org.jibx.binding.def
Class ObjectBinding

java.lang.Object
  extended by org.jibx.binding.def.PassThroughComponent
      extended by org.jibx.binding.def.ObjectBinding
All Implemented Interfaces:
IComponent, IContextObj

public class ObjectBinding
extends PassThroughComponent
implements IComponent, IContextObj

Binding modifiers that apply to a class reference. This adds the methods used for handling binding operations to the object class, then generates calls to the added methods as this binding definition is used.

Version:
1.0
Author:
Dennis M. Sosnoski

Field Summary
private static org.apache.bcel.generic.Type[] EMPTY_ARGS
           
private static java.lang.String[] FACTORY_HOOK_SIGNATURES
           
private static java.lang.String GETSTACKTOP_SIGNATURE
           
private  BoundClass m_class
          Class linked to mapping.
private  IContainer m_container
          Containing binding definition structure.
private  ClassFile m_createClass
          Type to be used for creating new instances.
private  ClassItem m_factoryMethod
          Object factory method.
private  IComponent m_idChild
          Child supplying instance identifier value.
private  boolean m_isStaticMarshal
          Flag for static marshal methods.
private  boolean m_isStaticUnmarshal
          Flag for static unmarshal methods.
private  boolean m_isThisBinding
          Flag for "this" reference, meaning that there's no separate object instance created.
private  boolean m_lockAttributeMarshal
          Flag for recursion while generating attribute marshal.
private  boolean m_lockAttributeUnmarshal
          Flag for recursion while generating attribute unmarshal.
private  boolean m_lockContentMarshal
          Flag for recursion while generating attribute marshal.
private  boolean m_lockContentUnmarshal
          Flag for recursion while generating attribute unmarshal.
private  ClassItem m_marshalAttributeMethod
          Generated marshal attribute method.
private  java.lang.String m_marshalAttributeName
          Name for marshal attribute method (null unless generation started).
private  ClassItem m_marshalContentMethod
          Generated marshal content method.
private  java.lang.String m_marshalContentName
          Name for marshal content method (null unless generation istarted).
private  java.lang.String m_marshalSignature
          Signature used for marshal methods.
private  ClassItem m_newInstanceMethod
          Generated new instance method.
private  ClassItem m_postSetMethod
          Postset method for object.
private  ClassItem m_preGetMethod
          Preget method for object.
private  ClassItem m_preSetMethod
          Preset method for object.
private  ClassItem m_unmarshalAttributeMethod
          Generated unmarshal attribute method.
private  java.lang.String m_unmarshalAttributeName
          Name for unmarshal attribute method (null unless generation started).
private  ClassItem m_unmarshalContentMethod
          Generated unmarshal content method.
private  java.lang.String m_unmarshalContentName
          Name for unmarshal content method (null unless generation started).
private  java.lang.String m_unmarshalSignature
          Signature used for unmarshal methods.
private static java.lang.String MARSHAL_ATTR_SUFFIX
           
private static java.lang.String MARSHAL_GETSTACKTOPMETHOD
           
private static java.lang.String[] MARSHAL_HOOK_SIGNATURES
           
private static java.lang.String MARSHAL_POPOBJECTMETHOD
           
private static java.lang.String MARSHAL_PUSHOBJECTMETHOD
           
private static java.lang.String MARSHAL_SUFFIX
           
private static java.lang.String MARSHALLING_CONTEXT
           
private static java.lang.String NEWINSTANCE_SUFFIX
           
private static java.lang.String POPOBJECT_SIGNATURE
           
private static java.lang.String PUSHOBJECT_SIGNATURE
           
private static org.apache.bcel.generic.Type[] SETSOURCE_ARGS
           
private static java.lang.String SETSOURCE_METHODNAME
           
private static java.lang.String SOURCE_TRACKING_INTERFACE
           
private static java.lang.String SOURCECOLUMN_FIELDNAME
           
private static java.lang.String SOURCECOLUMN_METHODNAME
           
private static java.lang.String SOURCEDOCUMENT_FIELDNAME
           
private static java.lang.String SOURCELINE_FIELDNAME
           
private static java.lang.String SOURCELINE_METHODNAME
           
private static java.lang.String SOURCENAME_METHODNAME
           
private static java.lang.String UNMARSHAL_ATTR_SUFFIX
           
private static java.lang.String UNMARSHAL_GETSTACKTOPMETHOD
           
private static java.lang.String[] UNMARSHAL_HOOK_SIGNATURES
           
private static java.lang.String UNMARSHAL_PARAMETER_SIGNATURE
           
private static java.lang.String UNMARSHAL_POPOBJECTMETHOD
           
private static java.lang.String UNMARSHAL_PUSHOBJECTMETHOD
           
private static java.lang.String UNMARSHAL_PUSHTRACKEDOBJECTMETHOD
           
private static java.lang.String UNMARSHAL_SUFFIX
           
private static java.lang.String UNMARSHALLING_CONTEXT
           
 
Fields inherited from class org.jibx.binding.def.PassThroughComponent
m_component
 
Constructor Summary
ObjectBinding(IContainer contain, IContextObj objc, java.lang.String type, java.lang.String fact, java.lang.String pres, java.lang.String posts, java.lang.String pget, java.lang.String ctype)
          Constructor.
ObjectBinding(IContainer contain, ObjectBinding base)
          Copy constructor.
ObjectBinding(ObjectBinding base)
          Abstract binding copy constructor.
 
Method Summary
private  java.lang.String fullMethodName(ClassItem item)
          Construct fully-qualified class and method name for constructed method.
private  java.lang.String fullMethodName(ContextMethodBuilder mb)
          Construct fullly-qualified class and method name for method under construction.
 void genAttributeMarshal(ContextMethodBuilder mb)
          Generate attribute marshalling code.
 void genAttributeUnmarshal(ContextMethodBuilder mb)
          Generate attribute unmarshalling code.
 void genContentMarshal(ContextMethodBuilder mb)
          Generate element or text marshalling code.
 void genContentUnmarshal(ContextMethodBuilder mb)
          Generate element or text unmarshalling code.
 void genLoadId(ContextMethodBuilder mb)
          Generate code to load ID value of instance to stack.
private  void genMarshalAttributeCall(ContextMethodBuilder mb)
          Generate call to attribute marshal method for object.
private  void genMarshalCall(java.lang.String name, ContextMethodBuilder mb)
          Generate call to a constructed marshal method.
private  void genMarshalContentCall(ContextMethodBuilder mb)
          Generate call to content marshal method for object.
 void genNewInstance(ContextMethodBuilder mb)
          Generate code to create new instance of object.
private  void genNewInstanceCall(ContextMethodBuilder mb)
          Generate call to new instance creation method for object.
private  void genNewInstanceCode(ContextMethodBuilder mb)
          Generate code to create an instance of the object for this mapping.
private  void genTrackSourceCode()
          Generate code to handle unmarshal source location tracking.
private  void genUnmarshalAttributeCall(ContextMethodBuilder mb)
          Generate call to attribute unmarshal method for object.
private  void genUnmarshalCall(java.lang.String name, ContextMethodBuilder mb)
          Generate call to a constructed unmarshal method.
private  void genUnmarshalContentCall(ContextMethodBuilder mb)
          Generate call to content unmarshal method for object.
private  void genUserMethodCall(boolean in, ClassItem method, ContextMethodBuilder mb)
          Generate code for calling a user supplied method.
 BoundClass getBoundClass()
          Get class linked to binding element.
 java.lang.String getType()
          Get type expected by component.
 boolean hasId()
          Check if component defines an ID value for instances of context object.
 boolean isOptional()
          Check if component is an optional item.
 void print(int depth)
           
 boolean setIdChild(IComponent child)
          Set ID property.
 void setLinkages()
          Establish and validate linkages between binding components.
 
Methods inherited from class org.jibx.binding.def.PassThroughComponent
genAttrPresentTest, genContentPresentTest, getWrapperName, hasAttribute, hasContent, setWrappedComponent
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.jibx.binding.def.IComponent
genAttrPresentTest, genContentPresentTest, getWrapperName, hasAttribute, hasContent
 

Field Detail

MARSHAL_HOOK_SIGNATURES

private static final java.lang.String[] MARSHAL_HOOK_SIGNATURES

FACTORY_HOOK_SIGNATURES

private static final java.lang.String[] FACTORY_HOOK_SIGNATURES

UNMARSHAL_HOOK_SIGNATURES

private static final java.lang.String[] UNMARSHAL_HOOK_SIGNATURES

UNMARSHAL_GETSTACKTOPMETHOD

private static final java.lang.String UNMARSHAL_GETSTACKTOPMETHOD
See Also:
Constant Field Values

MARSHAL_GETSTACKTOPMETHOD

private static final java.lang.String MARSHAL_GETSTACKTOPMETHOD
See Also:
Constant Field Values

GETSTACKTOP_SIGNATURE

private static final java.lang.String GETSTACKTOP_SIGNATURE
See Also:
Constant Field Values

MARSHALLING_CONTEXT

private static final java.lang.String MARSHALLING_CONTEXT
See Also:
Constant Field Values

UNMARSHALLING_CONTEXT

private static final java.lang.String UNMARSHALLING_CONTEXT
See Also:
Constant Field Values

UNMARSHAL_PARAMETER_SIGNATURE

private static final java.lang.String UNMARSHAL_PARAMETER_SIGNATURE
See Also:
Constant Field Values

UNMARSHAL_PUSHOBJECTMETHOD

private static final java.lang.String UNMARSHAL_PUSHOBJECTMETHOD
See Also:
Constant Field Values

UNMARSHAL_PUSHTRACKEDOBJECTMETHOD

private static final java.lang.String UNMARSHAL_PUSHTRACKEDOBJECTMETHOD
See Also:
Constant Field Values

MARSHAL_PUSHOBJECTMETHOD

private static final java.lang.String MARSHAL_PUSHOBJECTMETHOD
See Also:
Constant Field Values

PUSHOBJECT_SIGNATURE

private static final java.lang.String PUSHOBJECT_SIGNATURE
See Also:
Constant Field Values

UNMARSHAL_POPOBJECTMETHOD

private static final java.lang.String UNMARSHAL_POPOBJECTMETHOD
See Also:
Constant Field Values

MARSHAL_POPOBJECTMETHOD

private static final java.lang.String MARSHAL_POPOBJECTMETHOD
See Also:
Constant Field Values

POPOBJECT_SIGNATURE

private static final java.lang.String POPOBJECT_SIGNATURE
See Also:
Constant Field Values

NEWINSTANCE_SUFFIX

private static final java.lang.String NEWINSTANCE_SUFFIX
See Also:
Constant Field Values

UNMARSHAL_ATTR_SUFFIX

private static final java.lang.String UNMARSHAL_ATTR_SUFFIX
See Also:
Constant Field Values

MARSHAL_ATTR_SUFFIX

private static final java.lang.String MARSHAL_ATTR_SUFFIX
See Also:
Constant Field Values

UNMARSHAL_SUFFIX

private static final java.lang.String UNMARSHAL_SUFFIX
See Also:
Constant Field Values

MARSHAL_SUFFIX

private static final java.lang.String MARSHAL_SUFFIX
See Also:
Constant Field Values

SOURCE_TRACKING_INTERFACE

private static final java.lang.String SOURCE_TRACKING_INTERFACE
See Also:
Constant Field Values

SETSOURCE_METHODNAME

private static final java.lang.String SETSOURCE_METHODNAME
See Also:
Constant Field Values

SETSOURCE_ARGS

private static final org.apache.bcel.generic.Type[] SETSOURCE_ARGS

SOURCEDOCUMENT_FIELDNAME

private static final java.lang.String SOURCEDOCUMENT_FIELDNAME
See Also:
Constant Field Values

SOURCELINE_FIELDNAME

private static final java.lang.String SOURCELINE_FIELDNAME
See Also:
Constant Field Values

SOURCECOLUMN_FIELDNAME

private static final java.lang.String SOURCECOLUMN_FIELDNAME
See Also:
Constant Field Values

SOURCENAME_METHODNAME

private static final java.lang.String SOURCENAME_METHODNAME
See Also:
Constant Field Values

SOURCELINE_METHODNAME

private static final java.lang.String SOURCELINE_METHODNAME
See Also:
Constant Field Values

SOURCECOLUMN_METHODNAME

private static final java.lang.String SOURCECOLUMN_METHODNAME
See Also:
Constant Field Values

EMPTY_ARGS

private static final org.apache.bcel.generic.Type[] EMPTY_ARGS

m_container

private final IContainer m_container
Containing binding definition structure.


m_class

private BoundClass m_class
Class linked to mapping.


m_factoryMethod

private final ClassItem m_factoryMethod
Object factory method.


m_preSetMethod

private final ClassItem m_preSetMethod
Preset method for object.


m_postSetMethod

private final ClassItem m_postSetMethod
Postset method for object.


m_preGetMethod

private final ClassItem m_preGetMethod
Preget method for object.


m_createClass

private final ClassFile m_createClass
Type to be used for creating new instances.


m_newInstanceMethod

private ClassItem m_newInstanceMethod
Generated new instance method.


m_lockAttributeUnmarshal

private boolean m_lockAttributeUnmarshal
Flag for recursion while generating attribute unmarshal.


m_lockAttributeMarshal

private boolean m_lockAttributeMarshal
Flag for recursion while generating attribute marshal.


m_lockContentUnmarshal

private boolean m_lockContentUnmarshal
Flag for recursion while generating attribute unmarshal.


m_lockContentMarshal

private boolean m_lockContentMarshal
Flag for recursion while generating attribute marshal.


m_unmarshalSignature

private java.lang.String m_unmarshalSignature
Signature used for unmarshal methods.


m_unmarshalAttributeName

private java.lang.String m_unmarshalAttributeName
Name for unmarshal attribute method (null unless generation started).


m_unmarshalContentName

private java.lang.String m_unmarshalContentName
Name for unmarshal content method (null unless generation started).


m_isStaticUnmarshal

private boolean m_isStaticUnmarshal
Flag for static unmarshal methods.


m_isStaticMarshal

private boolean m_isStaticMarshal
Flag for static marshal methods.


m_marshalSignature

private java.lang.String m_marshalSignature
Signature used for marshal methods.


m_marshalAttributeName

private java.lang.String m_marshalAttributeName
Name for marshal attribute method (null unless generation started).


m_marshalContentName

private java.lang.String m_marshalContentName
Name for marshal content method (null unless generation istarted).


m_unmarshalAttributeMethod

private ClassItem m_unmarshalAttributeMethod
Generated unmarshal attribute method.


m_unmarshalContentMethod

private ClassItem m_unmarshalContentMethod
Generated unmarshal content method.


m_marshalAttributeMethod

private ClassItem m_marshalAttributeMethod
Generated marshal attribute method.


m_marshalContentMethod

private ClassItem m_marshalContentMethod
Generated marshal content method.


m_idChild

private IComponent m_idChild
Child supplying instance identifier value.


m_isThisBinding

private boolean m_isThisBinding
Flag for "this" reference, meaning that there's no separate object instance created.

Constructor Detail

ObjectBinding

public ObjectBinding(IContainer contain,
                     IContextObj objc,
                     java.lang.String type,
                     java.lang.String fact,
                     java.lang.String pres,
                     java.lang.String posts,
                     java.lang.String pget,
                     java.lang.String ctype)
              throws JiBXException
Constructor. This initializes the definition context to be the same as the parent's. Subclasses may change this definition context if appropriate.

Parameters:
contain - containing binding definition component
objc - current object context
type - fully qualified class name for bound object
fact - user new instance factory method
pres - user preset method for unmarshalling
posts - user postset method for unmarshalling
pget - user preget method for marshalling
ctype - type to use for creating new instance (null if not specified)
Throws:
JiBXException - if method not found

ObjectBinding

public ObjectBinding(ObjectBinding base)
Abstract binding copy constructor. This is used to create a variation of the object binding for a mapping which will be used for "this" references. The "this" reference handling differs only in the code generation, where it skips adding the source tracking interfaces and does not push an instance of the object on the marshalling or unmarshalling stack (since the object will already be there). This method is only to be used before code generation.

Parameters:
base - original object binding

ObjectBinding

public ObjectBinding(IContainer contain,
                     ObjectBinding base)
Copy constructor. This is used in handling abstract mappings, where the properties of the mapping definition object binding need to be copied for each use of that binding.

Parameters:
contain - binding definition component containing copy
Method Detail

genUserMethodCall

private void genUserMethodCall(boolean in,
                               ClassItem method,
                               ContextMethodBuilder mb)
Generate code for calling a user supplied method. The object methods support three signature variations, with no parameters, with the marshalling or unmarshalling context, or with the owning object.

Parameters:
in - flag for unmarshalling method
method - information for method being called
mb - method builder for generated code

genNewInstanceCode

private void genNewInstanceCode(ContextMethodBuilder mb)
                         throws JiBXException
Generate code to create an instance of the object for this mapping. This convenience method generates the actual code for creating an instance of an object. The generated code leaves the created object reference on the stack.

Parameters:
mb - method builder
Throws:
JiBXException - if error in generating code

genNewInstanceCall

private void genNewInstanceCall(ContextMethodBuilder mb)
                         throws JiBXException
Generate call to new instance creation method for object. This convenience method just generates code to call the generated new instance method added to the class definition.

Parameters:
mb - method builder
Throws:
JiBXException - if error in configuration

genTrackSourceCode

private void genTrackSourceCode()
                         throws JiBXException
Generate code to handle unmarshal source location tracking. This convenience method generates the member variables and method used to support setting the source location, the methods used to access the information, and also adds the appropriate interfaces to the class.

Throws:
JiBXException - if error in generating code

fullMethodName

private java.lang.String fullMethodName(ContextMethodBuilder mb)
Construct fullly-qualified class and method name for method under construction.

Parameters:
mb - method to be named
Returns:
fully-qualified class and method name

fullMethodName

private java.lang.String fullMethodName(ClassItem item)
Construct fully-qualified class and method name for constructed method.

Parameters:
item - method to be named
Returns:
fully-qualified class and method name

genUnmarshalCall

private void genUnmarshalCall(java.lang.String name,
                              ContextMethodBuilder mb)
Generate call to a constructed unmarshal method.

Parameters:
mb -

genMarshalCall

private void genMarshalCall(java.lang.String name,
                            ContextMethodBuilder mb)
Generate call to a constructed marshal method.

Parameters:
mb -

genUnmarshalAttributeCall

private void genUnmarshalAttributeCall(ContextMethodBuilder mb)
                                throws JiBXException
Generate call to attribute unmarshal method for object. This convenience method just generates code to call the generated unmarshal method added to the class definition. The code generated prior to this call must have loaded a reference to the object to be unmarshalled on the stack, and the generated code returns the (possibly different, in the case of arrays) object on the stack.

Parameters:
mb - method builder
Throws:
JiBXException - if error in configuration

genMarshalAttributeCall

private void genMarshalAttributeCall(ContextMethodBuilder mb)
                              throws JiBXException
Generate call to attribute marshal method for object. This convenience method just generates code to call the generated marshal method added to the class definition. The code generated prior to this call must have loaded a reference to the object to be marshalled on the stack.

Parameters:
mb - method builder
Throws:
JiBXException - if error in configuration

genUnmarshalContentCall

private void genUnmarshalContentCall(ContextMethodBuilder mb)
                              throws JiBXException
Generate call to content unmarshal method for object. This convenience method just generates code to call the generated unmarshal method added to the class definition. The code generated prior to this call must have loaded a reference to the object to be unmarshalled on the stack, and the generated code returns the (possibly different, in the case of arrays) object on the stack.

Parameters:
mb - method builder
Throws:
JiBXException - if error in configuration

genMarshalContentCall

private void genMarshalContentCall(ContextMethodBuilder mb)
                            throws JiBXException
Generate call to content marshal method for object. This convenience method just generates code to call the generated marshal method added to the class definition. The code generated prior to this call must have loaded a reference to the object to be marshalled on the stack.

Parameters:
mb - method builder
Throws:
JiBXException - if error in configuration

getBoundClass

public BoundClass getBoundClass()
Description copied from interface: IContextObj
Get class linked to binding element.

Specified by:
getBoundClass in interface IContextObj
Returns:
information for class linked by binding

setIdChild

public boolean setIdChild(IComponent child)
Description copied from interface: IContextObj
Set ID property. Tells the parent binding element that a particular child defines an ID property for the class linked to the parent.

Specified by:
setIdChild in interface IContextObj
Parameters:
child - child defining the ID property
Returns:
true if successful, false if ID already defined

isOptional

public boolean isOptional()
Description copied from interface: IComponent
Check if component is an optional item.

Specified by:
isOptional in interface IComponent
Overrides:
isOptional in class PassThroughComponent
Returns:
true if optional, false if required

genAttributeUnmarshal

public void genAttributeUnmarshal(ContextMethodBuilder mb)
                           throws JiBXException
Description copied from interface: IComponent
Generate attribute unmarshalling code. This is called within the code generation for the unmarshaller of the class associated with the containing element. It needs to generate the necessary code for handling the unmarshalling operation, leaving the unmarshalled object reference on the stack.

Specified by:
genAttributeUnmarshal in interface IComponent
Overrides:
genAttributeUnmarshal in class PassThroughComponent
Parameters:
mb - method builder
Throws:
JiBXException - if error in configuration

genAttributeMarshal

public void genAttributeMarshal(ContextMethodBuilder mb)
                         throws JiBXException
Description copied from interface: IComponent
Generate attribute marshalling code. This is called within the code generation for the marshaller of the class associated with the containing element. It needs to generate the necessary code for handling the marshalling operation, consuming the marshalled object reference from the stack.

Specified by:
genAttributeMarshal in interface IComponent
Overrides:
genAttributeMarshal in class PassThroughComponent
Parameters:
mb - method builder
Throws:
JiBXException - if error in configuration

genContentUnmarshal

public void genContentUnmarshal(ContextMethodBuilder mb)
                         throws JiBXException
Description copied from interface: IComponent
Generate element or text unmarshalling code. This is called within the code generation for the unmarshaller of the class associated with the containing element. It needs to generate the necessary code for handling the unmarshalling operation, leaving the unmarshalled object reference on the stack.

Specified by:
genContentUnmarshal in interface IComponent
Overrides:
genContentUnmarshal in class PassThroughComponent
Parameters:
mb - method builder
Throws:
JiBXException - if error in configuration

genContentMarshal

public void genContentMarshal(ContextMethodBuilder mb)
                       throws JiBXException
Description copied from interface: IComponent
Generate element or text marshalling code. This is called within the code generation for the marshaller of the class associated with the containing element. It needs to generate the necessary code for handling the marshalling operation, consuming the marshalled object reference from the stack.

Specified by:
genContentMarshal in interface IComponent
Overrides:
genContentMarshal in class PassThroughComponent
Parameters:
mb - method builder
Throws:
JiBXException - if error in configuration

genNewInstance

public void genNewInstance(ContextMethodBuilder mb)
                    throws JiBXException
Description copied from interface: IComponent
Generate code to create new instance of object. This is called within the code generation for the unmarshaller of the class associated with the containing element. It needs to generate the necessary code for creating an instance of the object to be unmarshalled, leaving the object reference on the stack.

Specified by:
genNewInstance in interface IComponent
Overrides:
genNewInstance in class PassThroughComponent
Parameters:
mb - method builder
Throws:
JiBXException - if error in configuration

getType

public java.lang.String getType()
Description copied from interface: IComponent
Get type expected by component.

Specified by:
getType in interface IComponent
Overrides:
getType in class PassThroughComponent
Returns:
fully qualified class name of expected type

hasId

public boolean hasId()
Description copied from interface: IComponent
Check if component defines an ID value for instances of context object.

Specified by:
hasId in interface IComponent
Overrides:
hasId in class PassThroughComponent
Returns:
true if ID value defined for instances, false if not

genLoadId

public void genLoadId(ContextMethodBuilder mb)
               throws JiBXException
Description copied from interface: IComponent
Generate code to load ID value of instance to stack. The generated code should assume that the top of the stack is the reference for the containing object. It must consume this and leave the actual ID value on the stack (as a String).

Specified by:
genLoadId in interface IComponent
Overrides:
genLoadId in class PassThroughComponent
Parameters:
mb - method builder
Throws:
JiBXException - if configuration error

setLinkages

public void setLinkages()
                 throws JiBXException
Description copied from interface: IComponent
Establish and validate linkages between binding components. This is called after the basic binding structures have been set up. All linkages between components must be resolved by this method, in order to prevent problems due to the order of definitions between components. This implies that each component must in turn call the same method for each child component. None of the other method calls defined by this interface are valid until after this call.

Specified by:
setLinkages in interface IComponent
Overrides:
setLinkages in class PassThroughComponent
Throws:
JiBXException - if error in configuration

print

public void print(int depth)
Specified by:
print in interface IComponent
Overrides:
print in class PassThroughComponent


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