org.primefaces.expression.SearchExpressionResolverFactory Maven / Gradle / Ivy
/*
* Copyright 2009-2013 PrimeTek.
*
* 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.
*/
package org.primefaces.expression;
import java.util.HashMap;
import javax.faces.FacesException;
import org.primefaces.expression.impl.AllExpressionResolver;
import org.primefaces.expression.impl.ChildExpressionResolver;
import org.primefaces.expression.impl.CompositeExpressionResolver;
import org.primefaces.expression.impl.FormExpressionResolver;
import org.primefaces.expression.impl.IdExpressionResolver;
import org.primefaces.expression.impl.NamingContainerExpressionResolver;
import org.primefaces.expression.impl.NextExpressionResolver;
import org.primefaces.expression.impl.ParentExpressionResolver;
import org.primefaces.expression.impl.PreviousExpressionResolver;
import org.primefaces.expression.impl.ThisExpressionResolver;
/**
* Factory for providing different {@link SearchExpressionResolver} for expressions.
*/
public class SearchExpressionResolverFactory {
private static final HashMap RESOLVER_MAPPING = new HashMap();
private static final IdExpressionResolver ID_EXPRESSION_RESOLVER = new IdExpressionResolver();
static {
RESOLVER_MAPPING.put(SearchExpressionConstants.THIS_KEYWORD, new ThisExpressionResolver());
RESOLVER_MAPPING.put(SearchExpressionConstants.COMPOSITE_KEYWORD, new CompositeExpressionResolver());
RESOLVER_MAPPING.put(SearchExpressionConstants.PARENT_KEYWORD, new ParentExpressionResolver());
RESOLVER_MAPPING.put(SearchExpressionConstants.FORM_KEYWORD, new FormExpressionResolver());
RESOLVER_MAPPING.put(SearchExpressionConstants.ALL_KEYWORD, new AllExpressionResolver());
RESOLVER_MAPPING.put(SearchExpressionConstants.NAMINGCONTAINER_KEYWORD, new NamingContainerExpressionResolver());
RESOLVER_MAPPING.put(SearchExpressionConstants.NONE_KEYWORD, new NamingContainerExpressionResolver());
RESOLVER_MAPPING.put(SearchExpressionConstants.NEXT_KEYWORD, new NextExpressionResolver());
RESOLVER_MAPPING.put(SearchExpressionConstants.PREVIOUS_KEYWORD, new PreviousExpressionResolver());
RESOLVER_MAPPING.put(SearchExpressionConstants.CHILD_KEYWORD, new ChildExpressionResolver());
}
/**
* Finds a {@link SearchExpressionResolver} for the given expression.
*
* @param expression The search expression.
* @return The {@link SearchExpressionResolver}.
*/
public static SearchExpressionResolver findResolver(final String expression) {
SearchExpressionResolver resolver = null;
if (expression.startsWith(SearchExpressionConstants.KEYWORD_PREFIX)) {
// check if it's an expression with parameter
int parenthesisPosition = expression.indexOf('(');
if (parenthesisPosition > 0) {
String expressionWithoutParam = expression.substring(0, parenthesisPosition);
resolver = RESOLVER_MAPPING.get(expressionWithoutParam);
}
else {
resolver = RESOLVER_MAPPING.get(expression);
}
}
else {
// if it's not a keyword, take it as id
resolver = ID_EXPRESSION_RESOLVER;
}
if (resolver == null) {
throw new FacesException("No SearchExpressionResolver avialable for expression \"" + expression + "\"");
}
return resolver;
}
public static void registerResolver(final String keyword, final SearchExpressionResolver resolver) {
RESOLVER_MAPPING.put(keyword, resolver);
}
public static SearchExpressionResolver removeResolver(final String keyword) {
return RESOLVER_MAPPING.remove(keyword);
}
/**
* Prevent instantiation.
*/
private SearchExpressionResolverFactory() {
}
}