/*
* 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: LengthRangeProperty.java 627367 2008-02-13 12:03:30Z maxberger $ */
package org.apache.fop.fo.properties;
import org.apache.fop.datatypes.CompoundDatatype;
import org.apache.fop.datatypes.Length;
import org.apache.fop.datatypes.PercentBaseContext;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.expr.PropertyException;
/**
* Superclass for properties that contain LengthRange values
*/
public class LengthRangeProperty extends Property implements CompoundDatatype {
private Property minimum;
private Property optimum;
private Property maximum;
private static final int MINSET = 1;
private static final int OPTSET = 2;
private static final int MAXSET = 4;
private int bfSet = 0; // bit field
private boolean consistent = false;
/**
* Inner class for a Maker for LengthProperty objects
*/
public static class Maker extends CompoundPropertyMaker {
/**
* @param propId the id of the property for which a Maker should be created
*/
public Maker(int propId) {
super(propId);
}
/**
* Create a new empty instance of LengthRangeProperty.
* @return the new instance.
*/
public Property makeNewProperty() {
return new LengthRangeProperty();
}
private boolean isNegativeLength(Length len) {
return ((len instanceof PercentLength
&& ((PercentLength) len).getPercentage() < 0)
|| (len.isAbsolute() && len.getValue() < 0));
}
/** {@inheritDoc} */
public Property convertProperty(Property p,
PropertyList propertyList, FObj fo)
throws PropertyException {
if (p instanceof LengthRangeProperty) {
return p;
}
if (this.propId == PR_BLOCK_PROGRESSION_DIMENSION
|| this.propId == PR_INLINE_PROGRESSION_DIMENSION) {
Length len = p.getLength();
if (len != null) {
if (isNegativeLength(len)) {
log.warn(FObj.decorateWithContextInfo(
"Replaced negative value (" + len + ") for " + getName()
+ " with 0mpt", fo));
p = FixedLength.ZERO_FIXED_LENGTH;
}
}
}
return super.convertProperty(p, propertyList, fo);
}
/**
* {@inheritDoc}
*/
protected Property setSubprop(Property baseProperty, int subpropertyId,
Property subproperty) {
CompoundDatatype val = (CompoundDatatype) baseProperty.getObject();
if (this.propId == PR_BLOCK_PROGRESSION_DIMENSION
|| this.propId == PR_INLINE_PROGRESSION_DIMENSION) {
Length len = subproperty.getLength();
if (len != null) {
if (isNegativeLength(len)) {
log.warn("Replaced negative value (" + len + ") for " + getName()
+ " with 0mpt");
val.setComponent(subpropertyId,
FixedLength.ZERO_FIXED_LENGTH, false);
return baseProperty;
}
}
}
val.setComponent(subpropertyId, subproperty, false);
return baseProperty;
}
}
/**
* {@inheritDoc}
*/
public void setComponent(int cmpId, Property cmpnValue,
boolean bIsDefault) {
if (cmpId == CP_MINIMUM) {
setMinimum(cmpnValue, bIsDefault);
} else if (cmpId == CP_OPTIMUM) {
setOptimum(cmpnValue, bIsDefault);
} else if (cmpId == CP_MAXIMUM) {
setMaximum(cmpnValue, bIsDefault);
}
}
/**
* {@inheritDoc}
*/
public Property getComponent(int cmpId) {
if (cmpId == CP_MINIMUM) {
return getMinimum(null);
} else if (cmpId == CP_OPTIMUM) {
return getOptimum(null);
} else if (cmpId == CP_MAXIMUM) {
return getMaximum(null);
} else {
return null; // SHOULDN'T HAPPEN
}
}
/**
* Set minimum value to min.
* @param minimum A Length value specifying the minimum value for this
* LengthRange.
* @param bIsDefault If true, this is set as a "default" value
* and not a user-specified explicit value.
*/
protected void setMinimum(Property minimum, boolean bIsDefault) {
this.minimum = minimum;
if (!bIsDefault) {
bfSet |= MINSET;
}
consistent = false;
}
/**
* Set maximum value to max if it is >= optimum or optimum isn't set.
* @param max A Length value specifying the maximum value for this
* @param bIsDefault If true, this is set as a "default" value
* and not a user-specified explicit value.
*/
protected void setMaximum(Property max, boolean bIsDefault) {
maximum = max;
if (!bIsDefault) {
bfSet |= MAXSET;
}
consistent = false;
}
/**
* Set the optimum value.
* @param opt A Length value specifying the optimum value for this
* @param bIsDefault If true, this is set as a "default" value
* and not a user-specified explicit value.
*/
protected void setOptimum(Property opt, boolean bIsDefault) {
optimum = opt;
if (!bIsDefault) {
bfSet |= OPTSET;
}
consistent = false;
}
// Minimum is prioritaire, if explicit
private void checkConsistency(PercentBaseContext context) {
if (consistent) {
return;
}
if (context == null) {
return;
}
// Make sure max >= min
// Must also control if have any allowed enum values!
if (!minimum.isAuto() && !maximum.isAuto()
&& minimum.getLength().getValue(context) > maximum.getLength().getValue(context)) {
if ((bfSet & MINSET) != 0) {
// if minimum is explicit, force max to min
if ((bfSet & MAXSET) != 0) {
// Warning: min>max, resetting max to min
log.error("forcing max to min in LengthRange");
}
maximum = minimum;
} else {
minimum = maximum; // minimum was default value
}
}
// Now make sure opt <= max and opt >= min
if (!optimum.isAuto() && !maximum.isAuto()
&& optimum.getLength().getValue(context) > maximum.getLength().getValue(context)) {
if ((bfSet & OPTSET) != 0) {
if ((bfSet & MAXSET) != 0) {
// Warning: opt > max, resetting opt to max
log.error("forcing opt to max in LengthRange");
optimum = maximum;
} else {
maximum = optimum; // maximum was default value
}
} else {
// opt is default and max is explicit or default
optimum = maximum;
}
} else if (!optimum.isAuto() && !minimum.isAuto()
&& optimum.getLength().getValue(context)
< minimum.getLength().getValue(context)) {
if ((bfSet & MINSET) != 0) {
// if minimum is explicit, force opt to min
if ((bfSet & OPTSET) != 0) {
log.error("forcing opt to min in LengthRange");
}
optimum = minimum;
} else {
minimum = optimum; // minimum was default value
}
}
consistent = true;
}
/**
* @param context Percentage evaluation context
* @return minimum length
*/
public Property getMinimum(PercentBaseContext context) {
checkConsistency(context);
return this.minimum;
}
/**
* @param context Percentage evaluation context
* @return maximum length
*/
public Property getMaximum(PercentBaseContext context) {
checkConsistency(context);
return this.maximum;
}
/**
* @param context Percentage evaluation context
* @return optimum length
*/
public Property getOptimum(PercentBaseContext context) {
checkConsistency(context);
return this.optimum;
}
/** {@inheritDoc} */
public String toString() {
return "LengthRange["
+ "min:" + getMinimum(null).getObject()
+ ", max:" + getMaximum(null).getObject()
+ ", opt:" + getOptimum(null).getObject() + "]";
}
/**
* @return this.lengthRange
*/
public LengthRangeProperty getLengthRange() {
return this;
}
/**
* @return this.lengthRange cast as an Object
*/
public Object getObject() {
return this;
}
}