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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.databinding;

import javax.xml.namespace.QName;
import org.apache.cxf.service.model.MessagePartInfo;

/**
 * The 'read' side of the data binding abstraction of CXF. A DataReader<T> reads objects 
 * from a source of type T.
 * @param  The type of the source. Each data binding defines the set of source types that it supports.
 */
public interface DataReader extends BaseDataReader {
    /**
     * Read an object from the input.
     * @param input input source object.
     * @return item read.
     */
    Object read(T input);
    /**
     * Read an object from the input, applying additional conventions based on the WSDL message
     * part.
     * @param part The message part for this item. If null, this API is equivalent to
     * {@link #read(Object)}.
     * @param input input source object.
     * @return item read.
     */
    Object read(MessagePartInfo part, T input);
    /**
     * Read an object from the input. In the current version of CXF, not all binding support
     * this API, and those that do ignore the element QName parameter.
     * @param elementQName expected element. Generally ignored.
     * @param input input source object.
     * @param type the type of object required/requested. This is generally used 
     * when the caller wants to receive a raw source object and avoid any binding processing.
     * For example, passing javax.xml.transform.Source. The bindings do not necessarily throw
     * if they cannot provide an object of the requested type, and will apply their normal
     * mapping processing, instead.
     * @return item read.
     */
    Object read(QName elementQName, T input, Class type);
}