/*
* Copyright 2014 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
*
* http://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.jpa.repository.query;
import javax.persistence.Query;
import org.springframework.data.jpa.repository.query.StringQuery.ParameterBinding;
import org.springframework.data.repository.query.EvaluationContextProvider;
import org.springframework.expression.Expression;
import org.springframework.util.Assert;
/**
* A {@link StringQueryParameterBinder} that is able to bind synthetic query parameters.
*
* @author Thomas Darimont
*/
class SpelExpressionStringQueryParameterBinder extends StringQueryParameterBinder {
private final StringQuery query;
/**
* Creates a new {@link SpelExpressionStringQueryParameterBinder}.
*
* @param parameters must not be {@literal null}
* @param values must not be {@literal null}
* @param query must not be {@literal null}
* @param evaluationContextProvider must not be {@literal null}
*/
public SpelExpressionStringQueryParameterBinder(JpaParameters parameters, Object[] values, StringQuery query,
EvaluationContextProvider evaluationContextProvider) {
super(parameters, values, query, evaluationContextProvider);
Assert.notNull(evaluationContextProvider, "EvaluationContextProvider must not be null!");
this.query = query;
}
/* (non-Javadoc)
* @see org.springframework.data.jpa.repository.query.ParameterBinder#bind(javax.persistence.Query)
*/
@Override
public <T extends Query> T bind(T jpaQuery) {
return potentiallyBindExpressionParameters(super.bind(jpaQuery));
}
/**
* @param jpaQuery must not be {@literal null}
* @return
*/
private <T extends Query> T potentiallyBindExpressionParameters(T jpaQuery) {
if (isJpaParameterInformationReliable(jpaQuery) && jpaQuery.getParameters().isEmpty()) {
// We can rely on the fact there are no parameters in the given query.
return jpaQuery;
}
for (ParameterBinding binding : query.getParameterBindings()) {
if (binding.isExpression()) {
Expression expr = parseExpressionString(binding.getExpression());
Object value = evaluateExpression(expr);
try {
if (binding.getName() != null) {
jpaQuery.setParameter(binding.getName(), binding.prepare(value));
} else {
jpaQuery.setParameter(binding.getPosition(), binding.prepare(value));
}
} catch (IllegalArgumentException iae) {
/*
* Since Eclipse doesn't reliably report whether a query has parameters
* we simply try to set the parameters and ignore possible failures.
*
*/
}
}
}
return jpaQuery;
}
private <T extends Query> boolean isJpaParameterInformationReliable(T jpaQuery) {
String className = jpaQuery.getClass().getName();
return className.startsWith("org.apache.openjpa") || className.startsWith("org.hibernate");
}
}