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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/* $Id$ */
package org.apache.fop.traits;
/**
* 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;
/**
* New min/opt/max with zero values.
*/
public MinOptMax() {
this(0);
}
/**
* New min/opt/max with one fixed value.
*
* @param val the value for min, opt and max
*/
public MinOptMax(int val) {
this(val, val, val);
}
/**
* New min/opt/max with the three values.
*
* @param min the minimum value
* @param opt the optimum value
* @param max the maximum value
*/
public MinOptMax(int min, int opt, int max) {
// TODO: assert min<=opt<=max
this.min = min;
this.opt = opt;
this.max = max;
}
/**
* Copy constructor.
*
* @param op the MinOptMax object to copy
*/
public MinOptMax(MinOptMax op) {
this.min = op.min;
this.opt = op.opt;
this.max = op.max;
}
// TODO: remove this.
/**
* {@inheritDoc}
*/
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException ex) {
// SHOULD NEVER OCCUR - all members are primitive types!
return null;
}
}
/**
* Subtracts one MinOptMax instance from another returning a new one.
* @param op1 first instance to subtract from
* @param op2 second instance
* @return MinOptMax new instance
*/
public static MinOptMax subtract(MinOptMax op1, MinOptMax op2) {
return new MinOptMax(op1.min - op2.max, op1.opt - op2.opt,
op1.max - op2.min);
}
/**
* Adds one MinOptMax instance to another returning a new one.
* @param op1 first instance
* @param op2 second instance
* @return MinOptMax new instance
*/
public static MinOptMax add(MinOptMax op1, MinOptMax op2) {
return new MinOptMax(op1.min + op2.min, op1.opt + op2.opt,
op1.max + op2.max);
}
/**
* Multiplies a MinOptMax instance with a factor returning a new instance.
* @param op1 MinOptMax instance
* @param mult multiplier
* @return MinOptMax new instance
*/
public static MinOptMax multiply(MinOptMax op1, double mult) {
// TODO: assert mult>0
return new MinOptMax((int)(op1.min * mult),
(int)(op1.opt * mult), (int)(op1.max * mult));
}
/**
* Adds another MinOptMax instance to this one.
* @param op the other instance
*/
public void add(MinOptMax op) {
min += op.min;
opt += op.opt;
max += op.max;
}
/**
* Adds min, opt and max to their counterpart components.
* @param min the value to add to the minimum value
* @param opt the value to add to the optimum value
* @param max the value to add to the maximum value
*/
public void add(int min, int opt, int max) {
this.min += min;
this.opt += opt;
this.max += max;
// TODO: assert min<=opt<=max
}
/**
* Adds a length to all components.
* @param len the length to add
*/
public void add(int len) {
this.min += len;
this.opt += len;
this.max += len;
}
/**
* Subtracts another MinOptMax instance from this one.
* @param op the other instance
*/
public void subtract(MinOptMax op) {
min -= op.max;
opt -= op.opt;
max -= op.min;
}
/** @return true if this instance represents a zero-width length (min=opt=max=0) */
public boolean isNonZero() {
return (min != 0 || max != 0);
}
/** @return true if this instance allows for shrinking or stretching */
public boolean isElastic() {
return (min != opt || opt != max);
}
/** {@inheritDoc} */
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("MinOptMax[min=");
if (min != opt) {
sb.append(min).append("; ");
}
sb.append("opt=");
if (opt != max) {
sb.append(opt).append("; ");
}
sb.append("max=").append(max);
sb.append("]");
return sb.toString();
}
}
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