org.apache.cayenne.exp.parser

## Class ASTPath

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

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

      public abstract class ASTPath
      extends SimpleNode

  Generic path expression.
  Since:
    1.1
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected String` | `path`
    `protected Map<String,String>` | `pathAliases`

    - ### 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`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected CayenneMapEntry` | `evaluateEntityNode(Entity entity)` Helper method to evaluate path expression with Cayenne Entity.
    `protected String` | `getExpressionOperator(int index)`
    `Object` | `getOperand(int index)` Returns a value of operand at `index`.
    `int` | `getOperandCount()` Returns a count of operands of this expression.
    `protected String` | `getPath()`
    `Map<String,String>` | `getPathAliases()` Always returns empty map.
    `void` | `setOperand(int index, Object value)` Sets a value of operand at `index`.
    `protected void` | `setPath(Object path)`
    `void` | `setPathAliases(Map<String,String> pathAliases)`

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

      `connectChildren, encodeAsEJBQL, encodeAsEscapedString, encodeAsString, encodeChildrenAsEJBQL, encodeScalarAsString, evaluate, evaluateChild, evaluateNode, expName, flattenTree, getEJBQLExpressionOperator, jjtAddChild, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, jjtSetParent, notExp, pruneNodeForPrunedChild, 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, shallowCopy, toEJBQL, toString, transform, transformExpression, traverse, traverse`

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

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

- - ### Field Detail

    - #### path

          protected String path

    - #### pathAliases

          protected Map<String,String> pathAliases

  - ### Method Detail

    - #### getOperandCount

          public int getOperandCount()

      Description copied from class: `Expression`
      Returns a count of operands of this expression. In real life there are unary (count == 1), binary (count == 2) and ternary (count == 3) expressions.
      Overrides:
        `getOperandCount` in class `SimpleNode`

    - #### getOperand

          public Object getOperand(int index)

      Description copied from class: `Expression`
      Returns a value of operand at `index`. Operand indexing starts at 0.
      Overrides:
        `getOperand` in class `SimpleNode`

    - #### setOperand

          public void setOperand(int index,
                                 Object value)

      Description copied from class: `Expression`
      Sets a value of operand at `index`. Operand indexing starts at 0.
      Overrides:
        `setOperand` in class `SimpleNode`

    - #### setPath

          protected void setPath(Object path)

    - #### getPath

          protected String getPath()

    - #### getPathAliases

          public Map<String,String> getPathAliases()

      Description copied from class: `SimpleNode`
      Always returns empty map.
      Overrides:
        `getPathAliases` in class `SimpleNode`
      Since:
        3.0

    - #### setPathAliases

          public void setPathAliases(Map<String,String> pathAliases)

      Since:
        3.0

    - #### evaluateEntityNode

          protected CayenneMapEntry evaluateEntityNode(Entity entity)

      Helper method to evaluate path expression with Cayenne Entity.

    - #### getExpressionOperator

          protected String getExpressionOperator(int index)

      Specified by:
        `getExpressionOperator` in class `SimpleNode`

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