/*
* $Id: PrefixedPatternDefinitionResolver.java 823662 2009-10-09 18:48:03Z apetrelli $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.tiles.definition.pattern;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.tiles.Definition;
import org.apache.tiles.Expression;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This resolver allows the use of multiple pattern matching languages. The
* syntax of definition names must be <code>LANGUAGENAME:expression</code>.<br>
* The different languages must be registered through the use of
* {@link #registerDefinitionPatternMatcherFactory(String, DefinitionPatternMatcherFactory)}
* method before using this resolver.
*
* @param <T> The type of the customization key.
* @version $Rev: 823662 $ $Date: 2009-10-09 20:48:03 +0200 (ven, 09 ott 2009) $
* @since 2.2.0
*/
public class PrefixedPatternDefinitionResolver<T> extends
AbstractPatternDefinitionResolver<T> {
/**
* The logging object.
*/
private Logger logger = LoggerFactory.getLogger(getClass());
/**
* Matches languages names to the corresponding
* {@link DefinitionPatternMatcherFactory}.
*/
private Map<String, DefinitionPatternMatcherFactory> language2matcherFactory;
/**
* Constructor.
*
* @since 2.2.0
*/
public PrefixedPatternDefinitionResolver() {
language2matcherFactory = new HashMap<String, DefinitionPatternMatcherFactory>();
}
/**
* Registers a {@link DefinitionPatternMatcherFactory} connected to a
* particular language.
*
* @param language The name of the language.
* @param factory The pattern matcher factory to register.
* @since 2.2.0
*/
public void registerDefinitionPatternMatcherFactory(String language,
DefinitionPatternMatcherFactory factory) {
language2matcherFactory.put(language, factory);
}
/** {@inheritDoc} */
@Override
protected Map<String, Definition> addDefinitionsAsPatternMatchers(
List<DefinitionPatternMatcher> matchers,
Map<String, Definition> defsMap) {
Set<String> excludedKeys = new LinkedHashSet<String>();
for (Map.Entry<String, Definition> entry : defsMap.entrySet()) {
String key = entry.getKey();
Expression expression = Expression
.createExpressionFromDescribedExpression(key);
if (expression.getLanguage() != null) {
DefinitionPatternMatcherFactory factory = language2matcherFactory
.get(expression.getLanguage());
if (factory != null) {
DefinitionPatternMatcher matcher = factory
.createDefinitionPatternMatcher(expression
.getExpression(), new Definition(entry
.getValue()));
matchers.add(matcher);
} else {
logger.warn("Cannot find a DefinitionPatternMatcherFactory for expression '"
+ key + "'");
}
} else {
excludedKeys.add(key);
}
}
return PatternUtil.createExtractedMap(defsMap, excludedKeys);
}
}