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Cassandra support for Spring Data
/*
* Copyright 2020-2022 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.cassandra.repository.support;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.springframework.expression.Expression;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.ParseException;
import org.springframework.expression.ParserContext;
/**
* Caching variant of {@link ExpressionParser}. This implementation does not support
* {@link #parseExpression(String, ParserContext) parsing with ParseContext}.
*
* @author Mark Paluch
* @since 3.1
*/
class CachingExpressionParser implements ExpressionParser {
private final ExpressionParser delegate;
private final Map cache = new ConcurrentHashMap<>();
CachingExpressionParser(ExpressionParser delegate) {
this.delegate = delegate;
}
@Override
public Expression parseExpression(String expressionString) throws ParseException {
return cache.computeIfAbsent(expressionString, delegate::parseExpression);
}
@Override
public Expression parseExpression(String expressionString, ParserContext context) throws ParseException {
throw new UnsupportedOperationException("Parsing using ParserContext is not supported");
}
}