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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + 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. diff --git a/commons-business-spring-impl/pom.xml b/commons-business-spring-impl/pom.xml new file mode 100644 index 0000000..b3fbaf8 --- /dev/null +++ b/commons-business-spring-impl/pom.xml @@ -0,0 +1,42 @@ + + + 4.0.0 + + + com.appjars.saturn.backend + commons-backend + 1.2.0-SNAPSHOT + + + commons-business-spring-impl + Commons Backend - Business Implementation (Spring Data) + + + + com.appjars.saturn.backend + commons-business-impl + ${project.version} + + + com.appjars.saturn.backend + commons-data-impl + ${project.version} + + + org.projectlombok + lombok + provided + + + javax.persistence + javax.persistence-api + + + org.springframework.data + spring-data-jpa + 2.6.3 + + + + diff --git a/commons-business-spring-impl/src/main/java/com/appjars/saturn/service/ConstraintSpecification.java b/commons-business-spring-impl/src/main/java/com/appjars/saturn/service/ConstraintSpecification.java new file mode 100644 index 0000000..5d45dae --- /dev/null +++ b/commons-business-spring-impl/src/main/java/com/appjars/saturn/service/ConstraintSpecification.java @@ -0,0 +1,34 @@ +package com.appjars.saturn.service; + +import javax.persistence.criteria.CriteriaBuilder; +import javax.persistence.criteria.CriteriaQuery; +import javax.persistence.criteria.Root; +import org.springframework.data.jpa.domain.Specification; +import org.springframework.lang.NonNull; +import com.appjars.saturn.dao.jpa.ConstraintTransformerJpaImpl; +import com.appjars.saturn.model.Constraint; +import com.appjars.saturn.model.QuerySpec; +import lombok.AccessLevel; +import lombok.RequiredArgsConstructor; + +@SuppressWarnings("serial") +@RequiredArgsConstructor(access = AccessLevel.PRIVATE) +final class ConstraintSpecification implements Specification { + + @NonNull + private final Constraint constraint; + + private static Specification newInstance(Constraint constraint) { + return new ConstraintSpecification<>(constraint); + } + + @Override + public javax.persistence.criteria.Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder criteriaBuilder) { + return new ConstraintTransformerJpaImpl(criteriaBuilder, root).apply(constraint); + } + + static Specification buildSpecification(QuerySpec querySpec) { + return querySpec.getConstraints().stream().map(ConstraintSpecification::newInstance).reduce(Specification::and).orElse(null); + } + +} diff --git a/commons-business-spring-impl/src/main/java/com/appjars/saturn/service/JpaCrudService.java b/commons-business-spring-impl/src/main/java/com/appjars/saturn/service/JpaCrudService.java new file mode 100644 index 0000000..ff52f0b --- /dev/null +++ b/commons-business-spring-impl/src/main/java/com/appjars/saturn/service/JpaCrudService.java @@ -0,0 +1,149 @@ +package com.appjars.saturn.service; + +import java.util.Collections; +import java.util.List; +import java.util.Optional; +import java.util.function.Function; +import java.util.stream.Collectors; + +import org.springframework.data.domain.PageRequest; +import org.springframework.data.domain.Pageable; +import org.springframework.data.domain.Sort; +import org.springframework.data.jpa.domain.Specification; +import org.springframework.data.jpa.repository.JpaSpecificationExecutor; +import org.springframework.data.repository.CrudRepository; +import org.springframework.data.util.Streamable; + +import com.appjars.saturn.model.ErrorDescription; +import com.appjars.saturn.model.QuerySpec; +import com.appjars.saturn.service.CrudService; +import com.appjars.saturn.service.validation.CreationValidator; +import com.appjars.saturn.service.validation.DeletionValidator; +import com.appjars.saturn.service.validation.UpdateValidator; +import com.appjars.saturn.validation.CreationValidationException; +import com.appjars.saturn.validation.DeletionValidationException; +import com.appjars.saturn.validation.UpdateValidationException; +import com.appjars.saturn.validation.ValidationException; +import com.appjars.saturn.validation.ValidationSupport; +import com.appjars.saturn.validation.Validator; + +public abstract class JpaCrudService implements CrudService { + + protected abstract CrudRepository getCrudRepository(); + + protected abstract JpaSpecificationExecutor getExecutor(); + + protected Specification buildSpecification(QuerySpec spec) { + return ConstraintSpecification.buildSpecification(spec); + } + + protected abstract K getId(T entity); + + private Sort buildSort(QuerySpec filter) { + if (filter.getOrders()==null || filter.getOrders().isEmpty()) { + return Sort.unsorted(); + } else { + return Sort.by(filter.getOrders().entrySet().stream().map(e->{ + switch (e.getValue()) { + case ASC: + return Sort.Order.asc(e.getKey()); + case DESC: + return Sort.Order.desc(e.getKey()); + } + throw new AssertionError(); + }).collect(Collectors.toList())); + } + } + + private Pageable buildPageable(QuerySpec filter) { + if (filter.getMaxResult()==null) { + throw new IllegalArgumentException("QuerySpec is not pageable"); + } + + int firstResult = Optional.ofNullable(filter.getFirstResult()).orElse(0); + int firstPage = firstResult/filter.getMaxResult(); + if (firstResult%filter.getMaxResult() !=0) { + throw new IllegalArgumentException("QuerySpec is not pageable"); + } + + Sort sort = buildSort(filter); + return PageRequest.of(firstPage, filter.getMaxResult(), sort); + } + + @Override + public Optional findById(K id) { + return getCrudRepository().findById(id); + } + + @Override + public List findAll() { + return Streamable.of(getCrudRepository().findAll()).toList(); + } + + @Override + public List filter(QuerySpec filter) { + if (filter.getFirstResult()==null && filter.getMaxResult()==null) { + return getExecutor().findAll(buildSpecification(filter), buildSort(filter)); + } else if (filter.getMaxResult().equals(0)) { + return Collections.emptyList(); + } else { + return getExecutor().findAll(buildSpecification(filter), buildPageable(filter)).toList(); + } + } + + @Override + public long count(QuerySpec filter) { + return getExecutor().count(buildSpecification(filter)); + } + + private List> getValidators(@SuppressWarnings("rawtypes") Class validatorType) { + if (this instanceof ValidationSupport) { + @SuppressWarnings("unchecked") + List> validators = ((ValidationSupport)this).getValidators(validatorType); + return validators; + } else { + return Collections.emptyList(); + } + } + + private void validate(@SuppressWarnings("rawtypes") Class validatorType, T entity, Function,ValidationException> newException) { + List> validators = getValidators(validatorType); + if (!validators.isEmpty()) { + List errors = validators.stream().flatMap(val->val.validate(entity).stream()).collect(Collectors.toList()); + if (!errors.isEmpty()) { + throw newException.apply(errors); + } + } + } + + @Override + public K save(T entity) { + validate(CreationValidator.class, entity, CreationValidationException::new); + return getId(getCrudRepository().save(entity)); + } + + @Override + public void update(T entity) { + validate(UpdateValidator.class, entity, UpdateValidationException::new); + getCrudRepository().save(entity); + } + + @Override + public void delete(T entity) { + validate(DeletionValidator.class, entity, DeletionValidationException::new); + getCrudRepository().delete(entity); + } + + @Override + public void deleteById(K id) { + if (getValidators(DeletionValidator.class).isEmpty()) { + getCrudRepository().deleteById(id); + } else { + findById(id).ifPresent(entity->{ + validate(DeletionValidator.class, entity, DeletionValidationException::new); + getCrudRepository().delete(entity); + }); + } + } + +} diff --git a/commons-data-impl/src/main/java/com/appjars/saturn/dao/jpa/ConstraintTransformerJpaImpl.java b/commons-data-impl/src/main/java/com/appjars/saturn/dao/jpa/ConstraintTransformerJpaImpl.java index acacf84..b2af05b 100644 --- a/commons-data-impl/src/main/java/com/appjars/saturn/dao/jpa/ConstraintTransformerJpaImpl.java +++ b/commons-data-impl/src/main/java/com/appjars/saturn/dao/jpa/ConstraintTransformerJpaImpl.java @@ -41,11 +41,17 @@ import com.appjars.saturn.model.constraints.AttributeRelationalConstraint; import com.appjars.saturn.model.constraints.NegatedConstraint; import com.appjars.saturn.model.constraints.RelationalConstraint; +import lombok.NonNull; +import lombok.RequiredArgsConstructor; +@RequiredArgsConstructor public class ConstraintTransformerJpaImpl extends ConstraintTransformer { + @NonNull private final CriteriaBuilder criteriaBuilder; - private From root; + + @NonNull + private final From root; public ConstraintTransformerJpaImpl(EntityManager em, From root) { this.criteriaBuilder = em.getCriteriaBuilder(); diff --git a/commons-model/src/main/java/com/appjars/saturn/model/Constraint.java b/commons-model/src/main/java/com/appjars/saturn/model/Constraint.java index 83afb0c..3b78706 100644 --- a/commons-model/src/main/java/com/appjars/saturn/model/Constraint.java +++ b/commons-model/src/main/java/com/appjars/saturn/model/Constraint.java @@ -19,6 +19,12 @@ */ package com.appjars.saturn.model; +import com.appjars.saturn.model.constraints.NegatedConstraint; + public interface Constraint { + default Constraint not() { + return new NegatedConstraint(this); + } + } diff --git a/commons-model/src/main/java/com/appjars/saturn/model/ConstraintBuilder.java b/commons-model/src/main/java/com/appjars/saturn/model/ConstraintBuilder.java index 2d94000..e8c7ffc 100644 --- a/commons-model/src/main/java/com/appjars/saturn/model/ConstraintBuilder.java +++ b/commons-model/src/main/java/com/appjars/saturn/model/ConstraintBuilder.java @@ -20,7 +20,8 @@ package com.appjars.saturn.model; import java.util.Collection; - +import java.util.stream.Collectors; +import java.util.stream.Stream; import com.appjars.saturn.model.constraints.AttributeBetweenConstraint; import com.appjars.saturn.model.constraints.AttributeILikeConstraint; import com.appjars.saturn.model.constraints.AttributeInConstraint; @@ -29,41 +30,116 @@ import com.appjars.saturn.model.constraints.AttributeRelationalConstraint; import com.appjars.saturn.model.constraints.NegatedConstraint; import com.appjars.saturn.model.constraints.RelationalConstraint; +import lombok.AccessLevel; +import lombok.NonNull; +import lombok.RequiredArgsConstructor; -import lombok.experimental.UtilityClass; - -@UtilityClass +@RequiredArgsConstructor(access = AccessLevel.PROTECTED) public class ConstraintBuilder { - public Constraint not(Constraint c) { - return new NegatedConstraint(c); - } - - public Constraint equal(String attribute, Object value) { - return new AttributeRelationalConstraint(attribute, value, RelationalConstraint.EQ); - } - - public Constraint notEqual(String attribute, Object value) { - return new AttributeRelationalConstraint(attribute, value, RelationalConstraint.NE); - } - - public > Constraint between(String attribute, T lower, T upper) { - return new AttributeBetweenConstraint(attribute, lower, upper); - } - - public Constraint like(String attribute, String pattern) { - return new AttributeLikeConstraint(attribute, pattern); - } - - public Constraint in(String attribute, Collection values) { - return new AttributeInConstraint(attribute, values); - } - - public Constraint isNull(String attribute) { - return new AttributeNullConstraint(attribute); - } - - public Constraint iLike(String attribute, String pattern) { - return new AttributeILikeConstraint(attribute, pattern); - } + public static ConstraintBuilder of(String attribute0, String... attributes) { + String attribute = Stream.concat(Stream.of(attribute0), Stream.of(attributes)).collect(Collectors.joining(".")); + return new ConstraintBuilder(attribute); + } + + @NonNull + private final String attribute; + + /** + * @deprecated Use {@link Constraint#not()} + */ + @Deprecated + public static Constraint not(Constraint c) { + return new NegatedConstraint(c); + } + + /** @deprecated Use {@link #equal(String)} */ + @Deprecated + public static Constraint equal(String attribute, Object value) { + return new AttributeRelationalConstraint(attribute, value, RelationalConstraint.EQ); + } + + /** @deprecated Use {@link #notEqual(String)} */ + @Deprecated + public static Constraint notEqual(String attribute, Object value) { + return new AttributeRelationalConstraint(attribute, value, RelationalConstraint.NE); + } + + /** @deprecated Use {@link #between(String)} */ + @Deprecated + public > Constraint between(String attribute, T lower, T upper) { + return new AttributeBetweenConstraint(attribute, lower, upper); + } + + /** @deprecated Use {@link #like(String)} */ + @Deprecated + public static Constraint like(String attribute, String pattern) { + return new AttributeLikeConstraint(attribute, pattern); + } + + /** @deprecated Use {@link #in(String)} */ + @Deprecated + public static Constraint in(String attribute, Collection values) { + return new AttributeInConstraint(attribute, values); + } + + /** @deprecated Use {@link #isNull(String)} */ + @Deprecated + public static Constraint isNull(String attribute) { + return new AttributeNullConstraint(attribute); + } + + /** @deprecated Use {@link #iLike(String)} */ + @Deprecated + public static Constraint iLike(String attribute, String pattern) { + return new AttributeILikeConstraint(attribute, pattern); + } + + public Constraint equal(Object value) { + return new AttributeRelationalConstraint(attribute, value, RelationalConstraint.EQ); + } + + public Constraint notEqual(Object value) { + return new AttributeRelationalConstraint(attribute, value, RelationalConstraint.NE); + } + + public Constraint lessThan(Object value) { + return new AttributeRelationalConstraint(attribute, value, RelationalConstraint.LT); + } + + public Constraint greaterThan(Object value) { + return new AttributeRelationalConstraint(attribute, value, RelationalConstraint.GT); + } + + public Constraint greaterOrEqualThan(Object value) { + return new AttributeRelationalConstraint(attribute, value, RelationalConstraint.GE); + } + + public Constraint lessOrEqualThan(Object value) { + return new AttributeRelationalConstraint(attribute, value, RelationalConstraint.LE); + } + + public > Constraint between(T lower, T upper) { + return new AttributeBetweenConstraint(attribute, lower, upper); + } + + public Constraint like(String pattern) { + return new AttributeLikeConstraint(attribute, pattern); + } + + public Constraint in(Collection values) { + return new AttributeInConstraint(attribute, values); + } + + public Constraint isNull() { + return new AttributeNullConstraint(attribute); + } + public Constraint isNotNull() { + return ConstraintBuilder.not(new AttributeNullConstraint(attribute)); + } + + public Constraint iLike(String pattern) { + return new AttributeILikeConstraint(attribute, pattern); + } + } diff --git a/commons-model/src/main/java/com/appjars/saturn/model/QuerySpec.java b/commons-model/src/main/java/com/appjars/saturn/model/QuerySpec.java index 93d5629..0f3325e 100644 --- a/commons-model/src/main/java/com/appjars/saturn/model/QuerySpec.java +++ b/commons-model/src/main/java/com/appjars/saturn/model/QuerySpec.java @@ -26,26 +26,29 @@ import java.util.Collection; import java.util.LinkedHashMap; import java.util.Map; - +import lombok.AccessLevel; import lombok.Getter; import lombok.Setter; -@Getter -@Setter public class QuerySpec { public enum Order { ASC, DESC; } + @Getter + @Setter private String[] returnedAttributes; + @Getter + @Setter private Map orders; private Integer firstResult; private Integer maxResult; + @Getter private final Collection constraints = new ArrayList<>(); public void addOrder(String property, Order order) { @@ -80,4 +83,42 @@ public String toString() { return buffer.toString(); } + /** + * Return the position of the first result to retrieve. + * @return the position of the first result to retrieve (numbered from 0) or null. + * @see {@link #setFirstResult(Integer)} + */ + public Integer getFirstResult() { + return firstResult; + } + + /** + * Return the maximum number of results to retrieve. + * @return the maximum number of results to retrieve, or null. + */ + public Integer getMaxResult() { + return maxResult; + } + + /** + * Set the position of the first result to retrieve. + * @param startPosition position of the first result, + * numbered from 0 (may be null) + * @return the same query instance + * @throws IllegalArgumentException if the argument is negative + */ + public void setFirstResult(Integer firstResult) { + if (firstResult!=null && firstResult<0) throw new IllegalArgumentException(); + this.firstResult = firstResult; + } + + /** + * Set the maximum number of results to retrieve. + * @param maxResult maximum number of results to retrieve (may be null) + * @throws IllegalArgumentException if the argument is negative + */ + public void setMaxResult(Integer maxResult) { + if (maxResult!=null && maxResult<0) throw new IllegalArgumentException(); + this.maxResult = maxResult; + } } diff --git a/pom.xml b/pom.xml index fa368df..dc9082f 100644 --- a/pom.xml +++ b/pom.xml @@ -78,6 +78,7 @@ commons-data-impl commons-business commons-business-impl + commons-business-spring-impl commons-model