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/*
* ******************************************************************************
* *
* *
* * This program and the accompanying materials are made available under the
* * terms of the Apache License, Version 2.0 which is available at
* * https://www.apache.org/licenses/LICENSE-2.0.
* *
* * See the NOTICE file distributed with this work for additional
* * information regarding copyright ownership.
* * 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.
* *
* * SPDX-License-Identifier: Apache-2.0
* *****************************************************************************
*/
package org.nd4j.linalg.dataset.adapter;
import lombok.Getter;
import lombok.Setter;
import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.dataset.api.DataSetPreProcessor;
import org.nd4j.linalg.dataset.api.iterator.DataSetIterator;
import java.util.List;
import java.util.NoSuchElementException;
public class SingletonDataSetIterator implements DataSetIterator {
private final DataSet dataSet;
private boolean hasNext = true;
private boolean preprocessed = false;
@Getter @Setter
private DataSetPreProcessor preProcessor;
/**
* @param multiDataSet The underlying dataset to return
*/
public SingletonDataSetIterator(DataSet multiDataSet) {
this.dataSet = multiDataSet;
}
@Override
public DataSet next(int num) {
return next();
}
@Override
public int inputColumns() {
return 0;
}
@Override
public int totalOutcomes() {
return 0;
}
@Override
public boolean resetSupported() {
return true;
}
@Override
public boolean asyncSupported() {
return false;
}
@Override
public void reset() {
hasNext = true;
}
@Override
public int batch() {
return 0;
}
@Override
public List getLabels() {
return null;
}
@Override
public boolean hasNext() {
return hasNext;
}
@Override
public DataSet next() {
if (!hasNext) {
throw new NoSuchElementException("No elements remaining");
}
hasNext = false;
if (preProcessor != null && !preprocessed) {
preProcessor.preProcess(dataSet);
preprocessed = true;
}
return dataSet;
}
@Override
public void remove() {
//No op
}
}