Package org.mvel2

Examples of org.mvel2.ConversionHandler


    }

    String targetRunMvel = mvel + ";\n for(i = 0; i < " + RUNS + "; i++) {\n "
        + mvelCallable + "\n}\n";

    ParserContext parserContext = new ParserContext();
    parserContext.addIndexedInput(new String[0]);

    VariableResolverFactory factory =
        VariableSpaceCompiler.compile(targetRunMvel, parserContext).createFactory(new Object[0]);
    compiledMvel = MVEL.compileExpression(targetRunMvel, parserContext);
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        strictMode = in.readBoolean();
    }   

    public Serializable getCompiledExpression(MVELDialectRuntimeData runtimeData ) {       
        ParserConfiguration conf = runtimeData.getParserConfiguration();
        final ParserContext parserContext = new ParserContext( conf );
        if ( MVELDebugHandler.isDebugMode() ) {
            parserContext.setDebugSymbols( true );
        }

        parserContext.setStrictTypeEnforcement( strictMode );
        parserContext.setStrongTyping( strictMode );
        parserContext.setIndexAllocation( true );

        if ( interceptors != null ) {
            parserContext.setInterceptors( interceptors );
        }

        parserContext.addIndexedInput( inputIdentifiers );
               
        String identifier = null;
        String type = null;
        try {
            for ( int i = 0, length = inputIdentifiers.length; i < length; i++ ) {
                identifier = inputIdentifiers[i];
                type = inputTypes[i];
                Class< ? > cls = loadClass( runtimeData.getRootClassLoader(),
                                            inputTypes[i] );
                parserContext.addInput( inputIdentifiers[i],
                                        cls );
            }
        } catch ( ClassNotFoundException e ) {
            throw new RuntimeDroolsException( "Unable to resolve class '" + type + "' for identifier '" + identifier );
        }

        parserContext.setSourceFile( name );

        String[] varNames = parserContext.getIndexedVarNames();
       
        ExecutableStatement stmt = (ExecutableStatement) compile( expression,
                                                                  runtimeData.getRootClassLoader(),
                                                                  parserContext,
                                                                  languageLevel );
       
        Set<String> localNames = parserContext.getVariables().keySet();

        parserContext.addIndexedLocals(localNames);

        String[] locals = localNames.toArray(new String[localNames.size()]);
        String[] allVars = new String[varNames.length + locals.length];

        System.arraycopy(varNames, 0, allVars, 0, varNames.length);
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        MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
        ParserConfiguration conf = data.getParserConfiguration();

        conf.setClassLoader( context.getKnowledgeBuilder().getRootClassLoader() );

        final ParserContext pctx = new ParserContext( conf );
        pctx.setStrictTypeEnforcement(false);
        pctx.setStrongTyping( false );
        pctx.addInput( "this",
                       thisClass );
        pctx.addInput( "empty",
                       boolean.class ); // overrides the mvel empty label
        MVEL.COMPILER_OPT_ALLOW_NAKED_METH_CALL = true;
        MVEL.COMPILER_OPT_ALLOW_OVERRIDE_ALL_PROPHANDLING = true;
        MVEL.COMPILER_OPT_ALLOW_RESOLVE_INNERCLASSES_WITH_DOTNOTATION = true;
        MVEL.COMPILER_OPT_SUPPORT_JAVA_STYLE_CLASS_LITERALS = true;

        try {
            MVEL.analysisCompile( expr, pctx );
        } catch (Exception e) {
            // There is a problem in setting the inputs for this expression, but it will be
            // reported during expression analysis, so swallow it at the moment
            return;
        }

        if ( !pctx.getInputs().isEmpty() ) {
            for ( String v : pctx.getInputs().keySet() ) {
                // in the following if, we need to check that the expr actually contains a reference
                // to an "empty" property, or the if will evaluate to true even if it doesn't
                if ( "this".equals( v ) || (PropertyTools.getFieldOrAccessor( thisClass,
                                                                               v ) != null && expr.matches( "(^|.*\\W)empty($|\\W.*)" )) ) {
                    descrBranch.getFieldAccessors().add( v );
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            MVEL.COMPILER_OPT_ALLOW_RESOLVE_INNERCLASSES_WITH_DOTNOTATION = true;
            MVEL.COMPILER_OPT_SUPPORT_JAVA_STYLE_CLASS_LITERALS = true;

            MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
            ParserConfiguration pconf = data.getParserConfiguration();
            ParserContext pctx = new ParserContext( pconf );

            Object o = MVELSafeHelper.getEvaluator().executeExpression( MVEL.compileExpression( value,
                    pctx ) );
            if ( o != null && vtype == null ) {
                // was a compilation problem else where, so guess valuetype so we can continue
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                throw new IllegalArgumentException("Cannot use a qualifier without a CDI container");
            }

            ParserConfiguration config = new ParserConfiguration();
            config.setClassLoader(cl);
            ParserContext ctx = new ParserContext(config);
            if (parameters != null) {
                for (Map.Entry<String, Object> entry : parameters.entrySet()) {
                    ctx.addVariable(entry.getKey(), entry.getValue().getClass());
                }
            }

            Object compiledExpression = MVEL.compileExpression(type, ctx);
            return (T)MVELSafeHelper.getEvaluator().executeExpression( compiledExpression, parameters );
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                    MVELDialectRuntimeData data = ( MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
                    ParserConfiguration conf = data.getParserConfiguration();
                    conf.setClassLoader( context.getPackageBuilder().getRootClassLoader() );

                    arguments.set( pos,
                    MVELSafeHelper.getEvaluator().executeExpression( MVEL.compileExpression( expr, new ParserContext( conf ) ) ) );
                } catch ( Exception e ) {
                    context.addError( new DescrBuildError( context.getParentDescr(),
                                                                  descr,
                                                                  null,
                                                                  "Unable to compile expression:\n" + expr ) );
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            try {
                MVELDialectRuntimeData data = ( MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
                ParserConfiguration conf = data.getParserConfiguration();
                conf.setClassLoader( context.getPackageBuilder().getRootClassLoader() );

                arguments.set( position, MVELSafeHelper.getEvaluator().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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            conf.setClassLoader( context.getPackageBuilder().getRootClassLoader() );

            // first compilation is for verification only
            // @todo proper source file name
            final ParserContext parserContext1 = new ParserContext( conf );
            if ( localTypes != null ) {
                for ( Entry entry : localTypes.entrySet() ) {
                    parserContext1.addInput( (String) entry.getKey(),
                                             (Class) entry.getValue() );
                }
            }
            if ( availableIdentifiers.getThisClass() != null ) {
                parserContext1.addInput( "this",
                                         availableIdentifiers.getThisClass() );
            }

            if ( availableIdentifiers.getOperators() != null ) {
                for ( Entry<String, EvaluatorWrapper> opEntry : availableIdentifiers.getOperators().entrySet() ) {
                    parserContext1.addInput( opEntry.getKey(), opEntry.getValue().getClass() );
                }
            }

            parserContext1.setStrictTypeEnforcement( false );
            parserContext1.setStrongTyping( false );
            parserContext1.setInterceptors( dialect.getInterceptors() );
            Class< ? > returnType;

            try {
                returnType = MVEL.analyze( expr,
                                           parserContext1 );
            } catch ( Exception e ) {
                BaseDescr base = (context instanceof RuleBuildContext) ? ((RuleBuildContext)context).getRuleDescr() : context.getParentDescr();
                DialectUtil.copyErrorLocation(e, context.getParentDescr());
                context.addError( new DescrBuildError( base,
                                                              context.getParentDescr(),
                                                              null,
                                                              "Unable to Analyse Expression " + expr + ":\n" + e.getMessage() ) );
                return null;
            }

            Set<String> requiredInputs = new HashSet<String>();
            requiredInputs.addAll( parserContext1.getInputs().keySet() );
            HashMap<String, Class< ? >> variables = (HashMap<String, Class< ? >>) ((Map) parserContext1.getVariables());
            if ( localTypes != null ) {
                for ( String str : localTypes.keySet() ) {
                    // we have to do this due to mvel regressions on detecting true local vars
                    variables.remove( str );
                }
            }

            // MVEL includes direct fields of context object in non-strict mode. so we need to strip those
            if ( availableIdentifiers.getThisClass() != null ) {
                for ( Iterator<String> it = requiredInputs.iterator(); it.hasNext(); ) {
                    if ( PropertyTools.getFieldOrAccessor( availableIdentifiers.getThisClass(),
                                                           it.next() ) != null ) {
                        it.remove();
                    }
                }
            }

            // now, set the required input types and compile again
            final ParserContext parserContext2 = new ParserContext( conf );
            parserContext2.setStrictTypeEnforcement( true );
            parserContext2.setStrongTyping( true );
            parserContext2.setInterceptors( dialect.getInterceptors() );

            for ( String str : requiredInputs ) {
                Class< ? > cls = availableIdentifiers.getDeclrClasses().get( str );
                if ( cls != null ) {
                    parserContext2.addInput( str,
                                             cls );
                    continue;
                }

                cls = availableIdentifiers.getGlobals().get( str );
                if ( cls != null ) {
                    parserContext2.addInput( str,
                                             cls );
                    continue;
                }

                cls = availableIdentifiers.getOperators().keySet().contains( str ) ? context.getConfiguration().getComponentFactory().getExpressionProcessor().getEvaluatorWrapperClass() : null;
                if ( cls != null ) {
                    parserContext2.addInput( str,
                                             cls );
                    continue;
                }

                if ( str.equals( contextIndeifier ) ) {
                    parserContext2.addInput( contextIndeifier,
                                             kcontextClass );
                } else if ( str.equals( "kcontext" ) ) {
                    parserContext2.addInput( "kcontext",
                                             kcontextClass );
                }
                if ( str.equals( "rule" ) ) {
                    parserContext2.addInput( "rule",
                                             Rule.class );
                }

                if ( localTypes != null ) {
                    cls = localTypes.get( str );
                    if ( cls != null ) { 
                        parserContext2.addInput( str,
                                                 cls );
                    }
                }
            }  
           
            if ( availableIdentifiers.getThisClass() != null ) {
                parserContext2.addInput( "this",
                                         availableIdentifiers.getThisClass() );
            }

            boolean typesafe = context.isTypesafe();
           
            try {
                returnType = MVEL.analyze( expr,
                                           parserContext2 );
                typesafe = true;
            } catch ( Exception e ) {
                // is this an error, or can we fall back to non-typesafe mode?
                if ( typesafe ) {
                    BaseDescr base = (context instanceof RuleBuildContext) ? ((RuleBuildContext)context).getRuleDescr() : context.getParentDescr();
                    DialectUtil.copyErrorLocation(e, context.getParentDescr());
                    context.addError( new DescrBuildError( base,
                                                           context.getParentDescr(),
                                                           null,
                                                           "Unable to Analyse Expression " + expr + ":\n" + e.getMessage() ) );
                    return null;                   
                }
            }

            if ( typesafe ) {
                requiredInputs = new HashSet<String>();
                requiredInputs.addAll( parserContext2.getInputs().keySet() );
                requiredInputs.addAll( variables.keySet() );
                variables = (HashMap<String, Class< ? >>) ((Map) parserContext2.getVariables());
                if ( localTypes != null ) {
                    for ( String str : localTypes.keySet() ) {
                        // we have to do this due to mvel regressions on detecting true local vars
                        variables.remove( str );
                    }               
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        MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
        ParserConfiguration conf = data.getParserConfiguration();

        conf.setClassLoader( context.getPackageBuilder().getRootClassLoader() );

        final ParserContext pctx = new ParserContext( conf );
        pctx.setStrictTypeEnforcement(false);
        pctx.setStrongTyping( false );
        pctx.addInput( "this",
                       thisClass );
        pctx.addInput( "empty",
                       boolean.class ); // overrides the mvel empty label
        MVEL.COMPILER_OPT_ALLOW_NAKED_METH_CALL = true;
        MVEL.COMPILER_OPT_ALLOW_OVERRIDE_ALL_PROPHANDLING = true;
        MVEL.COMPILER_OPT_ALLOW_RESOLVE_INNERCLASSES_WITH_DOTNOTATION = true;
        MVEL.COMPILER_OPT_SUPPORT_JAVA_STYLE_CLASS_LITERALS = true;

        try {
            MVEL.analysisCompile( expr, pctx );
        } catch (Exception e) {
            // There is a problem in setting the inputs for this expression, but it will be
            // reported during expression analysis, so swallow it at the moment
            return;
        }

        if ( !pctx.getInputs().isEmpty() ) {
            for ( String v : pctx.getInputs().keySet() ) {
                // in the following if, we need to check that the expr actually contains a reference
                // to an "empty" property, or the if will evaluate to true even if it doesn't
                if ( "this".equals( v ) || (PropertyTools.getFieldOrAccessor( thisClass,
                                                                               v ) != null && expr.matches( "(^|.*\\W)empty($|\\W.*)" )) ) {
                    descrBranch.getFieldAccessors().add( v );
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            MVEL.COMPILER_OPT_ALLOW_RESOLVE_INNERCLASSES_WITH_DOTNOTATION = true;
            MVEL.COMPILER_OPT_SUPPORT_JAVA_STYLE_CLASS_LITERALS = true;

            MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
            ParserConfiguration pconf = data.getParserConfiguration();
            ParserContext pctx = new ParserContext( pconf );

            Object o = MVELSafeHelper.getEvaluator().executeExpression( MVEL.compileExpression( value,
                    pctx ) );
            if ( o != null && vtype == null ) {
                // was a compilation problem else where, so guess valuetype so we can continue
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