/*
 * Copyright 2016-2024 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.data.redis.core.index;

import org.springframework.data.redis.core.convert.SpelIndexResolver;
import org.springframework.expression.spel.standard.SpelExpression;
import org.springframework.lang.Nullable;
import org.springframework.util.ObjectUtils;

/**
 * {@link SpelIndexDefinition} defines index that is evaluated based on a {@link SpelExpression} requires the
 * {@link SpelIndexResolver} to be evaluated.
 *
 * @author Christoph Strobl
 * @since 1.7
 */
public class SpelIndexDefinition extends RedisIndexDefinition {

	private final String expression;

	/**
	 * Creates new {@link SpelIndexDefinition}.
	 *
	 * @param keyspace must not be {@literal null}.
	 * @param expression must not be {@literal null}.
	 * @param indexName must not be {@literal null}.
	 */
	public SpelIndexDefinition(String keyspace, String expression, String indexName) {

		super(keyspace, null, indexName);

		this.expression = expression;
	}

	/**
	 * Get the raw expression.
	 *
	 * @return
	 */
	public String getExpression() {
		return expression;
	}

	@Override
	public boolean equals(@Nullable Object o) {
		if (this == o)
			return true;
		if (o == null || getClass() != o.getClass())
			return false;
		if (!super.equals(o))
			return false;

		SpelIndexDefinition that = (SpelIndexDefinition) o;

		return ObjectUtils.nullSafeEquals(expression, that.expression);
	}

	@Override
	public int hashCode() {
		int result = super.hashCode();
		result = 31 * result + ObjectUtils.nullSafeHashCode(expression);
		return result;
	}
}
