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Add support for view property sorting with Spring Sort
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...data/base/src/main/java/com/blazebit/persistence/spring/data/base/EntityViewSortUtil.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,92 @@ | ||
| /* | ||
| * Copyright 2014 - 2019 Blazebit. | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package com.blazebit.persistence.spring.data.base; | ||
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| import com.blazebit.persistence.FullQueryBuilder; | ||
| import com.blazebit.persistence.view.EntityViewManager; | ||
| import com.blazebit.persistence.view.metamodel.ManagedViewType; | ||
| import com.blazebit.persistence.view.metamodel.MethodAttribute; | ||
| import com.blazebit.persistence.view.metamodel.PluralAttribute; | ||
| import com.blazebit.persistence.view.metamodel.SingularAttribute; | ||
| import com.blazebit.persistence.view.metamodel.Type; | ||
| import com.blazebit.persistence.view.metamodel.ViewType; | ||
| import org.springframework.data.domain.Sort; | ||
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|
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| /** | ||
| * Utility methods to handle entity view sorting. | ||
| * | ||
| * @author Moritz Becker | ||
| * @author Giovanni Lovato | ||
| * @since 1.4.0 | ||
| */ | ||
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| public final class EntityViewSortUtil { | ||
|
|
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| private EntityViewSortUtil() { | ||
| } | ||
|
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| /** | ||
| * Resolves the deterministic select item alias for an entity view attribute. | ||
| * | ||
| * @param evm entity view manager | ||
| * @param entityViewClass entity view class | ||
| * @param attributePath the absolute attribute path based on the {@code entityViewClass} for which the select alias should be resolved | ||
| * @return the select item alias for the (nested) entity view attribute targeted by {@code attributePath} or {@code null} | ||
| * if the {@code attributePath} cannot be resolved | ||
| */ | ||
| private static String resolveViewAttributeSelectAlias(EntityViewManager evm, Class<?> entityViewClass, String attributePath) { | ||
| ManagedViewType<?> viewType = evm.getMetamodel().view(entityViewClass); | ||
| StringBuilder aliasBuilder = new StringBuilder(((ViewType<?>) viewType).getName()); | ||
| for (String pathElement : attributePath.split("\\.")) { | ||
| if (viewType == null) { | ||
| return null; | ||
| } else { | ||
| MethodAttribute<?, ?> attribute = viewType.getAttribute(pathElement); | ||
| if (attribute == null) { | ||
| return null; | ||
| } else { | ||
| aliasBuilder.append('_').append(pathElement); | ||
| Type<?> type; | ||
| if (attribute instanceof SingularAttribute) { | ||
| type = ((SingularAttribute<?, ?>) attribute).getType(); | ||
| } else { | ||
| type = ((PluralAttribute<?, ?, ?>) attribute).getElementType(); | ||
| } | ||
| if (type instanceof ManagedViewType) { | ||
| // It's a view type, continue descending | ||
| viewType = (ManagedViewType<?>) type; | ||
| } else { | ||
| // It's a basic type, so we cannot got further | ||
| viewType = null; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return aliasBuilder.toString(); | ||
| } | ||
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| public static void applySort(EntityViewManager evm, Class<?> entityViewClass, FullQueryBuilder<?, ?> cb, Sort sort) { | ||
| for (Sort.Order order : sort) { | ||
| String entityViewAttributeAlias; | ||
| if ((entityViewAttributeAlias = EntityViewSortUtil.resolveViewAttributeSelectAlias(evm, entityViewClass, order.getProperty())) == null) { | ||
| cb.orderBy(order.getProperty(), order.isAscending(), order.getNullHandling() == Sort.NullHandling.NULLS_FIRST); | ||
| } else { | ||
| cb.orderBy(entityViewAttributeAlias, order.isAscending(), order.getNullHandling() == Sort.NullHandling.NULLS_FIRST); | ||
| } | ||
| } | ||
| } | ||
| } |
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