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Java > Open Source Codes > org > apache > fop > fo > expr > SystemColorFunction


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 /* $Id$ */
19  
20 package org.apache.fop.fo.expr;
21
22 import org.apache.fop.apps.FOUserAgent;
23 import org.apache.fop.fo.properties.ColorProperty;
24 import org.apache.fop.fo.properties.Property;
25
26 /**
27  * Implements the system-color() function.
28  */
29 class SystemColorFunction extends FunctionBase {
30     
31     /** @see org.apache.fop.fo.expr.Function#nbArgs() */
32     public int nbArgs() {
33         return 1;
34     }
35
36     /** @see org.apache.fop.fo.expr.Function */
37     public Property eval(Property[] args,
38                          PropertyInfo pInfo) throws PropertyException {
39         FOUserAgent ua = (pInfo == null)
40                 ? null
41                 : (pInfo.getFO() == null ? null : pInfo.getFO().getUserAgent());
42         return new ColorProperty(ua, "system-color(" + args[0] + ")");
43
44     }
45
46 }
47
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