Interface Node

All Superinterfaces:
JavaSource
All Known Implementing Classes:
ASTAdd, ASTAnd, ASTAssign, ASTBitAnd, ASTBitNegate, ASTBitOr, ASTChain, ASTConst, ASTCtor, ASTDivide, ASTEq, ASTEval, ASTGreater, ASTGreaterEq, ASTIn, ASTInstanceof, ASTKeyValue, ASTLess, ASTLessEq, ASTList, ASTMap, ASTMethod, ASTMultiply, ASTNegate, ASTNot, ASTNotEq, ASTNotIn, ASTOr, ASTProject, ASTProperty, ASTRemainder, ASTRootVarRef, ASTSelect, ASTSelectFirst, ASTSelectLast, ASTSequence, ASTShiftLeft, ASTShiftRight, ASTStaticField, ASTStaticMethod, ASTSubtract, ASTTest, ASTThisVarRef, ASTUnsignedShiftRight, ASTVarRef, ASTXor, BooleanExpression, ComparisonExpression, ExpressionNode, NumericExpression, SimpleNode
public interface Node extends JavaSource
JJTree interface for AST nodes, as modified to handle the OGNL operations getValue and setValue. JJTree's original comment:

All AST nodes must implement this interface. It provides basic machinery for constructing the parent and child relationships between nodes.

  • Method Details

    • jjtOpen

      void jjtOpen()
      This method is called after the node has been made the current node. It indicates that child nodes can now be added to it.

    • jjtClose

      void jjtClose()
      This method is called after all the child nodes have been added.

    • jjtSetParent

      void jjtSetParent(Node n)
      This pair of methods are used to inform the node of its parent.
      Parameters:
      n - the Node to make the parent of this node.

    • jjtGetParent

      Node jjtGetParent()

    • jjtAddChild

      void jjtAddChild(Node n, int i)
      This method tells the node to add its argument to the node's list of children.
      Parameters:
      n - the Node to add as a child of this node.
      i - the position at which to add the child node.

    • jjtGetChild

      Node jjtGetChild(int i)
      This method returns a child node. The children are numbered from zero, left to right.
      Parameters:
      i - the position from which to get the child node.
      Returns:
      the child Node at position i.

    • jjtGetNumChildren

      int jjtGetNumChildren()
      Return the number of children the node has.
      Returns:
      the number of children for this node.

    • getValue

      Object getValue(OgnlContext context, Object source) throws OgnlException
      Extracts the value from the given source object that is appropriate for this node within the given context.
      Parameters:
      context - the OgnlContext within which to perform the operation.
      source - the Object from which to get the value.
      Returns:
      the value from the source (as appropriate within the provided context).
      Throws:
      OgnlException - if the value get fails.

    • setValue

      void setValue(OgnlContext context, Object target, Object value) throws OgnlException
      Sets the given value in the given target as appropriate for this node within the given context.
      Parameters:
      context - the OgnlContext within which to perform the operation.
      target - the Object upon which to set the value.
      value - the Object representing the value to apply to the target.
      Throws:
      OgnlException - if the value set fails.

    • getAccessor

      ExpressionAccessor getAccessor()
      Gets the compiled bytecode enhanced expression accessor for getting/setting values.
      Returns:
      The accessor for this node, or null if none has been compiled for it.

    • setAccessor

      void setAccessor(ExpressionAccessor accessor)
      Sets a new compiled accessor for this node expression.
      Parameters:
      accessor - The compiled representation of this node.