Node (Apache Tomcat 7.0.104 API Documentation)

org.apache.el.parser

## Interface Node

- All Known Implementing Classes:
    ArithmeticNode, AstAnd, AstBracketSuffix, AstChoice, AstCompositeExpression, AstDeferredExpression, AstDiv, AstDotSuffix, AstDynamicExpression, AstEmpty, AstEqual, AstFalse, AstFloatingPoint, AstFunction, AstGreaterThan, AstGreaterThanEqual, AstIdentifier, AstInteger, AstLessThan, AstLessThanEqual, AstLiteralExpression, AstMethodParameters, AstMinus, AstMod, AstMult, AstNegative, AstNot, AstNotEqual, AstNull, AstOr, AstPlus, AstString, AstTrue, AstValue, BooleanNode, SimpleNode

      public interface Node

  Author:
    Jacob Hookom [jacob@hookom.net]

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `accept(NodeVisitor visitor)`
    `String` | `getImage()`
    `MethodInfo` | `getMethodInfo(EvaluationContext ctx, Class<?>[] paramTypes)`
    `Class<?>` | `getType(EvaluationContext ctx)`
    `Object` | `getValue(EvaluationContext ctx)`
    `ValueReference` | `getValueReference(EvaluationContext ctx)`
    `Object` | `invoke(EvaluationContext ctx, Class<?>[] paramTypes, Object[] paramValues)`
    `boolean` | `isParametersProvided()`
    `boolean` | `isReadOnly(EvaluationContext ctx)`
    `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 n)` This pair of methods are used to inform the node of its parent.
    `void` | `setValue(EvaluationContext ctx, Object value)`

- - ### Method Detail

    - #### 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.

    - #### 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.

    - #### jjtGetChild

          Node jjtGetChild(int i)

      This method returns a child node. The children are numbered from zero, left to right.

    - #### jjtGetNumChildren

          int jjtGetNumChildren()

      Return the number of children the node has.

    - #### getImage

          String getImage()

    - #### getValue

          Object getValue(EvaluationContext ctx)
                          throws ELException

      Throws:
        `ELException`

    - #### setValue

          void setValue(EvaluationContext ctx,
                      Object value)
                        throws ELException

      Throws:
        `ELException`

    - #### getType

          Class<?> getType(EvaluationContext ctx)
                           throws ELException

      Throws:
        `ELException`

    - #### isReadOnly

          boolean isReadOnly(EvaluationContext ctx)
                             throws ELException

      Throws:
        `ELException`

    - #### accept

          void accept(NodeVisitor visitor)
                      throws Exception

      Throws:
        `Exception`

    - #### getMethodInfo

          MethodInfo getMethodInfo(EvaluationContext ctx,
                                 Class<?>[] paramTypes)
                                   throws ELException

      Throws:
        `ELException`

    - #### invoke

          Object invoke(EvaluationContext ctx,
                      Class<?>[] paramTypes,
                      Object[] paramValues)
                        throws ELException

      Throws:
        `ELException`

    - #### getValueReference

          ValueReference getValueReference(EvaluationContext ctx)

      Since:
        EL 2.2

    - #### isParametersProvided

          boolean isParametersProvided()

      Since:
        EL 2.2

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