Package com.github.collinalpert.java2db.queries

Class QueryConstraints

java.lang.Object
com.github.collinalpert.java2db.queries.QueryConstraints
public class QueryConstraints
extends java.lang.Object
A class which administers default query constraints set for entities.
Author:
Collin Alpert

  • Constructor Summary

    Constructors 
    Constructor Description
    QueryConstraints()  

  • Method Summary

    Modifier and Type Method Description
    static <E extends BaseEntity>
    void    		 addConstraint​(java.lang.Class<E> clazz, com.github.collinalpert.lambda2sql.functions.SqlPredicate<E> predicate)
    Adds a query constraint to a query made with a certain entity.
    static <E extends BaseEntity>
    com.github.collinalpert.lambda2sql.functions.SqlPredicate<E>    		 getConstraints​(java.lang.Class<E> clazz)
    Retrieves a composition SqlPredicate for all constraints that have been added for a class or any superclass of it.
    static void removeConstraints​(java.lang.Class<? extends BaseEntity> clazz)
    Removes all query constraints which were set for a specific entity.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

  • Method Details

    • getConstraints

      public static <E extends BaseEntity> com.github.collinalpert.lambda2sql.functions.SqlPredicate<E> getConstraints​(java.lang.Class<E> clazz)
      Retrieves a composition SqlPredicate for all constraints that have been added for a class or any superclass of it.
      Type Parameters:
      E - The type of the class to get the constraints for.
      Parameters:
      clazz - The class to retrieve query constraints from.
      Returns:
      A SqlPredicate describing the added constraints.

    • addConstraint

      public static <E extends BaseEntity> void addConstraint​(java.lang.Class<E> clazz, com.github.collinalpert.lambda2sql.functions.SqlPredicate<E> predicate)
      Adds a query constraint to a query made with a certain entity. This means that any query made with this entity will include this predicate.
      Type Parameters:
      E - The type of the entity.
      Parameters:
      clazz - The entity to add the constraint to.
      predicate - The constraint.

    • removeConstraints

      public static void removeConstraints​(java.lang.Class<? extends BaseEntity> clazz)
      Removes all query constraints which were set for a specific entity.
      Parameters:
      clazz - The entity class to remove the constraints for.