org.apache.cayenne.exp.parser

## Class ASTScalar

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

- All Implemented Interfaces:
    Serializable, Node, XMLSerializable
  Direct Known Subclasses:
    ASTNamedParameter

      public class ASTScalar
      extends SimpleNode

  A scalar value wrapper expression.
  Since:
    1.1
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected Object` | `value`

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

      `children, id, parent`

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

      `ADD, AND, BETWEEN, BITWISE_AND, BITWISE_NOT, BITWISE_OR, BITWISE_XOR, DB_PATH, DIVIDE, EQUAL_TO, FALSE, 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
    `ASTScalar()`
    `ASTScalar(Object value)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `encodeAsEJBQL(PrintWriter pw, String rootId)` Stores a String representation of Expression as EJBQL using a provided PrintWriter.
    `void` | `encodeAsString(PrintWriter pw)` Stores a String representation of Expression using a provided PrintWriter.
    `protected Object` | `evaluateNode(Object o)` Evaluates itself with object, pushing result on the stack.
    `protected String` | `getExpressionOperator(int index)`
    `Object` | `getValue()`
    `void` | `setValue(Object value)`
    `Expression` | `shallowCopy()` Creates a copy of this expression node, without copying children.

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

      `connectChildren, encodeAsEscapedString, encodeChildrenAsEJBQL, encodeScalarAsString, evaluate, evaluateChild, expName, flattenTree, getEJBQLExpressionOperator, getOperand, getOperandCount, getPathAliases, jjtAddChild, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, jjtSetParent, notExp, pruneNodeForPrunedChild, setOperand, unwrapChild, wrapChild`

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

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

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

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

- - ### Field Detail

    - #### value

          protected Object value

  - ### Constructor Detail

    - #### ASTScalar

          public ASTScalar()

    - #### ASTScalar

          public ASTScalar(Object value)

  - ### Method Detail

    - #### evaluateNode

          protected Object evaluateNode(Object o)
                                 throws Exception

      Description copied from class: `SimpleNode`
      Evaluates itself with object, pushing result on the stack.
      Specified by:
        `evaluateNode` in class `SimpleNode`
      Throws:
        `Exception`

    - #### shallowCopy

          public Expression shallowCopy()

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

    - #### encodeAsString

          public void encodeAsString(PrintWriter pw)

      Description copied from class: `Expression`
      Stores a String representation of Expression using a provided PrintWriter.
      Overrides:
        `encodeAsString` in class `SimpleNode`

    - #### encodeAsEJBQL

          public void encodeAsEJBQL(PrintWriter pw,
                                    String rootId)

      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.
      Overrides:
        `encodeAsEJBQL` in class `SimpleNode`
      Since:
        3.0

    - #### setValue

          public void setValue(Object value)

    - #### getValue

          public Object getValue()

    - #### getExpressionOperator

          protected String getExpressionOperator(int index)

      Specified by:
        `getExpressionOperator` in class `SimpleNode`

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