| /* |
| * 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.structure.io.graphson; |
| |
| import org.apache.tinkerpop.gremlin.structure.Graph; |
| import org.apache.tinkerpop.gremlin.structure.io.Io; |
| import org.apache.tinkerpop.gremlin.structure.io.IoRegistry; |
| import org.apache.tinkerpop.gremlin.structure.io.Mapper; |
| |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.Optional; |
| import java.util.function.Consumer; |
| |
| /** |
| * Constructs GraphSON IO implementations given a {@link Graph} and {@link IoRegistry}. Implementers of the {@link Graph} |
| * interfaces should see the {@link GraphSONMapper} for information on the expectations for the {@link IoRegistry}. |
| * |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| */ |
| public final class GraphSONIo implements Io<GraphSONReader.Builder, GraphSONWriter.Builder, GraphSONMapper.Builder> { |
| private final Graph graph; |
| private final Optional<Consumer<Mapper.Builder>> onMapper; |
| private final GraphSONVersion version; |
| |
| private GraphSONIo(final Builder builder) { |
| this.graph = builder.graph; |
| this.onMapper = Optional.ofNullable(builder.onMapper); |
| this.version = builder.version; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public GraphSONReader.Builder reader() { |
| return GraphSONReader.build().mapper(mapper().create()); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public GraphSONWriter.Builder writer() { |
| return GraphSONWriter.build().mapper(mapper().create()); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public GraphSONMapper.Builder mapper() { |
| final GraphSONMapper.Builder builder = GraphSONMapper.build().version(version); |
| onMapper.ifPresent(c -> c.accept(builder)); |
| return builder; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void writeGraph(final String file) throws IOException { |
| try (final OutputStream out = new FileOutputStream(file)) { |
| writer().create().writeGraph(out, graph); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void readGraph(final String file) throws IOException { |
| try (final InputStream in = new FileInputStream(file)) { |
| reader().create().readGraph(in, graph); |
| } |
| } |
| |
| /** |
| * Create a new builder using the default version of GraphSON - v3. |
| */ |
| public static Io.Builder<GraphSONIo> build() { |
| return build(GraphSONVersion.V3_0); |
| } |
| |
| /** |
| * Create a new builder using the specified version of GraphSON. |
| */ |
| public static Io.Builder<GraphSONIo> build(final GraphSONVersion version) { |
| return new Builder(version); |
| } |
| |
| public final static class Builder implements Io.Builder<GraphSONIo> { |
| |
| private Graph graph; |
| private Consumer<Mapper.Builder> onMapper = null; |
| private final GraphSONVersion version; |
| |
| Builder(final GraphSONVersion version) { |
| this.version = version; |
| } |
| |
| @Override |
| public Io.Builder<? extends Io> onMapper(final Consumer<Mapper.Builder> onMapper) { |
| this.onMapper = onMapper; |
| return this; |
| } |
| |
| @Override |
| public Io.Builder<GraphSONIo> graph(final Graph g) { |
| this.graph = g; |
| return this; |
| } |
| |
| @Override |
| public <V> boolean requiresVersion(final V version) { |
| return this.version == version; |
| } |
| |
| @Override |
| public GraphSONIo create() { |
| if (null == graph) throw new IllegalArgumentException("The graph argument was not specified"); |
| return new GraphSONIo(this); |
| } |
| } |
| } |