com.tngtech.configbuilder.annotation.valueextractor.PropertyValueProcessor Maven / Gradle / Ivy

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The Config Builder creates fully configured instances of config classes, using values from various sources like properties files, command line arguments etc.

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package com.tngtech.configbuilder.annotation.valueextractor;

import com.tngtech.configbuilder.configuration.BuilderConfiguration;
import com.tngtech.configbuilder.util.ConfigBuilderFactory;

import java.lang.annotation.Annotation;
import java.util.Properties;

/**
 * Processes PropertyValue annotations, implements ValueExtractorProcessor
 */
public class PropertyValueProcessor implements ValueExtractorProcessor {

    public String getValue(Annotation annotation, ConfigBuilderFactory configBuilderFactory) {
        BuilderConfiguration builderConfiguration = configBuilderFactory.getInstance(BuilderConfiguration.class);

        final Properties properties = builderConfiguration.getProperties();
        final String propertyName = ((PropertyValue) annotation).value();

        for (final String propertyNamePrefix : builderConfiguration.getPropertyNamePrefixes()) {
            final String fullPropertyName = propertyNamePrefix + propertyName;
            if (properties.containsKey(fullPropertyName)) {
                return properties.getProperty(fullPropertyName);
            }
        }
        return null;
    }
}