01: /*
02: * Copyright (c) 2002-2008 Gargoyle Software Inc. All rights reserved.
03: *
04: * Redistribution and use in source and binary forms, with or without
05: * modification, are permitted provided that the following conditions are met:
06: *
07: * 1. Redistributions of source code must retain the above copyright notice,
08: * this list of conditions and the following disclaimer.
09: * 2. Redistributions in binary form must reproduce the above copyright notice,
10: * this list of conditions and the following disclaimer in the documentation
11: * and/or other materials provided with the distribution.
12: * 3. The end-user documentation included with the redistribution, if any, must
13: * include the following acknowledgment:
14: *
15: * "This product includes software developed by Gargoyle Software Inc.
16: * (http://www.GargoyleSoftware.com/)."
17: *
18: * Alternately, this acknowledgment may appear in the software itself, if
19: * and wherever such third-party acknowledgments normally appear.
20: * 4. The name "Gargoyle Software" must not be used to endorse or promote
21: * products derived from this software without prior written permission.
22: * For written permission, please contact info@GargoyleSoftware.com.
23: * 5. Products derived from this software may not be called "HtmlUnit", nor may
24: * "HtmlUnit" appear in their name, without prior written permission of
25: * Gargoyle Software Inc.
26: *
27: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
28: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
29: * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GARGOYLE
30: * SOFTWARE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
31: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
32: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
33: * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34: * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35: * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
36: * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37: */
38: package com.gargoylesoftware.htmlunit.html.xpath;
39:
40: import java.util.HashMap;
41: import java.util.Map;
42:
43: import org.jaxen.Function;
44: import org.jaxen.FunctionContext;
45: import org.jaxen.UnresolvableException;
46:
47: import com.gargoylesoftware.htmlunit.Assert;
48:
49: /**
50: * A wrapper allowing to add new functions without affecting the original context.
51: *
52: * @version $Revision: 2132 $
53: * @author Marc Guillemot
54: */
55: public class FunctionContextWrapper implements FunctionContext {
56: private final FunctionContext wrappedContext_;
57: private final Map localFunctions_ = new HashMap();
58:
59: /**
60: * Wraps an existing context
61: * @param functionContext the context to wrap
62: */
63: public FunctionContextWrapper(final FunctionContext functionContext) {
64: Assert.notNull("function context", functionContext);
65: wrappedContext_ = functionContext;
66: }
67:
68: /**
69: * First look at the locally defined function and if none found calls the wrapped
70: * context.
71: * {@inheritDoc}
72: */
73: public Function getFunction(final String namespaceURI,
74: final String prefix, final String localName)
75: throws UnresolvableException {
76:
77: final Function localFunction = (Function) localFunctions_
78: .get(localName);
79: if (localFunction != null) {
80: return localFunction;
81: }
82: return wrappedContext_.getFunction(namespaceURI, prefix,
83: localName);
84: }
85:
86: /**
87: * Registers a function for this context.
88: * @param localName The non-prefixed local portion of the function to be registered with this context.
89: * @param function the object to be used when evaluating the function.
90: */
91: public void registerFunction(final String localName,
92: final Function function) {
93: Assert.notNull("function", function);
94: Assert.notNull("localName", localName);
95:
96: localFunctions_.put(localName, function);
97: }
98: }
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