Package org.apache.cayenne.exp.parser

Class ASTDbPath

java.lang.Object

org.apache.cayenne.exp.Expression

org.apache.cayenne.exp.parser.SimpleNode

org.apache.cayenne.exp.parser.ASTPath

org.apache.cayenne.exp.parser.ASTDbPath

All Implemented Interfaces:

Serializable, Node, XMLSerializable

Direct Known Subclasses:

ASTDbIdPath

public class ASTDbPath
extends ASTPath

Path expression traversing DB relationships and attributes.

Since:

1.1

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DB_PREFIX

Fields inherited from class org.apache.cayenne.exp.parser.ASTPath

path, 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, 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
ASTDbPath()
ASTDbPath(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.
protected CayenneMapEntry	evaluateEntityNode(Entity entity)	Helper method to evaluate path expression with Cayenne Entity.
protected Object	evaluateNode(Object o)	Evaluates itself with object, pushing result on the stack.
int	getType()	Returns a type of expression.
Expression	shallowCopy()	Creates a copy of this expression node, without copying children.
protected Map<?,?>	toMap(Object o)

Methods inherited from class org.apache.cayenne.exp.parser.ASTPath

getExpressionOperator, getOperand, getOperandCount, getPath, getPathAliases, hashCode, setOperand, setPath, setPathAliases

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

appendAsEJBQL, appendAsEscapedString, appendChildrenAsEJBQL, appendScalarAsString, connectChildren, encodeScalarAsEJBQL, evaluate, evaluateChild, expName, flattenTree, getEJBQLExpressionOperator, jjtAddChild, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, jjtSetParent, notExp, pruneNodeForPrunedChild, unwrapChild, wrapChild

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

andExp, andExp, deepCopy, encodeAsXML, equals, filter, filterObjects, first, 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

DB_PREFIX

public static final String DB_PREFIX

See Also:

• Constant Field Values

Constructor Details

ASTDbPath

public ASTDbPath()

ASTDbPath

public ASTDbPath(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

toMap

protected Map<?,?> toMap(Object o)

shallowCopy

public Expression shallowCopy()

Creates a copy of this expression node, without copying children.

Specified by:

shallowCopy in class Expression

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

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

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

evaluateEntityNode

protected CayenneMapEntry evaluateEntityNode(Entity entity)

Helper method to evaluate path expression with Cayenne Entity.

Overrides:

evaluateEntityNode in class ASTPath