/*
 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.xml.internal.ws.spi.db;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.NoSuchElementException;

import javax.xml.bind.JAXBException;
import javax.xml.bind.attachment.AttachmentMarshaller;
import javax.xml.bind.attachment.AttachmentUnmarshaller;
import javax.xml.namespace.NamespaceContext;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.transform.Result;
import javax.xml.transform.Source;

import org.w3c.dom.Node;
import org.xml.sax.ContentHandler;

/**
 * RepeatedElementBridge
 *
 * @author shih-chang.chen@oracle.com
 */
@SuppressWarnings({"rawtypes", "unchecked"})
public class RepeatedElementBridge<T> implements XMLBridge<T> {

    XMLBridge<T> delegate;
    CollectionHandler collectionHandler;

    public RepeatedElementBridge(TypeInfo typeInfo, XMLBridge xb) {
        delegate = xb;
        collectionHandler = create(typeInfo);
    }

    public CollectionHandler collectionHandler() {
        return collectionHandler;
    }

    @Override
    public BindingContext context() {
        return delegate.context();
    }

    @Override
    public void marshal(T object, XMLStreamWriter output, AttachmentMarshaller am) throws JAXBException {
        delegate.marshal(object, output, am);
    }

    @Override
    public void marshal(T object, OutputStream output, NamespaceContext nsContext, AttachmentMarshaller am) throws JAXBException {
        delegate.marshal(object, output, nsContext, am);
    }

    @Override
    public void marshal(T object, Node output) throws JAXBException {
        delegate.marshal(object, output);
    }

    @Override
    public void marshal(T object, ContentHandler contentHandler, AttachmentMarshaller am) throws JAXBException {
        delegate.marshal(object, contentHandler, am);
    }

    @Override
    public void marshal(T object, Result result) throws JAXBException {
        delegate.marshal(object, result);
    }

    @Override
    public T unmarshal(XMLStreamReader in, AttachmentUnmarshaller au) throws JAXBException {
        return delegate.unmarshal(in, au);
    }

    @Override
    public T unmarshal(Source in, AttachmentUnmarshaller au) throws JAXBException {
        return delegate.unmarshal(in, au);
    }

    @Override
    public T unmarshal(InputStream in) throws JAXBException {
        return delegate.unmarshal(in);
    }

    @Override
    public T unmarshal(Node n, AttachmentUnmarshaller au) throws JAXBException {
        return delegate.unmarshal(n, au);
    }

    @Override
    public TypeInfo getTypeInfo() {
        return delegate.getTypeInfo();
    }

    @Override
    public boolean supportOutputStream() {
        return delegate.supportOutputStream();
    }

    static public interface CollectionHandler {
        int getSize(Object c);
        Iterator iterator(Object c);
        Object convert(List list);
    }

    static class BaseCollectionHandler implements CollectionHandler {
        Class type;
        BaseCollectionHandler(Class c) {type = c;}
        @Override
        public int getSize(Object c) { return ((Collection) c).size(); }
        @Override
        public Object convert(List list) {
            try {
                Object o = type.newInstance();
                ((Collection)o).addAll(list);
                return o;
            } catch (Exception e) {
                e.printStackTrace();
            }
            return list;
        }
        @Override
        public Iterator iterator(Object c) {return ((Collection)c).iterator();}
    }

    static final CollectionHandler ListHandler = new BaseCollectionHandler(List.class) {
        @Override
        public Object convert(List list) {return list;}
    };

    static final CollectionHandler HashSetHandler = new BaseCollectionHandler(HashSet.class) {
        @Override
        public Object convert(List list) { return new HashSet(list);}
    };

    static public CollectionHandler create(TypeInfo ti) {
        Class javaClass = (Class) ti.type;
        if (javaClass.isArray()) {
            return new ArrayHandler((Class) ti.getItemType().type);
        } else if (List.class.equals(javaClass) || Collection.class.equals(javaClass)) {
            return ListHandler;
        } else if (Set.class.equals(javaClass) || HashSet.class.equals(javaClass)) {
            return HashSetHandler;
        } else {
            return new BaseCollectionHandler(javaClass);
        }
    }

    static class ArrayHandler implements CollectionHandler {
        Class componentClass;
        public ArrayHandler(Class component) {
            componentClass = component;
        }
        @Override
        public int getSize(Object c) {
            return java.lang.reflect.Array.getLength(c);
        }
        @Override
        public Object convert(List list) {
            Object array = java.lang.reflect.Array.newInstance(componentClass, list.size());
            for (int i = 0; i < list.size(); i++) {
                java.lang.reflect.Array.set(array, i, list.get(i));
            }
            return array;
        }
        @Override
        public Iterator iterator(final Object c) {
            return new Iterator() {
                int index = 0;
                @Override
                public boolean hasNext() {
                    if (c == null || java.lang.reflect.Array.getLength(c) == 0) {
                        return false;
                    }
                    return (index != java.lang.reflect.Array.getLength(c));
                }
                @Override
                public Object next() throws NoSuchElementException {
                    Object retVal = null;
                    try {
                        retVal = java.lang.reflect.Array.get(c, index++);
                    } catch (ArrayIndexOutOfBoundsException ex) {
                        throw new NoSuchElementException();
                    }
                    return retVal;
                }
                @Override
                public void remove() {}
            };
        }
    }
}