| /* |
| * 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.util; |
| |
| import org.apache.tinkerpop.gremlin.process.traversal.Operator; |
| import org.apache.tinkerpop.gremlin.process.traversal.TraversalSideEffects; |
| import org.apache.tinkerpop.gremlin.structure.util.StringFactory; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.Set; |
| import java.util.function.BinaryOperator; |
| import java.util.function.Supplier; |
| import java.util.function.UnaryOperator; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public class DefaultTraversalSideEffects implements TraversalSideEffects { |
| |
| protected Set<String> keys = new HashSet<>(); |
| protected Map<String, Object> objectMap = new HashMap<>(); |
| protected Map<String, Supplier> supplierMap = new HashMap<>(); |
| protected Map<String, BinaryOperator> reducerMap = new HashMap<>(); |
| protected UnaryOperator sackSplitOperator = null; |
| protected BinaryOperator sackMergeOperator = null; |
| protected Supplier sackInitialValue = null; |
| |
| public DefaultTraversalSideEffects() { |
| |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean exists(final String key) { |
| return this.keys.contains(key); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <V> V get(final String key) throws IllegalArgumentException { |
| final V value = (V) this.objectMap.get(key); |
| if (null != value) |
| return value; |
| else { |
| final V v = this.<V>getSupplier(key).get(); |
| this.objectMap.put(key, v); |
| return v; |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void set(final String key, final Object value) throws IllegalArgumentException { |
| SideEffectHelper.validateSideEffectValue(value); |
| if (!this.keys.contains(key)) |
| throw TraversalSideEffects.Exceptions.sideEffectKeyDoesNotExist(key); |
| this.objectMap.put(key, value); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void add(final String key, final Object value) throws IllegalArgumentException { |
| SideEffectHelper.validateSideEffectValue(value); |
| this.set(key, this.getReducer(key).apply(this.get(key), value)); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <V> void register(final String key, final Supplier<V> initialValue, final BinaryOperator<V> reducer) { |
| SideEffectHelper.validateSideEffectKey(key); |
| this.keys.add(key); |
| //this.objectMap.remove(key); |
| if (null != initialValue) |
| this.supplierMap.put(key, initialValue); |
| if (null != reducer) |
| this.reducerMap.put(key, reducer); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <V> void registerIfAbsent(final String key, final Supplier<V> initialValue, final BinaryOperator<V> reducer) { |
| SideEffectHelper.validateSideEffectKey(key); |
| this.keys.add(key); |
| //this.objectMap.remove(key); |
| if (null == this.supplierMap.get(key) && null != initialValue) { |
| this.supplierMap.put(key, initialValue); |
| } |
| if (null == this.reducerMap.get(key) && null != reducer) { |
| this.reducerMap.put(key, reducer); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <V> BinaryOperator<V> getReducer(final String key) throws IllegalArgumentException { |
| if (!this.keys.contains(key)) |
| throw TraversalSideEffects.Exceptions.sideEffectKeyDoesNotExist(key); |
| return this.reducerMap.getOrDefault(key, Operator.assign); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <V> Supplier<V> getSupplier(final String key) throws IllegalArgumentException { |
| final Supplier<V> supplier = this.supplierMap.get(key); |
| if (null == supplier) |
| throw TraversalSideEffects.Exceptions.sideEffectKeyDoesNotExist(key); |
| return supplier; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <S> void setSack(final Supplier<S> initialValue, final UnaryOperator<S> splitOperator, final BinaryOperator<S> mergeOperator) { |
| this.sackInitialValue = initialValue; |
| this.sackSplitOperator = splitOperator; |
| this.sackMergeOperator = mergeOperator; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <S> Supplier<S> getSackInitialValue() { |
| return this.sackInitialValue; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <S> UnaryOperator<S> getSackSplitter() { |
| return this.sackSplitOperator; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <S> BinaryOperator<S> getSackMerger() { |
| return this.sackMergeOperator; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void remove(final String key) { |
| this.objectMap.remove(key); |
| this.supplierMap.remove(key); |
| this.reducerMap.remove(key); |
| this.keys.remove(key); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Set<String> keys() { |
| return Collections.unmodifiableSet(this.keys); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void mergeInto(final TraversalSideEffects sideEffects) { |
| for (final String key : this.keys) { |
| sideEffects.registerIfAbsent(key, this.supplierMap.get(key), this.reducerMap.get(key)); |
| if (this.objectMap.containsKey(key)) |
| sideEffects.set(key, this.objectMap.get(key)); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public String toString() { |
| return StringFactory.traversalSideEffectsString(this); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| @SuppressWarnings("CloneDoesntDeclareCloneNotSupportedException") |
| public DefaultTraversalSideEffects clone() { |
| try { |
| final DefaultTraversalSideEffects sideEffects = (DefaultTraversalSideEffects) super.clone(); |
| sideEffects.keys = new HashSet<>(this.keys); |
| sideEffects.objectMap = new HashMap<>(this.objectMap); |
| sideEffects.supplierMap = new HashMap<>(this.supplierMap); |
| sideEffects.reducerMap = new HashMap<>(this.reducerMap); |
| return sideEffects; |
| } catch (final CloneNotSupportedException e) { |
| throw new IllegalStateException(e.getMessage(), e); |
| } |
| } |
| } |