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/*
* 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.tinkerpop.gremlin.process.traversal.step.map;
import org.apache.tinkerpop.gremlin.process.traversal.Step;
import org.apache.tinkerpop.gremlin.process.traversal.Traversal;
import org.apache.tinkerpop.gremlin.process.traversal.Traverser;
import org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep;
import java.util.NoSuchElementException;
/**
* @author Marko A. Rodriguez (http://markorodriguez.com)
*/
public final class HasNextStep<S> extends AbstractStep<S, Boolean> {
public HasNextStep(final Traversal.Admin traversal) {
super(traversal);
}
@Override
protected Traverser<Boolean> processNextStart() throws NoSuchElementException {
if (this.starts.hasNext()) {
final Traverser.Admin<S> s = this.starts.next();
return s.split(Boolean.TRUE, this);
} else
return this.traversal.asAdmin().getTraverserGenerator().generate(Boolean.FALSE, (Step) this, 1l);
}
}