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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.layoutmgr;
-
- import org.apache.fop.datatypes.PercentBaseContext;
- import org.apache.fop.fo.Constants;
- import org.apache.fop.fo.properties.LengthRangeProperty;
- import org.apache.fop.traits.MinOptMax;
-
- /**
- * Utilities for MinOptMax and LengthRangeProperty.
- */
- public class MinOptMaxUtil {
-
- /**
- * Restricts a MinOptMax using the values from a LengthRangeProperty.
- * @param mom MinOptMax to restrict
- * @param lr restricting source
- * @param context Percentage evaluation context
- */
- public static void restrict(MinOptMax mom, LengthRangeProperty lr,
- PercentBaseContext context) {
- if (lr.getEnum() != Constants.EN_AUTO) {
- if (lr.getMinimum(context).getEnum() != Constants.EN_AUTO) {
- int min = lr.getMinimum(context).getLength().getValue(context);
- if (min > mom.min) {
- mom.min = min;
- fixAfterMinChanged(mom);
- }
- }
- if (lr.getMaximum(context).getEnum() != Constants.EN_AUTO) {
- int max = lr.getMaximum(context).getLength().getValue(context);
- if (max < mom.max) {
- mom.max = max;
- if (mom.max < mom.opt) {
- mom.opt = mom.max;
- mom.min = mom.opt;
- }
- }
- }
- if (lr.getOptimum(context).getEnum() != Constants.EN_AUTO) {
- int opt = lr.getOptimum(context).getLength().getValue(context);
- if (opt > mom.min) {
- mom.opt = opt;
- if (mom.opt > mom.max) {
- mom.max = mom.opt;
- }
- }
- }
- }
- }
-
- /**
- * Extends the minimum length to the given length if necessary, and adjusts opt and
- * max accordingly.
- *
- * @param mom the min/opt/max trait
- * @param len the new minimum length
- */
- public static void extendMinimum(MinOptMax mom, int len) {
- if (mom.min < len) {
- mom.min = len;
- mom.opt = Math.max(mom.min, mom.opt);
- mom.max = Math.max(mom.opt, mom.max);
- }
- }
-
- /**
- * After a calculation on a MinOptMax, this can be called to set opt to
- * a new effective value.
- * @param mom MinOptMax to adjust
- */
- public static void fixAfterMinChanged(MinOptMax mom) {
- if (mom.min > mom.opt) {
- mom.opt = mom.min;
- if (mom.opt > mom.max) {
- mom.max = mom.opt;
- }
- }
- }
-
- /**
- * Converts a LengthRangeProperty to a MinOptMax.
- * @param prop LengthRangeProperty
- * @param context Percentage evaluation context
- * @return the requested MinOptMax instance
- */
- public static MinOptMax toMinOptMax(LengthRangeProperty prop, PercentBaseContext context) {
- MinOptMax mom = new MinOptMax(
- (prop.getMinimum(context).isAuto()
- ? 0 : prop.getMinimum(context).getLength().getValue(context)),
- (prop.getOptimum(context).isAuto()
- ? 0 : prop.getOptimum(context).getLength().getValue(context)),
- (prop.getMaximum(context).isAuto()
- ? Integer.MAX_VALUE
- : prop.getMaximum(context).getLength().getValue(context)));
- return mom;
- }
-
- }
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