Cumulus4j API
(1.2.0)

org.cumulus4j.store.query.eval
Class ComparisonExpressionEvaluator

java.lang.Object
  extended by org.cumulus4j.store.query.eval.AbstractExpressionEvaluator<DyadicExpression>
      extended by org.cumulus4j.store.query.eval.ComparisonExpressionEvaluator

public class ComparisonExpressionEvaluator
extends AbstractExpressionEvaluator<DyadicExpression>

Evaluator handling the comparisons ==, <, <=, >, >=.

Author:
Marco หงุ่ยตระกูล-Schulze - marco at nightlabs dot de

Constructor Summary
ComparisonExpressionEvaluator(QueryEvaluator queryEvaluator, AbstractExpressionEvaluator<?> parent, DyadicExpression expression)
           
 
Method Summary
protected  Set<Long> _queryResultDataEntryIDs(ResultDescriptor resultDescriptor)
          Execute a query for the given resultDescriptor.
protected  Object getLeftCompareToArgument()
           
protected  Object getRightCompareToArgument()
           
 
Methods inherited from class org.cumulus4j.store.query.eval.AbstractExpressionEvaluator
_getResultSymbols, _queryResultObjects, getExpression, getFieldType, getLeft, getParent, getQueryEvaluator, getResultSymbols, getRight, queryResultDataEntryIDs, queryResultObjects, setLeft, setRight
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ComparisonExpressionEvaluator

public ComparisonExpressionEvaluator(QueryEvaluator queryEvaluator,
                                     AbstractExpressionEvaluator<?> parent,
                                     DyadicExpression expression)
Method Detail

_queryResultDataEntryIDs

protected Set<Long> _queryResultDataEntryIDs(ResultDescriptor resultDescriptor)
Description copied from class: AbstractExpressionEvaluator
Execute a query for the given resultDescriptor. This method should contain the concrete logic for AbstractExpressionEvaluator.queryResultDataEntryIDs(ResultDescriptor) and must be implemented by subclasses.

Specified by:
_queryResultDataEntryIDs in class AbstractExpressionEvaluator<DyadicExpression>
Parameters:
resultDescriptor - the descriptor specifying what candidates (usually "this" or a variable) the caller is interested in as well as modifiers (e.g. negation) affecting the query.
Returns:
those dataEntryIDs that match the query criteria for the specified resultSymbol or null, if the symbol is not supported (this should be consistent with the implementation of AbstractExpressionEvaluator._getResultSymbols()).
See Also:
AbstractExpressionEvaluator.queryResultDataEntryIDs(ResultDescriptor)

getLeftCompareToArgument

protected Object getLeftCompareToArgument()

getRightCompareToArgument

protected Object getRightCompareToArgument()

Cumulus4j API
(1.2.0)

Copyright © 2013 NightLabs Consulting GmbH. All Rights Reserved.