StringEqualsEvaluator


1   /*
2    * Copyright (C) 2005 Alfresco, Inc.
3    *
4    * Licensed under the Mozilla Public License version 1.1 
5    * with a permitted attribution clause. You may obtain a
6    * copy of the License at
7    *
8    *   http://www.alfresco.org/legal/license.txt
9    *
10   * Unless required by applicable law or agreed to in writing,
11   * software distributed under the License is distributed on an
12   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13   * either express or implied. See the License for the specific
14   * language governing permissions and limitations under the
15   * License.
16   */
17  package org.alfresco.web.ui.common.component.evaluator;
18  
19  import javax.faces.context.FacesContext;
20  import javax.faces.el.ValueBinding;
21  
22  /**
23   * @author kevinr
24   * 
25   * Evaluates to true if the value exactly matches the supplied string condition.
26   */
27  public class StringEqualsEvaluator extends BaseEvaluator
28  {
29     /**
30      * Evaluate against the component attributes. Return true to allow the inner
31      * components to render, false to hide them during rendering.
32      * 
33      * @return true to allow rendering of child components, false otherwise
34      */
35     public boolean evaluate()
36     {
37        boolean result = false;
38        
39        try
40        {
41           result = getCondition().equals((String  )getValue());
42        }
43        catch (Exception   err)
44        {
45           // return default value on error
46           s_logger.debug("Expected String value for evaluation: " + getValue());
47        }
48        
49        return result;
50     }
51     
52     /**
53      * @see javax.faces.component.StateHolder#restoreState(javax.faces.context.FacesContext, java.lang.Object)
54      */
55     public void restoreState(FacesContext context, Object   state)
56     {
57        Object   values[] = (Object  [])state;
58        // standard component attributes are restored by the super class
59        super.restoreState(context, values[0]);
60        this.condition = (String  )values[1];
61     }
62     
63     /**
64      * @see javax.faces.component.StateHolder#saveState(javax.faces.context.FacesContext)
65      */
66     public Object   saveState(FacesContext context)
67     {
68        Object   values[] = new Object  [2];
69        // standard component attributes are saved by the super class
70        values[0] = super.saveState(context);
71        values[1] = this.condition;
72        return (values);
73     }
74     
75     /**
76      * Get the string condition to match value against
77      * 
78      * @return the string condition to match value against
79      */
80     public String   getCondition()
81     {
82        ValueBinding vb = getValueBinding("condition");
83        if (vb != null)
84        {
85           this.condition = (String  )vb.getValue(getFacesContext());
86        }
87        
88        return this.condition;
89     }
90     
91     /**
92      * Set the string condition to match value against
93      * 
94      * @param condition     string condition to match value against
95      */
96     public void setCondition(String   condition)
97     {
98        this.condition = condition;
99     }
100    
101    
102    /** the string condition to match value against */
103    private String   condition = null;
104 }
105
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