org.apache.cayenne.ejbql.parser

## Class SimpleNode

- java.lang.Object
- - org.apache.cayenne.ejbql.parser.SimpleNode

- All Implemented Interfaces:
    Serializable, EJBQLExpression, Node
  Direct Known Subclasses:
    AggregateConditionNode, EJBQLAbs, EJBQLAbstractSchemaName, EJBQLAdd, EJBQLAggregate, EJBQLAggregateColumn, EJBQLAll, EJBQLAny, EJBQLAscending, EJBQLBetween, EJBQLBooleanLiteral, EJBQLClassName, EJBQLConcat, EJBQLConstructor, EJBQLConstructorParameter, EJBQLConstructorParameters, EJBQLCurrentDate, EJBQLCurrentTime, EJBQLCurrentTimestamp, EJBQLDecimalLiteral, EJBQLDelete, EJBQLDescending, EJBQLDistinct, EJBQLDivide, EJBQLEquals, EJBQLEscapeCharacter, EJBQLExists, EJBQLFrom, EJBQLFromItem, EJBQLGreaterOrEqual, EJBQLGreaterThan, EJBQLGroupBy, EJBQLHaving, EJBQLIdentificationVariable, EJBQLIdentifier, EJBQLIn, EJBQLIntegerLiteral, EJBQLIsEmpty, EJBQLIsNull, EJBQLJoin, EJBQLLength, EJBQLLessOrEqual, EJBQLLessThan, EJBQLLike, EJBQLLocate, EJBQLLower, EJBQLMemberOf, EJBQLMod, EJBQLMultiply, EJBQLNamedInputParameter, EJBQLNegative, EJBQLNotEquals, EJBQLOrderBy, EJBQLOrderByItem, EJBQLPath, EJBQLPatternValue, EJBQLPositionalInputParameter, EJBQLSelect, EJBQLSelectClause, EJBQLSelectExpression, EJBQLSelectExpressions, EJBQLSize, EJBQLSqrt, EJBQLStringLiteral, EJBQLSubselect, EJBQLSubstring, EJBQLSubtract, EJBQLTok, EJBQLTrim, EJBQLTrimCharacter, EJBQLTrimSpecification, EJBQLUpdate, EJBQLUpdateField, EJBQLUpdateItem, EJBQLUpdateValue, EJBQLUpper, EJBQLWhere

      public abstract class SimpleNode
      extends Object
      implements Node, Serializable, EJBQLExpression

  A base node for the EJBQL concrete nodes that satisfies JJTree requirements.
  Since:
    3.0
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `SimpleNode(int id)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `EJBQLExpression` | `getChild(int index)` Returns a child expression node at the specified index.
    `int` | `getChildrenCount()` Returns a number of child operands of this expression node.
    `String` | `getName()`
    `String` | `getText()` Returns a text property of the node.
    `boolean` | `isNegated()` Returns an optional boolean flag that negates the value of the expression.
    `void` | `jjtAddChild(Node n, int i)` This method tells the node to add its argument to the node's list of children.
    `void` | `jjtClose()` This method is called after all the child nodes have been added.
    `Node` | `jjtGetChild(int i)` This method returns a child node.
    `int` | `jjtGetNumChildren()` Return the number of children the node has.
    `Node` | `jjtGetParent()`
    `void` | `jjtOpen()` This method is called after the node has been made the current node.
    `void` | `jjtSetParent(Node parent)` This pair of methods are used to inform the node of its parent.
    `void` | `setText(String text)`
    `String` | `toString()`
    `void` | `visit(EJBQLExpressionVisitor visitor)` A recursive visit method that passes a visitor to this node and all its children, depth first.
    `protected boolean` | `visitChild(EJBQLExpressionVisitor visitor, int childIndex)` Recursively visits a child at the specified index.
    `protected boolean` | `visitNode(EJBQLExpressionVisitor visitor)` Visits this node without recursion.

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

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

- - ### Constructor Detail

    - #### SimpleNode

          public SimpleNode(int id)

  - ### Method Detail

    - #### getText

          public String getText()

      Description copied from interface: `EJBQLExpression`
      Returns a text property of the node.
      Specified by:
        `getText` in interface `EJBQLExpression`

    - #### isNegated

          public boolean isNegated()

      Description copied from interface: `EJBQLExpression`
      Returns an optional boolean flag that negates the value of the expression.
      Specified by:
        `isNegated` in interface `EJBQLExpression`

    - #### visit

          public void visit(EJBQLExpressionVisitor visitor)

      A recursive visit method that passes a visitor to this node and all its children, depth first.
      Specified by:
        `visit` in interface `EJBQLExpression`

    - #### visitNode

          protected boolean visitNode(EJBQLExpressionVisitor visitor)

      Visits this node without recursion. Default implementation simply returns true. Subclasses override this method to call an appropriate visitor method.

    - #### visitChild

          protected boolean visitChild(EJBQLExpressionVisitor visitor,
                           int childIndex)

      Recursively visits a child at the specified index. Subclasses override this method if they desire to implement callbacks after visiting each child.

    - #### getChild

          public EJBQLExpression getChild(int index)

      Description copied from interface: `EJBQLExpression`
      Returns a child expression node at the specified index.
      Specified by:
        `getChild` in interface `EJBQLExpression`

    - #### getChildrenCount

          public int getChildrenCount()

      Description copied from interface: `EJBQLExpression`
      Returns a number of child operands of this expression node.
      Specified by:
        `getChildrenCount` in interface `EJBQLExpression`

    - #### getName

          public String getName()

    - #### jjtOpen

          public void jjtOpen()

      Description copied from interface: `Node`
      This method is called after the node has been made the current node. It indicates that child nodes can now be added to it.
      Specified by:
        `jjtOpen` in interface `Node`

    - #### jjtClose

          public void jjtClose()

      Description copied from interface: `Node`
      This method is called after all the child nodes have been added.
      Specified by:
        `jjtClose` in interface `Node`

    - #### jjtSetParent

          public void jjtSetParent(Node parent)

      Description copied from interface: `Node`
      This pair of methods are used to inform the node of its parent.
      Specified by:
        `jjtSetParent` in interface `Node`

    - #### jjtGetParent

          public Node jjtGetParent()

      Specified by:
        `jjtGetParent` in interface `Node`

    - #### jjtAddChild

          public void jjtAddChild(Node n,
                         int i)

      Description copied from interface: `Node`
      This method tells the node to add its argument to the node's list of children.
      Specified by:
        `jjtAddChild` in interface `Node`

    - #### jjtGetChild

          public Node jjtGetChild(int i)

      Description copied from interface: `Node`
      This method returns a child node. The children are numbered from zero, left to right.
      Specified by:
        `jjtGetChild` in interface `Node`

    - #### jjtGetNumChildren

          public int jjtGetNumChildren()

      Description copied from interface: `Node`
      Return the number of children the node has.
      Specified by:
        `jjtGetNumChildren` in interface `Node`

    - #### setText

          public void setText(String text)

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

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