Source Code Cross Referenced for FieldValidatorSource.java in  » Library » Tapestry » org » apache » tapestry » services » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry.services 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        // Copyright 2006 The Apache Software Foundation
02:        //
03:        // Licensed under the Apache License, Version 2.0 (the "License");
04:        // you may not use this file except in compliance with the License.
05:        // You may obtain a copy of the License at
06:        //
07:        //     http://www.apache.org/licenses/LICENSE-2.0
08:        //
09:        // Unless required by applicable law or agreed to in writing, software
10:        // distributed under the License is distributed on an "AS IS" BASIS,
11:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12:        // See the License for the specific language governing permissions and
13:        // limitations under the License.
14:
15:        package org.apache.tapestry.services;
16:
17:        import java.util.Locale;
18:
19:        import org.apache.tapestry.Field;
20:        import org.apache.tapestry.FieldValidator;
21:        import org.apache.tapestry.Validator;
22:        import org.apache.tapestry.corelib.components.BeanEditForm;
23:        import org.apache.tapestry.ioc.Messages;
24:
25:        /**
26:         * Used to create {@link FieldValidator}s for a particular {@link Field} component.
27:         */
28:        public interface FieldValidatorSource {
29:            /**
30:             * Creates the validator. The error message associated with the field validator usually comes
31:             * from the {@link ValidationMessagesSource} (using the validator's
32:             * {@link Validator#getMessageKey() message key}). However, if the container component of the
33:             * field defines a message key <code><i>id</i>-<i>validator</i>
34:             * (where id is the simple id of the field component, and validator is the validatorType), then that
35:             * message is used instead. This allows you to override the message for a particular validation of a particular field.
36:             * 
37:             * @param field
38:             *            the field for which a validator is to be created
39:             * @param validatorType
40:             *            used to select the {@link Validator} that forms the core of the
41:             *            {@link FieldValidator}
42:             * @param constraintValue
43:             *            a value used to configure the validator, or null if the validator is not
44:             *            configurarable
45:             * @return the field validator for the field
46:             */
47:            FieldValidator createValidator(Field field, String validatorType,
48:                    String constraintValue);
49:
50:            /**
51:             * Full featured version of {@link #createValidator(Field, String, String)} used in situations
52:             * where the container of the field is not necesarrilly the place to look for override messages,
53:             * and the id of the field is not the key to use when checking. The {@link BeanEditForm} is an
54:             * example of this.
55:             * 
56:             * @param field
57:             *            the field for which a validator is to be created
58:             * @param validatorType
59:             *            used to select the {@link Validator} that forms the core of the
60:             *            {@link FieldValidator}
61:             * @param constraintValue
62:             *            a value used to configure the validator, or null if the validator is not
63:             *            configurable
64:             * @param overrideId
65:             *            the base id used when searching for validator message overrides (this would
66:             *            normally be the field component's simple id)
67:             * @param overrideMessages
68:             *            the message catalog to search for override messages (this would normally be the
69:             *            catalog for the container of the field component)
70:             * @param locale
71:             *            locale used when retrieving default validation messages from the
72:             *            {@link ValidationMessagesSource}
73:             * @return the field validator for the field
74:             */
75:            FieldValidator createValidator(Field field, String validatorType,
76:                    String constraintValue, String overrideId,
77:                    Messages overrideMessages, Locale locale);
78:
79:            /**
80:             * Creates a set of validators. The specification is a string used to identify and configure the
81:             * individual validators. The specification is a comma-separated list of terms. Each term is a
82:             * validator type name and an optional constraint value (seperated by an equals sign).
83:             * 
84:             * @param field
85:             * @param specification
86:             * @return a composite field validator
87:             */
88:            FieldValidator createValidators(Field field, String specification);
89:        }
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