org.apache.cayenne.exp.parser
Class ASTTrue
java.lang.Object
org.apache.cayenne.exp.Expression
org.apache.cayenne.exp.parser.SimpleNode
org.apache.cayenne.exp.parser.ConditionNode
org.apache.cayenne.exp.parser.ASTTrue
- All Implemented Interfaces:
- java.io.Serializable, Node, XMLSerializable
public class ASTTrue
- extends ConditionNode
Boolean true expression element Notice that there is one ASTTrue and one ASTFalse
instead of a ASTBoolean with a Boolean value. The main reason for doing this is that a
common ASTBoolean will have operand count of 1 and that will default to a prepared
statmenet like " where ? and (...)", but we only need " where true and (...)".
- Since:
- 3.0
- See Also:
ASTFalse
,
Serialized Form
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 |
void |
encodeAsEJBQL(java.io.PrintWriter pw,
java.lang.String rootId)
Stores a String representation of Expression as EJBQL using a provided PrintWriter. |
void |
encodeAsString(java.io.PrintWriter pw)
Stores a String representation of Expression using a provided PrintWriter. |
protected java.lang.Object |
evaluateNode(java.lang.Object o)
Evaluates itself with object, pushing result on the stack. |
protected java.lang.String |
getExpressionOperator(int index)
|
int |
getType()
Returns a type of expression. |
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, notExp, pruneNodeForPrunedChild, setOperand, unwrapChild, wrapChild |
Methods inherited from class org.apache.cayenne.exp.Expression |
andExp, deepCopy, encodeAsXML, equals, expWithParameters, expWithParameters, filter, filterObjects, first, fromString, 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 |
ASTTrue
public ASTTrue()
evaluateNode
protected java.lang.Object evaluateNode(java.lang.Object o)
throws java.lang.Exception
- Description copied from class:
SimpleNode
- Evaluates itself with object, pushing result on the stack.
- Specified by:
evaluateNode
in class SimpleNode
- Throws:
java.lang.Exception
getExpressionOperator
protected java.lang.String getExpressionOperator(int index)
- Specified by:
getExpressionOperator
in class SimpleNode
shallowCopy
public Expression shallowCopy()
- Description copied from class:
Expression
- Creates a copy of this expression node, without copying children.
- Specified by:
shallowCopy
in class Expression
getType
public int getType()
- Description copied from class:
Expression
- Returns a type of expression. Most common types are defined as public static fields
of this interface.
- Overrides:
getType
in class Expression
encodeAsString
public void encodeAsString(java.io.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(java.io.PrintWriter pw,
java.lang.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
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