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/*******************************************************************************
 * Copyright (c) 2015-2018 Skymind, Inc.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 which is available at
 * https://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.
 *
 * SPDX-License-Identifier: Apache-2.0
 ******************************************************************************/

package org.datavec.api.io.serializers;

import java.io.IOException;
import java.io.InputStream;

/**
 * 
 * Provides a facility for deserializing objects of type  from an
 * {@link InputStream}.
 * 
 *
 * 
 * Deserializers are stateful, but must not buffer the input since
 * other producers may read from the input between calls to
 * {@link #deserialize(Object)}.
 * 
 * @param 
 */
public interface Deserializer {
    /**
     * Prepare the deserializer for reading.
     */
    void open(InputStream in) throws IOException;

    /**
     * 
     * Deserialize the next object from the underlying input stream.
     * If the object t is non-null then this deserializer
     * may set its internal state to the next object read from the input
     * stream. Otherwise, if the object t is null a new
     * deserialized object will be created.
     * 
     * @return the deserialized object
     */
    T deserialize(T t) throws IOException;

    /**
     * Close the underlying input stream and clear up any resources.
     */
    void close() throws IOException;
}