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JDK 1.6
  javax.print.attribute. IntegerSyntax View Javadoc
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/*
 * @(#)IntegerSyntax.java	1.7 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.print.attribute;

import java.io.Serializable;

/**
 * Class IntegerSyntax is an abstract base class providing the common 
 * implementation of all attributes with integer values. 
 * <P>
 * Under the hood, an integer attribute is just an integer. You can get an 
 * integer attribute's integer value by calling {@link #getValue() 
 * <CODE>getValue()</CODE>}. An integer attribute's integer value is
 * established when it is constructed (see {@link #IntegerSyntax(int) 
 * <CODE>IntegerSyntax(int)</CODE>}). Once constructed, an integer attribute's 
 * value is immutable. 
 * <P>
 *
 * @author  David Mendenhall
 * @author  Alan Kaminsky
 */
public abstract class IntegerSyntax implements Serializable, Cloneable {

    private static final long serialVersionUID = 3644574816328081943L;

    /**
     * This integer attribute's integer value.
     * @serial
     */
    private int value;

    /**
     * Construct a new integer attribute with the given integer value.
     *
     * @param  value  Integer value.
     */
    protected IntegerSyntax(int value) {
	this.value = value;
    }

    /**
     * Construct a new integer attribute with the given integer value, which 
     * must lie within the given range. 
     *
     * @param  value       Integer value.
     * @param  lowerBound  Lower bound.
     * @param  upperBound  Upper bound.
     *
     * @exception  IllegalArgumentException
     *     (Unchecked exception) Thrown if <CODE>value</CODE> is less than 
     *     <CODE>lowerBound</CODE> or greater than 
     *     <CODE>upperBound</CODE>. 
     */
    protected IntegerSyntax(int value, int lowerBound, int upperBound) {
	if (lowerBound > value || value > upperBound) {
	    throw new IllegalArgumentException("Value " + value +
					       " not in range " + lowerBound +
					       ".." + upperBound);
	}
	this.value = value;
    }

    /**
     * Returns this integer attribute's integer value.
     * @return the integer value
     */
    public int getValue() {
	return value;
    }

    /**
     * Returns whether this integer attribute is equivalent to the passed in 
     * object. To be equivalent, all of the following conditions must be true: 
     * <OL TYPE=1>
     * <LI>
     * <CODE>object</CODE> is not null.
     * <LI>
     * <CODE>object</CODE> is an instance of class IntegerSyntax.
     * <LI>
     * This integer attribute's value and <CODE>object</CODE>'s value are 
     * equal. 
     * </OL>
     *
     * @param  object  Object to compare to.
     *
     * @return  True if <CODE>object</CODE> is equivalent to this integer
     *          attribute, false otherwise. 
     */
    public boolean equals(Object object) {

	return (object != null && object instanceof IntegerSyntax &&
		value == ((IntegerSyntax) object).value);
    }

    /**
     * Returns a hash code value for this integer attribute. The hash code is 
     * just this integer attribute's integer value.
     */
    public int hashCode() {
	return value;
    }

    /**
     * Returns a string value corresponding to this integer attribute. The 
     * string value is just this integer attribute's integer value converted to 
     * a string. 
     */
    public String toString() {
	return "" + value;
    }
}

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