Ant example source code file (ZipLong.java)

This example Ant source code file (ZipLong.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Ant tags/keywords

cloneable, cloneable, ziplong, ziplong

The ZipLong.java source code

/*
 *  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.tools.zip;

/**
 * Utility class that represents a four byte integer with conversion
 * rules for the big endian byte order of ZIP files.
 *
 */
public final class ZipLong implements Cloneable {

    private long value;

    /**
     * Create instance from a number.
     * @param value the long to store as a ZipLong
     * @since 1.1
     */
    public ZipLong(long value) {
        this.value = value;
    }

    /**
     * Create instance from bytes.
     * @param bytes the bytes to store as a ZipLong
     * @since 1.1
     */
    public ZipLong (byte[] bytes) {
        this(bytes, 0);
    }

    /**
     * Create instance from the four bytes starting at offset.
     * @param bytes the bytes to store as a ZipLong
     * @param offset the offset to start
     * @since 1.1
     */
    public ZipLong (byte[] bytes, int offset) {
        value = ZipLong.getValue(bytes, offset);
    }

    /**
     * Get value as four bytes in big endian byte order.
     * @since 1.1
     * @return value as four bytes in big endian order
     */
    public byte[] getBytes() {
        return ZipLong.getBytes(value);
    }

    /**
     * Get value as Java long.
     * @since 1.1
     * @return value as a long
     */
    public long getValue() {
        return value;
    }

    /**
     * Get value as four bytes in big endian byte order.
     * @param value the value to convert
     * @return value as four bytes in big endian byte order
     */
    public static byte[] getBytes(long value) {
        byte[] result = new byte[4];
        result[0] = (byte) ((value & 0xFF));
        result[1] = (byte) ((value & 0xFF00) >> 8);
        result[2] = (byte) ((value & 0xFF0000) >> 16);
        result[3] = (byte) ((value & 0xFF000000L) >> 24);
        return result;
    }

    /**
     * Helper method to get the value as a Java long from four bytes starting at given array offset
     * @param bytes the array of bytes
     * @param offset the offset to start
     * @return the correspondanding Java long value
     */
    public static long getValue(byte[] bytes, int offset) {
        long value = (bytes[offset + 3] << 24) & 0xFF000000L;
        value += (bytes[offset + 2] << 16) & 0xFF0000;
        value += (bytes[offset + 1] << 8) & 0xFF00;
        value += (bytes[offset] & 0xFF);
        return value;
    }

    /**
     * Helper method to get the value as a Java long from a four-byte array
     * @param bytes the array of bytes
     * @return the correspondanding Java long value
     */
    public static long getValue(byte[] bytes) {
        return getValue(bytes, 0);
    }

    /**
     * Override to make two instances with same value equal.
     * @param o an object to compare
     * @return true if the objects are equal
     * @since 1.1
     */
    public boolean equals(Object o) {
        if (o == null || !(o instanceof ZipLong)) {
            return false;
        }
        return value == ((ZipLong) o).getValue();
    }

    /**
     * Override to make two instances with same value equal.
     * @return the value stored in the ZipLong
     * @since 1.1
     */
    public int hashCode() {
        return (int) value;
    }
}