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/**
 * Copyright © 2010-2013 Nokia
 *
 * 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 com.googlecode.jsonschema2pojo;

/**
 * Factory object for creating {@link Annotator}s for all the supported
 * annotation styles.
 */
public class AnnotatorFactory {

    /**
     * Create a new {@link Annotator} that can create annotations according to
     * the given style.
     * 
     * @param style
     *            the annotation style that dictates what kind of annotations
     *            are required.
     */
    public Annotator getAnnotator(AnnotationStyle style) {

        switch (style) {
            case JACKSON:
            case JACKSON2:
                return new Jackson2Annotator();
            case JACKSON1:
                return new Jackson1Annotator();
            case GSON:
                return new GsonAnnotator();
            case NONE:
                return new NoopAnnotator();
            default:
                throw new IllegalArgumentException("Unrecognised annotation style: " + style);
        }

    }

    /**
     * Create a new custom {@link Annotator} from the given class.
     * 
     * @param clazz
     *            A class implementing {@link Annotator}.
     */
    public Annotator getAnnotator(Class clazz) {

        if (!Annotator.class.isAssignableFrom(clazz)) {
            throw new IllegalArgumentException("The class name given as a custom annotator (" + clazz.getName() + ") does not refer to a class that implements " + Annotator.class.getName());
        }

        try {
            return clazz.newInstance();
        } catch (InstantiationException e) {
            throw new IllegalArgumentException("Failed to create a custom annotator from the given class. An exception was thrown on trying to create a new instance.", e.getCause());
        } catch (IllegalAccessException e) {
            throw new IllegalArgumentException("Failed to create a custom annotator from the given class. It appears that we do not have access to this class - is both the class and its no-arg constructor marked public?", e);
        }

    }

}