/*
 * $Id:  $
 *
 * 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.struts.annotations.taglib.apt;

import java.util.Arrays;
import java.util.Collection;
import java.util.Set;

import com.sun.mirror.apt.AnnotationProcessor;
import com.sun.mirror.apt.AnnotationProcessorEnvironment;
import com.sun.mirror.apt.AnnotationProcessorFactory;
import com.sun.mirror.apt.AnnotationProcessors;
import com.sun.mirror.declaration.AnnotationTypeDeclaration;

public class TLDAnnotationProcessorFactory implements
        AnnotationProcessorFactory {

    /**
     * Returns a TLD annotation processor.
     * 
     * @return An annotation processor for note annotations if requested,
     *         otherwise, returns the NO_OP annotation processor.
     */
    public AnnotationProcessor getProcessorFor(
            Set<AnnotationTypeDeclaration> declarations,
            AnnotationProcessorEnvironment env) {
        AnnotationProcessor result;
        if (declarations.isEmpty()) {
            result = AnnotationProcessors.NO_OP;
        } else {
            result = new TagAnnotationProcessor(env);
        }
        return result;
    }

    /**
     * This factory builds a processor for Tag and TagAttribute
     * 
     * @return a collection containing StutsTag and StrutsTagAttribute
     */
    public Collection<String> supportedAnnotationTypes() {
        return Arrays.asList(TagAnnotationProcessor.TAG,
                TagAnnotationProcessor.TAG_ATTRIBUTE,
                TagAnnotationProcessor.TAG_SKIP_HIERARCHY);
    }

    /**
     * Options used to generate the TLD
     * 
     * @return an empty list.
     */
    public Collection<String> supportedOptions() {
        return Arrays.asList("-AoutFile", "-AtlibVersion", "-AjspVersion",
                "-AshortName", "-Auri", "-Adescription", "-AdisplayName",
                "-outTemplatesDir");
    }
}