Package org.apache.cayenne.exp.parser
Class ASTFalse
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.ASTFalse
- All Implemented Interfaces:
Serializable
,Node
,XMLSerializable
Boolean false 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
statement like " where ? and (...)", but we only need " where true and
(...)".
- Since:
- 3.0
- See Also:
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Field Summary
Fields inherited from class org.apache.cayenne.exp.parser.SimpleNode
children, id, parent
Fields inherited from class org.apache.cayenne.exp.Expression
ADD, AND, ASTERISK, BETWEEN, BITWISE_AND, BITWISE_LEFT_SHIFT, BITWISE_NOT, BITWISE_OR, BITWISE_RIGHT_SHIFT, BITWISE_XOR, CUSTOM_OP, DB_PATH, DBID_PATH, DIVIDE, ENCLOSING_OBJECT, EQUAL_TO, EXISTS, FALSE, FULL_OBJECT, FUNCTION_CALL, 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_EXISTS, NOT_IN, NOT_LIKE, NOT_LIKE_IGNORE_CASE, OBJ_PATH, OR, PRUNED_NODE, SUBQUERY, SUBTRACT, TRUE, type
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
appendAsEJBQL
(List<Object> parameterAccumulator, Appendable out, String rootId) Stores a String representation of Expression as EJBQL using a provided PrintWriter.void
appendAsString
(Appendable out) Appends own content as a String to the provided Appendable.protected Boolean
evaluateSubNode
(Object o, Object[] evaluatedChildren) protected String
getExpressionOperator
(int index) protected int
int
getType()
Returns a type of expression.Creates a copy of this expression node, without copying children.Methods inherited from class org.apache.cayenne.exp.parser.ConditionNode
evaluateNode, jjtSetParent
Methods inherited from class org.apache.cayenne.exp.parser.SimpleNode
appendAsEJBQL, appendAsEscapedString, appendChildrenAsEJBQL, appendScalarAsString, connectChildren, encodeScalarAsEJBQL, 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, andExp, deepCopy, encodeAsXML, equals, filter, filterObjects, first, hashCode, joinExp, joinExp, match, orExp, orExp, params, params, paramsArray, setType, toEJBQL, toEJBQL, toString, transform, transformExpression, traverse, traverse
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Constructor Details
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ASTFalse
public ASTFalse()
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Method Details
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getRequiredChildrenCount
protected int getRequiredChildrenCount()- Specified by:
getRequiredChildrenCount
in classConditionNode
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evaluateSubNode
- Specified by:
evaluateSubNode
in classConditionNode
- Throws:
Exception
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getExpressionOperator
- Specified by:
getExpressionOperator
in classSimpleNode
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shallowCopy
Description copied from class:Expression
Creates a copy of this expression node, without copying children.- Specified by:
shallowCopy
in classExpression
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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 classExpression
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appendAsString
Description copied from class:Expression
Appends own content as a String to the provided Appendable.- Overrides:
appendAsString
in classSimpleNode
- Throws:
IOException
- Since:
- 4.0
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appendAsEJBQL
public void appendAsEJBQL(List<Object> parameterAccumulator, Appendable out, String rootId) throws IOException 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. If the parameterAccumulator is supplied then as the EJBQL is output, it may load parameters into this list. In this case, the EJBQL output will contain reference to positional parameters. If no parameterAccumulator is supplied and a scalar type is encountered for which there is no EJBQL literal representation (such as dates) then this method will throw a runtime exception to indicate that it was not possible to generate a string-only representation of the Expression in EJBQL.- Overrides:
appendAsEJBQL
in classSimpleNode
- Throws:
IOException
- Since:
- 4.0
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