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com.presumo.jms.selector
Class JmsOperand
java.lang.Objectcom.presumo.jms.selector.JmsOperand
- Direct Known Subclasses:
- JmsBinaryOperand, JmsDataType, JmsIdentifier, JmsIs, JmsNot
- public abstract class JmsOperand
- extends java.lang.Object
Base class for all nodes in the JMS parse tree. All functionality is
package protected, and calling code should use the access point
represented by Parser.
| Field Summary | |
private static java.util.ArrayList |
allInstances
|
protected static short |
evalNumber
|
(package private) static short |
JMS_BINARY_ADD
|
(package private) static short |
JMS_BINARY_AND
|
(package private) static short |
JMS_BINARY_DIV
|
(package private) static short |
JMS_BINARY_MULT
|
(package private) static short |
JMS_BINARY_OR
|
(package private) static short |
JMS_BINARY_SUB
|
(package private) static short |
JMS_BOOLEAN_LITERAL
|
(package private) static short |
JMS_EQUALS
|
(package private) static short |
JMS_FLOAT_LITERAL
|
(package private) static short |
JMS_GREATER
|
(package private) static short |
JMS_IDENTIFIER
|
(package private) static short |
JMS_INTEGER_LITERAL
|
(package private) static short |
JMS_IS
|
(package private) static short |
JMS_LESS
|
(package private) static short |
JMS_LIKE
|
(package private) static short |
JMS_NOT
|
(package private) static short |
JMS_STRING_LITERAL
|
protected JmsOperand |
lastEval
|
protected short |
myEvalNumber
|
protected java.util.Hashtable |
parents
keeps track of what children belong to which parent. |
protected int |
refcount
|
private boolean |
tracked
|
| Constructor Summary | |
protected |
JmsOperand()
All subclasses of JmsOperand will be a modified version of a singleton which only allows one instance for every logical expression within the JVM. |
protected |
JmsOperand(boolean tracked)
JmsOperands that represent data types have constant evaluation times and don't need to be tracked for the reset functionality. |
| Method Summary | |
protected void |
addParent(JmsOperand parent)
|
protected void |
addParentRef(JmsOperand parent)
|
protected java.util.Enumeration |
allParents()
Returns an enumeration of all nodes that point to this instance as a child. |
(package private) void |
delete()
Because of the singleton optimizations, code using this parser has to manually free up parse trees. |
protected void |
delete(JmsOperand fromParent)
|
(package private) abstract JmsOperand |
evaluate(javax.jms.Message msg)
Evaluates the expression tree represented by this node. |
(package private) JmsOperand |
evaluateOnce(javax.jms.Message msg)
Method used to evaluate all logically equivelant espressions within a JVM only once. |
(package private) static java.util.ArrayList |
getAllInstances()
|
(package private) abstract short |
getType()
|
protected boolean |
hasParent(JmsOperand parent)
|
(package private) void |
incrementAllRefCounts()
Increments all reference counts in this tree |
(package private) void |
incrementRefCount()
|
protected int |
numberOfParents()
|
(package private) void |
printTree(int level)
|
protected void |
removeParent(JmsOperand parent)
|
(package private) static void |
resetStoredEvals()
|
(package private) abstract java.lang.String |
unParse()
Returns a String representing the SQL form of the filter which is logically equivilant. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
evalNumber
protected static short evalNumber
myEvalNumber
protected short myEvalNumber
lastEval
protected JmsOperand lastEval
tracked
private final boolean tracked
refcount
protected int refcount
parents
protected java.util.Hashtable parents
- keeps track of what children belong to which parent.
allInstances
private static java.util.ArrayList allInstances
JMS_EQUALS
static final short JMS_EQUALS
- See Also:
- Constant Field Values
JMS_INTEGER_LITERAL
static final short JMS_INTEGER_LITERAL
- See Also:
- Constant Field Values
JMS_IDENTIFIER
static final short JMS_IDENTIFIER
- See Also:
- Constant Field Values
JMS_BOOLEAN_LITERAL
static final short JMS_BOOLEAN_LITERAL
- See Also:
- Constant Field Values
JMS_STRING_LITERAL
static final short JMS_STRING_LITERAL
- See Also:
- Constant Field Values
JMS_FLOAT_LITERAL
static final short JMS_FLOAT_LITERAL
- See Also:
- Constant Field Values
JMS_LESS
static final short JMS_LESS
- See Also:
- Constant Field Values
JMS_GREATER
static final short JMS_GREATER
- See Also:
- Constant Field Values
JMS_NOT
static final short JMS_NOT
- See Also:
- Constant Field Values
JMS_BINARY_OR
static final short JMS_BINARY_OR
- See Also:
- Constant Field Values
JMS_BINARY_AND
static final short JMS_BINARY_AND
- See Also:
- Constant Field Values
JMS_IS
static final short JMS_IS
- See Also:
- Constant Field Values
JMS_BINARY_MULT
static final short JMS_BINARY_MULT
- See Also:
- Constant Field Values
JMS_BINARY_DIV
static final short JMS_BINARY_DIV
- See Also:
- Constant Field Values
JMS_BINARY_ADD
static final short JMS_BINARY_ADD
- See Also:
- Constant Field Values
JMS_BINARY_SUB
static final short JMS_BINARY_SUB
- See Also:
- Constant Field Values
JMS_LIKE
static final short JMS_LIKE
- See Also:
- Constant Field Values
| Constructor Detail |
JmsOperand
protected JmsOperand()
- All subclasses of JmsOperand will be a modified version of a singleton
which only allows one instance for every logical expression within
the JVM.
JmsOperand
protected JmsOperand(boolean tracked)
- JmsOperands that represent data types have constant evaluation times
and don't need to be tracked for the reset functionality. This makes
the reset functionality more effecient. Furthermore, JmsDataType(s)
can be created during the evaulation phase (i.e. through an identifier)
If these instances were tracked there would be a memory leak.
| Method Detail |
getAllInstances
static java.util.ArrayList getAllInstances()
resetStoredEvals
static final void resetStoredEvals()
incrementRefCount
void incrementRefCount()
incrementAllRefCounts
void incrementAllRefCounts()
- Increments all reference counts in this tree
allParents
protected final java.util.Enumeration allParents()
- Returns an enumeration of all nodes that point to this instance
as a child.
numberOfParents
protected final int numberOfParents()
hasParent
protected final boolean hasParent(JmsOperand parent)
addParent
protected final void addParent(JmsOperand parent)
addParentRef
protected final void addParentRef(JmsOperand parent)
removeParent
protected final void removeParent(JmsOperand parent)
evaluate
abstract JmsOperand evaluate(javax.jms.Message msg) throws SelectorFalseException
- Evaluates the expression tree represented by this node.
evaluateOnce
JmsOperand evaluateOnce(javax.jms.Message msg) throws SelectorFalseException
- Method used to evaluate all logically equivelant espressions within
a JVM only once.
unParse
abstract java.lang.String unParse()
- Returns a String representing the SQL form of the filter which is logically
equivilant.
delete
void delete()
- Because of the singleton optimizations, code using this parser has to manually
free up parse trees. This operation should only be called on the root node
of a parse tree.
delete
protected void delete(JmsOperand fromParent)
printTree
void printTree(int level)
getType
abstract short getType()
|
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SUMMARY: JAVADOC | SOURCE | DOWNLOAD | NESTED | FIELD | CONSTR | METHOD |
DETAIL: FIELD | CONSTR | METHOD | ||||||||