io.pipelite.expression.support.conversion.impl.ConverterRegistry Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of pipelite-expression Show documentation
Pipelite, a lightweight Java EAI framework
The newest version!
/*
 * Copyright (C) 2023-2024 the original author or authors.
 *
 * 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
 *
 *      https://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 io.pipelite.expression.support.conversion.impl;

import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;

/**
 * This class represents the main repository for registered {@link Converters} and {@link ConverterFactory} able to do
 * the conversion process.
 * 
 * This class is thread-safe.
 * 
 * @author
 *
 */
public class ConverterRegistry {

    private final Map converters;

    private final Map converterFactories;

    public ConverterRegistry() {
        converters = new ConcurrentHashMap();
        converterFactories = new ConcurrentHashMap();
    }

    /**
     * @param sourceType
     * @param targetType
     * @param converter
     */
    public void registerConverter(Class sourceType, Class targetType, Converter converter) {
        ConvertiblePair key = new ConvertiblePair(sourceType, targetType);
        if (!converters.containsKey(key)) {
            converters.put(key, new ConverterAdapter(converter, sourceType, targetType));
        }
    }

    /**
     * @param sourceType
     * @param targetType
     * @param converter
     */
    public void registerConverterFactory(Class sourceType, Class targetType,
            ConverterFactory converterFactory) {
        ConvertiblePair key = new ConvertiblePair(sourceType, targetType);
        if (!converterFactories.containsKey(key)) {
            converterFactories.put(key, new ConverterFactoryAdapter(converterFactory, sourceType, targetType));
        }
    }

    /**
     * @param key
     * @return
     */
    public Optional tryResolveConverter(ConvertiblePair key) {
        synchronized (this) {
            if (converters.containsKey(key)) {
                return Optional.ofNullable(converters.get(key));
            }
            else {
                for (ConverterAdapter converterAdapter : converters.values()) {
                    if (converterAdapter.supports(key.getSourceType(), key.getTargetType())) {
                        return Optional.of(converterAdapter);
                    }
                }
                for (ConverterFactoryAdapter converterFactoryAdapter : converterFactories.values()) {
                    if (converterFactoryAdapter.supports(key.getSourceType(), key.getTargetType())) {
                        ConverterFactory converterFactory = converterFactoryAdapter
                                .getConverterFactory();
                        Converter converter = converterFactory.getConverter(key.getTargetType());
                        ConverterAdapter converterAdapter = new ConverterAdapter(converter, key.getSourceType(),
                                key.getTargetType());
                        converters.put(key, converterAdapter);
                        return Optional.of(converterAdapter);
                    }
                }
                return Optional.empty();
            }
        }
    }

}