1 /*
2 * Copyright (c) 2007, Fraunhofer-Gesellschaft
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * (1) Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the disclaimer at the end.
11 * Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
14 * distribution.
15 *
16 * (2) Neither the name of Fraunhofer nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * DISCLAIMER
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
28 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 */
35 package org.ogf.graap.wsag.server.monitoring;
36
37 import java.text.MessageFormat;
38 import java.util.HashMap;
39 import java.util.Map;
40
41 import org.apache.commons.jexl2.JexlContext;
42
43 /**
44 * An implementation of the {@link JexlContext}. In contrast to the default implementation this specific
45 * implementation throws an {@link IllegalStateException} if a non-existing variable is resolved from the
46 * context. This prevents that default values are used for non-existing variables during expression
47 * evaluation.
48 *
49 * @author Oliver Waeldrich
50 *
51 */
52 public class JEXLWSAG4JContext extends HashMap<String, Object> implements JexlContext
53 {
54
55 private static final long serialVersionUID = 1L;
56
57 /**
58 * Sets a list variables for this context at once.
59 *
60 * @param map
61 * the parameters to set
62 *
63 * @see JexlContext#set(String, Object)
64 */
65 public void setVars( Map<String, Object> map )
66 {
67 clear();
68 putAll( map );
69 }
70
71 /**
72 * {@inheritDoc}
73 */
74 public Object get( String key )
75 {
76 Object result = super.get( key );
77
78 if ( result == null )
79 {
80 throw new IllegalStateException(
81 MessageFormat.format( "Unable to resolve value for variable {0}",
82 new Object[] { key } ) );
83 }
84
85 return result;
86 }
87
88 /**
89 * {@inheritDoc}
90 *
91 * @see org.apache.commons.jexl2.JexlContext#has(java.lang.String)
92 */
93 public boolean has( String key )
94 {
95 return containsKey( key );
96 }
97
98 /**
99 * {@inheritDoc}
100 *
101 * @see org.apache.commons.jexl2.JexlContext#set(java.lang.String, java.lang.Object)
102 */
103 public void set( String name, Object value )
104 {
105 super.put( name, value );
106 }
107
108 }