Source Code Cross Referenced for DualFunctionMapper.java in  » Ajax » zk » org » zkoss » xel » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » zk » org.zkoss.xel.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /* DualFunctionMapper.java
02:
03:        {{IS_NOTE
04:        	Purpose:
05:        		
06:        	Description:
07:        		
08:        	History:
09:        		Sat Sep  1 12:15:16     2007, Created by tomyeh
10:        }}IS_NOTE
11:
12:        Copyright (C) 2007 Potix Corporation. All Rights Reserved.
13:
14:        {{IS_RIGHT
15:        	This program is distributed under GPL Version 2.0 in the hope that
16:        	it will be useful, but WITHOUT ANY WARRANTY.
17:        }}IS_RIGHT
18:         */
19:        package org.zkoss.xel.util;
20:
21:        import java.util.Collection;
22:
23:        import org.zkoss.util.DualCollection;
24:        import org.zkoss.xel.FunctionMapper;
25:        import org.zkoss.xel.Function;
26:
27:        /**
28:         * Combine two function mappers into one function mapper.
29:         *
30:         * @author tomyeh
31:         * @since 3.0.0
32:         */
33:        public class DualFunctionMapper implements  FunctionMapper {
34:            private FunctionMapper _first, _second;
35:
36:            /** Returns a function mapper by combining two function mappers.
37:             * It checks whether any of them is null, or equals. And, returns
38:             * the non-null one if another is null.
39:             * If both null, it returns null.
40:             */
41:            public static final FunctionMapper combine(FunctionMapper first,
42:                    FunctionMapper second) {
43:                if (first == second) //we don't use equals to have better performance
44:                    return first;
45:
46:                if (first != null)
47:                    if (second != null)
48:                        return new DualFunctionMapper(first, second);
49:                    else
50:                        return first;
51:                else
52:                    return second;
53:            }
54:
55:            /** Constructor.
56:             * It is better to use {@link #combine} instead of this method
57:             * since it checks whether any of them is null or equals.
58:             */
59:            public DualFunctionMapper(FunctionMapper first,
60:                    FunctionMapper second) {
61:                _first = first;
62:                _second = second;
63:            }
64:
65:            //-- FunctionMapper --//
66:            public Function resolveFunction(String prefix, String name) {
67:                Function m = _first != null ? _first.resolveFunction(prefix,
68:                        name) : null;
69:                return m != null ? m : _second != null ? _second
70:                        .resolveFunction(prefix, name) : null;
71:            }
72:
73:            public Collection getClassNames() {
74:                return combine(_first != null ? _first.getClassNames() : null,
75:                        _second != null ? _second.getClassNames() : null);
76:            }
77:
78:            public Class resolveClass(String name) {
79:                Class m = _first != null ? _first.resolveClass(name) : null;
80:                return m != null ? m : _second != null ? _second
81:                        .resolveClass(name) : null;
82:            }
83:
84:            private static Collection combine(Collection first,
85:                    Collection second) {
86:                return DualCollection.combine(
87:                        first != null && !first.isEmpty() ? first : null,
88:                        second != null && !second.isEmpty() ? second : null);
89:            }
90:        }
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