| /* |
| * 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.server.util; |
| |
| import org.apache.tinkerpop.gremlin.driver.Tokens; |
| import org.apache.tinkerpop.gremlin.process.remote.traversal.DefaultRemoteTraverser; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.util.BulkSet; |
| import org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils; |
| |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| */ |
| public class SideEffectIterator implements Iterator<Object> { |
| |
| private final Iterator<Object> sideEffectIterator; |
| private final String sideEffectKey; |
| private final String sideEffectAggregator; |
| |
| public SideEffectIterator(final Object sideEffect, final String sideEffectKey) { |
| this.sideEffectKey = sideEffectKey; |
| sideEffectAggregator = getAggregatorType(sideEffect); |
| sideEffectIterator = sideEffect instanceof BulkSet ? |
| new BulkSetIterator((BulkSet) sideEffect) : |
| IteratorUtils.asIterator(sideEffect); |
| } |
| |
| public String getSideEffectKey() { |
| return sideEffectKey; |
| } |
| |
| public String getSideEffectAggregator() { |
| return sideEffectAggregator; |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return sideEffectIterator.hasNext(); |
| } |
| |
| @Override |
| public Object next() { |
| return sideEffectIterator.next(); |
| } |
| |
| private String getAggregatorType(final Object o) { |
| if (o instanceof BulkSet) |
| return Tokens.VAL_AGGREGATE_TO_BULKSET; |
| else if (o instanceof Set) |
| return Tokens.VAL_AGGREGATE_TO_SET; |
| else if (o instanceof Iterable || o instanceof Iterator) |
| return Tokens.VAL_AGGREGATE_TO_LIST; |
| else if (o instanceof Map) |
| return Tokens.VAL_AGGREGATE_TO_MAP; |
| else |
| return Tokens.VAL_AGGREGATE_TO_NONE; |
| } |
| |
| static class BulkSetIterator implements Iterator { |
| |
| private final Iterator<Map.Entry<Object,Long>> itty; |
| |
| public BulkSetIterator(final BulkSet<Object> bulkSet) { |
| itty = bulkSet.asBulk().entrySet().iterator(); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return itty.hasNext(); |
| } |
| |
| @Override |
| public Object next() { |
| final Map.Entry<Object, Long> entry = itty.next(); |
| return new DefaultRemoteTraverser<>(entry.getKey(), entry.getValue()); |
| } |
| } |
| } |