@SuppressWarnings("unchecked")
public RuleConditionElement build(final RuleBuildContext context,
final BaseDescr descr,
final Pattern prefixPattern) {
try {
final AccumulateDescr accumDescr = (AccumulateDescr) descr;
if ( !accumDescr.hasValidInput() ) {
return null;
}
final RuleConditionBuilder builder = (RuleConditionBuilder) context.getDialect().getBuilder( accumDescr.getInput().getClass() );
Declaration[] previousDeclarations = (Declaration[]) context.getDeclarationResolver().getDeclarations( context.getRule() ).values().toArray( new Declaration[context.getDeclarationResolver().getDeclarations( context.getRule() ).size()] );
// create source CE
final RuleConditionElement source = builder.build( context,
accumDescr.getInput() );
if ( source == null ) {
return null;
}
MVELDialect dialect = (MVELDialect) context.getDialect();
final Declaration[] sourceDeclArr = (Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] );
Accumulator accumulator = null;
Declaration[] declarations = null;
if ( accumDescr.isExternalFunction() ) {
// build an external function executor
AccumulateFunction function = context.getConfiguration().getAccumulateFunction( accumDescr.getFunctionIdentifier() );
if( function == null ) {
context.getErrors().add( new DescrBuildError( accumDescr,
context.getRuleDescr(),
null,
"Unknown accumulate function: '"+accumDescr.getFunctionIdentifier()+"' on rule '"+context.getRuleDescr().getName()+"'. All accumulate functions must be registered before building a resource." ) );
return null;
}
Map<String, Class< ? >> declarationsMap = context.getDeclarationResolver().getDeclarationClasses( context.getRule() );
final Dialect.AnalysisResult analysis = dialect.analyzeExpression( context,
accumDescr,
accumDescr.getExpression(),
new Map[]{declarationsMap, context.getPackageBuilder().getGlobals()} );
MVELCompilationUnit unit = dialect.getMVELCompilationUnit( (String) accumDescr.getExpression(),
analysis,
previousDeclarations,
(Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] ),
null,
context );
accumulator = new MVELAccumulatorFunctionExecutor( unit,
function );
} else {
// it is a custom accumulate
Map<String, Class< ? >> declarationsMap = context.getDeclarationResolver().getDeclarationClasses( context.getRule() );
final MVELAnalysisResult initCodeAnalysis = (MVELAnalysisResult) dialect.analyzeBlock( context,
accumDescr,
accumDescr.getInitCode(),
new Map[]{declarationsMap, context.getPackageBuilder().getGlobals()} );
final MVELAnalysisResult actionCodeAnalysis = (MVELAnalysisResult) dialect.analyzeBlock( context,
accumDescr,
null,
accumDescr.getActionCode(),
new Map[]{declarationsMap, context.getPackageBuilder().getGlobals()},
initCodeAnalysis.getMvelVariables() );
final MVELAnalysisResult resultCodeAnalysis = (MVELAnalysisResult) dialect.analyzeExpression( context,
accumDescr,
accumDescr.getResultCode(),
new Map[]{declarationsMap, context.getPackageBuilder().getGlobals()},
initCodeAnalysis.getMvelVariables() );
Dialect.AnalysisResult reverseCodeAnalysis = null;
if ( accumDescr.getReverseCode() != null ) {
reverseCodeAnalysis = dialect.analyzeBlock( context,
accumDescr,
null,
accumDescr.getActionCode(),
new Map[]{declarationsMap, context.getPackageBuilder().getGlobals()},
initCodeAnalysis.getMvelVariables() );
}
MVELCompilationUnit initUnit = dialect.getMVELCompilationUnit( (String) accumDescr.getInitCode(),
initCodeAnalysis,
previousDeclarations,
(Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] ),
null,
context );
MVELCompilationUnit actionUnit = dialect.getMVELCompilationUnit( (String) accumDescr.getActionCode(),
actionCodeAnalysis,
previousDeclarations,
(Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] ),
initCodeAnalysis.getMvelVariables(),
context );
MVELCompilationUnit reverseUnit = null;
if ( accumDescr.getReverseCode() != null ) {
reverseUnit = dialect.getMVELCompilationUnit( (String) accumDescr.getReverseCode(),
reverseCodeAnalysis,
previousDeclarations,
(Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] ),
initCodeAnalysis.getMvelVariables(),
context );
}
MVELCompilationUnit resultUnit = dialect.getMVELCompilationUnit( (String) accumDescr.getResultCode(),
resultCodeAnalysis,
previousDeclarations,
(Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] ),
initCodeAnalysis.getMvelVariables(),
context );