/*
* 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.cocoon.components.variables;
import org.apache.cocoon.sitemap.PatternException;
/**
* This factory component creates a {@link VariableResolver} for an expression.
* A {@link VariableResolver} can then be used at runtime to resolve
* a variable with the current value.
* A variable can contain dynamic parts that are contained in {...},
*
* NOTE: This interface is work in progress, so chances are that it will
* change.
*
* @author <a href="mailto:cziegeler@apache.org">Carsten Ziegeler</a>
*
* @version CVS $Id$
*/
public interface VariableResolverFactory {
String ROLE = VariableResolverFactory.class.getName();
/**
* Get a resolver for a given expression. Chooses the most efficient implementation
* depending on <code>expression</code>.
* Don't forget to release the resolver
*/
VariableResolver lookup(String expression)
throws PatternException;
void release(VariableResolver resolver);
}