/*
 * Copyright (c) 2005, 2006, 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.bind.v2.runtime.property;

import java.io.IOException;

import javax.xml.stream.XMLStreamException;

import com.sun.xml.internal.bind.api.AccessorException;
import com.sun.xml.internal.bind.v2.model.core.PropertyKind;
import com.sun.xml.internal.bind.v2.model.runtime.RuntimeElementPropertyInfo;
import com.sun.xml.internal.bind.v2.model.runtime.RuntimeTypeRef;
import com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl;
import com.sun.xml.internal.bind.v2.runtime.Name;
import com.sun.xml.internal.bind.v2.runtime.XMLSerializer;
import com.sun.xml.internal.bind.v2.runtime.reflect.Accessor;
import com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor;
import com.sun.xml.internal.bind.v2.runtime.unmarshaller.ChildLoader;
import com.sun.xml.internal.bind.v2.runtime.unmarshaller.DefaultValueLoaderDecorator;
import com.sun.xml.internal.bind.v2.runtime.unmarshaller.LeafPropertyLoader;
import com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader;
import com.sun.xml.internal.bind.v2.runtime.unmarshaller.XsiNilLoader;
import com.sun.xml.internal.bind.v2.util.QNameMap;

import org.xml.sax.SAXException;

/**
 * {@link Property} that contains a leaf value.
 *
 * @author Kohsuke Kawaguchi (kk@kohsuke.org)
 */
final class SingleElementLeafProperty<BeanT> extends PropertyImpl<BeanT> {

    private final Name tagName;
    private final boolean nillable;
    private final Accessor acc;
    private final String defaultValue;
    private final TransducedAccessor<BeanT> xacc;

    public SingleElementLeafProperty(JAXBContextImpl context, RuntimeElementPropertyInfo prop) {
        super(context,prop);
        RuntimeTypeRef ref = prop.getTypes().get(0);
        tagName = context.nameBuilder.createElementName(ref.getTagName());
        assert tagName!=null;
        nillable = ref.isNillable();
        defaultValue = ref.getDefaultValue();
        this.acc = prop.getAccessor().optimize(context);

        xacc = TransducedAccessor.get(context,ref);
        assert xacc!=null;
    }

    public void reset(BeanT o) throws AccessorException {
        acc.set(o,null);
    }

    public String getIdValue(BeanT bean) throws AccessorException, SAXException {
        return xacc.print(bean).toString();
    }

    public void serializeBody(BeanT o, XMLSerializer w, Object outerPeer) throws SAXException, AccessorException, IOException, XMLStreamException {
        boolean hasValue = xacc.hasValue(o);
        if(hasValue) {
            xacc.writeLeafElement(w, tagName, o, fieldName);
        } else
        if(nillable) {
            w.startElement(tagName,null);
            w.writeXsiNilTrue();
            w.endElement();
        }
    }

    public void buildChildElementUnmarshallers(UnmarshallerChain chain, QNameMap<ChildLoader> handlers) {
        Loader l = new LeafPropertyLoader(xacc);
        if(defaultValue!=null)
            l = new DefaultValueLoaderDecorator(l,defaultValue);
        if(nillable || chain.context.allNillable)
            l = new XsiNilLoader.Single(l,acc);
        handlers.put(tagName,new ChildLoader(l,null));
    }


    public PropertyKind getKind() {
        return PropertyKind.ELEMENT;
    }

    @Override
    public Accessor getElementPropertyAccessor(String nsUri, String localName) {
        if(tagName.equals(nsUri,localName))
            return acc;
        else
            return null;
    }
}
