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/*
* Copyright 2013-2014 Richard M. Hightower
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* __________ _____ __ .__
* \______ \ ____ ____ ____ /\ / \ _____ | | _|__| ____ ____
* | | _// _ \ / _ \ / \ \/ / \ / \\__ \ | |/ / |/ \ / ___\
* | | ( <_> | <_> ) | \ /\ / Y \/ __ \| <| | | \/ /_/ >
* |______ /\____/ \____/|___| / \/ \____|__ (____ /__|_ \__|___| /\___ /
* \/ \/ \/ \/ \/ \//_____/
* ____. ___________ _____ ______________.___.
* | |____ ___ _______ \_ _____/ / _ \ / _____/\__ | |
* | \__ \\ \/ /\__ \ | __)_ / /_\ \ \_____ \ / | |
* /\__| |/ __ \\ / / __ \_ | \/ | \/ \ \____ |
* \________(____ /\_/ (____ / /_______ /\____|__ /_______ / / ______|
* \/ \/ \/ \/ \/ \/
*/
package org.boon.validation.readers;
import org.boon.validation.ValidatorMetaData;
import org.boon.validation.ValidatorMetaDataReader;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* This class allows you to chain validator readers. This way you can read
* validation data from more than one source.
*
* For example, you could read validation meta data from properties files, and
* annotations.
*
* The last one configured in the chain wins if you have the same type.
*
* You can have a required validation rule
* in a properties file and a regex in an annotation for the same property and both
* applied. Thus, it also merges as long as they are different types.
*
* @author Rick Hightower
*/
public class ChainValidatorMetaDataReader implements ValidatorMetaDataReader {
public static final String OVERRIDE_NAME = "validator.override.name";
private List chain;
public void setChain( final List chain ) {
this.chain = chain;
}
public List readMetaData( final Class clazz, final String propertyName ) {
Map overrideMap = new LinkedHashMap();
/* Iterate through the chain of readers, read the validation data, put the validation data in a
* linked hash map based on the name of the validation data. As you addObject another rule with the same name
* it overrides the last. Thus, the last reader in the chain has precedence.
*/
for ( ValidatorMetaDataReader reader : chain ) {
/* Read the validation meta-data from the current reader in the chain. */
List list = reader.readMetaData( clazz, propertyName );
/* Put the validation rules in the linked hash map by name so the last reader can override
* the previous reader.
*/
for ( ValidatorMetaData data : list ) {
String overrideName = data.getName();
if ( ( data.getProperties() != null ) && ( data.getProperties().get( OVERRIDE_NAME ) != null ) ) {
overrideName = ( String ) data.getProperties().get( OVERRIDE_NAME );
data.getProperties().remove( OVERRIDE_NAME );
}
overrideMap.put( overrideName, data );
}
}
/* Turn the map into a list. */
return new ArrayList( overrideMap.values() );
}
}