org.lunarray.model.descriptor.builder.annotation.base.listener.operation.parameter.collection.SetCollectionTypeListener.java Source code

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Here is the source code for org.lunarray.model.descriptor.builder.annotation.base.listener.operation.parameter.collection.SetCollectionTypeListener.java

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/* 
 * Model Tools.
 * Copyright (C) 2013 Pal Hargitai (pal@lunarray.org)
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.lunarray.model.descriptor.builder.annotation.base.listener.operation.parameter.collection;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.Deque;
import java.util.LinkedList;

import org.apache.commons.lang.Validate;
import org.lunarray.common.event.EventException;
import org.lunarray.common.event.Listener;
import org.lunarray.common.generics.GenericsUtil;
import org.lunarray.model.descriptor.accessor.operation.parameter.DescribedParameter;
import org.lunarray.model.descriptor.builder.annotation.base.build.context.AnnotationBuilderContext;
import org.lunarray.model.descriptor.builder.annotation.base.build.operation.AnnotationCollectionParameterDescriptorBuilder;
import org.lunarray.model.descriptor.builder.annotation.base.listener.events.UpdatedParameterEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Sets the collection type.
 * 
 * @author Pal Hargitai (pal@lunarray.org)
 * @param <P>
 *            The property type.
 * @param <C>
 *            The collection type.
 * @param <B>
 *            The builder context type.
 */
public final class SetCollectionTypeListener<C, P extends Collection<C>, B extends AnnotationBuilderContext>
        implements Listener<UpdatedParameterEvent<P, B>> {

    /** The logger. */
    private static final Logger LOGGER = LoggerFactory.getLogger(SetCollectionTypeListener.class);

    /** Default constructor. */
    public SetCollectionTypeListener() {
        // Default constructor.
    }

    /** {@inheritDoc} */
    @Override
    public void handleEvent(final UpdatedParameterEvent<P, B> event) throws EventException {
        SetCollectionTypeListener.LOGGER.debug("Handling event {}", event);
        Validate.notNull(event, "Event may not be null.");
        @SuppressWarnings("unchecked")
        final AnnotationCollectionParameterDescriptorBuilder<C, P, B> builder = (AnnotationCollectionParameterDescriptorBuilder<C, P, B>) event
                .getBuilder();
        final Class<?> collectionType;
        final Deque<DescribedParameter<?>> params = new LinkedList<DescribedParameter<?>>();
        params.add(event.getParameter());
        final java.lang.reflect.Type tmpType = GenericsUtil.getPropertyGenericType(Collection.class, 0, params);
        if (tmpType instanceof Class) {
            collectionType = (Class<?>) tmpType;
        } else if (tmpType instanceof ParameterizedType) {
            final ParameterizedType ptype = (ParameterizedType) tmpType;
            final Type rawType = ptype.getRawType();
            if (rawType instanceof Class) {
                collectionType = (Class<?>) rawType;
            } else {
                collectionType = Object.class;
            }
        } else {
            collectionType = Object.class;
        }
        builder.collectionType(collectionType);
    }
}