/*
 * $Id$
 * Copyright (C) 2001-2002 The Apache Software Foundation. All rights reserved.
 * For details on use and redistribution please refer to the
 * LICENSE file included with these sources.
 */

package org.apache.fop.area;

/**
 * This class holds the resolved (as mpoints) form of a LengthRange or
 * Space type Property value.
 * MinOptMax values are used during layout calculations. The instance
 * variables are package visible.
 */
public class MinOptMax implements java.io.Serializable, Cloneable {

    /** Publicly visible min(imum), opt(imum) and max(imum) values.*/
    public int min;
    public int opt;
    public int max;

    public MinOptMax() {
        this(0);
    }

    public MinOptMax(int val) {
        this(val, val, val);
    }

    public MinOptMax(int min, int opt, int max) {
        this.min = min;
        this.opt = opt;
        this.max = max;
    }

    public Object clone() {
        try {
            return super.clone();
        } catch (CloneNotSupportedException ex) {
            // SHOULD NEVER OCCUR - all members are primitive types!
            return null;
        }
    }

    public static MinOptMax subtract(MinOptMax op1, MinOptMax op2) {
        return new MinOptMax(op1.min - op2.max, op1.opt - op2.opt,
                             op1.max - op2.min);
    }

    public static MinOptMax add(MinOptMax op1, MinOptMax op2) {
        return new MinOptMax(op1.min + op2.min, op1.opt + op2.opt,
                             op1.max + op2.max);
    }

    public static MinOptMax multiply(MinOptMax op1, double mult) {
        return new MinOptMax((int)(op1.min * mult),
                             (int)(op1.opt * mult), (int)(op1.max * mult));
    }

    public void add(MinOptMax op) {
        min += op.min;
        opt += op.opt;
        max += op.max;
    }

    public void subtract(MinOptMax op) {
        min -= op.max;
        opt -= op.opt;
        max -= op.min;
    }

}