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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.fo.expr;
import java.util.Stack;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.datatypes.Length;
import org.apache.fop.datatypes.PercentBase;
import org.apache.fop.fo.Constants;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.properties.PropertyMaker;
/**
* This class holds context information needed during property expression
* evaluation.
* It holds the Maker object for the property, the PropertyList being
* built, and the FObj parent of the FObj for which the property is being set.
*/
public class PropertyInfo {
private PropertyMaker maker;
private PropertyList plist;
private FObj fo;
private Stack stkFunction; // Stack of functions being evaluated
/**
* Constructor
* @param maker Property.Maker object
* @param plist PropertyList object
*/
public PropertyInfo(PropertyMaker maker, PropertyList plist) {
this.maker = maker;
this.plist = plist;
this.fo = plist.getParentFObj();
}
/**
* Return the PercentBase object used to calculate the absolute value from
* a percent specification.
* Propagates to the Maker.
* @return The PercentBase object or null if percentLengthOK()=false.
*/
public PercentBase getPercentBase() throws PropertyException {
PercentBase pcbase = getFunctionPercentBase();
return (pcbase != null) ? pcbase : maker.getPercentBase(plist);
}
/**
* @return the current font-size value as base units (milli-points).
*/
public Length currentFontSize() throws PropertyException {
return plist.get(Constants.PR_FONT_SIZE).getLength();
}
/**
* accessor for FObj
* @return FObj
*/
public FObj getFO() {
return fo;
}
/**
* accessor for PropertyList
* @return PropertyList object
*/
public PropertyList getPropertyList() {
return plist;
}
/**
* accessor for PropertyMaker
* @return PropertyMaker object
*/
public PropertyMaker getPropertyMaker() {
return maker;
}
/**
* push a function onto the function stack
* @param func function to push onto stack
*/
public void pushFunction(Function func) {
if (stkFunction == null) {
stkFunction = new Stack();
}
stkFunction.push(func);
}
/**
* pop a function off of the function stack
*/
public void popFunction() {
if (stkFunction != null) {
stkFunction.pop();
}
}
/**
* Convenience shortcut to get a reference to the FOUserAgent
*
* @return the FOUserAgent
*/
protected FOUserAgent getUserAgent() {
return (plist.getFObj() != null)
? plist.getFObj().getUserAgent()
: null;
}
private PercentBase getFunctionPercentBase() {
if (stkFunction != null) {
Function f = (Function)stkFunction.peek();
if (f != null) {
return f.getPercentBase();
}
}
return null;
}
}
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