com.teradata.benchto.driver.utils.PropertiesUtils.java Source code

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Here is the source code for com.teradata.benchto.driver.utils.PropertiesUtils.java

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/*
 * 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 com.teradata.benchto.driver.utils;

import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.FatalBeanException;
import org.springframework.boot.bind.PropertiesConfigurationFactory;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.validation.BindException;

import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;
import java.util.Optional;

import static com.google.common.base.Strings.isNullOrEmpty;
import static java.util.Collections.emptyList;
import static java.util.stream.Collectors.toList;

public final class PropertiesUtils {
    public static <T> T resolveEnvironmentProperties(ConfigurableEnvironment environment, Class<T> clazz) {
        return resolveEnvironmentProperties(environment, clazz, "");
    }

    public static <T> T resolveEnvironmentProperties(ConfigurableEnvironment environment, Class<T> clazz,
            String prefix) {
        try {
            T properties = BeanUtils.instantiate(clazz);
            PropertiesConfigurationFactory<T> factory = new PropertiesConfigurationFactory<T>(properties);
            factory.setTargetName(prefix);
            factory.setPropertySources(environment.getPropertySources());
            factory.setConversionService(environment.getConversionService());
            factory.bindPropertiesToTarget();
            return properties;
        } catch (BindException ex) {
            throw new FatalBeanException("Could not bind " + clazz + " properties", ex);
        }
    }

    public static List<Path> extractPaths(String paths) {
        return splitProperty(paths).map(dirs -> dirs.stream().map(Paths::get).collect(toList()))
                .orElse(emptyList());
    }

    public static Optional<List<String>> splitProperty(String value) {
        if (isNullOrEmpty(value)) {
            return Optional.empty();
        }

        Iterable<String> values = Splitter.on(",").trimResults().split(value);
        return Optional.of(ImmutableList.copyOf(values));
    }

    private PropertiesUtils() {
    }
}