| /* |
| * 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; |
| |
| import org.javatuples.Pair; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.stream.Collectors; |
| |
| /** |
| * Base implementation of the {@link IoRegistry} interface that provides implementation of the methods using a |
| * a {@code HashMap}. Providers should extend from this class if they have custom serializers to provide to IO |
| * instances. Simply register their classes to it via the provided {@link #register(Class, Class, Object)} method. |
| * <p/> |
| * It is important that implementations provide a zero-arg constructor as there may be cases where it will need to be |
| * constructed via reflection. As such, calls to {@link #register(Class, Class, Object)} should likely occur |
| * directly in the constructor. |
| * |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| */ |
| public abstract class AbstractIoRegistry implements IoRegistry { |
| private final Map<Class<? extends Io>, List<Pair<Class, Object>>> registeredSerializers = new HashMap<>(); |
| |
| /** |
| * Add a "serializer" for the {@code Mapper}. Note that what is accepted as a "serializer" is implementation |
| * specific. An {@link Io} implementation will consult this registry for "serializer" classes |
| * it expects so refer to the {@link Io} implementation to understand what is expected for these values. |
| * |
| * @param clazz usually this is the class that is to be serialized - may be {@code null} |
| * @param serializer a serializer implementation |
| */ |
| protected void register(final Class<? extends Io> ioClass, final Class clazz, final Object serializer) { |
| if (!registeredSerializers.containsKey(ioClass)) |
| registeredSerializers.put(ioClass, new ArrayList<>()); |
| registeredSerializers.get(ioClass).add(Pair.with(clazz, serializer)); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public List<Pair<Class,Object>> find(final Class<? extends Io> builderClass) { |
| if (!registeredSerializers.containsKey(builderClass)) return Collections.emptyList(); |
| return Collections.unmodifiableList(registeredSerializers.get(builderClass).stream() |
| .collect(Collectors.toList())); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public <S> List<Pair<Class,S>> find(final Class<? extends Io> builderClass, final Class<S> serializerType) { |
| if (!registeredSerializers.containsKey(builderClass)) return Collections.emptyList(); |
| return Collections.unmodifiableList(registeredSerializers.get(builderClass).stream() |
| .filter(p -> serializerType.isAssignableFrom(p.getValue1().getClass())) |
| .map(p -> Pair.with(p.getValue0(), (S) p.getValue1())) |
| .collect(Collectors.toList())); |
| } |
| } |