/**
 * 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.camel.component.xquery;

import java.lang.annotation.Annotation;

import org.w3c.dom.Node;

import net.sf.saxon.functions.Collection;

import org.apache.camel.CamelContext;
import org.apache.camel.Expression;
import org.apache.camel.component.bean.DefaultAnnotationExpressionFactory;
import org.apache.camel.language.LanguageAnnotation;
import org.apache.camel.language.NamespacePrefix;

/**
 * @version $Revision$
 */
public class XQueryAnnotationExpressionFactory extends DefaultAnnotationExpressionFactory {

    @SuppressWarnings("unchecked")
    @Override
    public Expression createExpression(CamelContext camelContext, Annotation annotation,
                                       LanguageAnnotation languageAnnotation, Class expressionReturnType) {
        String xQuery = getExpressionFromAnnotation(annotation);
        XQueryBuilder builder = XQueryBuilder.xquery(xQuery);
        if (annotation instanceof XQuery) {
            XQuery xQueryAnnotation = (XQuery)annotation;
            builder.setStripsAllWhiteSpace(xQueryAnnotation.stripsAllWhiteSpace());

            NamespacePrefix[] namespaces = xQueryAnnotation.namespaces();
            if (namespaces != null) {
                for (NamespacePrefix namespacePrefix : namespaces) {
                    builder = builder.namespace(namespacePrefix.prefix(), namespacePrefix.uri());
                }
            }
        }
        if (expressionReturnType.isAssignableFrom(String.class)) {
            builder.setResultsFormat(ResultFormat.String);
        } else if (expressionReturnType.isAssignableFrom(Collection.class)) {
            builder.setResultsFormat(ResultFormat.List);
        } else if (expressionReturnType.isAssignableFrom(Node.class)) {
            builder.setResultsFormat(ResultFormat.DOM);
        } else if (expressionReturnType.isAssignableFrom(byte[].class)) {
            builder.setResultsFormat(ResultFormat.Bytes);
        }
        return builder;
    }

}
