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/* -*- C++ -*- */
// ========================================================================
// $Id$
//
// = FILENAME
// Property_Evaluator.java
//
// = AUTHOR
// Seth Widoff <sbw1@cs.wustl.edu>
//
// ========================================================================
import org.omg.CORBA.*;
import CosTrading.*;
import CosTradingDynamic.*;
import TAO_Sequences.*;
import TAO_VR.*;
/**
* This is a Java port of the TAO_Property_Evaluator class in the TAO
* trading service implementation.
*/
public class Property_Evaluator
{
private Property[] props_;
private boolean supports_dp_ = true;
/**
* Construct an instance of TAO_Property_Evaluator that operates on
* a PropertySeq, <properties>.
*/
Property_Evaluator (Property[] properties)
{
this.props_ = properties;
}
/**
* Construct an instance of TAO_Property_Evaluator that operates on
* an <offer>.
*/
public Property_Evaluator (Offer offer)
{
this.props_ = offer.properties;
}
/**
* Disable or enable the evaluation of dynamic properties.
*/
public void allow_dynamic_properties (boolean toggle)
{
this.supports_dp_ = toggle;
}
/**
* Returns true if the property at index <index> is dynamic. Returns a
* 0 when the index is out of bounds.
*/
public boolean is_dynamic_property (int index)
{
boolean return_value = false;
int num_properties = this.props_.length;
if (index >= 0 && index < num_properties)
return_value = Property_Evaluator.is_dynamic_property (this.props_[index]);
return return_value;
}
public static boolean is_dynamic_property (Property prop)
{
boolean return_value = false;
Any value = prop.value;
TypeCode type = value.type ();
// Compare the type of the Any contents with the typecode
// for a dynamic property structure.
if (type.equal (DynamicPropHelper.type ()))
return_value = true;
return return_value;
}
/**
* Returns value of the property whose index is <index>. If the
* property at that index is dynamic and the trader supports dynamic
* properties, then the property_value method will obtain the value
* of the dynamic property using the evalDP method on the
* CosTradingDynamic::DynamicPropEval interface, passing on a
* CosTradingDynamic::DPEvalFailure exception on failure. If the
* property index is undefined, the method returns a null pointer.
*/
public Any property_value (int index, ORB orb)
throws DPEvalFailure
{
Any return_value = null;
int num_properties = this.props_.length;
if (index >= 0 && index < num_properties)
{
return_value =
Property_Evaluator.property_value (this.props_[index], orb);
}
return return_value;
}
public static Any property_value (Property prop, ORB orb)
throws DPEvalFailure
{
Any prop_value = null;
if (! Property_Evaluator.is_dynamic_property (prop))
prop_value = prop.value;
else
{
DynamicProp dp_struct =
DynamicPropHelper.extract (prop.value);
String prop_name = prop.name;
// This is because of the bug in TAO:
// Now we extract the object reference from the dynamic
// property structure.
org.omg.CORBA.Object obj =
orb.string_to_object (dp_struct.eval_if);
DynamicPropEval dp_eval = DynamicPropEvalHelper.narrow (obj);
if (dp_eval != null)
{
prop_value = dp_eval.evalDP (prop_name,
dp_struct.returned_type,
dp_struct.extra_info);
}
else
{
throw new DPEvalFailure (prop_name,
dp_struct.returned_type,
dp_struct.extra_info);
}
}
return prop_value;
}
/**
* Returns the type of the property whose index is <index>. If the
* property is dynamic and the trader supports dynamic properties,
* then the method returns the <returned_type> field of the
* CosTradingDynamic::DynamicProp struct associated with the
* property name. If the index is out of bounds, the method returns
* a null pointer (that is, 0).
*/
public TypeCode property_type (int index)
{
TypeCode prop_type = null;
if (! this.is_dynamic_property (index))
prop_type = this.props_[index].value.type ();
else
{
Any value = this.props_[index].value;
DynamicProp dp_struct = DynamicPropHelper.extract (value);
prop_type = dp_struct.returned_type;
}
return prop_type;
}
public String property_to_string (int index, ORB orb)
throws DPEvalFailure
{
String return_value = null;
Any any_value = this.property_value (index, orb);
TypeCode type = any_value.type ();
int kind = type.kind ().value ();
if (kind == TCKind._tk_null)
return_value = "Null";
else if (kind == TCKind._tk_void)
return_value = "Void";
else if (kind == TCKind._tk_short)
return_value = String.valueOf (any_value.extract_short ());
else if (kind == TCKind._tk_long)
return_value = String.valueOf (any_value.extract_long ());
else if (kind == TCKind._tk_ushort)
return_value = String.valueOf (any_value.extract_ushort ());
else if (kind == TCKind._tk_ulong)
return_value = String.valueOf (any_value.extract_ulong ());
else if (kind == TCKind._tk_float)
return_value = String.valueOf (any_value.extract_float ());
else if (kind == TCKind._tk_double)
return_value = String.valueOf (any_value.extract_double ());
else if (kind == TCKind._tk_boolean)
return_value = String.valueOf (any_value.extract_boolean ());
else if (kind == TCKind._tk_char)
return_value = String.valueOf (any_value.extract_char ());
else if (kind == TCKind._tk_string)
return_value = any_value.extract_string ();
else if (type.equal (StringSeqHelper.type ()))
{
System.out.println ("Printing string sequence.");
String[] str_seq = StringSeqHelper.extract (any_value);
for (int length = str_seq.length, i = 0; i < length; i++)
return_value = str_seq[i] + " ";
}
else if (type.equal (ULongSeqHelper.type ()))
{
System.out.println ("Printing ulong sequence.");
int[] ulong_seq = ULongSeqHelper.extract (any_value);
for (int length = ulong_seq.length, i = 0; i < length; i++)
return_value = ulong_seq[i] + " ";
}
else
System.out.println ("TCKind" + kind);
return return_value;
}
}
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