org.cumulus4j.store.query.eval
Class ExpressionHelper

java.lang.Object
  org.cumulus4j.store.query.eval.ExpressionHelper

public class ExpressionHelper
extends Object

Series of helper methods for processing expressions.

Nested Class Summary

static class	ExpressionHelper.ContainsConstantResolver Resolve Collection.contains(Object) with the argument being a concrete value (a 'constant').
static class	ExpressionHelper.ContainsVariableResolver Resolve Collection.contains(Object) with the argument being a query variable.

Constructor Summary

ExpressionHelper()

Method Summary

static MethodEvaluator	createMethodEvaluatorForMethodOfClass(StoreManager storeMgr, ClassLoaderResolver clr, String clsName, String method) Accessor for the evaluator object for use of method xxx(...) of class Yyy in queries.
static Object	getEvaluatedInvokeArgument(QueryEvaluator queryEval, InvokeExpression expr) Method to evaluate the argument for passing in to a method invocation.
static Object[]	getEvaluatedInvokeArguments(QueryEvaluator queryEval, InvokeExpression expr) Method to evaluate the arguments for passing in to a method invocation.
static String	getOperatorAsJDOQLSymbol(Expression.Operator operator, boolean negate)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExpressionHelper

public ExpressionHelper()

Method Detail

createMethodEvaluatorForMethodOfClass

public static MethodEvaluator createMethodEvaluatorForMethodOfClass(StoreManager storeMgr,
                                                                    ClassLoaderResolver clr,
                                                                    String clsName,
                                                                    String method)

Accessor for the evaluator object for use of method xxx(...) of class Yyy in queries.

Parameters:

storeMgr - Store Manager

clr - ClassLoader resolver

clsName - The class on which to invoke the method

method - The method to call on the class

Returns:

The MethodEvaluator

getEvaluatedInvokeArguments

public static Object[] getEvaluatedInvokeArguments(QueryEvaluator queryEval,
                                                   InvokeExpression expr)

Method to evaluate the arguments for passing in to a method invocation.

Parameters:

queryEval - The QueryEvaluator

expr - The invoke expression

Returns:

The argument(s)

getEvaluatedInvokeArgument

public static Object getEvaluatedInvokeArgument(QueryEvaluator queryEval,
                                                InvokeExpression expr)

Method to evaluate the argument for passing in to a method invocation.

Parameters:

queryEval - The QueryEvaluator

expr - The invoke expression

Returns:

The argument

getOperatorAsJDOQLSymbol

public static String getOperatorAsJDOQLSymbol(Expression.Operator operator,
                                              boolean negate)