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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;

import org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils;

import java.util.Collection;
import java.util.function.BiPredicate;

/**
 * {@link Contains} is a {@link BiPredicate} that evaluates whether the first object is contained within (or not
 * within) the second collection object. If the first object is a number, each element in the second collection
 * will be compared to the first object using {@link Compare}'s {@code eq} predicate. This will ensure, that numbers
 * are matched by their value only, ignoring the number type. For example:
 * 

*

 * gremlin Contains.within [gremlin, blueprints, furnace] == true
 * gremlin Contains.without [gremlin, rexster] == false
 * rexster Contains.without [gremlin, blueprints, furnace] == true
 * 123 Contains.within [1, 2, 3] == false
 * 100 Contains.within [1L, 10L, 100L] == true
 * 
* * * * @author Pierre De Wilde * @author Marko A. Rodriguez (http://markorodriguez.com) */ public enum Contains implements BiPredicate { /** * The first object is within the {@link Collection} provided in the second object. * * @since 3.0.0-incubating */ within { @Override public boolean test(final Object first, final Collection second) { return first instanceof Number ? IteratorUtils.anyMatch(second.iterator(), o -> Compare.eq.test(first, o)) : second.contains(first); } }, /** * The first object is not within the {@link Collection} provided in the second object. * * @since 3.0.0-incubating */ without { @Override public boolean test(final Object first, final Collection second) { return !within.test(first, second); } }; /** * {@inheritDoc} */ @Override public abstract boolean test(final Object first, final Collection second); /** * Produce the opposite representation of the current {@code Contains} enum. */ @Override public Contains negate() { return this.equals(within) ? without : within; } }




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