Package 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:

ASTEnum, 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	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, 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

Constructor Summary

Constructors

Constructor	Description
ASTScalar()
ASTScalar(Object value)

Method Summary

Modifier and Type	Method	Description
void	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.
boolean	equals(Object o)
protected Object	evaluateNode(Object o)	Evaluates itself with object, pushing result on the stack.
protected String	getExpressionOperator(int index)
Object	getValue()
int	hashCode()
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

appendAsEJBQL, appendAsEscapedString, appendChildrenAsEJBQL, appendScalarAsString, connectChildren, encodeScalarAsEJBQL, 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, andExp, deepCopy, encodeAsXML, filter, filterObjects, first, getType, joinExp, joinExp, match, orExp, orExp, params, params, paramsArray, setType, toEJBQL, toEJBQL, toString, transform, transformExpression, traverse, traverse

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

value

protected Object value

Constructor Details

ASTScalar

public ASTScalar()

ASTScalar

public ASTScalar(Object value)

Method Details

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

appendAsString

public void appendAsString(Appendable out)
                    throws IOException

Description copied from class: Expression

Appends own content as a String to the provided Appendable.

Overrides:

appendAsString in class SimpleNode

Throws:

IOException

Since:

4.0

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 class SimpleNode

Throws:

IOException

Since:

4.0

setValue

public void setValue(Object value)

getValue

public Object getValue()

getExpressionOperator

protected String getExpressionOperator(int index)

Specified by:

getExpressionOperator in class SimpleNode

equals

public boolean equals(Object o)

Overrides:

equals in class Expression

hashCode

public int hashCode()

Overrides:

hashCode in class Expression