Examples of org.mvel2.asm.commons.GeneratorAdapter

org.ow2.asm.commons.GeneratorAdapter

A {@link org.mvel2.asm.MethodVisitor} with convenient methods to generatecode. For example, using this adapter, the class below

 public class Example { public static void main(String[] args) { System.out.println("Hello world!"); } }

can be generated as follows:

 ClassWriter cw = new ClassWriter(true); cw.visit(V1_1, ACC_PUBLIC, "Example", null, "java/lang/Object", null); Method m = Method.getMethod("void <init> ()"); GeneratorAdapter mg = new GeneratorAdapter(ACC_PUBLIC, m, null, null, cw); mg.loadThis(); mg.invokeConstructor(Type.getType(Object.class), m); mg.returnValue(); mg.endMethod(); m = Method.getMethod("void main (String[])"); mg = new GeneratorAdapter(ACC_PUBLIC + ACC_STATIC, m, null, null, cw); mg.getStatic(Type.getType(System.class), "out", Type.getType(PrintStream.class)); mg.push("Hello world!"); mg.invokeVirtual(Type.getType(PrintStream.class), Method.getMethod("void println (String)")); mg.returnValue(); mg.endMethod(); cw.visitEnd();

@author Juozas Baliuka @author Chris Nokleberg @author Eric Bruneton @author Prashant Deva

  
  public VariableResolver getVariableResolver(String name) {
    Object value = ((VariableScopeInstance)
      nodeInstance.resolveContextInstance(
          VariableScope.VARIABLE_SCOPE, name)).getVariable(name);
    return new SimpleValueResolver(value);
  }

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    return variableScope.getVariable(name) != null;
  }
  
  public VariableResolver getVariableResolver(String name) {
    Object value = variableScope.getVariable(name);
    return new SimpleValueResolver(value);
  }

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    }


    @Override
    public void load(String name, String view) {
        // compile the template
        CompiledTemplate compiled = TemplateCompiler.compileTemplate(view);
        registry.addNamedTemplate(name, compiled);
    }

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    protected static String JAVA_RULE_MVEL             = "javaRule.mvel";
    protected static String JAVA_INVOKERS_MVEL         = "javaInvokers.mvel";


    public static void setConsequenceTemplate( String name ) {
        JAVA_RULE_MVEL = name;
        RULE_REGISTRY = new SimpleTemplateRegistry();
    }

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        RULE_REGISTRY = new SimpleTemplateRegistry();
    }


    public static void setInvokerTemplate( String name ) {
        JAVA_INVOKERS_MVEL = name;
        INVOKER_REGISTRY = new SimpleTemplateRegistry();
    }

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                                 final ProcessBuildContext context,
                                 final String className,
                                 final Map vars,
                                 final Object invokerLookup,
                                 final BaseDescr descrLookup) {
        TemplateRegistry registry = getRuleTemplateRegistry();


        context.getMethods().add(
                TemplateRuntime.execute(registry.getNamedTemplate(ruleTemplate), null, new MapVariableResolverFactory(vars), registry)
        );


        registry = getInvokerTemplateRegistry();
        final String invokerClassName = context.getPkg().getName() + "." + context.getProcessDescr().getClassName() + StringUtils.ucFirst(className) + "Invoker";


        context.getInvokers().put(invokerClassName,
                TemplateRuntime.execute(registry.getNamedTemplate(invokerTemplate), null, new MapVariableResolverFactory(vars), registry)
        );


        context.getInvokerLookups().put(invokerClassName,
                invokerLookup);
        context.getDescrLookups().put(invokerClassName,

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        generateMethodTemplate(ruleTemplate, context, vars);
        generateInvokerTemplate(invokerTemplate, context, className, vars, invokerLookup, descrLookup);
    }


    public static void generateMethodTemplate(final String ruleTemplate, final RuleBuildContext context, final Map vars) {
        TemplateRegistry registry = getRuleTemplateRegistry(context.getPackageBuilder().getRootClassLoader());


        context.addMethod((String) TemplateRuntime.execute( registry.getNamedTemplate(ruleTemplate),
                                                            null,
                                                            new MapVariableResolverFactory(vars),
                                                            registry) );
    }

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                                               final RuleBuildContext context,
                                               final String className,
                                               final Map vars,
                                               final Object invokerLookup,
                                               final BaseDescr descrLookup) {
        TemplateRegistry registry = getInvokerTemplateRegistry(context.getPackageBuilder().getRootClassLoader());
        final String invokerClassName = context.getPkg().getName() + "." + context.getRuleDescr().getClassName() + StringUtils.ucFirst( className ) + "Invoker";


        context.getInvokers().put( invokerClassName,
                                   (String) TemplateRuntime.execute( registry.getNamedTemplate( invokerTemplate ),
                                                                     null,
                                                                     new MapVariableResolverFactory( vars ),
                                                                     registry ) );


        context.getInvokerLookups().put( invokerClassName,

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        String[] allVars = new String[varNames.length + locals.length];


        System.arraycopy(varNames, 0, allVars, 0, varNames.length);
        System.arraycopy(locals, 0, allVars, varNames.length, locals.length);        
        
        this.varModel = new SimpleVariableSpaceModel(allVars);
        this.allVarsLength = allVars.length;
        
        return stmt;
    }

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        cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        cw.visit(V1_1, ACC_PUBLIC, "Example", null, "java/lang/Object", null);


        // creates a GeneratorAdapter for the (implicit) constructor
        Method m = Method.getMethod("void <init> ()");
        GeneratorAdapter mg = new GeneratorAdapter(ACC_PUBLIC,
                m,
                null,
                null,
                cw);
        mg.loadThis();
        mg.invokeConstructor(Type.getType(Object.class), m);
        mg.returnValue();
        mg.endMethod();


        // creates a GeneratorAdapter for the 'main' method
        m = Method.getMethod("void main (String[])");
        mg = new GeneratorAdapter(ACC_PUBLIC + ACC_STATIC, m, null, null, cw);
        mg.getStatic(Type.getType(System.class),
                "out",
                Type.getType(PrintStream.class));
        mg.push("Hello world!");
        mg.invokeVirtual(Type.getType(PrintStream.class),
                Method.getMethod("void println (String)"));
        mg.returnValue();
        mg.endMethod();


        cw.visitEnd();


        code = cw.toByteArray();
        loader = new Helloworld();

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