public RuleConditionElement build(
final RuleBuildContext context, final BaseDescr descr, final Pattern prefixPattern) {
final AccumulateDescr accumDescr = (AccumulateDescr) descr;
if (!accumDescr.hasValidInput()) {
return null;
}
final RuleConditionBuilder builder =
context.getDialect().getBuilder(accumDescr.getInput().getClass());
// 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[0]);
Accumulator accumulator = null;
Declaration[] declarations = null;
if (accumDescr.isExternalFunction()) {
// build an external function executor
final Dialect.AnalysisResult analysis =
dialect.analyzeExpression(
context,
accumDescr,
accumDescr.getExpression(),
new Set[] {
context.getDeclarationResolver().getDeclarations().keySet(),
context.getPkg().getGlobals().keySet()
});
int size = analysis.getBoundIdentifiers()[0].size();
declarations = new Declaration[size];
for (int i = 0; i < size; i++) {
declarations[i] =
context
.getDeclarationResolver()
.getDeclaration((String) analysis.getBoundIdentifiers()[0].get(i));
}
final Serializable expression =
dialect.compile(
(String) accumDescr.getExpression(),
analysis,
null,
source.getOuterDeclarations(),
null,
context);
AccumulateFunction function =
context.getConfiguration().getAccumulateFunction(accumDescr.getFunctionIdentifier());
final DroolsMVELFactory factory =
new DroolsMVELFactory(
context.getDeclarationResolver().getDeclarations(),
source.getOuterDeclarations(),
context.getPkg().getGlobals());
MVELDialectRuntimeData data =
(MVELDialectRuntimeData)
context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
factory.setNextFactory(data.getFunctionFactory());
accumulator = new MVELAccumulatorFunctionExecutor(factory, expression, function);
} else {
// it is a custom accumulate
final MVELAnalysisResult initCodeAnalysis =
(MVELAnalysisResult)
dialect.analyzeBlock(
context,
accumDescr,
accumDescr.getInitCode(),
new Set[] {
context.getDeclarationResolver().getDeclarations().keySet(),
context.getPkg().getGlobals().keySet()
});
final MVELAnalysisResult actionCodeAnalysis =
(MVELAnalysisResult)
dialect.analyzeBlock(
context,
accumDescr,
null,
accumDescr.getActionCode(),
new Set[] {
context.getDeclarationResolver().getDeclarations().keySet(),
context.getPkg().getGlobals().keySet()
},
initCodeAnalysis.getMvelVariables());
// actionCodeAnalysis.setMvelVariables( initCodeAnalysis.getMvelVariables() );
final MVELAnalysisResult resultCodeAnalysis =
(MVELAnalysisResult)
dialect.analyzeExpression(
context,
accumDescr,
accumDescr.getResultCode(),
new Set[] {
context.getDeclarationResolver().getDeclarations().keySet(),
context.getPkg().getGlobals().keySet()
},
initCodeAnalysis.getMvelVariables());
// resultCodeAnalysis.setMvelVariables( initCodeAnalysis.getMvelVariables() );
final List requiredDeclarations = new ArrayList(initCodeAnalysis.getBoundIdentifiers()[0]);
requiredDeclarations.addAll(actionCodeAnalysis.getBoundIdentifiers()[0]);
requiredDeclarations.addAll(resultCodeAnalysis.getBoundIdentifiers()[0]);
Dialect.AnalysisResult reverseCodeAnalysis = null;
if (accumDescr.getReverseCode() != null) {
reverseCodeAnalysis =
context
.getDialect()
.analyzeBlock(
context,
accumDescr,
accumDescr.getActionCode(),
new Set[] {
context.getDeclarationResolver().getDeclarations().keySet(),
context.getPkg().getGlobals().keySet()
});
requiredDeclarations.addAll(reverseCodeAnalysis.getBoundIdentifiers()[0]);
}
declarations = new Declaration[requiredDeclarations.size()];
for (int i = 0, size = requiredDeclarations.size(); i < size; i++) {
declarations[i] =
context.getDeclarationResolver().getDeclaration((String) requiredDeclarations.get(i));
}
final Serializable init =
dialect.compile(
(String) accumDescr.getInitCode(),
initCodeAnalysis,
null,
source.getOuterDeclarations(),
null,
context);
final Serializable action =
dialect.compile(
(String) accumDescr.getActionCode(),
actionCodeAnalysis,
null,
source.getOuterDeclarations(),
initCodeAnalysis.getMvelVariables(),
context);
Serializable reverse = null;
if (accumDescr.getReverseCode() != null) {
reverse =
dialect.compile(
(String) accumDescr.getReverseCode(),
resultCodeAnalysis,
null,
source.getOuterDeclarations(),
initCodeAnalysis.getMvelVariables(),
context);
}
final Serializable result =
dialect.compile(
(String) accumDescr.getResultCode(),
resultCodeAnalysis,
null,
source.getOuterDeclarations(),
initCodeAnalysis.getMvelVariables(),
context);
DroolsMVELFactory factory = null;
if (reverse == null) {
// does not support reverse, so create a regular factory
factory =
new DroolsMVELFactory(
context.getDeclarationResolver().getDeclarations(),
source.getOuterDeclarations(),
context.getPkg().getGlobals());
} else {
Set<String> shadow = new HashSet<String>(source.getOuterDeclarations().keySet());
shadow.retainAll(reverseCodeAnalysis.getNotBoundedIdentifiers());
shadow.addAll(reverseCodeAnalysis.getBoundIdentifiers()[0]);
// supports reverse, so create a shadowing factory
factory =
new DroolsMVELShadowFactory(
context.getDeclarationResolver().getDeclarations(),
source.getOuterDeclarations(),
context.getPkg().getGlobals(),
shadow);
}
MVELDialectRuntimeData data =
(MVELDialectRuntimeData)
context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
factory.setNextFactory(data.getFunctionFactory());
accumulator = new MVELAccumulator(factory, init, action, reverse, result);
}
final Accumulate accumulate = new Accumulate(source, declarations, sourceDeclArr, accumulator);
return accumulate;
}
@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);
if (reverseUnit != null) {
Set<String> shadow = new HashSet<String>(source.getOuterDeclarations().keySet());
shadow.retainAll(reverseCodeAnalysis.getNotBoundedIdentifiers());
shadow.addAll(reverseCodeAnalysis.getBoundIdentifiers()[0]);
String[] shadowVars = (String[]) shadow.toArray(new String[shadow.size()]);
actionUnit.setShadowIdentifiers(shadowVars);
reverseUnit.setShadowIdentifiers(shadowVars);
}
accumulator = new MVELAccumulator(initUnit, actionUnit, reverseUnit, resultUnit);
}
final Accumulate accumulate =
new Accumulate(source, declarations, sourceDeclArr, new Accumulator[] {accumulator});
MVELDialectRuntimeData data =
(MVELDialectRuntimeData)
context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
data.addCompileable(accumulate, (MVELCompileable) accumulator);
((MVELCompileable) accumulator).compile(context.getPackageBuilder().getRootClassLoader());
return accumulate;
} catch (Exception e) {
context
.getErrors()
.add(
new DescrBuildError(
context.getParentDescr(),
descr,
e,
"Unable to build expression for 'accumulate' : " + e.getMessage()));
return null;
}
}