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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.fo.properties;
import org.apache.fop.datatypes.PercentBaseContext;
import org.apache.fop.datatypes.PercentBase;
import org.apache.fop.fo.expr.PropertyException;
/**
* a percent specified length quantity in XSL
*/
public class PercentLength extends LengthProperty {
/**
* The percentage itself, expressed as a decimal value, e.g. for 95%, set
* the value to .95
*/
private double factor;
/**
* A PercentBase implementation that contains the base length to which the
* {@link #factor} should be applied to compute the actual length
*/
private PercentBase lbase = null;
private double resolvedValue;
/**
* Main constructor. Construct an object based on a factor (the percent,
* as a factor) and an object which has a method to return the Length which
* provides the "base" for the actual length that is modeled.
* @param factor the percentage factor, expressed as a decimal (e.g. use
* .95 to represent 95%)
* @param lbase base property to which the factor should be applied
*/
public PercentLength(double factor, PercentBase lbase) {
this.factor = factor;
this.lbase = lbase;
}
/**
* @return the base
*/
public PercentBase getBaseLength() {
return this.lbase;
}
/**
*
* @return the factor
* TODO: Should this really exists?
*/
public double value() {
return factor;
}
/**
* Return false because percent-length are always relative.
* @see org.apache.fop.datatypes.Numeric#isAbsolute()
*/
public boolean isAbsolute() {
return false;
}
/**
* Return the value of this Numeric.
* @see org.apache.fop.datatypes.Numeric#getNumericValue()
*/
public double getNumericValue() {
return getNumericValue(null);
}
/**
* Return the value of this Numeric.
* @param context Evaluation context
* @return the length in millipoints
* @see Numeric#getNumericValue(Object)
*/
public double getNumericValue(PercentBaseContext context) {
try {
resolvedValue = factor * lbase.getBaseLength(context);
return resolvedValue;
} catch (PropertyException exc) {
log.error(exc);
return 0;
}
}
/**
* Return the length of this PercentLength.
* @see org.apache.fop.datatypes.Length#getValue()
*/
public int getValue() {
return (int) getNumericValue();
}
/**
* Return the value of this numeric as a length in millipoints.
* @param Evaluation context
*/
public int getValue(PercentBaseContext context) {
return (int) getNumericValue(context);
}
/**
* @return the String equivalent of this
*/
public String toString() {
// TODO: What about the base value?
return (new Double(factor * 100.0).toString()) + "%";
}
}
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