spring-data-redis RangeConverter 源码

spring-data-redis RangeConverter 代码

文件路径：/src/main/java/org/springframework/data/redis/connection/lettuce/RangeConverter.java

/*
 * Copyright 2018-2022 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.connection.lettuce;

import io.lettuce.core.Range;
import io.lettuce.core.Range.Boundary;
import io.lettuce.core.codec.StringCodec;

import java.util.function.Function;

import org.springframework.data.domain.Range.Bound;
import org.springframework.lang.Nullable;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;

/**
 * @author Christoph Strobl
 * @author Mark Paluch
 */
class RangeConverter {

	static <T> Range<T> toRange(org.springframework.data.domain.Range<?> range) {
		return toRange(range, StringCodec.UTF8::encodeValue);
	}

	/**
	 * @param range the source {@link org.springframework.data.domain.Range} to convert.
	 * @param lowerDefault the lower default to use if {@link org.springframework.data.domain.Range#getLowerBound()} is
	 *          not {@link Bound#isBounded() bounded}.
	 * @param upperDefault the upper default to use if {@link org.springframework.data.domain.Range#getUpperBound()} is
	 *          not {@link Bound#isBounded() bounded}.
	 * @param <T>
	 * @return new instance of {@link Range}.
	 * @since 2.3
	 */
	static <T> Range<T> toRangeWithDefault(org.springframework.data.domain.Range<?> range, @Nullable T lowerDefault,
			@Nullable T upperDefault) {
		return toRangeWithDefault(range, lowerDefault, upperDefault, StringCodec.UTF8::encodeValue);
	}

	static <T> Range<T> toRange(org.springframework.data.domain.Range<?> range,
			Function<String, ? extends Object> stringEncoder) {
		return toRangeWithDefault(range, null, null, stringEncoder);
	}

	/**
	 * @param range the source {@link org.springframework.data.domain.Range} to convert.
	 * @param lowerDefault the lower default to use if {@link org.springframework.data.domain.Range#getLowerBound()} is
	 *          not {@link Bound#isBounded() bounded}.
	 * @param upperDefault the upper default to use if {@link org.springframework.data.domain.Range#getUpperBound()} is
	 *          not {@link Bound#isBounded() bounded}.
	 * @param stringEncoder the encoder to use.
	 * @param <T>
	 * @return new instance of {@link Range}.
	 * @since 2.3
	 */
	static <T> Range<T> toRangeWithDefault(org.springframework.data.domain.Range<?> range, @Nullable T lowerDefault,
			@Nullable T upperDefault, Function<String, ? extends Object> stringEncoder) {

		return Range.from(lowerBoundArgOf(range, lowerDefault, stringEncoder),
				upperBoundArgOf(range, upperDefault, stringEncoder));
	}

	@SuppressWarnings("unchecked")
	private static <T> Boundary<T> lowerBoundArgOf(org.springframework.data.domain.Range<?> range,
			@Nullable T lowerDefault, Function<String, ? extends Object> stringEncoder) {
		return (Boundary<T>) convertBound(range.getLowerBound(), false, lowerDefault, stringEncoder);
	}

	@SuppressWarnings("unchecked")
	private static <T> Boundary<T> upperBoundArgOf(org.springframework.data.domain.Range<?> range,
			@Nullable T upperDefault, Function<String, ? extends Object> stringEncoder) {
		return (Boundary<T>) convertBound(range.getUpperBound(), false, upperDefault, stringEncoder);
	}

	static Boundary<?> convertBound(org.springframework.data.domain.Range.Bound source, boolean convertNumberToBytes,
			Object defaultValue, Function<String, ? extends Object> stringEncoder) {

		if (!source.isBounded()) {
			return Boundary.unbounded();
		}

		Boolean inclusive = source.isInclusive();
		Object value = source.getValue().orElse(defaultValue);

		if (value instanceof Number) {

			if (convertNumberToBytes) {
				value = value.toString();
			} else {
				return inclusive ? Boundary.including((Number) value) : Boundary.excluding((Number) value);
			}
		}

		if (value instanceof String) {

			if (!StringUtils.hasText((String) value) || ObjectUtils.nullSafeEquals(value, "+")
					|| ObjectUtils.nullSafeEquals(value, "-")) {
				return Boundary.unbounded();
			}

			Object encoded = stringEncoder.apply((String) value);
			return inclusive ? Boundary.including(encoded) : Boundary.excluding(encoded);

		}

		if (value == null) {
			return Boundary.unbounded();
		}

		return inclusive ? Boundary.including(value) : Boundary.excluding(value);
	}
}

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