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Copyright 2003-2004 The Apache Software Foundation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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<title>Commons</title>
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<section name="Introduction">
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A common issue when receiving data either electronically or from
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user input is verifying the integrity of the data. This work is
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repetitive and becomes even more complicated when different sets
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of validation rules need to be applied to the same set of data based
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on locale. Error messages may also vary by locale.
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This package addresses some of these issues to
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speed development and maintenance of validation rules.
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In order to use the Validator, the following basic steps are required:
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Create a new instance of the
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<code>org.apache.commons.validator.Validator</code> class. Currently
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Validator instances may be safely reused if the current
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ValidatorResources are the same, as long as you have completed any
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previous validation, and you do not try to utilize a particular
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Validator instance from more than one thread at a time.
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Add any resources needed to perform the validations, such as the
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Call the validate method on
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<code>org.apache.commons.validator.Validator</code>.
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For more information, see the <a href="apidocs/index.html">JavaDocs</a>.
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<section name="Features">
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<p>Validator provides two distinct sets of functionality:</p>
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<li>A configurable (typically XML) validation engine</li>
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<li>Reusable "primitive" validation methods</li>
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Your validation methods are plugged into the engine and
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executed against your data. Often, these methods use
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resources specific to one application or framework so Commons
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Validator doesn't directly provide pluggable validator actions.
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However, it does have a set of common validation methods
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(email addresses, dates, URLs, etc.) that help in creating
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xdocs/index.xml
