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Java > Open Source Codes > org > apache > fop > datatypes > SimplePercentBaseContext


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * 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: SimplePercentBaseContext.java 426576 2006-07-28 15:44:37Z jeremias $ */
19
20 package org.apache.fop.datatypes;
21
22 import org.apache.fop.fo.FObj;
23
24 /**
25  * Class to implement a simple lookup context for a single percent base value.
26  */
27 public class SimplePercentBaseContext implements PercentBaseContext {
28     
29     private PercentBaseContext parentContext;
30     private int lengthBase;
31     private int lengthBaseValue;
32
33     /**
34      * @param parentContext the context to be used for all percentages other than lengthBase
35      * @param lengthBase the particular percentage length base for which this context provides
36      * a value
37      * @param lengthBaseValue the value to be returned for requests to the given lengthBase
38      */
39     public SimplePercentBaseContext(PercentBaseContext parentContext,
40                              int lengthBase,
41                              int lengthBaseValue) {
42         this.parentContext = parentContext;
43         this.lengthBase = lengthBase;
44         this.lengthBaseValue = lengthBaseValue;
45     }
46
47     /**
48      * Returns the value for the given lengthBase.
49      * @see org.apache.fop.datatypes.PercentBaseContext#getBaseLength(int, FObj)
50      */
51     public int getBaseLength(int lengthBase, FObj fobj) {
52         // if its for us return our value otherwise delegate to parent context
53 if (lengthBase == this.lengthBase) {
54             return lengthBaseValue;
55         } else if (parentContext != null) {
56             return parentContext.getBaseLength(lengthBase, fobj);
57         }
58         return -1;
59     }
60
61 }
62
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