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public class: BeansWrapper [javadoc | source]

All Implemented Interfaces:

Direct Known Subclasses:
    SimpleObjectWrapper, DefaultObjectWrapper, RhinoWrapper

Utility class that provides generic services to reflection classes. It handles all polymorphism issues in the #wrap(Object) and #unwrap(TemplateModel) methods.
Field Summary
public static final  Object CAN_NOT_UNWRAP     
static final  Object GENERIC_GET_KEY     
public static final  int EXPOSE_ALL    At this level of exposure, all methods and properties of the wrapped objects are exposed to the template. 
public static final  int EXPOSE_SAFE    At this level of exposure, all methods and properties of the wrapped objects are exposed to the template except methods that are deemed not safe. The not safe methods are java.lang.Object methods wait() and notify(), java.lang.Class methods getClassLoader() and newInstance(), java.lang.reflect.Method and java.lang.reflect.Constructor invoke() and newInstance() methods, all java.lang.reflect.Field set methods, all java.lang.Thread and java.lang.ThreadGroup methods that can change its state, as well as the usual suspects in java.lang.System and java.lang.Runtime. 
public static final  int EXPOSE_PROPERTIES_ONLY    At this level of exposure, only property getters are exposed. Additionally, property getters that map to unsafe methods are not exposed (i.e. Class.classLoader and Thread.contextClassLoader). 
public static final  int EXPOSE_NOTHING    At this level of exposure, no bean properties and methods are exposed. Only map items, resource bundle items, and objects retrieved through the generic get method (on objects of classes that have a generic get method) can be retrieved through the hash interface. You might want to call #setMethodsShadowItems(boolean) with false value to speed up map item retrieval. 
 public BeansWrapper() 
Method from freemarker.ext.beans.BeansWrapper Summary:
coerceBigDecimal,   coerceBigDecimals,   coerceBigDecimals,   getArgTypes,   getClassKeyMap,   getDefaultDateType,   getDefaultInstance,   getEnumModels,   getExposureLevel,   getInstance,   getModelFactory,   getOuterIdentity,   getStaticModels,   introspectClass,   invokeMethod,   isExposeFields,   isMethodsShadowItems,   isSafeMethod,   isSimpleMapWrapper,   isStrict,   keyCount,   keySet,   newInstance,   setDefaultDateType,   setExposeFields,   setExposureLevel,   setMethodsShadowItems,   setNullModel,   setOuterIdentity,   setSimpleMapWrapper,   setStrict,   setUseCache,   unwrap,   unwrap,   wrap
Methods from java.lang.Object:
equals,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait
Method from freemarker.ext.beans.BeansWrapper Detail:
 public static Object coerceBigDecimal(BigDecimal bd,
    Class formalType) 
 public static  void coerceBigDecimals(AccessibleObject callable,
    Object[] args) 
    Converts any BigDecimal s in the passed array to the type of the corresponding formal argument of the method.
 public static  void coerceBigDecimals(Class[] formalTypes,
    Object[] args) 
    Converts any BigDecimal s in the passed array to the type of the corresponding formal argument of the method.
 static Class[] getArgTypes(Map classMap,
    AccessibleObject methodOrCtor) 
 Map getClassKeyMap(Class clazz) 
 protected int getDefaultDateType() 
 public static final BeansWrapper getDefaultInstance() 
    Returns the default instance of the wrapper. This instance is used when you construct various bean models without explicitly specifying a wrapper. It is also returned by freemarker.template.ObjectWrapper#BEANS_WRAPPER and this is the sole instance that is used by the JSP adapter. You can modify the properties of the default instance (caching, exposure level, null model) to affect its operation. By default, the default instance is not caching, uses the EXPOSE_SAFE exposure level, and uses null reference as the null model.
 public TemplateHashModel getEnumModels() 
    Returns a hash model that represents the so-called class enum models. Every class' enum model is itself a hash through which you can access enum value declared by the specified class, assuming that class is an enumeration. To obtain an enum model for a class, get the element of this hash with the fully qualified class name. For example, if you place this hash model inside the root data model under name "enums", you can use i.e. statics["java.math.RoundingMode"].UP to access the java.math.RoundingMode#UP value.
 int getExposureLevel() 
 protected TemplateModel getInstance(Object object,
    ModelFactory factory) 
Deprecated! override - #getModelFactory(Class) instead. Using this method will now bypass wrapper caching (if it is enabled) and always result in creation of a new wrapper. This method will be removed in 2.4

 protected ModelFactory getModelFactory(Class clazz) 
 public ObjectWrapper getOuterIdentity() 
    By default returns this.
 public TemplateHashModel getStaticModels() 
    Returns a hash model that represents the so-called class static models. Every class static model is itself a hash through which you can call static methods on the specified class. To obtain a static model for a class, get the element of this hash with the fully qualified class name. For example, if you place this hash model inside the root data model under name "statics", you can use i.e. statics["java.lang. System"]. currentTimeMillis() to call the java.lang.System#currentTimeMillis() method.
  void introspectClass(Class clazz) 
 TemplateModel invokeMethod(Object object,
    Method method,
    Object[] args) throws InvocationTargetException, TemplateModelException, IllegalAccessException 
    Invokes the specified method, wrapping the return value. The specialty of this method is that if the return value is null, and the return type of the invoked method is void, TemplateModel#NOTHING is returned.
 public boolean isExposeFields() 
 boolean isMethodsShadowItems() 
 boolean isSafeMethod(Method method) 
 public boolean isSimpleMapWrapper() 
 public boolean isStrict() 
 int keyCount(Class clazz) 
 Set keySet(Class clazz) 
 public Object newInstance(Class clazz,
    List arguments) throws TemplateModelException 
 public synchronized  void setDefaultDateType(int defaultDateType) 
    Sets the default date type to use for date models that result from a plain java.util.Date instead of java.sql.Date or java.sql.Time or java.sql.Timestamp. Default value is TemplateDateModel#UNKNOWN .
 public  void setExposeFields(boolean exposeFields) 
    Controls whether public instance fields of classes are exposed to templates.
 public  void setExposureLevel(int exposureLevel) 
    Sets the method exposure level. By default, set to EXPOSE_SAFE.
 public synchronized  void setMethodsShadowItems(boolean methodsShadowItems) 
    Sets whether methods shadow items in beans. When true (this is the default value), ${} will first try to locate a bean method or property with the specified name on the object, and only if it doesn't find it will it try to call object.get(name), the so-called "generic get method" that is usually used to access items of a container (i.e. elements of a map). When set to false, the lookup order is reversed and generic get method is called first, and only if it returns null is method lookup attempted.
 public  void setNullModel(TemplateModel nullModel) 
    Sets the null model. This model is returned from the #wrap(Object) method whenever the underlying object reference is null. It defaults to null reference, which is dealt with quite strictly on engine level, however you can substitute an arbitrary (perhaps more lenient) model, such as freemarker.template.TemplateScalarModel#EMPTY_STRING .
 public  void setOuterIdentity(ObjectWrapper outerIdentity) 
    When wrapping an object, the BeansWrapper commonly needs to wrap "sub-objects", for example each element in a wrapped collection. Normally it wraps these objects using itself. However, this makes it difficult to delegate to a BeansWrapper as part of a custom aggregate ObjectWrapper. This method lets you set the ObjectWrapper which will be used to wrap the sub-objects.
 public  void setSimpleMapWrapper(boolean simpleMapWrapper) 
    By default the BeansWrapper wraps classes implementing java.util.Map using MapModel . Setting this flag will cause it to use a SimpleMapModel instead. The biggest difference is that when using a SimpleMapModel , the map will be visible as TemplateHashModelEx, and the subvariables will be the content of the map, without the other methods and properties of the map object.
 public  void setStrict(boolean strict) 
    Specifies if an attempt to read a bean property that doesn't exist in the wrapped object should throw an InvalidPropertyException .

    If this property is false (the default) then an attempt to read a missing bean property is the same as reading an existing bean property whose value is null. The template can't tell the difference, and thus always can use ?default('something') and ?exists and similar built-ins to handle the situation.

    If this property is true then an attempt to read a bean propertly in the template (like myBean.aProperty) that doesn't exist in the bean object (as opposed to just holding null value) will cause InvalidPropertyException , which can't be suppressed in the template (not even with myBean.noSuchProperty?default('something')). This way ?default('something') and ?exists and similar built-ins can be used to handle existing properties whose value is null, without the risk of hiding typos in the property names. Typos will always cause error. But mind you, it goes against the basic approach of FreeMarker, so use this feature only if you really know what are you doing.

 public  void setUseCache(boolean useCache) 
    Sets whether this wrapper caches model instances. Default is false. When set to true, calling #wrap(Object) multiple times for the same object will likely return the same model (although there is no guarantee as the cache items can be cleared anytime).
 public Object unwrap(TemplateModel model) throws TemplateModelException 
 public Object unwrap(TemplateModel model,
    Class hint) throws TemplateModelException 
 public TemplateModel wrap(Object object) throws TemplateModelException