry(java.util.zip.ZipEntry entry) throws ZipException {
        super(entry);
        byte[] extra = entry.getExtra();
        if (extra != null) {
            setExtraFields(ExtraFieldUtils.parse(extra));
        } else {
            // initializes extra data to an empty byte array
            setExtra();
        }
    }

    /**
     * Creates a new zip entry with fields taken from the specified zip entry.
     *
     * @since 1.1
     */
    public ZipEntry(ZipEntry entry) {
        super(entry);
        setInternalAttributes(entry.getInternalAttributes());
        setExternalAttributes(entry.getExternalAttributes());
        setExtraFields(entry.getExtraFields());
    }

    /**
     * Overwrite clone
     *
     * @since 1.1
     */
    public Object clone() {
        ZipEntry e = null;
        try {
            e = new ZipEntry((java.util.zip.ZipEntry) super.clone());
        } catch (Exception ex) {
            // impossible as extra data is in correct format
            ex.printStackTrace();
        }
        e.setInternalAttributes(getInternalAttributes());
        e.setExternalAttributes(getExternalAttributes());
        e.setExtraFields(getExtraFields());
        return e;
    }

    /**
     * Retrieves the internal file attributes.
     *
     * @since 1.1
     */
    public int getInternalAttributes() {
        return internalAttributes;
    }

    /**
     * Sets the internal file attributes.
     *
     * @since 1.1
     */
    public void setInternalAttributes(int value) {
        internalAttributes = value;
    }

    /**
     * Retrieves the external file attributes.
     *
     * @since 1.1
     */
    public long getExternalAttributes() {
        return externalAttributes;
    }

    /**
     * Sets the external file attributes.
     *
     * @since 1.1
     */
    public void setExternalAttributes(long value) {
        externalAttributes = value;
    }

    /**
     * Replaces all currently attached extra fields with the new array.
     *
     * @since 1.1
     */
    public void setExtraFields(ZipExtraField[] fields) {
        extraFields.removeAllElements();
        for (int i=0; i<fields.length; i++) {
            extraFields.addElement(fields[i]);
        }
        setExtra();
    }

    /**
     * Retrieves extra fields.
     *
     * @since 1.1
     */
    public ZipExtraField[] getExtraFields() {
        ZipExtraField[] result = new ZipExtraField[extraFields.size()];
        extraFields.copyInto(result);
        return result;
    }

    /**
     * Adds an extra fields - replacing an already present extra field
     * of the same type.
     *
     * @since 1.1
     */
    public void addExtraField(ZipExtraField ze) {
        ZipShort type = ze.getHeaderId();
        boolean done = false;
        for (int i=0; !done && i<extraFields.size(); i++) {
            if (((ZipExtraField) extraFields.elementAt(i)).getHeaderId().equals(type)) {
                extraFields.setElementAt(ze, i);
                done = true;
            }
        }
        if (!done) {
            extraFields.addElement(ze);
        }
        setExtra();
    }

    /**
     * Remove an extra fields.
     *
     * @since 1.1
     */
    public void removeExtraField(ZipShort type) {
        boolean done = false;
        for (int i=0; !done && i<extraFields.size(); i++) {
            if (((ZipExtraField) extraFields.elementAt(i)).getHeaderId().equals(type)) {
                extraFields.removeElementAt(i);
                done = true;
            }
        }
        if (!done) {
            throw new java.util.NoSuchElementException();
        }
        setExtra();
    }

    /**
     * Throws an Exception if extra data cannot be parsed into extra fields.
     *
     * @since 1.1
     */
    public void setExtra(byte[] extra) throws RuntimeException {
        try {
            setExtraFields(ExtraFieldUtils.parse(extra));
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
        }
    }

    /**
     * Unfortunately {@link java.util.zip.ZipOutputStream
     * java.util.zip.ZipOutputStream} seems to access the extra data
     * directly, so overriding getExtra doesn't help - we need to
     * modify super's data directly.
     *
     * @since 1.1
     */
    protected void setExtra() {
        super.setExtra(ExtraFieldUtils.mergeLocalFileDataData(getExtraFields()));
    }

    /**
     * Retrieves the extra data for the local file data.
     *
     * @since 1.1
     */
    public byte[] getLocalFileDataExtra() {
        byte[] extra = getExtra();
        return extra != null ? extra : new byte[0];
    }

    /**
     * Retrieves the extra data for the central directory.
     *
     * @since 1.1
     */
    public byte[] getCentralDirectoryExtra() {
        return ExtraFieldUtils.mergeCentralDirectoryData(getExtraFields());
    }
}