| /* |
| * 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.apache.ignite.springdata20.repository.query; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import org.jetbrains.annotations.Nullable; |
| import org.springframework.util.Assert; |
| |
| /** |
| * NULL-Object pattern implementation for {@link DeclaredQuery}. |
| * |
| * @author Jens Schauder |
| */ |
| 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(); |
| |
| /** {@inheritDoc} */ |
| @Override public boolean hasNamedParameter() { |
| return false; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public String getQueryString() { |
| return ""; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public String getAlias() { |
| return null; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public boolean hasConstructorExpression() { |
| return false; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public boolean isDefaultProjection() { |
| return false; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public List<StringQuery.ParameterBinding> getParameterBindings() { |
| return Collections.emptyList(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public DeclaredQuery deriveCountQuery(@Nullable String cntQry, @Nullable String cntQryProjection) { |
| Assert.hasText(cntQry, "CountQuery must not be empty!"); |
| return DeclaredQuery.of(cntQry); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public boolean usesJdbcStyleParameters() { |
| return false; |
| } |
| } |