org.apache.cayenne.exp.parser

## Class ASTTrue

- java.lang.Object
- - org.apache.cayenne.exp.Expression
  - - org.apache.cayenne.exp.parser.SimpleNode
    - - org.apache.cayenne.exp.parser.ConditionNode
      - - org.apache.cayenne.exp.parser.ASTTrue

- All Implemented Interfaces:
    Serializable, Node, XMLSerializable

      public class ASTTrue
      extends ConditionNode

  Boolean true expression element Notice that there is one ASTTrue and one ASTFalse instead of a ASTBoolean with a Boolean value. The main reason for doing this is that a common ASTBoolean will have operand count of 1 and that will default to a prepared statmenet like " where ? and (...)", but we only need " where true and (...)".
  Since:
    3.0
  See Also:
    `ASTFalse`, Serialized Form

- - ### Field Summary

    - ### Fields inherited from class org.apache.cayenne.exp.parser.SimpleNode

      `children, id, parent`

    - ### Fields inherited from class org.apache.cayenne.exp.Expression

      `ADD, AND, ASTERISK, BETWEEN, BITWISE_AND, BITWISE_LEFT_SHIFT, BITWISE_NOT, BITWISE_OR, BITWISE_RIGHT_SHIFT, BITWISE_XOR, DB_PATH, DIVIDE, EQUAL_TO, FALSE, FULL_OBJECT, FUNCTION_CALL, GREATER_THAN, GREATER_THAN_EQUAL_TO, IN, LESS_THAN, LESS_THAN_EQUAL_TO, LIKE, LIKE_IGNORE_CASE, LIST, MULTIPLY, NEGATIVE, NOT, NOT_BETWEEN, NOT_EQUAL_TO, NOT_IN, NOT_LIKE, NOT_LIKE_IGNORE_CASE, OBJ_PATH, OR, PRUNED_NODE, SUBTRACT, TRUE, type`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `ASTTrue()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `appendAsEJBQL(List<Object> parameterAccumulator, Appendable out, String rootId)` Stores a String representation of Expression as EJBQL using a provided PrintWriter.
    `void` | `appendAsString(Appendable out)` Appends own content as a String to the provided Appendable.
    `protected Boolean` | `evaluateSubNode(Object o, Object[] evaluatedChildren)`
    `protected String` | `getExpressionOperator(int index)`
    `protected int` | `getRequiredChildrenCount()`
    `int` | `getType()` Returns a type of expression.
    `Expression` | `shallowCopy()` Creates a copy of this expression node, without copying children.

    - ### Methods inherited from class org.apache.cayenne.exp.parser.ConditionNode

      `evaluateNode, jjtSetParent`

    - ### Methods inherited from class org.apache.cayenne.exp.parser.SimpleNode

      `appendAsEJBQL, appendAsEscapedString, appendChildrenAsEJBQL, appendScalarAsString, connectChildren, encodeAsEJBQL, encodeAsString, encodeScalarAsEJBQL, evaluate, evaluateChild, expName, flattenTree, getEJBQLExpressionOperator, getOperand, getOperandCount, getPathAliases, jjtAddChild, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, notExp, pruneNodeForPrunedChild, setOperand, unwrapChild, wrapChild`

    - ### Methods inherited from class org.apache.cayenne.exp.Expression

      `andExp, andExp, deepCopy, encodeAsXML, equals, expWithParameters, expWithParameters, filter, filterObjects, first, fromString, hashCode, joinExp, joinExp, match, orExp, orExp, params, params, paramsArray, setType, toEJBQL, toEJBQL, toString, transform, transformExpression, traverse, traverse`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### ASTTrue

          public ASTTrue()

  - ### Method Detail

    - #### getRequiredChildrenCount

          protected int getRequiredChildrenCount()

      Specified by:
        `getRequiredChildrenCount` in class `ConditionNode`

    - #### evaluateSubNode

          protected Boolean evaluateSubNode(Object o,
                                            Object[] evaluatedChildren)
                                     throws Exception

      Specified by:
        `evaluateSubNode` in class `ConditionNode`
      Throws:
        `Exception`

    - #### getExpressionOperator

          protected String getExpressionOperator(int index)

      Specified by:
        `getExpressionOperator` in class `SimpleNode`

    - #### shallowCopy

          public Expression shallowCopy()

      Description copied from class: `Expression`
      Creates a copy of this expression node, without copying children.
      Specified by:
        `shallowCopy` in class `Expression`

    - #### getType

          public int getType()

      Description copied from class: `Expression`
      Returns a type of expression. Most common types are defined as public static fields of this interface.
      Overrides:
        `getType` in class `Expression`

    - #### appendAsString

          public void appendAsString(Appendable out)
                              throws IOException

      Description copied from class: `Expression`
      Appends own content as a String to the provided Appendable.
      Overrides:
        `appendAsString` in class `SimpleNode`
      Throws:
        `IOException`
      Since:
        4.0

    - #### appendAsEJBQL

          public void appendAsEJBQL(List<Object> parameterAccumulator,
                                    Appendable out,
                                    String rootId)
                             throws IOException

      Description copied from class: `Expression`
      Stores a String representation of Expression as EJBQL using a provided PrintWriter. DB path expressions produce non-standard EJBQL path expressions. If the parameterAccumulator is supplied then as the EJBQL is output, it may load parameters into this list. In this case, the EJBQL output will contain reference to positional parameters. If no parameterAccumulator is supplied and a scalar type is encountered for which there is no EJBQL literal representation (such as dates) then this method will throw a runtime exception to indicate that it was not possible to generate a string-only representation of the Expression in EJBQL.
      Overrides:
        `appendAsEJBQL` in class `SimpleNode`
      Throws:
        `IOException`
      Since:
        4.0

Copyright © 2001–2018 Apache Cayenne. All rights reserved.