/*
* Encog(tm) Core v3.3 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2014 Heaton Research, Inc.
*
* Licensed 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.
*
* For more information on Heaton Research copyrights, licenses
* and trademarks visit:
* http://www.heatonresearch.com/copyright
*/
package org.encog.ml.data.buffer;
import java.util.Iterator;
import org.encog.ml.data.MLDataError;
import org.encog.ml.data.MLDataPair;
import org.encog.ml.data.basic.BasicMLDataPair;
/**
* An iterator for the BufferedNeuralDataSet.
*/
public class BufferedDataSetIterator implements Iterator<MLDataPair> {
/**
* The dataset being iterated over.
*/
private final BufferedMLDataSet data;
/**
* The current record.
*/
private int current;
/**
* Construct the iterator.
*
* @param theData
* The dataset to iterate over.
*/
public BufferedDataSetIterator(final BufferedMLDataSet theData) {
this.data = theData;
this.current = 0;
}
/**
* @return True if there is are more records to read.
*/
@Override
public boolean hasNext() {
return this.current < this.data.getRecordCount();
}
/**
* {@inheritDoc}
*/
@Override
public MLDataPair next() {
// Make sure that only ONE iterator is using the underlying dataset at a time.
// This can be improved for better disk-based performance.
synchronized (this.data) {
if (!hasNext()) {
return null;
}
final MLDataPair pair = BasicMLDataPair.createPair(
this.data.getInputSize(), this.data.getIdealSize());
this.data.getRecord(this.current++, pair);
return pair;
}
}
/**
* Not supported.
*/
@Override
public void remove() {
throw new MLDataError("Remove is not supported.");
}
}