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| 1 | +/* |
| 2 | + * Licensed to the Apache Software Foundation (ASF) under one |
| 3 | + * or more contributor license agreements. See the NOTICE file |
| 4 | + * distributed with this work for additional information |
| 5 | + * regarding copyright ownership. The ASF licenses this file |
| 6 | + * to you under the Apache License, Version 2.0 (the |
| 7 | + * "License"); you may not use this file except in compliance |
| 8 | + * with the License. You may obtain a copy of the License at |
| 9 | + * |
| 10 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | + * |
| 12 | + * Unless required by applicable law or agreed to in writing, |
| 13 | + * software distributed under the License is distributed on an |
| 14 | + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | + * KIND, either express or implied. See the License for the |
| 16 | + * specific language governing permissions and limitations |
| 17 | + * under the License. |
| 18 | + */ |
| 19 | +package org.apache.tinkerpop.gremlin.process.traversal.step.map; |
| 20 | + |
| 21 | +import org.apache.tinkerpop.gremlin.process.traversal.Traversal; |
| 22 | +import org.apache.tinkerpop.gremlin.process.traversal.Traverser; |
| 23 | +import org.apache.tinkerpop.gremlin.process.traversal.traverser.TraverserRequirement; |
| 24 | + |
| 25 | +import java.util.Collections; |
| 26 | +import java.util.Set; |
| 27 | + |
| 28 | +/** |
| 29 | + * Reference implementation for boolean parsing step. |
| 30 | + */ |
| 31 | +public final class AsBoolStep<S> extends ScalarMapStep<S, Boolean> { |
| 32 | + |
| 33 | + public AsBoolStep(final Traversal.Admin traversal) { |
| 34 | + super(traversal); |
| 35 | + } |
| 36 | + |
| 37 | + @Override |
| 38 | + protected Boolean map(final Traverser.Admin<S> traverser) { |
| 39 | + final Object object = traverser.get(); |
| 40 | + if (object == null) throw new IllegalArgumentException("Can't parse null as Boolean."); |
| 41 | + if (object instanceof Boolean) return (Boolean) object; |
| 42 | + if (object instanceof Number) { |
| 43 | + final double d = ((Number) object).doubleValue(); |
| 44 | + if (Double.isNaN(d)) return false; |
| 45 | + return d != 0d; |
| 46 | + } |
| 47 | + if (object instanceof String) { |
| 48 | + final String str = ((String) object).trim(); |
| 49 | + if (str.equalsIgnoreCase("true")) return true; |
| 50 | + if (str.equalsIgnoreCase("false")) return false; |
| 51 | + throw new IllegalArgumentException("Can't parse " + object + " as Boolean."); |
| 52 | + } |
| 53 | + throw new IllegalArgumentException("Can't parse " + object.getClass().getName() + " as Boolean."); |
| 54 | + } |
| 55 | + |
| 56 | + @Override |
| 57 | + public Set<TraverserRequirement> getRequirements() { |
| 58 | + return Collections.singleton(TraverserRequirement.OBJECT); |
| 59 | + } |
| 60 | + |
| 61 | +} |
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