org.deeplearning4j.models.sequencevectors.iterators.AbstractSequenceIterator Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* 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.
*
* 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.deeplearning4j.models.sequencevectors.iterators;
import lombok.NonNull;
import org.deeplearning4j.models.sequencevectors.interfaces.SequenceIterator;
import org.deeplearning4j.models.sequencevectors.sequence.Sequence;
import org.deeplearning4j.models.sequencevectors.sequence.SequenceElement;
import java.util.Iterator;
import java.util.concurrent.atomic.AtomicInteger;
/**
* This is basic generic SequenceIterator implementation
*
* @author [email protected]
*/
public class AbstractSequenceIterator implements SequenceIterator {
private Iterable> underlyingIterable;
private Iterator> currentIterator;
// used to tag each sequence with own Id
protected AtomicInteger tagger = new AtomicInteger(0);
protected AbstractSequenceIterator(@NonNull Iterable> iterable) {
this.underlyingIterable = iterable;
this.currentIterator = iterable.iterator();
}
/**
* Checks, if there's more sequences available
* @return
*/
@Override
public boolean hasMoreSequences() {
return currentIterator.hasNext();
}
/**
* Returns next sequence out of iterator
* @return
*/
@Override
public Sequence nextSequence() {
Sequence sequence = currentIterator.next();
sequence.setSequenceId(tagger.getAndIncrement());
return sequence;
}
/**
* Resets iterator to first position
*/
@Override
public void reset() {
tagger.set(0);
this.currentIterator = underlyingIterable.iterator();
}
public static class Builder {
private Iterable> underlyingIterable;
/**
* Builds AbstractSequenceIterator on top of Iterable object
* @param iterable
*/
public Builder(@NonNull Iterable> iterable) {
this.underlyingIterable = iterable;
}
/**
* Builds SequenceIterator
* @return
*/
public AbstractSequenceIterator build() {
AbstractSequenceIterator iterator = new AbstractSequenceIterator<>(underlyingIterable);
return iterator;
}
}
}