DeviceAttribute.java

/**
 * JHOVE2 - Next-generation architecture for format-aware characterization
 *
 * Copyright (c) 2009 by The Regents of the University of California
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * o Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * o Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * o Neither the name of the University of California/California Digital
 *   Library, Ithaka Harbors/Portico, or Stanford University, nor the names of
 *   its contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE. 
 */

package org.jhove2.module.format.icc.field;

import java.util.Iterator;
import java.util.Properties;
import java.util.Set;
import java.util.TreeSet;

import org.jhove2.core.JHOVE2;
import org.jhove2.core.JHOVE2Exception;

/** ICC device attribute as defined by ICC.1:2004-10, Table 18.
 * 
 * @author slabrams
 */
public class DeviceAttribute
implements Comparable<DeviceAttribute>
{
    /** Singleton device attributes. */
    protected static Set<DeviceAttribute> attrs;

    /** Device attribute bit position. */
    protected int position;

    /** Device attribute negative value. */
    protected String negativeValue;
    
    /** Device attribute positive value. */
    protected String positiveValue;

    /**
     * Instantiate a new <code>DeviceAttribute</code> object.
     * @param position Device attribute bit position
     * @param negative
     *            Device attribute negative value
     * @param positive
     *            Device attribute positive value
     */
    public DeviceAttribute(int position, String negative, String positive) {
        this.position      = position;
        this.negativeValue = negative;
        this.positiveValue = positive;
    }

    /**
     * Initialize the device attributes from their properties file. 
     * @param jhove2 JHOVE2 framework
     * @throws JHOVE2Exception
     */
    protected static synchronized void init(JHOVE2 jhove2)
        throws JHOVE2Exception
    {
        if (attrs == null) {
            /* Initialize the device attributes from a Java resource bundle. */
            attrs = new TreeSet<DeviceAttribute>();
            Properties props =
                jhove2.getConfigInfo().getProperties("DeviceAttributes");
            if (props != null) {
                Set<String> set = props.stringPropertyNames();
                Iterator<String> iter = set.iterator();
                while (iter.hasNext()) {
                    String bit = iter.next();
                    String neg = props.getProperty(bit);
                    String pos = neg;
                    int in = neg.indexOf('|');
                    if (in > 0) {
                        pos = neg.substring(in+1);
                        neg = neg.substring(0, in);
                    }
                    DeviceAttribute attr =
                        new DeviceAttribute(Integer.valueOf(bit), neg, pos);
                    attrs.add(attr);
                }
            }
        }
    }

    /**
     * Get the device attribute negative value.
     * @return device attribute negative value
     */
    public String getNegativeValue() {
        return this.negativeValue;
    }
    /**
     * Get the device attributes.
     * @param jhove2 JHOVE2 framework
     * @return device attributes
     * @throws JHOVE2Exception 
     */
    public static Set<DeviceAttribute> getDeviceAttributes(JHOVE2 jhove2)
        throws JHOVE2Exception
    {
        init(jhove2);
        return attrs;
    }

    /**
     * Get the device attribute bit position.
     * @return device attribute bit position
     */
    public int getPosition() {
        return this.position;
    }

    /**
     * Get the device attribute positive value.
     * @return device attribute positive value
     */
    public String getPositiveValue() {
        return this.positiveValue;
    }

    /**
     * Convert the device attribute to a Java string in the form:
     * "position: negative|positive".
     * @return Java string representation of the device attribute
     */
    public String toString() {
        return this.getPosition() + ": " + this.getNegativeValue() + "|" +
                                           this.getPositiveValue();
    }

    /**
     * Compare device attribute.
     * @param attr
     *            Device attribute to be compared
     * @return -1, 0, or 1 if this device attribute is less than,
     *         equal to, or greater than the second
     */
    @Override
    public int compareTo(DeviceAttribute attr) {
        int pos = attr.getPosition();
        if (this.position < pos) {
            return -1;
        }
        else if (this.position > pos) {
            return  1;
        }
        return 0;
    }
}