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Spring Data module for JPA repositories.
/*
* Copyright 2018-2019 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 java.util.Collections;
import java.util.List;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* NULL-Object pattern implementation for {@link DeclaredQuery}.
*
* @author Jens Schauder
* @since 2.0.3
*/
class EmptyDeclaredQuery implements DeclaredQuery {
/**
* An implementation implementing the NULL-Object pattern for situations where there is no query.
*/
static final DeclaredQuery EMPTY_QUERY = new EmptyDeclaredQuery();
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.query.DeclaredQuery#hasNamedParameter()
*/
@Override
public boolean hasNamedParameter() {
return false;
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.query.DeclaredQuery#getQueryString()
*/
@Override
public String getQueryString() {
return "";
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.query.DeclaredQuery#getAlias()
*/
@Override
public String getAlias() {
return null;
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.query.DeclaredQuery#hasConstructorExpression()
*/
@Override
public boolean hasConstructorExpression() {
return false;
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.query.DeclaredQuery#isDefaultProjection()
*/
@Override
public boolean isDefaultProjection() {
return false;
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.query.DeclaredQuery#getParameterBindings()
*/
@Override
public List getParameterBindings() {
return Collections.emptyList();
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.query.DeclaredQuery#deriveCountQuery(java.lang.String, java.lang.String)
*/
@Override
public DeclaredQuery deriveCountQuery(@Nullable String countQuery, @Nullable String countQueryProjection) {
Assert.hasText(countQuery, "CountQuery must not be empty!");
return DeclaredQuery.of(countQuery);
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.query.DeclaredQuery#usesJdbcStyleParameters()
*/
@Override
public boolean usesJdbcStyleParameters() {
return false;
}
}