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Apache CXF Runtime Aegis Databinding
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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.cxf.aegis;

import java.util.logging.Logger;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamWriter;

import org.apache.cxf.aegis.type.AegisType;
import org.apache.cxf.aegis.type.TypeCreator;
import org.apache.cxf.aegis.type.TypeUtil;
import org.apache.cxf.aegis.xml.MessageWriter;
import org.apache.cxf.aegis.xml.stax.ElementWriter;
import org.apache.cxf.common.i18n.Message;
import org.apache.cxf.common.logging.LogUtils;

public class AegisXMLStreamDataWriter extends AbstractAegisIoImpl implements AegisWriter {

    private static final Logger LOG = LogUtils.getL7dLogger(AegisXMLStreamDataWriter.class);

    AegisXMLStreamDataWriter(AegisContext globalContext) {
        super(globalContext);
    }

    /**
     * Write an object to the output. This method always writes xsi:type attributes.
     * @param obj The object to write.
     * @param elementName the QName of the XML Element.
     * @param optional set this for minOccurs = 0. It omits null elements.
     * @param output the output stream
     * @param aegisType the aegis type. This may be null if the object is non-null
     * and the type of the object is covered in the mapping. Warning, for collections
     * this will not do what you want, you must call the alternative version of
     * write that takes a {@link java.lang.reflect.Type}.
     * @throws Exception
     */
    public void write(Object obj,
                      QName elementName,
                      boolean optional,
                      XMLStreamWriter output,
                      AegisType aegisType) throws Exception {

        if (obj == null && aegisType == null && !optional) {
            Message message = new Message("WRITE_NULL_NEEDS_TYPE", LOG);
            throw new DatabindingException(message);
        }

        if (obj != null && aegisType == null) {
            aegisType = getContext().getTypeMapping().getType(obj.getClass());
            if (aegisType == null) {
                TypeCreator creator = getContext().getTypeMapping().getTypeCreator();
                aegisType = creator.createType(obj.getClass());
            }
        }

        if (obj != null) {
            // look for overrides declared in the context.
            aegisType = TypeUtil.getWriteType(aegisContext, obj, aegisType);
        }

        if (aegisType == null) {
            Message message = new Message("WRITE_NEEDS_TYPE", LOG, obj);
            throw new DatabindingException(message);
        }

        if (obj == null) {
            if (optional) { // minOccurs = 0
                return;
            }
            if (aegisType.isNillable() && aegisType.isWriteOuter()) {
                ElementWriter writer = new ElementWriter(output);
                MessageWriter w2 = writer.getElementWriter(elementName);
                w2.writeXsiNil();
                w2.close();
                return;
            }
        }

        ElementWriter writer = new ElementWriter(output);
        MessageWriter w2 = writer.getElementWriter(elementName);
        if (getContext().isWriteXsiTypes()
            && aegisType.getSchemaType() != null) {
            // if we know the type, write it. We are standalone, and the reader needs it.
            w2.writeXsiType(aegisType.getSchemaType());
        }
        aegisType.writeObject(obj, w2, context);
        w2.close();
    }

    /**
     * {@inheritDoc}
     */
    public void write(Object obj, QName elementName, boolean optional, XMLStreamWriter output,
                      java.lang.reflect.Type objectType) throws Exception {
        AegisType aegisType = null;
        if (objectType instanceof Class) {
            aegisType = getContext().getTypeMapping().getType(objectType);
        }
        if (aegisType == null) {
            TypeCreator creator = getContext().getTypeMapping().getTypeCreator();
            aegisType = creator.createType(objectType);
        }

        if (aegisType == null) {
            Message message = new Message("NO_MAPPING_FOR_TYPE", LOG, objectType);
            throw new DatabindingException(message);
        }
        write(obj, elementName, optional, output, aegisType);

    }
}