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Java > Open Source Codes > org > apache > turbine > services > intake > model > LongField


1 package org.apache.turbine.services.intake.model;
2
3 /*
4  * Copyright 2001-2004 The Apache Software Foundation.
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License")
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18
19 import org.apache.commons.lang.StringUtils;
20
21 import org.apache.turbine.services.intake.IntakeException;
22 import org.apache.turbine.services.intake.validator.LongValidator;
23 import org.apache.turbine.services.intake.xmlmodel.XmlField;
24
25 /**
26  * Processor for long fields.
27  *
28  * @author <a HREF="mailto:jmcnally@collab.net>John McNally</a>
29  * @author <a HREF="mailto:Colin.Chalmers@maxware.nl">Colin Chalmers</a>
30  * @version $Id: LongField.java,v 1.3.2.6 2004/05/20 03:16:39 seade Exp $
31  */
32 public class LongField
33         extends Field
34 {
35
36     /**
37      * Constructor.
38      *
39      * @param field xml field definition object
40      * @param group xml group definition object
41      * @throws IntakeException thrown by superclass
42      */
43     public LongField(XmlField field, Group group)
44             throws IntakeException
45     {
46         super(field, group);
47     }
48
49     /**
50      * Sets the default value for an Long Field
51      *
52      * @param prop Parameter for the default values
53      */
54     public void setDefaultValue(String JavaDoc prop)
55     {
56         defaultValue = null;
57
58         if (prop == null)
59         {
60             return;
61         }
62
63         defaultValue = new Long JavaDoc(prop);
64     }
65
66     /**
67      * Set the empty Value. This value is used if Intake
68      * maps a field to a parameter returned by the user and
69      * the corresponding field is either empty (empty string)
70      * or non-existant.
71      *
72      * @param prop The value to use if the field is empty.
73      */
74     public void setEmptyValue(String JavaDoc prop)
75     {
76         emptyValue = null;
77
78         if (prop == null)
79         {
80             return;
81         }
82
83         emptyValue = new Long JavaDoc(prop);
84     }
85
86     /**
87      * Provides access to emptyValue such that the value returned will be
88      * acceptable as an argument parameter to Method.invoke. Subclasses
89      * that deal with primitive types should ensure that they return an
90      * appropriate value wrapped in the object wrapper class for the
91      * primitive type.
92      *
93      * @return the value to use when the field is empty or an Object that
94      * wraps the empty value for primitive types.
95      */
96     protected Object JavaDoc getSafeEmptyValue()
97     {
98         if (isMultiValued)
99         {
100             return new long[0];
101         }
102         else
103         {
104             return (null == getEmptyValue()) ? new Long JavaDoc(0l) : getEmptyValue();
105         }
106     }
107
108     /**
109      * A suitable validator.
110      *
111      * @return A suitable validator
112      */
113     protected String JavaDoc getDefaultValidator()
114     {
115         return LongValidator.class.getName();
116     }
117
118     /**
119      * Sets the value of the field from data in the parser.
120      */
121     protected void doSetValue()
122     {
123         if (isMultiValued)
124         {
125             String JavaDoc[] inputs = parser.getStrings(getKey());
126             long[] values = new long[inputs.length];
127             for (int i = 0; i < inputs.length; i++)
128             {
129                 values[i] = StringUtils.isNotEmpty(inputs[i])
130                         ? new Long JavaDoc(inputs[i]).longValue()
131                         : ((Long JavaDoc) getEmptyValue()).longValue();
132             }
133             setTestValue(values);
134         }
135         else
136         {
137             String JavaDoc val = parser.getString(getKey());
138             setTestValue(StringUtils.isNotEmpty(val)
139                     ? new Long JavaDoc(val) : (Long JavaDoc) getEmptyValue());
140         }
141     }
142     
143 }
144
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