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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.Traversal;
import org.apache.tinkerpop.gremlin.process.traversal.Traverser;
import org.apache.tinkerpop.gremlin.process.traversal.traverser.TraverserRequirement;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* @author Daniel Kuppitz (http://gremlin.guru)
*/
public final class DedupLocalStep<E, S extends Iterable<E>> extends ScalarMapStep<S, Set<E>> {
public DedupLocalStep(final Traversal.Admin traversal) {
super(traversal);
}
@Override
protected Set<E> map(final Traverser.Admin<S> traverser) {
final Set<E> result = new LinkedHashSet<>();
for (final E item : traverser.get()) {
result.add(item);
}
return result;
}
@Override
public Set<TraverserRequirement> getRequirements() {
return Collections.singleton(TraverserRequirement.OBJECT);
}
}