FactoryRegistryImpl.java

/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed 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.kie.workbench.common.stunner.core.registry.impl;

import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.kie.workbench.common.stunner.core.definition.adapter.AdapterManager;
import org.kie.workbench.common.stunner.core.definition.adapter.binding.BindableAdapterUtils;
import org.kie.workbench.common.stunner.core.diagram.Metadata;
import org.kie.workbench.common.stunner.core.factory.Factory;
import org.kie.workbench.common.stunner.core.factory.definition.DefinitionFactory;
import org.kie.workbench.common.stunner.core.factory.diagram.DiagramFactory;
import org.kie.workbench.common.stunner.core.factory.graph.ElementFactory;
import org.kie.workbench.common.stunner.core.registry.factory.TypeFactoryRegistry;

class FactoryRegistryImpl<T extends Factory<?>> implements TypeFactoryRegistry<T> {

    private final AdapterManager adapterManager;
    private final List<DefinitionFactory<?>> definitionFactories = new LinkedList<>();
    private final Map<Class<? extends ElementFactory>, ElementFactory<?, ?, ?>> graphFactories =
            new HashMap<>();
    private final List<DiagramFactory<?, ?>> diagramFactories
            = new LinkedList<>();

    FactoryRegistryImpl(final AdapterManager adapterManager) {
        this.adapterManager = adapterManager;
    }

    @Override
    public DefinitionFactory<?> getDefinitionFactory(final String id) {
        for (final DefinitionFactory<?> factory : definitionFactories) {
            if (factory.accepts(id)) {
                return factory;
            }
        }
        return null;
    }

    @Override
    public ElementFactory<?, ?, ?> getElementFactory(final Class<? extends ElementFactory> type) {
        return graphFactories.get(type);
    }

    @Override
    @SuppressWarnings("unchecked")
    public DiagramFactory<?, ?> getDiagramFactory(final String defSetId,
                                                  final Class<? extends Metadata> metadataType) {
        return diagramFactories.stream()
                .filter(factory -> !factory.isDefault()
                        && factory.accepts(defSetId)
                        && metadataType.equals(factory.getMetadataType()))
                .findFirst()
                .orElseGet(() -> getDefaultDiagramFactory(defSetId,
                                                          metadataType));
    }

    private DiagramFactory<?, ?> getDefaultDiagramFactory(final String defSetId,
                                                          final Class<? extends Metadata> metadataType) {
        return diagramFactories.stream()
                .filter(factory -> factory.isDefault()
                        && factory.accepts(defSetId)
                        && metadataType.equals(factory.getMetadataType()))
                .findFirst()
                .orElse(null);
    }

    @Override
    @SuppressWarnings("unchecked")
    public void register(final T item) {
        if (item instanceof DefinitionFactory) {
            definitionFactories.add((DefinitionFactory<?>) item);
        } else if (item instanceof ElementFactory) {
            graphFactories.put(((ElementFactory) item).getFactoryType(),
                               (ElementFactory<?, ?, ?>) item);
        } else if (item instanceof DiagramFactory) {
            diagramFactories.add((DiagramFactory<?, ?>) item);
        }
    }

    @Override
    public boolean remove(final T item) {
        if (item instanceof DefinitionFactory) {
            return definitionFactories.remove(item);
        } else if (item instanceof ElementFactory) {
            return null != graphFactories.remove(((ElementFactory) item).getFactoryType());
        } else if (item instanceof DiagramFactory) {
            return diagramFactories.remove(item);
        }
        return false;
    }

    @Override
    public void clear() {
        definitionFactories.clear();
        graphFactories.clear();
        diagramFactories.clear();
    }

    @Override
    public boolean contains(final T item) {
        if (item instanceof DefinitionFactory) {
            return definitionFactories.contains(item);
        } else if (item instanceof ElementFactory) {
            return graphFactories.containsValue(item);
        } else if (item instanceof DiagramFactory) {
            return diagramFactories.contains(item);
        }
        return false;
    }

    @Override
    public boolean isEmpty() {
        return definitionFactories.isEmpty() && graphFactories.isEmpty();
    }

    @Override
    @SuppressWarnings("unchecked")
    public Collection<T> getAllFactories() {
        return new LinkedList<T>() {{
            addAll((Collection<? extends T>) definitionFactories);
            addAll((Collection<? extends T>) diagramFactories);
            addAll((Collection<? extends T>) graphFactories.values());
        }};
    }

    @Override
    public DefinitionFactory<?> getDefinitionFactory(final Class<?> type) {
        final String id = BindableAdapterUtils.getDefinitionId(type,
                                                               adapterManager.registry());
        return getDefinitionFactory(id);
    }
}