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// **********************************************************************
//
// Copyright (c) 2003-2012 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
package IceMX;
public class MetricsHelper<T>
{
public static class AttributeResolver
{
private abstract class Resolver
{
Resolver(String name)
{
_name = name;
}
abstract Object resolve(Object obj) throws Exception;
String resolveImpl(Object obj)
{
try
{
Object result = resolve(obj);
if(result != null)
{
return result.toString();
}
return "";
}
catch(IllegalArgumentException ex)
{
throw ex;
}
catch(Exception ex)
{
ex.printStackTrace();
assert(false);
return null;
}
}
final String _name;
};
protected
AttributeResolver()
{
}
public String
resolve(MetricsHelper helper, String attribute)
{
Resolver resolver = _attributes.get(attribute);
if(resolver == null)
{
if(attribute.equals("none"))
{
return "";
}
String v = helper.defaultResolve(attribute);
if(v != null)
{
return v;
}
throw new IllegalArgumentException(attribute);
}
return resolver.resolveImpl(helper);
}
public void
add(String name, final java.lang.reflect.Method method)
{
_attributes.put(name, new Resolver(name)
{
public Object
resolve(Object obj) throws Exception
{
return method.invoke(obj);
}
});
}
public void
add(String name, final java.lang.reflect.Field field)
{
_attributes.put(name, new Resolver(name)
{
public Object
resolve(Object obj) throws Exception
{
return field.get(obj);
}
});
}
public void
add(final String name, final java.lang.reflect.Method method, final java.lang.reflect.Field field)
{
_attributes.put(name, new Resolver(name)
{
public Object
resolve(Object obj) throws Exception
{
Object o = method.invoke(obj);
if(o != null)
{
return field.get(o);
}
throw new IllegalArgumentException(name);
}
});
}
public void
add(final String name, final java.lang.reflect.Method method, final java.lang.reflect.Method subMethod)
{
_attributes.put(name, new Resolver(name)
{
public Object
resolve(Object obj) throws Exception
{
Object o = method.invoke(obj);
if(o != null)
{
return subMethod.invoke(o);
}
throw new IllegalArgumentException(name);
}
});
}
private java.util.Map<String, Resolver> _attributes = new java.util.HashMap<String, Resolver>();
};
protected
MetricsHelper(AttributeResolver attributes)
{
_attributes = attributes;
}
public String
resolve(String attribute)
{
return _attributes.resolve(this, attribute);
}
public void
initMetrics(T metrics)
{
// Override in specialized helpers.
}
protected String
defaultResolve(String attribute)
{
return null;
}
private AttributeResolver _attributes;
};
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