/*
* 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.sysml.runtime.io;
import java.io.IOException;
import org.apache.sysml.parser.Expression.ValueType;
import org.apache.sysml.runtime.DMLRuntimeException;
import org.apache.sysml.runtime.matrix.data.FrameBlock;
/**
* Base class for all format-specific frame writers. Every writer is required to implement the basic
* write functionality but might provide additional custom functionality. Any non-default parameters
* (e.g., CSV read properties) should be passed into custom constructors. There is also a factory
* for creating format-specific writers.
*
*/
public abstract class FrameWriter
{
public abstract void writeFrameToHDFS( FrameBlock src, String fname, long rlen, long clen )
throws IOException, DMLRuntimeException;
public static FrameBlock[] createFrameBlocksForReuse( ValueType[] schema, String[] names, long rlen )
throws DMLRuntimeException
{
FrameBlock frameBlock[] = new FrameBlock[1];
frameBlock[0] = new FrameBlock(schema, names);
return frameBlock;
}
public static FrameBlock getFrameBlockForReuse( FrameBlock[] blocks) //TODO do we need this function?
{
return blocks[ 0 ];
}
}