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RawTable.java
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/
RawTable.java
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/*
* Licensed to the University of California, Berkeley 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 tachyon.master.rawtable.meta;
import java.nio.ByteBuffer;
import com.google.protobuf.ByteString;
import tachyon.master.journal.JournalEntryRepresentable;
import tachyon.proto.journal.Journal.JournalEntry;
import tachyon.proto.journal.RawTable.RawTableEntry;
import tachyon.util.io.BufferUtils;
public class RawTable implements JournalEntryRepresentable {
/** Table ID */
private final long mId;
/** Number of columns */
private final int mColumns;
/** Table metadata */
private ByteBuffer mMetadata;
/**
* Create a new RawTable with metadata set to null. metadata can later be set via
* {@link #setMetadata(java.nio.ByteBuffer)}.
*
* @param id table id
* @param columns number of columns
*/
public RawTable(long id, int columns) {
mId = id;
mColumns = columns;
mMetadata = null;
}
/**
* Create a new RawTable with metadata set to a ByteBuffer.
*
* @param id table id
* @param columns number of columns
* @param metadata table metadata, if is null, the internal metadata is set to an empty buffer,
* otherwise, the provided buffer will be copied into the internal buffer.
*/
public RawTable(long id, int columns, ByteBuffer metadata) {
mId = id;
mColumns = columns;
setMetadata(metadata);
}
public long getId() {
return mId;
}
public int getColumns() {
return mColumns;
}
public ByteBuffer getMetadata() {
return mMetadata;
}
/**
* Set the table metadata. If the specified metadata is null, the internal metadata will be set to
* an empty byte buffer, otherwise, the provided metadata will be copied into the internal buffer.
*
* @param metadata the metadata to be set
*/
public void setMetadata(ByteBuffer metadata) {
mMetadata = BufferUtils.cloneByteBuffer(metadata);
}
@Override
public JournalEntry toJournalEntry() {
RawTableEntry rawTable = RawTableEntry.newBuilder()
.setId(mId)
.setColumns(mColumns)
.setMetadata(ByteString.copyFrom(mMetadata))
.build();
return JournalEntry.newBuilder().setRawTable(rawTable).build();
}
}