org.datanucleus.store.mapped.expression
Class MapKeyLiteral

java.lang.Object
  extended by org.datanucleus.store.mapped.expression.ScalarExpression
      extended by org.datanucleus.store.mapped.expression.MapKeyLiteral

public class MapKeyLiteral
extends ScalarExpression

An SQL expression that will test if a column of a table falls within the given Map's keys. This is used for Querys where a transient Map is passed in as a parameter.


Nested Class Summary
 
Nested classes/interfaces inherited from class org.datanucleus.store.mapped.expression.ScalarExpression
ScalarExpression.DatastoreFieldExpression, ScalarExpression.DyadicOperator, ScalarExpression.ExpressionList, ScalarExpression.IllegalArgumentTypeException, ScalarExpression.IllegalOperationException, ScalarExpression.MethodInvocationException, ScalarExpression.MonadicOperator, ScalarExpression.Operator
 
Field Summary
 
Fields inherited from class org.datanucleus.store.mapped.expression.ScalarExpression
aliasIdentifier, checkForTypeAssignability, expressionList, FILTER, LOCALISER, lowestOperator, mapping, OP_ADD, OP_AND, OP_BETWEEN, OP_COM, OP_CONCAT, OP_DIV, OP_EQ, OP_GT, OP_GTEQ, OP_IN, OP_IS, OP_ISNOT, OP_LIKE, OP_LT, OP_LTEQ, OP_MOD, OP_MUL, OP_NEG, OP_NOT, OP_NOTEQ, OP_NOTIN, OP_NOTLIKE, OP_OR, OP_SUB, parameterName, PROJECTION, qs, st, te
 
Constructor Summary
MapKeyLiteral(QueryExpression qs, JavaTypeMapping mapping, java.util.Map map)
          Constructor.
 
Method Summary
 BooleanExpression containsMethod(ScalarExpression expr)
          Method to check the containing of a key in the Map.
 ScalarExpression getMethod(ScalarExpression expr)
          Method to get a value from the Map for a key
 BooleanExpression isEmptyMethod()
          Method to check for emptiness of the collection.
 
Methods inherited from class org.datanucleus.store.mapped.expression.ScalarExpression
accessField, add, and, as, assertValidTypeForParameterComparison, callMethod, cast, checkForTypeAssignability, com, div, encloseWithInParentheses, eor, eq, equals, getAlias, getConsistentTypeForParameterComparison, getExpressionList, getLogicSetExpression, getMapping, getNonAliasExpression, getQueryExpression, gt, gteq, in, instanceOf, ior, lt, lteq, mod, mul, neg, not, noteq, setParameterName, sub, toStatementText, toString
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

MapKeyLiteral

public MapKeyLiteral(QueryExpression qs,
                     JavaTypeMapping mapping,
                     java.util.Map map)
Constructor.

Parameters:
qs - The QueryStatement the MapKeyLiteral will be used in.
mapping - The mapping for the Map
map - The transient Map that is the value.
Method Detail

containsMethod

public BooleanExpression containsMethod(ScalarExpression expr)
Method to check the containing of a key in the Map. Return the BooleanExpression that results from MapKeyLiteral.contains(SQLExpression).

Parameters:
expr - The SQLExpression that is checked for membership in the Map.
Returns:
The BooleanExpression that results from MapKeyLiteral.contains(SQLExpression).

getMethod

public ScalarExpression getMethod(ScalarExpression expr)
Method to get a value from the Map for a key

Parameters:
expr - The key argument expression
Returns:
The statement

isEmptyMethod

public BooleanExpression isEmptyMethod()
Method to check for emptiness of the collection.

Returns:
The BooleanExpression.


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