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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * 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.fabric3.implementation.pojo.builder;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.fabric3.spi.container.objectfactory.ObjectFactory;
import org.fabric3.spi.container.objectfactory.SingletonObjectFactory;
import org.fabric3.spi.model.type.java.JavaGenericType;
import org.fabric3.spi.model.type.java.JavaType;
import org.fabric3.spi.model.type.java.JavaTypeInfo;
import org.fabric3.spi.transform.TransformationException;
import org.fabric3.spi.transform.Transformer;
import org.fabric3.spi.transform.TransformerRegistry;
import org.oasisopen.sca.annotation.Reference;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import static org.fabric3.spi.model.type.xsd.XSDConstants.PROPERTY_TYPE;

/**
 *
 */
public class CollectionBuilderImpl extends AbstractPropertyBuilder implements CollectionBuilder {

    public CollectionBuilderImpl(@Reference TransformerRegistry registry) {
        super(registry);
    }


    @SuppressWarnings({"unchecked"})
    public  ObjectFactory> createFactory(Collection collection,
                                                          String name,
                                                          JavaGenericType dataType,
                                                          Document value,
                                                          ClassLoader classLoader) throws PropertyTransformException {
        try {
            List typeInfos = dataType.getTypeInfo().getParameterTypesInfos();
            if (typeInfos.size() < 1) {
                // programming error
                throw new PropertyTransformException("Collection properties must have a value type");
            }
            Class type = typeInfos.get(0).getRawType();

            List> types = new ArrayList<>();
            types.add(type);

            Transformer transformer = getTransformer(name, PROPERTY_TYPE, new JavaType(type), types);

            Element root = value.getDocumentElement();
            NodeList nodes = root.getChildNodes();
            for (int i = 0; i < nodes.getLength(); i++) {
                Node node = nodes.item(i).getFirstChild();
                T val = (T) transformer.transform(node, classLoader);
                collection.add(val);
            }
            return new SingletonObjectFactory<>(collection);
        } catch (TransformationException e) {
            throw new PropertyTransformException("Unable to transform property value: " + name, e);
        }
    }

}