01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17:
18: /* $Id: InheritedPropFunction.java 426576 2006-07-28 15:44:37Z jeremias $ */
19:
20: package org.apache.fop.fo.expr;
21:
22: import org.apache.fop.fo.FOPropertyMapping;
23: import org.apache.fop.fo.properties.Property;
24:
25: /**
26: * Class modelling the inherited-property-value Property Value function. See
27: * Sec. 5.10.4 of the XSL-FO standard.
28: */
29: public class InheritedPropFunction extends FunctionBase {
30:
31: /**
32: * @return 1 (maximum number of arguments for the inherited-property-value
33: * function)
34: */
35: public int nbArgs() {
36: return 1;
37: }
38:
39: /**
40: * @return true (allow padding of arglist with property name)
41: */
42: public boolean padArgsWithPropertyName() {
43: return true;
44: }
45:
46: /**
47: *
48: * @param args arguments to be evaluated
49: * @param pInfo PropertyInfo object to be evaluated
50: * @return Property satisfying the inherited-property-value
51: * @throws PropertyException for invalid parameter
52: */
53: public Property eval(Property[] args, PropertyInfo pInfo)
54: throws PropertyException {
55: String propName = args[0].getString();
56: if (propName == null) {
57: throw new PropertyException(
58: "Incorrect parameter to inherited-property-value function");
59: }
60:
61: int propId = FOPropertyMapping.getPropertyId(propName);
62: return pInfo.getPropertyList().getInherited(propId);
63: }
64:
65: }
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