/*
* 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.branch;
import org.apache.tinkerpop.gremlin.process.traversal.Traversal;
import org.apache.tinkerpop.gremlin.process.traversal.step.map.HasNextStep;
/**
* A step which offers a choice of two or more Traversals to take.
*
* @author Joshua Shinavier (http://fortytwo.net)
* @author Marko A. Rodriguez (http://markorodriguez.com)
*/
public final class ChooseStep<S, E, M> extends BranchStep<S, E, M> {
public ChooseStep(final Traversal.Admin traversal, final Traversal.Admin<S, M> choiceTraversal) {
super(traversal);
this.setBranchTraversal(choiceTraversal);
}
public ChooseStep(final Traversal.Admin traversal, final Traversal.Admin<S, ?> predicateTraversal, final Traversal.Admin<S, E> trueChoice, final Traversal.Admin<S, E> falseChoice) {
this(traversal, (Traversal.Admin<S, M>) predicateTraversal.addStep(new HasNextStep<>(predicateTraversal)));
this.addGlobalChildOption((M) Boolean.TRUE, trueChoice);
this.addGlobalChildOption((M) Boolean.FALSE, falseChoice);
}
@Override
public void addGlobalChildOption(final M pickToken, final Traversal.Admin<S, E> traversalOption) {
if (Pick.any.equals(pickToken))
throw new IllegalArgumentException("Choose step can not have an any-option as only one option per traverser is allowed");
if (this.traversalOptions.containsKey(pickToken))
throw new IllegalArgumentException("Choose step can only have one traversal per pick token: " + pickToken);
super.addGlobalChildOption(pickToken, traversalOption);
}
}