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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.
- * @throws PropertyException if a property exception occurs
- */
- 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).
- * @throws PropertyException if a property exception occurs
- */
- 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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