com.querydsl.core.types.ExpressionUtils.as()方法的使用及代码示例

x33g5p2x  于2022-01-19 转载在 其他  
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本文整理了Java中com.querydsl.core.types.ExpressionUtils.as()方法的一些代码示例，展示了ExpressionUtils.as()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。ExpressionUtils.as()方法的具体详情如下：
包路径：com.querydsl.core.types.ExpressionUtils
类名称：ExpressionUtils
方法名：as

ExpressionUtils.as介绍

[英]Create an alias expression with the given source and alias
[中]使用给定的源和别名创建别名表达式

代码示例

代码示例来源：origin: querydsl/querydsl

@SuppressWarnings("unchecked")
protected <D> Expression<D> createAlias(Expression<?> expr, Path<D> alias) {
  assertRoot(alias);
  return ExpressionUtils.as((Expression) expr, alias);
}

代码示例来源：origin: querydsl/querydsl

/**
 * Create an alias expression with the given source and alias
 *
 * @param <D> type of expression
 * @param source source
 * @param alias alias
 * @return source as alias
 */
public static <D> Expression<D> as(Expression<D> source, String alias) {
  return as(source, path(source.getType(), alias));
}

代码示例来源：origin: querydsl/querydsl

@SuppressWarnings("unchecked")
public Q on(Predicate... conditions) {
  queryMixin.addJoin(JoinType.JOIN, ExpressionUtils.as((Path) ref, target));
  queryMixin.on(conditions);
  return queryMixin.getSelf();
}

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

/**
   * Add the given join conditions.
   *
   * @param conditions must not be {@literal null}.
   * @return the target {@link QueryMixin}.
   * @see QueryMixin#on(Predicate)
   */
  @SuppressWarnings("unchecked")
  public Q on(Predicate... conditions) {

    queryMixin.addJoin(JoinType.JOIN, ExpressionUtils.as((Path) ref, target));
    queryMixin.on(conditions);
    return queryMixin.getSelf();
  }
}

代码示例来源：origin: querydsl/querydsl

@Test
public void with_nested_factoryExpression2() {
  QBean<Entity> beanProjection = new QBean<Entity>(Entity.class,
      age, ExpressionUtils.as(new Concatenation(name, name2), "name"));
  FactoryExpression<Entity> wrappedProjection = FactoryExpressionUtils.wrap(beanProjection);
  Entity bean = wrappedProjection.newInstance(30, "Fri","tz");
  assertEquals("Fritz", bean.getName());
}

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

/**
   * Add the given join conditions.
   *
   * @param conditions must not be {@literal null}.
   * @return the target {@link QueryMixin}.
   * @see QueryMixin#on(Predicate)
   */
  @SuppressWarnings("unchecked")
  public Q on(Predicate... conditions) {

    queryMixin.addJoin(JoinType.JOIN, ExpressionUtils.as((Path) ref, target));
    queryMixin.on(conditions);
    return queryMixin.getSelf();
  }
}

代码示例来源：origin: com.querydsl/querydsl-sql

@Override
public Expression<T> as(Path<T> alias) {
  return ExpressionUtils.as(this, alias);
}

代码示例来源：origin: com.querydsl/querydsl-sql

@Override
public Expression<T> as(String alias) {
  return ExpressionUtils.as(this, alias);
}

代码示例来源：origin: com.querydsl/querydsl-sql

@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
public Q from(SubQueryExpression<?> subQuery, Path<?> alias) {
  return queryMixin.from(ExpressionUtils.as((Expression) subQuery, alias));
}

代码示例来源：origin: com.querydsl/querydsl-core

@SuppressWarnings("unchecked")
protected <D> Expression<D> createAlias(Expression<?> expr, Path<D> alias) {
  assertRoot(alias);
  return ExpressionUtils.as((Expression) expr, alias);
}

代码示例来源：origin: com.querydsl/querydsl-sql

public static <T> Expression<T> union(List<SubQueryExpression<T>> union, Path<T> alias,
    boolean unionAll) {
  final Expression<T> rv = union(union, unionAll);
  return ExpressionUtils.as(rv, alias);
}

代码示例来源：origin: com.querydsl/querydsl-sql

public final SQLSerializer handleSelect(final String sep, final List<? extends Expression<?>> expressions) {
  if (inSubquery) {
    Set<String> names = Sets.newHashSet();
    List<Expression<?>> replacements = Lists.newArrayList();
    for (Expression<?> expr : expressions) {
      if (expr instanceof Path) {
        String name = ColumnMetadata.getName((Path<?>) expr);
        if (!names.add(name.toLowerCase())) {
          expr = ExpressionUtils.as(expr, "col__" + name + replacements.size());
        }
      }
      replacements.add(expr);
    }
    return handle(sep, replacements);
  } else {
    return handle(sep, expressions);
  }
}

代码示例来源：origin: com.querydsl/querydsl-core

/**
 * Create an alias expression with the given source and alias
 *
 * @param <D> type of expression
 * @param source source
 * @param alias alias
 * @return source as alias
 */
public static <D> Expression<D> as(Expression<D> source, String alias) {
  return as(source, path(source.getType(), alias));
}

代码示例来源：origin: com.querydsl/querydsl-sql

rv.add(ExpressionUtils.as(column, "col" + (++counter)));

代码示例来源：origin: com.querydsl/querydsl-sql

@SuppressWarnings("unchecked")
protected SQLSerializer serialize(boolean forCountRow) {
  SQLSerializer serializer = createSerializer();
  if (union != null) {
    if (queryMixin.getMetadata().getProjection() == null ||
      expandProjection(queryMixin.getMetadata().getProjection())
      .equals(expandProjection(firstUnionSubQuery.getMetadata().getProjection()))) {
      serializer.serializeUnion(union, queryMixin.getMetadata(), unionAll);
    } else {
      QueryMixin<Q> mixin2 = new QueryMixin<Q>(queryMixin.getMetadata().clone());
      Set<Path<?>> paths = getRootPaths(expandProjection(mixin2.getMetadata().getProjection()));
      if (paths.isEmpty()) {
        mixin2.from(ExpressionUtils.as((Expression) union, defaultQueryAlias));
      } else if (paths.size() == 1) {
        mixin2.from(ExpressionUtils.as((Expression) union, paths.iterator().next()));
      } else {
        throw new IllegalStateException("Unable to create serialize union");
      }
      serializer.serialize(mixin2.getMetadata(), forCountRow);
    }
  } else {
    serializer.serialize(queryMixin.getMetadata(), forCountRow);
  }
  return serializer;
}

代码示例来源：origin: com.querydsl/querydsl-jpa

@SuppressWarnings("unchecked")
@Override
public Expression<?> visit(Path<?> expr, @Nullable Void context) {
  expr = (Path<?>) super.visit(expr, null);
  PathMetadata pathMetadata = expr.getMetadata();
  if (pathMetadata.getPathType() == PathType.LISTVALUE
      || pathMetadata.getPathType() == PathType.LISTVALUE_CONSTANT) {
    Path<?> replacement = replacements.get(expr);
    if (replacement == null) {
      // join parent as path123 on index(path123) = ...
      Path parent = shorten(pathMetadata.getParent(), true);
      replacement = ExpressionUtils.path(expr.getType(),
          ExpressionUtils.createRootVariable(parent, replacements.size()));
      metadata.addJoin(JoinType.LEFTJOIN, ExpressionUtils.as(parent, replacement));
      metadata.addJoinCondition(ExpressionUtils.eq(
          (Expression) Expressions.operation(Integer.class, JPQLOps.INDEX, replacement),
          ExpressionUtils.toExpression(pathMetadata.getElement())));
      replacements.put(expr, replacement);
    }
    return replacement;
  } else {
    return super.visit(expr, context);
  }
}

代码示例来源：origin: com.querydsl/querydsl-jpa

@SuppressWarnings("unchecked")
@Override
public Expression<?> visit(Path<?> expr, @Nullable Void context) {
  expr = (Path<?>) super.visit(expr, null);
  PathMetadata pathMetadata = expr.getMetadata();
  if (pathMetadata.getPathType() == PathType.MAPVALUE
   || pathMetadata.getPathType() == PathType.MAPVALUE_CONSTANT) {
    Path<?> replacement = replacements.get(expr);
    if (replacement == null) {
      // join parent as path123 on key(path123) = ...
      Path parent = shorten(pathMetadata.getParent(), true);
      ParameterizedExpression parExpr = (ParameterizedExpression) pathMetadata.getParent();
      replacement = ExpressionUtils.path(parExpr.getParameter(1),
          ExpressionUtils.createRootVariable(parent, replacements.size()));
      metadata.addJoin(JoinType.LEFTJOIN, ExpressionUtils.as(parent, replacement));
      metadata.addJoinCondition(ExpressionUtils.eq(
          Expressions.operation(parExpr.getParameter(0), JPQLOps.KEY, replacement),
          ExpressionUtils.toExpression(pathMetadata.getElement())));
      replacements.put(expr, replacement);
    }
    return replacement;
  } else {
    return super.visit(expr, context);
  }
}

代码示例来源：origin: com.querydsl/querydsl-jpa

@SuppressWarnings("unchecked")
@Override
public Expression<?> visit(Operation<?> expr, @Nullable Void context) {
  if (expr.getOperator() == Ops.CONTAINS_KEY) {
    ParameterizedExpression map = (ParameterizedExpression<?>) expr.getArg(0);
    Expression key = expr.getArg(1);
    Path replacement = ExpressionUtils.path(map.getParameter(1),
        ExpressionUtils.createRootVariable((Path<?>) map, Math.abs(expr.hashCode())));
    metadata.addJoin(JoinType.LEFTJOIN, ExpressionUtils.as(map, replacement));
    metadata.addJoinCondition(ExpressionUtils.eq(
        Expressions.operation(map.getParameter(0), JPQLOps.KEY, replacement),
        key));
    return ExpressionUtils.isNotNull(replacement);
  } else if (expr.getOperator() == Ops.CONTAINS_VALUE) {
    ParameterizedExpression<?> map = (ParameterizedExpression<?>) expr.getArg(0);
    Expression<?> value = expr.getArg(1);
    return Expressions.predicate(JPQLOps.MEMBER_OF, value, map);
  } else {
    return super.visit(expr, context);
  }
}

代码示例来源：origin: com.querydsl/querydsl-jpa

/**
 * Shorten the parent path to a length of max 2 elements
 */
private Path<?> shorten(Path<?> path, boolean outer) {
  if (aliases.containsKey(path)) {
    return aliases.get(path);
  } else if (path.getMetadata().isRoot()) {
    return path;
  } else if (path.getMetadata().getParent().getMetadata().isRoot() && outer) {
    return path;
  } else {
    Class<?> type = JPAQueryMixin.getElementTypeOrType(path);
    Path<?> parent = shorten(path.getMetadata().getParent(), false);
    Path oldPath = ExpressionUtils.path(path.getType(),
        new PathMetadata(parent, path.getMetadata().getElement(), path.getMetadata().getPathType()));
    if (oldPath.getMetadata().getParent().getMetadata().isRoot() && outer) {
      return oldPath;
    } else {
      Path newPath = ExpressionUtils.path(type, ExpressionUtils.createRootVariable(oldPath));
      aliases.put(path, newPath);
      metadata.addJoin(JoinType.LEFTJOIN, ExpressionUtils.as(oldPath, newPath));
      return newPath;
    }
  }
}

代码示例来源：origin: com.querydsl/querydsl-jpa

/**
 * Shorten the parent path to a length of max 2 elements
 */
private Path<?> shorten(Path<?> path, boolean outer) {
  if (aliases.containsKey(path)) {
    return aliases.get(path);
  } else if (path.getMetadata().isRoot()) {
    return path;
  } else if (path.getMetadata().getParent().getMetadata().isRoot() && outer) {
    return path;
  } else {
    Class<?> type = JPAQueryMixin.getElementTypeOrType(path);
    Path<?> parent = shorten(path.getMetadata().getParent(), false);
    Path oldPath = ExpressionUtils.path(path.getType(),
        new PathMetadata(parent, path.getMetadata().getElement(), path.getMetadata().getPathType()));
    if (oldPath.getMetadata().getParent().getMetadata().isRoot() && outer) {
      return oldPath;
    } else {
      Path newPath = ExpressionUtils.path(type, ExpressionUtils.createRootVariable(oldPath));
      aliases.put(path, newPath);
      metadata.addJoin(JoinType.LEFTJOIN, ExpressionUtils.as(oldPath, newPath));
      return newPath;
    }
  }
}

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