org.springframework.data.cassandra.repository.query.DefaultSpELExpressionEvaluator Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of spring-data-cassandra Show documentation
Show all versions of spring-data-cassandra Show documentation
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.query;
import org.springframework.data.mapping.model.SpELExpressionEvaluator;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.ExpressionParser;
/**
* Simple {@link SpELExpressionEvaluator} implementation using {@link ExpressionParser} and {@link EvaluationContext}.
*
* @author Mark Paluch
* @since 3.1
*/
class DefaultSpELExpressionEvaluator implements SpELExpressionEvaluator {
private final ExpressionParser parser;
private final EvaluationContext context;
DefaultSpELExpressionEvaluator(ExpressionParser parser, EvaluationContext context) {
this.parser = parser;
this.context = context;
}
/**
* Return a {@link SpELExpressionEvaluator} that does not support expression evaluation.
*
* @return a {@link SpELExpressionEvaluator} that does not support expression evaluation.
*/
public static SpELExpressionEvaluator unsupported() {
return NoOpExpressionEvaluator.INSTANCE;
}
/*
* (non-Javadoc)
* @see org.springframework.data.mapping.model.SpELExpressionEvaluator#evaluate(java.lang.String)
*/
@Override
@SuppressWarnings("unchecked")
public T evaluate(String expression) {
return (T) parser.parseExpression(expression).getValue(context, Object.class);
}
/**
* {@link SpELExpressionEvaluator} that does not support SpEL evaluation.
*
* @author Mark Paluch
*/
enum NoOpExpressionEvaluator implements SpELExpressionEvaluator {
INSTANCE;
@Override
public T evaluate(String expression) {
throw new UnsupportedOperationException("Expression evaluation not supported");
}
}
}