DateChunk.java

/*
 * Digital Audio Access Protocol (DAAP) Library
 * Copyright (C) 2004-2010 Roger Kapsi
 *
 * 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.ardverk.daap.chunks;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This class is an implementation of a date chunk. The date is an integer int
 * seconds since 1.1.1970.
 * 
 * @author Roger Kapsi
 */
public abstract class DateChunk extends AbstractChunk {

    private static final Logger LOG = LoggerFactory.getLogger(DateChunk.class);

    public static final long MIN_VALUE = 0l;
    public static final long MAX_VALUE = 0xFFFFFFFFl;

    protected int date;

    public DateChunk(int type, String name, long value) {
        super(type, name);
        setValue(value);
    }

    public DateChunk(String type, String name, long date) {
        super(type, name);
        setValue(date);
    }

    public long getValue() {
        return date & MAX_VALUE;
    }

    public void setValue(long date) {
        this.date = (int) checkDateRange(date);
    }

    /**
     * Checks if #MIN_VALUE <= value <= #MAX_VALUE and if not an
     * IllegalArgumentException is thrown.
     */
    public static long checkDateRange(long value)
            throws IllegalArgumentException {
        if (value < MIN_VALUE || value > MAX_VALUE) {
            if (LOG.isErrorEnabled()) {
                LOG.error("Value is outside of Date range: " + value);
            }
        }
        return value;
    }

    /**
     * Returns {@see #DATE_TYPE}
     */
    public int getType() {
        return Chunk.DATE_TYPE;
    }

    public String toString(int indent) {
        return indent(indent) + name + "(" + getContentCodeString()
                + "; date)=" + getValue();
    }
}