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/*
 * RED5 Open Source Media Server - https://github.com/Red5/ Copyright 2006-2016 by respective authors (see below). All rights reserved. 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.red5.io.object;

/**
 * The UnsignedInt class wraps a value of an unsigned 32 bits number.
 * 
 * @author Matteo Merli ([email protected])
 */
public final class UnsignedInt extends UnsignedNumber {
    static final long serialVersionUID = 1L;

    private long value;

    public UnsignedInt(byte c) {
        value = c;
    }

    public UnsignedInt(short c) {
        value = c;
    }

    public UnsignedInt(int c) {
        value = c;
    }

    public UnsignedInt(long c) {
        value = c & 0xFFFFFFFFL;
    }

    private UnsignedInt() {
        value = 0;
    }

    public static UnsignedInt fromBytes(byte[] c) {
        return fromBytes(c, 0);
    }

    public static UnsignedInt fromBytes(byte[] c, int idx) {
        UnsignedInt number = new UnsignedInt();
        if ((c.length - idx) < 4) {
            throw new IllegalArgumentException("An UnsignedInt number is composed of 4 bytes.");
        }
        number.value = (c[0] << 24 | c[1] << 16 | c[2] << 8 | c[3]);
        return number;
    }

    public static UnsignedInt fromString(String c) {
        return fromString(c, 10);
    }

    public static UnsignedInt fromString(String c, int radix) {
        UnsignedInt number = new UnsignedInt();
        long v = Long.parseLong(c, radix);
        number.value = v & 0xFFFFFFFFL;
        return number;
    }

    @Override
    public double doubleValue() {
        return value;
    }

    @Override
    public float floatValue() {
        return value;
    }

    @Override
    public int intValue() {
        return (int) (value & 0xFFFFFFFFL);
    }

    @Override
    public long longValue() {
        return value & 0xFFFFFFFFL;
    }

    @Override
    public byte[] getBytes() {
        byte[] c = new byte[4];
        c[0] = (byte) ((value >> 24) & 0xFF);
        c[1] = (byte) ((value >> 16) & 0xFF);
        c[2] = (byte) ((value >> 8) & 0xFF);
        c[3] = (byte) ((value >> 0) & 0xFF);
        return c;
    }

    @Override
    public int compareTo(UnsignedNumber other) {
        long otherValue = other.longValue();
        if (value > otherValue)
            return +1;
        else if (value < otherValue)
            return -1;
        return 0;
    }

    @Override
    public boolean equals(Object other) {
        if (!(other instanceof Number))
            return false;
        return value == ((Number) other).longValue();
    }

    @Override
    public String toString() {
        return Long.toString(value & 0xFFFFFFFFL);
    }

    @Override
    public int hashCode() {
        return (int) (value ^ (value >>> 32));
    }

    @Override
    public void shiftRight(int nBits) {
        if (Math.abs(nBits) > 32)
            throw new IllegalArgumentException("Cannot right shift " + nBits + " an UnsignedInt.");

        value >>>= nBits;
    }

    @Override
    public void shiftLeft(int nBits) {
        if (Math.abs(nBits) > 32)
            throw new IllegalArgumentException("Cannot left shift " + nBits + " an UnsignedInt.");

        value <<= nBits;
    }

}