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Cassandra support for Spring Data
/*
* Copyright 2017-2022 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.util;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.ParserContext;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.lang.Nullable;
/**
* Evaluates a SpEL expression.
*
* @author Mark Paluch
*/
public class SpelUtils {
public static final SpelExpressionParser DEFAULT_PARSER = new SpelExpressionParser();
/**
* Evaluates the given value against the given context as a string.
*/
@Nullable
public static String evaluate(CharSequence value, EvaluationContext context) {
return evaluate(value, context, DEFAULT_PARSER);
}
/**
* Evaluates the given value against the given context as a string using the given parser.
*/
@Nullable
public static String evaluate(CharSequence value, EvaluationContext context, ExpressionParser parser) {
return evaluate(value, context, String.class, parser);
}
/**
* Evaluates the given value against the given context as an object of the given class.
*/
@Nullable
public static T evaluate(CharSequence value, EvaluationContext context, Class clazz) {
return evaluate(value, context, clazz, DEFAULT_PARSER);
}
/**
* Evaluates the given value against the given context as an object of the given class using the given parser.
*/
@Nullable
public static T evaluate(CharSequence value, EvaluationContext context, Class clazz, ExpressionParser parser) {
Expression expression = parser.parseExpression(value.toString(), ParserContext.TEMPLATE_EXPRESSION);
return expression.getValue(context, clazz);
}
}