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/*
* $Id$
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2004 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache", nor may
* "Apache" appear in their name, without prior written permission of the
* Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ============================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Apache Software Foundation and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.fop.fo.properties;
import org.apache.fop.apps.FOPException;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
/**
* A maker which calculates the line-height property.
* This property maker is special because line-height inherit the specified
* value, instead of the computed value.
* So when a line-height is create based on a attribute, the specified value
* is stored in the property and in compute() the stored specified value of
* the nearest specified is used to recalculate the line-height.
*/
public class LineHeightPropertyMaker extends LengthProperty.Maker {
/**
* Create a maker for line-height.
* @param propId the is for linehight.
*/
public LineHeightPropertyMaker(int propId) {
super(propId);
}
/**
* Make a property as normal, and save the specified value.
* @see Property.Maker#make(PropertyList, String, FObj)
*/
public Property make(PropertyList propertyList, String value,
FObj fo) throws FOPException {
Property p = super.make(propertyList, value, fo);
p.setSpecifiedValue(checkValueKeywords(value));
return p;
}
/**
* Recalculate the line-height value based on the nearest specified
* value.
* @see Property.Maker#compute(PropertyList)
*/
protected Property compute(PropertyList propertyList) throws FOPException {
// recalculate based on last specified value
// Climb up propertylist and find last spec'd value
Property specProp = propertyList.getNearestSpecified(propId);
if (specProp != null) {
String specVal = specProp.getSpecifiedValue();
if (specVal != null) {
try {
return make(propertyList, specVal,
propertyList.getParentFObj());
} catch (FOPException e) {
//getLogger()error("Error computing property value for "
// + propName + " from "
// + specVal);
return null;
}
}
}
return null;
}
protected Property convertPropertyDatatype(Property p,
PropertyList propertyList,
FObj fo) {
Number numval = p.getNumber();
if (numval != null) {
return new PercentLength(numval.doubleValue(), getPercentBase(fo,propertyList));
}
return super.convertPropertyDatatype(p, propertyList, fo);
}
}
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