Deserializer.java
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上传日期:2018-01-08
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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.hadoop.io.serializer;
- import java.io.IOException;
- import java.io.InputStream;
- /**
- * <p>
- * Provides a facility for deserializing objects of type <T> from an
- * {@link InputStream}.
- * </p>
- *
- * <p>
- * Deserializers are stateful, but must not buffer the input since
- * other producers may read from the input between calls to
- * {@link #deserialize(Object)}.
- * </p>
- * @param <T>
- */
- public interface Deserializer<T> {
- /**
- * <p>Prepare the deserializer for reading.</p>
- */
- void open(InputStream in) throws IOException;
-
- /**
- * <p>
- * Deserialize the next object from the underlying input stream.
- * If the object <code>t</code> is non-null then this deserializer
- * <i>may</i> set its internal state to the next object read from the input
- * stream. Otherwise, if the object <code>t</code> is null a new
- * deserialized object will be created.
- * </p>
- * @return the deserialized object
- */
- T deserialize(T t) throws IOException;
-
- /**
- * <p>Close the underlying input stream and clear up any resources.</p>
- */
- void close() throws IOException;
- }