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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;

/**
 * This class is very similar to {@link FallbackConfigurationPropertySource}.
 * We could actually use {@link FallbackConfigurationPropertySource} wherever we use this class,
 * simply by inverting the constructor parameters, if it wasn't for one detail:
 * the implementation of {@link #resolve(String)} would not work as expected,
 * returning the key resolved using the wrong source.
 */
public class OverriddenConfigurationPropertySource implements ConfigurationPropertySource {
	private final ConfigurationPropertySource main;
	private final ConfigurationPropertySource override;

	public OverriddenConfigurationPropertySource(ConfigurationPropertySource main, ConfigurationPropertySource override) {
		this.main = main;
		this.override = override;
	}

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

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

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