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    • com.querydsl.core.alias.Alias Maven / Gradle / Ivy

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    /*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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 com.querydsl.core.alias;

import com.querydsl.core.types.EntityPath;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.Path;
import com.querydsl.core.types.dsl.*;
import com.querydsl.core.util.StringUtils;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.jetbrains.annotations.Nullable;

/**
 * {@code Alias} provides alias factory methods
 *
 * 
    Example:
 *
 * 
    {@code
 * Employee e = alias(Employee.class, "e");
 * for (String name : query.from($(e),employees)
 *     .where($(e.getDepartment().getId()).eq(1001))
 *     .list($(e.getName()))) {
 *     System.out.println(name);
 * }
 * }
    
 *
 * 
    using the following static imports
 *
 * 
    {@code
 * import static com.mysema.query.alias.Alias.$;
 * import static com.mysema.query.alias.Alias.alias;
 * }
    
 *
 * @author tiwe
 */
@SuppressWarnings("PMD")
public final class Alias {

  private static final AliasFactory aliasFactory =
      new AliasFactory(new DefaultPathFactory(), new DefaultTypeSystem());

  private static final SimplePath it = Expressions.path(Object.class, "it");

  // exclude $-methods from Checkstyle checks
  // CHECKSTYLE:OFF
  /**
   * Convert the given alias to an expression
   *
   * @param 
   * @return expression
   */
  public static > D $() {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @param 
   * @return expression
   */
  public static  ArrayPath $(D[] arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static NumberPath $(BigDecimal arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static NumberPath $(BigInteger arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static BooleanPath $(Boolean arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static NumberPath $(Byte arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @param 
   * @return expression
   */
  public static > EnumPath $(T arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @param 
   * @return expression
   */
  @SuppressWarnings("unchecked")
  public static  CollectionPath> $(Collection arg) {
    final Object current = aliasFactory.getCurrentAndReset();
    if (arg instanceof CollectionPath) {
      return (CollectionPath>) arg; // NOSONAR
    } else if (arg instanceof ManagedObject) {
      return (CollectionPath>) ((ManagedObject) arg).__mappedPath();
    } else {
      return (CollectionPath>) current;
    }
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @param 
   * @return expression
   */
  public static > ComparablePath $(D arg) {
    return Alias.getPath(arg);
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static NumberPath $(Double arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static NumberPath $(Float arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static NumberPath $(Integer arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static DatePath $(java.sql.Date arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static DateTimePath $(java.util.Date arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @param 
   * @return expression
   */
  @SuppressWarnings("unchecked")
  public static  ListPath> $(List arg) {
    final Object current = aliasFactory.getCurrentAndReset();
    if (arg instanceof ListPath) {
      return (ListPath>) arg; // NOSONAR
    } else if (arg instanceof ManagedObject) {
      return (ListPath>) ((ManagedObject) arg).__mappedPath();
    } else {
      return (ListPath>) current;
    }
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static NumberPath $(Long arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @param 
   * @param 
   * @return expression
   */
  @SuppressWarnings("unchecked")
  public static  MapPath> $(Map arg) {
    final Object current = aliasFactory.getCurrentAndReset();
    if (arg instanceof MapPath) {
      return (MapPath>) arg; // NOSONAR
    } else if (arg instanceof ManagedObject) {
      return (MapPath>) ((ManagedObject) arg).__mappedPath();
    } else {
      return (MapPath>) current;
    }
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @param 
   * @return expression
   */
  @SuppressWarnings("unchecked")
  public static  SetPath> $(Set arg) {
    final Object current = aliasFactory.getCurrentAndReset();
    if (arg instanceof SetPath) {
      return (SetPath>) arg; // NOSONAR
    } else if (arg instanceof ManagedObject) {
      return (SetPath>) ((ManagedObject) arg).__mappedPath();
    } else {
      return (SetPath>) current;
    }
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static NumberPath $(Short arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static StringPath $(String arg) {
    return aliasFactory.getCurrentAndReset();
  }

  /**
   * Convert the given alias to an expression
   *
   * @param arg alias
   * @return expression
   */
  public static TimePath