private Object getInstance()

in blueprint/blueprint-noosgi/src/main/java/org/apache/aries/blueprint/container/BeanRecipe.java [251:337]
69 lines of code
19 McCabe index (conditional complexity)

    private Object getInstance() throws ComponentDefinitionException {
        Object instance;

        // Instanciate arguments
        List<Object> args = new ArrayList<Object>();
        List<ReifiedType> argTypes = new ArrayList<ReifiedType>();
        if (arguments != null) {
            for (int i = 0; i < arguments.size(); i++) {
                Object arg = arguments.get(i);
                if (arg instanceof Recipe) {
                    args.add(((Recipe) arg).create());
                } else {
                    args.add(arg);
                }
                if (this.argTypes != null) {
                    argTypes.add(this.argTypes.get(i) != null ? loadType(this.argTypes.get(i)) : null);
                }
            }
        }

        if (factory != null) {
            // look for instance method on factory object
            Object factoryObj = factory.create();

            // If the factory is a service reference, we need to get hold of the actual proxy for the service
            /* BLUEPRINT-NOOSGI
            if (factoryObj instanceof ReferenceRecipe.ServiceProxyWrapper) {
                try {
                    factoryObj = ((ReferenceRecipe.ServiceProxyWrapper) factoryObj).convert(new ReifiedType(Object.class));
                } catch (Exception e) {
                    throw new ComponentDefinitionException("Error when instantiating bean " + getName() + " of class " + getType(), getRealCause(e));
                }
            } else*/ if (factoryObj instanceof UnwrapperedBeanHolder) {
                factoryObj = wrap((UnwrapperedBeanHolder) factoryObj, Object.class);
            }

            // Map of matching methods
            Map<Method, List<Object>> matches = findMatchingMethods(factoryObj.getClass(), factoryMethod, true, args, argTypes);
            if (matches.size() == 1) {
                try {
                    Map.Entry<Method, List<Object>> match = matches.entrySet().iterator().next();
                    instance = invoke(match.getKey(), factoryObj, match.getValue().toArray());
                } catch (Throwable e) {
                    throw new ComponentDefinitionException("Error when instantiating bean " + getName() + " of class " + getType(), getRealCause(e));
                }
            } else if (matches.size() == 0) {
                throw new ComponentDefinitionException("Unable to find a matching factory method " + factoryMethod + " on class " + factoryObj.getClass().getName() + " for arguments " + args + " when instanciating bean " + getName());
            } else {
                throw new ComponentDefinitionException("Multiple matching factory methods " + factoryMethod + " found on class " + factoryObj.getClass().getName() + " for arguments " + args + " when instanciating bean " + getName() + ": " + matches.keySet());
            }
        } else if (factoryMethod != null) {
            // Map of matching methods
            Map<Method, List<Object>> matches = findMatchingMethods(getType(), factoryMethod, false, args, argTypes);
            if (matches.size() == 1) {
                try {
                    Map.Entry<Method, List<Object>> match = matches.entrySet().iterator().next();
                    instance = invoke(match.getKey(), null, match.getValue().toArray());
                } catch (Throwable e) {
                    throw new ComponentDefinitionException("Error when instanciating bean " + getName() + " of class " + getType(), getRealCause(e));
                }
            } else if (matches.size() == 0) {
                throw new ComponentDefinitionException("Unable to find a matching factory method " + factoryMethod + " on class " + getType().getName() + " for arguments " + args + " when instanciating bean " + getName());
            } else {
                throw new ComponentDefinitionException("Multiple matching factory methods " + factoryMethod + " found on class " + getType().getName() + " for arguments " + args + " when instanciating bean " + getName() + ": " + matches.keySet());
            }
        } else {
            if (getType() == null) {
                throw new ComponentDefinitionException("No factoryMethod nor class is defined for this bean");
            }
            // Map of matching constructors
            Map<Constructor, List<Object>> matches = findMatchingConstructors(getType(), args, argTypes);
            if (matches.size() == 1) {
                try {
                    Map.Entry<Constructor, List<Object>> match = matches.entrySet().iterator().next();
                    instance = newInstance(match.getKey(), match.getValue().toArray());
                } catch (Throwable e) {
                    throw new ComponentDefinitionException("Error when instanciating bean " + getName() + " of class " + getType(), getRealCause(e));
                }
            } else if (matches.size() == 0) {
                throw new ComponentDefinitionException("Unable to find a matching constructor on class " + getType().getName() + " for arguments " + args + " when instanciating bean " + getName());
            } else {
                throw new ComponentDefinitionException("Multiple matching constructors found on class " + getType().getName() + " for arguments " + args + " when instanciating bean " + getName() + ": " + matches.keySet());
            }
        }

        return instance;
    }