org.apache.hadoop.record.RecordInput.java Source code

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Here is the source code for org.apache.hadoop.record.RecordInput.java

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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.record;

import java.io.IOException;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

/**
 * Interface that all the Deserializers have to implement.
 * 
 * @deprecated Replaced by <a href="http://hadoop.apache.org/avro/">Avro</a>.
 */
@Deprecated
@InterfaceAudience.Public
@InterfaceStability.Stable
public interface RecordInput {
    /**
     * Read a byte from serialized record.
     * @param tag Used by tagged serialization formats (such as XML)
     * @return value read from serialized record.
     */
    byte readByte(String tag) throws IOException;

    /**
     * Read a boolean from serialized record.
     * @param tag Used by tagged serialization formats (such as XML)
     * @return value read from serialized record.
     */
    boolean readBool(String tag) throws IOException;

    /**
     * Read an integer from serialized record.
     * @param tag Used by tagged serialization formats (such as XML)
     * @return value read from serialized record.
     */
    int readInt(String tag) throws IOException;

    /**
     * Read a long integer from serialized record.
     * @param tag Used by tagged serialization formats (such as XML)
     * @return value read from serialized record.
     */
    long readLong(String tag) throws IOException;

    /**
     * Read a single-precision float from serialized record.
     * @param tag Used by tagged serialization formats (such as XML)
     * @return value read from serialized record.
     */
    float readFloat(String tag) throws IOException;

    /**
     * Read a double-precision number from serialized record.
     * @param tag Used by tagged serialization formats (such as XML)
     * @return value read from serialized record.
     */
    double readDouble(String tag) throws IOException;

    /**
     * Read a UTF-8 encoded string from serialized record.
     * @param tag Used by tagged serialization formats (such as XML)
     * @return value read from serialized record.
     */
    String readString(String tag) throws IOException;

    /**
     * Read byte array from serialized record.
     * @param tag Used by tagged serialization formats (such as XML)
     * @return value read from serialized record.
     */
    Buffer readBuffer(String tag) throws IOException;

    /**
     * Check the mark for start of the serialized record.
     * @param tag Used by tagged serialization formats (such as XML)
     */
    void startRecord(String tag) throws IOException;

    /**
     * Check the mark for end of the serialized record.
     * @param tag Used by tagged serialization formats (such as XML)
     */
    void endRecord(String tag) throws IOException;

    /**
     * Check the mark for start of the serialized vector.
     * @param tag Used by tagged serialization formats (such as XML)
     * @return Index that is used to count the number of elements.
     */
    Index startVector(String tag) throws IOException;

    /**
     * Check the mark for end of the serialized vector.
     * @param tag Used by tagged serialization formats (such as XML)
     */
    void endVector(String tag) throws IOException;

    /**
     * Check the mark for start of the serialized map.
     * @param tag Used by tagged serialization formats (such as XML)
     * @return Index that is used to count the number of map entries.
     */
    Index startMap(String tag) throws IOException;

    /**
     * Check the mark for end of the serialized map.
     * @param tag Used by tagged serialization formats (such as XML)
     */
    void endMap(String tag) throws IOException;
}