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/*
 * SPDX-License-Identifier: Apache-2.0
 * Copyright Red Hat Inc. and Hibernate Authors
 */
package org.hibernate.search.engine.cfg.impl;

import java.util.Optional;

import org.hibernate.search.engine.cfg.ConfigurationPropertySource;

public class FallbackConfigurationPropertySource implements ConfigurationPropertySource {
	private final ConfigurationPropertySource main;
	private final ConfigurationPropertySource fallback;

	public FallbackConfigurationPropertySource(ConfigurationPropertySource main, ConfigurationPropertySource fallback) {
		this.main = main;
		this.fallback = fallback;
	}

	@Override
	public Optional get(String key) {
		Optional value = main.get( key );
		if ( !value.isPresent() ) {
			return fallback.get( key );
		}
		else {
			return value;
		}
	}

	@Override
	public Optional resolve(String key) {
		if ( !main.get( key ).isPresent() && fallback.get( key ).isPresent() ) {
			return fallback.resolve( key );
		}
		else {
			return main.resolve( key );
		}
	}

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder( getClass().getSimpleName() )
				.append( "[" )
				.append( "main=" ).append( main )
				.append( ", fallback=" ).append( fallback )
				.append( "]" );
		return sb.toString();
	}
}