Package org.drools.compiler

Examples of org.drools.compiler.DescrBuildError

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                                                                                                              ((ClassObjectType) objectType).getClassType() ) );

                if ( analysis == null ) {
                    // something bad happened
                    if ( reportError ) {
                        context.addError(new DescrBuildError(context.getParentDescr(),
                                descr,
                                null,
                                "Unable to analyze expression '" + fieldName + "'"));
                    }
                    return null;
                }

                final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();

                if ( !usedIdentifiers.getDeclrClasses().isEmpty() ) {
                    if ( reportError && descr instanceof BindingDescr ) {
                        context.addError(new DescrBuildError(context.getParentDescr(),
                                descr,
                                null,
                                "Variables can not be used inside bindings. Variable " + usedIdentifiers.getDeclrClasses().keySet() + " is being used in binding '" + fieldName + "'"));
                    }
                    return null;
                }

                reader = context.getPkg().getClassFieldAccessorStore().getMVELReader( context.getPkg().getName(),
                                                                                      ((ClassObjectType) objectType).getClassName(),
                                                                                      fieldName,
                                                                                      context.isTypesafe(),
                                                                                      ((MVELAnalysisResult)analysis).getReturnType() );
               
                MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
                ((MVELCompileable) reader).compile( data );
                data.addCompileable( (MVELCompileable) reader );
            } catch ( final Exception e ) {
                if ( reportError ) {
                    copyErrorLocation( e,
                                       descr );
                    context.addError(new DescrBuildError(context.getParentDescr(),
                            descr,
                            e,
                            "Unable to create reader for '" + fieldName + "':" + e.getMessage()));
                }
                // if there was an error, set the reader back to null
                reader = null;
            } finally {
                context.setDialect( dialect );
            }
        } else {
            boolean alternatives = false;
            try {
                Map<String, Class< ? >> declarations = getDeclarationsMap( descr, context, false );
                Map<String, Class< ? >> globals = context.getPackageBuilder().getGlobals();
                alternatives = declarations.containsKey( fieldName ) || globals.containsKey( fieldName );

                reader = context.getPkg().getClassFieldAccessorStore().getReader( ((ClassObjectType) objectType).getClassName(),
                                                                                  fieldName,
                                                                                  target );

            } catch ( final Exception e ) {
                if ( reportError && ! alternatives && context.isTypesafe() ) {
                    copyErrorLocation( e,
                                       descr );
                    context.addError(new DescrBuildError(context.getParentDescr(),
                            descr,
                            e,
                            "Unable to create Field Extractor for '" + fieldName + "'" + e.getMessage()));
                }
                // if there was an error, set the reader back to null
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        DrlExprParser parser = new DrlExprParser();
        ConstraintConnectiveDescr result = parser.parse( expression );
        result.copyLocation( original );
        if ( parser.hasErrors() ) {
            for ( DroolsParserException error : parser.getErrors() ) {
                context.addError(new DescrBuildError(context.getParentDescr(),
                        patternDescr,
                        null,
                        "Unable to parser pattern expression:\n" + error.getMessage()));
            }
            return null;
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                result = parseExpression( context,
                                          patternDescr,
                                          expression );
                if ( result == null ) {
                    // error, can't parse expression.
                    context.addError( new DescrBuildError( context.getParentDescr(),
                                                                  descr,
                                                                  null,
                                                                  "Unable to parse constraint: \n" + expression ) );
                    continue;
                }
                isBinding = result.getDescrs().size() == 1 && result.getDescrs().get( 0 ) instanceof BindingDescr;
                if ( isBinding ) {
                    bind = (BindingDescr) result.getDescrs().get( 0 );
                }
            }

            if ( (!isPositional) && (!isBinding) ) {
                // error, can't have non binding slots.
                context.addError( new DescrBuildError( context.getParentDescr(),
                                                              descr,
                                                              null,
                                                              "Query's must use positional or bindings, not field constraints:\n" + expression ) );
                continue;
            } else if ( isPositional && isBinding ) {
                // error, can't have positional binding slots.
                context.addError( new DescrBuildError( context.getParentDescr(),
                                                              descr,
                                                              null,
                                                              "Query's can't use positional bindings:\n" + expression ) );
                continue;
            } else if ( isPositional ) {
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                // it's an expression and thus an input
                DrlExprParser parser = new DrlExprParser();
                ConstraintConnectiveDescr bresult = parser.parse( bind.getExpression() );
                if ( parser.hasErrors() ) {
                    for ( DroolsParserException error : parser.getErrors() ) {
                        context.addError( new DescrBuildError( context.getParentDescr(),
                                                                      descr,
                                                                      null,
                                                                      "Unable to parser pattern expression:\n" + error.getMessage() ) );
                    }
                    return;
                }

                MVELDumper.MVELDumperContext mvelCtx = new MVELDumper.MVELDumperContext();
                String expr = context.getCompilerFactory().getExpressionProcessor().dump( bresult,
                                                                                          mvelCtx );
                try {
                    MVELDialectRuntimeData data = ( MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
                    ParserConfiguration conf = data.getParserConfiguration();
                    conf.setClassLoader( context.getPackageBuilder().getRootClassLoader() );

                    arguments.set( pos,
                            MVEL.executeExpression( MVEL.compileExpression( expr, new ParserContext( conf ) ) ) );
                } catch ( Exception e ) {
                    context.addError( new DescrBuildError( context.getParentDescr(),
                                                                  descr,
                                                                  null,
                                                                  "Unable to compile expression:\n" + expr ) );
                }                      
            }
        } else {
            // this is creating a new output binding
            // we know it doesn't exist, as we already checked for left == var                   
            declr = pattern.addDeclaration( bind.getVariable() );

            pos = getPos( bind.getExpression(),
                          params );
            if ( pos < 0 ) {
                // error this must be a binding on a slot
                context.addError( new DescrBuildError( context.getParentDescr(),
                                                              descr,
                                                              null,
                                                              "named argument does not exist:\n" + bind.getExpression() ) );
                return;               
            }
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                                    BaseDescr base,
                                    String expression,
                                    ConstraintConnectiveDescr result ) {
        int position = ((ExprConstraintDescr) base).getPosition();
        if ( position >= arguments.size() ) {
            context.addError( new DescrBuildError( context.getParentDescr(),
                                                          base,
                                                          null,
                                                          "Unable to parse query '" + query.getName() + "', as postion " + (position-1) + " for expression '" + expression + "' does not exist on query size " + arguments.size()) );
            return;           
        }
        if ( isVariable( expression ) ) {
            // is this already bound?
            Declaration declr = context.getDeclarationResolver().getDeclaration( query,
                                                                                 expression );
            if ( declr != null ) {
                // it exists, so it's an input
                arguments.set( position,
                               declr );
                declrIndexes.add( position );
                requiredDeclarations.add( declr );
            } else {
                // it doesn't exist, so it's an output
                arguments.set( position,
                               Variable.v );
               
                varIndexes.add( position );
                              
                declr = pattern.addDeclaration( expression );

                // this bit is different, notice its the ArrayElementReader that we wire up to, not the declaration.
                ArrayElementReader reader = new ArrayElementReader( arrayReader,
                                                                    position,
                                                                    params[position].getExtractor().getExtractToClass() );

                declr.setReadAccessor( reader );
            }
        } else {
            // it's an expression and thus an input
            MVELDumper.MVELDumperContext mvelCtx = new MVELDumper.MVELDumperContext();
            String rewrittenExpr = context.getCompilerFactory().getExpressionProcessor().dump( result, mvelCtx );

            try {
                MVELDialectRuntimeData data = ( MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
                ParserConfiguration conf = data.getParserConfiguration();
                conf.setClassLoader( context.getPackageBuilder().getRootClassLoader() );

                arguments.set( position,
                        MVEL.executeExpression( MVEL.compileExpression( rewrittenExpr, new ParserContext( conf ) ) ) );
            } catch ( Exception e ) {
                context.addError( new DescrBuildError( context.getParentDescr(),
                        base,
                        null,
                        "Unable to compile expression:\n" + rewrittenExpr ) );

            }
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                                                       final String expression ) {
        DrlExprParser parser = new DrlExprParser();
        ConstraintConnectiveDescr result = parser.parse( expression );
        if ( result == null || parser.hasErrors() ) {
            for ( DroolsParserException error : parser.getErrors() ) {
                context.addError( new DescrBuildError( context.getParentDescr(),
                                                              patternDescr,
                                                              null,
                                                              "Unable to parser pattern expression:\n" + error.getMessage() ) );
            }
            return null;
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            expr.compile( data );
            return expr;
        } catch ( final Exception e ) {
            copyErrorLocation(e, context.getRuleDescr());
            context.addError( new DescrBuildError( context.getParentDescr(),
                                                          context.getRuleDescr(),
                                                          null,
                                                          "Unable to build expression : " + e.getMessage() + "'" + expression + "'" ) );
            return null;
        } finally {
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            expr.compile( data );
            return eval;
        } catch ( final Exception e ) {
            copyErrorLocation(e, evalDescr);
            context.addError( new DescrBuildError( context.getParentDescr(),
                                                          evalDescr,
                                                          e,
                                                          "Unable to build expression for 'eval':" + e.getMessage() + " '" + evalDescr.getContent() + "'" ) );
            return null;
        } finally {
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                                                 localTypes,
                                                 "drools",
                                                 KnowledgeHelper.class );
        } catch ( final Exception e ) {
            copyErrorLocation(e, descr);
            context.addError( new DescrBuildError( context.getParentDescr(),
                                                          descr,
                                                          null,
                                                          "Unable to determine the used declarations.\n" + e.getMessage() ) );
        } finally {
            // setting it back to original parent descr
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                                 expr );

            expr.compile( data );
        } catch ( final Exception e ) {
            copyErrorLocation(e, context.getRuleDescr());
            context.addError( new DescrBuildError( context.getParentDescr(),
                                                          context.getRuleDescr(),
                                                          null,
                                                          "Unable to build expression for 'enabled' : " + e.getMessage() + " '" + context.getRuleDescr().getEnabled() + "'" ) );
        }
    }
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Related Classes of org.drools.compiler.DescrBuildError

  • org.drools.integrationtests.MiscTest
  • org.drools.rule.builder.ConstraintBuilder
  • org.drools.rule.builder.dialect.DialectUtil
  • org.drools.rule.builder.dialect.java.JavaAccumulateBuilder
  • org.drools.rule.builder.dialect.java.JavaConsequenceBuilder
  • org.drools.rule.builder.dialect.java.JavaDialect
  • org.drools.rule.builder.dialect.mvel.MVELAccumulateBuilder
  • org.drools.rule.builder.dialect.mvel.MVELActionBuilder
  • org.drools.rule.builder.dialect.mvel.MVELConsequenceBuilder
  • org.drools.rule.builder.dialect.mvel.MVELDialect
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