javax.persistence.criteria.Join.getAttribute()方法的使用及代码示例

x33g5p2x  于2022-01-21 转载在 其他  
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本文整理了Java中javax.persistence.criteria.Join.getAttribute()方法的一些代码示例，展示了Join.getAttribute()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Join.getAttribute()方法的具体详情如下：
包路径：javax.persistence.criteria.Join
类名称：Join
方法名：getAttribute

Join.getAttribute介绍

[英]Return the metamodel attribute corresponding to the join.
[中]返回与联接对应的元模型属性。

代码示例

代码示例来源：origin: spring-projects/spring-data-jpa

/**
 * Returns an existing join for the given attribute if one already exists or creates a new one if not.
 *
 * @param from the {@link From} to get the current joins from.
 * @param attribute the {@link Attribute} to look for in the current joins.
 * @return will never be {@literal null}.
 */
private static Join<?, ?> getOrCreateJoin(From<?, ?> from, String attribute) {
  for (Join<?, ?> join : from.getJoins()) {
    boolean sameName = join.getAttribute().getName().equals(attribute);
    if (sameName && join.getJoinType().equals(JoinType.LEFT)) {
      return join;
    }
  }
  return from.join(attribute, JoinType.LEFT);
}

代码示例来源：origin: kiegroup/jbpm

private static ListJoin<PeopleAssignmentsImpl,OrganizationalEntityImpl> [] getPeopleAssignmentsJoins(
    Join<TaskImpl,PeopleAssignmentsImpl> peopleAssignJoin) {
  ListJoin<PeopleAssignmentsImpl,OrganizationalEntityImpl>  [] joins = new ListJoin[3];
  for( Join<PeopleAssignmentsImpl,?> join : peopleAssignJoin.getJoins() ) {
    String joinFieldName = join.getAttribute().getName();
    if( PeopleAssignmentsImpl_.businessAdministrators.getName().equals(joinFieldName) ) {
      joins[0] = (ListJoin<PeopleAssignmentsImpl,OrganizationalEntityImpl>) join;
    } else if( PeopleAssignmentsImpl_.potentialOwners.getName().equals(joinFieldName) ) {
      joins[1] = (ListJoin<PeopleAssignmentsImpl,OrganizationalEntityImpl>) join;
    }  else if( PeopleAssignmentsImpl_.taskStakeholders.getName().equals(joinFieldName) ) {
      joins[2] = (ListJoin<PeopleAssignmentsImpl,OrganizationalEntityImpl>) join;
    }
  }
  if( joins[0] == null ) {
    joins[0] = peopleAssignJoin.join(PeopleAssignmentsImpl_.businessAdministrators, JoinType.LEFT);
  }
  if( joins[1] == null ) {
    joins[1] = peopleAssignJoin.join(PeopleAssignmentsImpl_.potentialOwners, JoinType.LEFT);
  }
  if( joins[2] == null ) {
    joins[2] = peopleAssignJoin.join(PeopleAssignmentsImpl_.taskStakeholders, JoinType.LEFT);
  }
  assert joins[0] != null : "Could not find business administrators join!";
  assert joins[1] != null : "Could not find potential owners join!";
  assert joins[2] != null : "Could not find task stakeholders join!";
  return joins;
}

代码示例来源：origin: kiegroup/jbpm

for( Join<F, ?> join : grandparentJoin.getJoins() ) {
  if( join.getJavaType().equals(toAttrJoinType) ) {
   if( join.getAttribute().equals(parentJoinAttr) )  {
     fieldParentJoin = (Join<F, T>) join;
     if( ! JoinType.INNER.equals(fieldParentJoin.getJoinType()) ) {

代码示例来源：origin: org.omnifaces/omnipersistence

@Override
public Attribute<? super X, ?> getAttribute() {
  return join.getAttribute();
}

代码示例来源：origin: ActiveJpa/activejpa

private <T> Join<T, ?> getJoin(String name, Set<Join<T, ?>> joins) {
    for (Join<T, ?> join : joins) {
      if (join.getAttribute().getName().equals(name)) {
        return join;
      }
    }
    return null;
  }
}

代码示例来源：origin: org.apache.cxf/cxf-bundle-jaxrs

private Path<?> getExistingJoinProperty(From<?, ?> element, String prop) {
  final Set<?> joins = element.getJoins();
  for (Object object : joins) {
    Join<?, ?> join = (Join<?, ?>) object;
    if (join.getAttribute().getName().equals(prop)) {
      return join;
    }
  }
  return null;
}

代码示例来源：origin: apache/cxf

private Path<?> getExistingJoinProperty(From<?, ?> element, String prop) {
  final Set<?> joins = element.getJoins();
  for (Object object : joins) {
    Join<?, ?> join = (Join<?, ?>) object;
    if (join.getAttribute().getName().equals(prop)) {
      return join;
    }
  }
  return null;
}

代码示例来源：origin: org.apache.cxf/cxf-rt-rs-extension-search

private Path<?> getExistingJoinProperty(From<?, ?> element, String prop) {
  final Set<?> joins = element.getJoins();
  for (Object object : joins) {
    Join<?, ?> join = (Join<?, ?>) object;
    if (join.getAttribute().getName().equals(prop)) {
      return join;
    }
  }
  return null;
}

代码示例来源：origin: org.ligoj.bootstrap/bootstrap-business

/**
 * Retrieve an existing join within the ones within the given root and that match to given attribute.
 *
 * @param from
 *            the from source element.
 * @param attribute
 *            the attribute to join
 * @return The join/fetch path if it exists.
 * @param <U>
 *            The source type of the {@link Join}
 * @param <T>
 *            The resolved entity type of the path value.
 */
@SuppressWarnings("unchecked")
protected <U, T> PathImplementor<T> getJoinPath(final From<?, U> from, final Attribute<?, ?> attribute) {
  // Search within current joins
  for (final Join<U, ?> join : from.getJoins()) {
    if (join.getAttribute().equals(attribute)) {
      return fixAlias((Join<U, T>) join, aliasCounter);
    }
  }
  return null;
}

代码示例来源：origin: babyfish-ct/babyfish

private static boolean isLeftOrNonNullReferenceJoin(Join<?, ?> join, boolean dbSchemaStrict) {
    if (join.getAttribute().isCollection()) {
      return false;
    }
    if (join.getJoinType() == JoinType.LEFT) {
      return true;
    }
    if (!dbSchemaStrict) {
      return false;
    }
    SingularAttribute<?, ?> singularAttribute = (SingularAttribute<?, ?>)join.getAttribute();
    return
        !singularAttribute.isOptional() && 
        singularAttribute.getPersistentAttributeType() == PersistentAttributeType.MANY_TO_ONE;
  }
}

代码示例来源：origin: org.seedstack.addons.jpa/jpa

/**
   * Find an existing join for the property or create a new join.
   *
   * @param property property to be joined
   * @param from     clause letting us keep track of all already existing joins
   * @return the join
   */
  private static Join<?, ?> findOrCreateJoin(String property, From<?, ?> from) {
    for (Join<?, ?> rootJoin : from.getJoins()) {
      if (rootJoin.getAttribute().getName().equals(property)) {
        return rootJoin;
      }
    }
    return from.join(property);
  }
}

代码示例来源：origin: com.introproventures/graphql-jpa-query-schema

private Join<?,?> reuseJoin(From<?, ?> path, String fieldName, boolean outer) {
  for (Join<?,?> join : path.getJoins()) {
    if (join.getAttribute().getName().equals(fieldName)) {
      if ((join.getJoinType() == JoinType.LEFT) == outer) {
        logger.debug("Reusing existing join for field " + fieldName);
        return join;
      }
    }
  }
  return outer ? path.join(fieldName, JoinType.LEFT) : path.join(fieldName);
}

代码示例来源：origin: org.apache.openjpa/openjpa-persistence

protected void evalAccessPaths(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q) {
  Set<ClassMetaData> metas = new HashSet<ClassMetaData>();
  MetamodelImpl metamodel = q.getMetamodel();    
  for (Root<?> root : q.getRoots()) {
    metas.add(((AbstractManagedType<?>)root.getModel()).meta);
    for (Join<?,?> join : root.getJoins()) {
      Class<?> cls = join.getAttribute().getJavaType();
      if (join.getAttribute().isAssociation()) {
        ClassMetaData meta = metamodel.getRepository().getMetaData(cls, null, true);
        PersistenceType type = MetamodelImpl.getPersistenceType(meta);
        if (type == PersistenceType.ENTITY || type == PersistenceType.EMBEDDABLE) 
          metas.add(meta);
      }
    }
  }
  // TODO -- need to handle subqueries
  
  exps.accessPath = metas.toArray(new ClassMetaData[metas.size()]);
}

代码示例来源：origin: org.apache.openjpa/openjpa-all

protected void evalAccessPaths(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q) {
  Set<ClassMetaData> metas = new HashSet<ClassMetaData>();
  MetamodelImpl metamodel = q.getMetamodel();    
  for (Root<?> root : q.getRoots()) {
    metas.add(((AbstractManagedType<?>)root.getModel()).meta);
    for (Join<?,?> join : root.getJoins()) {
      Class<?> cls = join.getAttribute().getJavaType();
      if (join.getAttribute().isAssociation()) {
        ClassMetaData meta = metamodel.getRepository().getMetaData(cls, null, true);
        PersistenceType type = MetamodelImpl.getPersistenceType(meta);
        if (type == PersistenceType.ENTITY || type == PersistenceType.EMBEDDABLE) 
          metas.add(meta);
      }
    }
  }
  // TODO -- need to handle subqueries
  
  exps.accessPath = metas.toArray(new ClassMetaData[metas.size()]);
}

代码示例来源：origin: org.omnifaces/omnipersistence

private static void collectJoins(Path<?> path, Map<String, Path<?>> joins) {
  if (path instanceof From) {
    ((From<?, ?>) path).getJoins().forEach(join -> collectJoins(join, joins));
  }
  if (path instanceof FetchParent) {
    try {
      ((FetchParent<?, ?>) path).getFetches().stream().filter(fetch -> fetch instanceof Path).forEach(fetch -> collectJoins((Path<?>) fetch, joins));
    }
    catch (NullPointerException openJPAWillThrowThisOnEmptyFetches) {
      // Ignore and continue.
    }
  }
  if (path instanceof Join) {
    joins.put(((Join<?, ?>) path).getAttribute().getName(), path);
  }
  else if (path instanceof Fetch) {
    joins.put(((Fetch<?, ?>) path).getAttribute().getName(), path);
  }
}

代码示例来源：origin: com.introproventures/graphql-jpa-query-schema

private Join<?,?> reuseJoin(From<?, ?> path, String fieldName, boolean outer) {
  for (Join<?,?> join : path.getJoins()) {
    if (join.getAttribute().getName().equals(fieldName)) {
      if ((join.getJoinType() == JoinType.LEFT) == outer) {
        //logger.debug("Reusing existing join for field " + fieldName);
        return join;
      }
    }
  }
  return outer ? path.join(fieldName, JoinType.LEFT) : path.join(fieldName);
}

代码示例来源：origin: org.springframework.data/spring-data-jpa

/**
 * Returns an existing join for the given attribute if one already exists or creates a new one if not.
 *
 * @param from the {@link From} to get the current joins from.
 * @param attribute the {@link Attribute} to look for in the current joins.
 * @return will never be {@literal null}.
 */
private static Join<?, ?> getOrCreateJoin(From<?, ?> from, String attribute) {
  for (Join<?, ?> join : from.getJoins()) {
    boolean sameName = join.getAttribute().getName().equals(attribute);
    if (sameName && join.getJoinType().equals(JoinType.LEFT)) {
      return join;
    }
  }
  return from.join(attribute, JoinType.LEFT);
}

代码示例来源：origin: org.apache.openejb.patch/openjpa-persistence

protected void evalAccessPaths(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q) {
  Set<ClassMetaData> metas = new HashSet<ClassMetaData>();
  MetamodelImpl metamodel = q.getMetamodel();    
  for (Root<?> root : q.getRoots()) {
    metas.add(((AbstractManagedType<?>)root.getModel()).meta);
    for (Join<?,?> join : root.getJoins()) {
      Class<?> cls = join.getAttribute().getJavaType();
      if (join.getAttribute().isAssociation()) {
        ClassMetaData meta = metamodel.getRepository().getMetaData(cls, null, true);
        PersistenceType type = MetamodelImpl.getPersistenceType(meta);
        if (type == PersistenceType.ENTITY || type == PersistenceType.EMBEDDABLE) 
          metas.add(meta);
      }
    }
    for (Fetch<?,?> fetch : root.getFetches()) {
      metas.add(metamodel.getRepository().getCachedMetaData(fetch.getAttribute().getJavaType()));
    }
  }
  exps.accessPath = metas.toArray(new ClassMetaData[metas.size()]);
}

代码示例来源：origin: org.apache.openejb.patch/openjpa

protected void evalAccessPaths(QueryExpressions exps, ExpressionFactory factory, CriteriaQueryImpl<?> q) {
  Set<ClassMetaData> metas = new HashSet<ClassMetaData>();
  MetamodelImpl metamodel = q.getMetamodel();    
  for (Root<?> root : q.getRoots()) {
    metas.add(((AbstractManagedType<?>)root.getModel()).meta);
    for (Join<?,?> join : root.getJoins()) {
      Class<?> cls = join.getAttribute().getJavaType();
      if (join.getAttribute().isAssociation()) {
        ClassMetaData meta = metamodel.getRepository().getMetaData(cls, null, true);
        PersistenceType type = MetamodelImpl.getPersistenceType(meta);
        if (type == PersistenceType.ENTITY || type == PersistenceType.EMBEDDABLE) 
          metas.add(meta);
      }
    }
    for (Fetch<?,?> fetch : root.getFetches()) {
      metas.add(metamodel.getRepository().getCachedMetaData(fetch.getAttribute().getJavaType()));
    }
  }
  exps.accessPath = metas.toArray(new ClassMetaData[metas.size()]);
}

代码示例来源：origin: org.jboss.pressgang.ccms/pressgang-ccms-query

/**
 * Copy Joins
 *
 * @param from source Join
 * @param to   destination Join
 */
public static void copyJoins(From<?, ?> from, From<?, ?> to) {
  for (Join<?, ?> j : from.getJoins()) {
    Join<?, ?> toJoin = to.join(j.getAttribute().getName(), j.getJoinType());
    toJoin.alias(getOrCreateAlias(j));
    copyJoins(j, toJoin);
  }
  for (Fetch<?, ?> f : from.getFetches()) {
    Fetch<?, ?> toFetch = to.fetch(f.getAttribute().getName());
    copyFetches(f, toFetch);
  }
}

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