Record.java
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上传日期:2018-01-08
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文件大小:3k
- /**
- * 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.DataInput;
- import java.io.DataOutput;
- import java.io.ByteArrayOutputStream;
- import java.io.IOException;
- import org.apache.hadoop.io.WritableComparable;
- /**
- * Abstract class that is extended by generated classes.
- *
- */
- public abstract class Record implements WritableComparable, Cloneable {
-
- /**
- * Serialize a record with tag (ususally field name)
- * @param rout Record output destination
- * @param tag record tag (Used only in tagged serialization e.g. XML)
- */
- public abstract void serialize(RecordOutput rout, String tag)
- throws IOException;
-
- /**
- * Deserialize a record with a tag (usually field name)
- * @param rin Record input source
- * @param tag Record tag (Used only in tagged serialization e.g. XML)
- */
- public abstract void deserialize(RecordInput rin, String tag)
- throws IOException;
-
- // inheric javadoc
- public abstract int compareTo (final Object peer) throws ClassCastException;
-
- /**
- * Serialize a record without a tag
- * @param rout Record output destination
- */
- public void serialize(RecordOutput rout) throws IOException {
- this.serialize(rout, "");
- }
-
- /**
- * Deserialize a record without a tag
- * @param rin Record input source
- */
- public void deserialize(RecordInput rin) throws IOException {
- this.deserialize(rin, "");
- }
-
- // inherit javadoc
- public void write(final DataOutput out) throws java.io.IOException {
- BinaryRecordOutput bout = BinaryRecordOutput.get(out);
- this.serialize(bout);
- }
-
- // inherit javadoc
- public void readFields(final DataInput din) throws java.io.IOException {
- BinaryRecordInput rin = BinaryRecordInput.get(din);
- this.deserialize(rin);
- }
- // inherit javadoc
- public String toString() {
- try {
- ByteArrayOutputStream s = new ByteArrayOutputStream();
- CsvRecordOutput a = new CsvRecordOutput(s);
- this.serialize(a);
- return new String(s.toByteArray(), "UTF-8");
- } catch (Throwable ex) {
- throw new RuntimeException(ex);
- }
- }
- }