code/core/src/main/java/org/apache/tamaya/core/internal/converters/ConvertQuery.java

/*
 * 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.tamaya.core.internal.converters;

import org.apache.tamaya.Configuration;
import org.apache.tamaya.TypeLiteral;
import org.apache.tamaya.spi.ConversionContext;
import org.apache.tamaya.spi.PropertyConverter;

import java.util.List;
import java.util.Objects;
import java.util.function.Function;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Query to convert a String createValue.
 * @param <T> the target type.
 */
final class ConvertQuery<T> implements Function<Configuration, T> {

    private static final Logger LOG = Logger.getLogger(ConvertQuery.class.getName());

    private String rawValue;
    private TypeLiteral<T> type;

    public ConvertQuery(String rawValue, TypeLiteral<T> type) {
        this.rawValue = Objects.requireNonNull(rawValue);
        this.type = Objects.requireNonNull(type);
    }

    @Override
    public T apply(Configuration config) {
        List<PropertyConverter<T>> converters = config.getContext().getPropertyConverters(type);
        ConversionContext context = new ConversionContext.Builder(type).setConfiguration(config)
                .setKey(ConvertQuery.class.getName()).build();
        for (PropertyConverter<?> conv : converters) {
            try {
                if (conv instanceof OptionalConverter) {
                    continue;
                }
                T result = (T) conv.convert(rawValue, context);
                if (result != null) {
                    return result;
                }
            } catch (Exception e) {
                LOG.log(Level.FINEST, e, () -> "Converter " + conv + " failed to convert to " + type);
            }
        }
        return null;
    }
}