Examples of org.apache.qpid.qmf2.common.QmfQuery

org.apache.qpid.qmf2.common.SchemaObjectClass
.apache.org/qpid/qmfv2-api-proposal.html>QMF2 API Proposal and the QMF2 protocol that is specified at QMF Map Message Protocol in particular the use of the underscore to specify key names e.g. "_what", "_where", "_object_id", "_schema_id".
This implementation trusts the protocol specification more than the API specification as the underscores are more consistent with the rest of the protocol and the underscored variants are what have been observed when querying the broker ManagementAgent.
A QmfQuery may be constructed as either an "ID" query (to query for a specific ObjectId or SchemaClassId) or a "PREDICATE" query (to query based upon an expression). Note that QMF considers string arguments in boolean expressions to be names of data values in the target object. When evaluating a predicate expression, QMF will fetch the value of the named data item from each candidate target object. The value is then used in the boolean expression. In other words, QMF considers string arguments to be variables in the expression. In order to indicate that a string should be treated as a literal instead, the string must be quoted using the "quote" expression.
Examples
Assume a QmfData type defines fields named "name", "address" and "town". The following predicate expression matches any instance with a name field set to "tross", or any instance where the name field is "jross", the address field is "1313 Spudboy Lane" and the town field is "Utopia":
```
 ["or" ["eq" "name" ["quote" "tross"]] ["and" ["eq" "name" ["quote" "jross"]] ["eq" "address" ["quote" "1313 Spudboy Lane"]] ["eq" ["quote" "Utopia"] "town"] ] ] 
```
Assume a QmfData type with fields "name" and "age". A predicate to find all instances with name matching the regular expression "?ross" with an optional age field that is greater than the value 29 or less than 12 would be:
```
 ["and" ["re_match" "name" ["quote" "?ross"]] ["and" ["exists" "age"] ["or" ["gt" "age" 27] ["lt" "age" 12]] ] ] 
```
The Expression structure is illustrated below in the context of its relationship with QmfQuery. @author Fraser Adams

            query = new QmfQuery(QmfQueryTarget.OBJECT, wasp.getObjectId());
            results = evaluateDataQuery(query);
            displayResults(results);


            System.out.println("\nlooking up mammal objects");
            query = new QmfQuery(QmfQueryTarget.OBJECT, new SchemaClassId("mammal"));
            results = evaluateDataQuery(query);
            displayResults(results);


            System.out.println("\nlooking up everything in package com.fadams.qmf2");
            query = new QmfQuery(QmfQueryTarget.OBJECT, new SchemaClassId("com.fadams.qmf2", null));
            results = evaluateDataQuery(query);
            displayResults(results);




            System.out.println("\nQuery for all mammals with more than two legs");

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        }
    }


    public void registerObjectClass(SchemaObjectClass schema)
    {
        SchemaClassId classId = schema.getClassId();
        _schemaCache.put(classId, schema);
    }

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        _schemaCache.put(classId, schema);
    }


    public void addObject(QmfAgentData object) throws QmfException
    {
        SchemaClassId classId = object.getSchemaClassId();
        SchemaClass schema = _schemaCache.get(classId);


        // Try to create an objectName using the set of property names that have been specified as idNames in the schema
        StringBuilder buf = new StringBuilder();
        if (schema != null && schema instanceof SchemaObjectClass)
        {
            String[] idNames = ((SchemaObjectClass)schema).getIdNames();
            for (String name : idNames)
            {
                buf.append(object.getStringValue(name));
            }
        }
        String objectName = buf.toString();


        // If the schema hasn't given any help we use a UUID
        if (objectName.length() == 0) objectName = UUID.randomUUID().toString();


        // Finish up the name by incorporating package and class names
        objectName = classId.getPackageName() + ":" + classId.getClassName() + ":" + objectName;


        // Now we've got a good name for the object we create it's ObjectId and add that to the object
        ObjectId addr = new ObjectId("test"/*name*/, objectName, 0/*epoch*/);
        object.setObjectId(addr);

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        _childSchema = new SchemaObjectClass(packageName, "child");
        _childSchema.addProperty(new SchemaProperty("name", QmfType.TYPE_STRING));
        _childSchema.setIdNames("name");
    
        // Declare the event class
        _eventSchema = new SchemaEventClass(packageName, "event");
        _eventSchema.addProperty(new SchemaProperty("text", QmfType.TYPE_STRING));


        System.out.println("AgentTest Schema classes initialised OK");


        _agent.registerObjectClass(_exceptionSchema);

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                    for (Map content : mapResults)
                    {
                        SchemaClass schema = new SchemaObjectClass(content);
                        if (schema.getClassId().getType().equals("_event"))
                        {
                            schema = new SchemaEventClass(content);
                        }
//schema.listValues();
                        results.add(schema);
                    }
                }

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            // Declare the child class
            SchemaObjectClass child = new SchemaObjectClass(packageName, "child");
            child.addProperty(new SchemaProperty("name", QmfType.TYPE_STRING));
    
            // Declare the event class
            SchemaEventClass event = new SchemaEventClass(packageName, "event");
            event.addProperty(new SchemaProperty("text", QmfType.TYPE_STRING));


            System.out.println("Test3 Schema classes initialised OK");


            // Now we create new instance of each class from the map encodings and list the values
            // to check everything looks OK.


            System.out.println("Test3 testing serialisation of exception schema");
            SchemaObjectClass exceptionFromMap = new SchemaObjectClass(exception.mapEncode());
            exceptionFromMap.listValues();
            System.out.println();


            System.out.println("Test3 testing serialisation of control schema");
            SchemaObjectClass controlFromMap = new SchemaObjectClass(control.mapEncode());
            controlFromMap.listValues();
            System.out.println();


            System.out.println("Test3 testing serialisation of child schema");
            SchemaObjectClass childFromMap = new SchemaObjectClass(child.mapEncode());
            childFromMap.listValues();
            System.out.println();


            System.out.println("Test3 testing serialisation of event schema");
            SchemaEventClass eventFromMap = new SchemaEventClass(event.mapEncode());
            eventFromMap.listValues();
            System.out.println();


        }
        catch (QmfException qmfe)
        {

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        _controlSchema.addProperty(new SchemaProperty("state", QmfType.TYPE_STRING));
        _controlSchema.addProperty(new SchemaProperty("methodCount", QmfType.TYPE_INT));
        _controlSchema.addProperty(new SchemaProperty("offset", QmfType.TYPE_INT));
        _controlSchema.setIdNames("state");


        SchemaMethod stopMethod = new SchemaMethod("stop", "Stop Agent");
        stopMethod.addArgument(new SchemaProperty("message", QmfType.TYPE_STRING, "{dir:IN}"));
        _controlSchema.addMethod(stopMethod);


        SchemaMethod echoMethod = new SchemaMethod("echo", "Echo Arguments");
        echoMethod.addArgument(new SchemaProperty("message", QmfType.TYPE_STRING, "{dir:INOUT}"));
        _controlSchema.addMethod(echoMethod);


        SchemaMethod eventMethod = new SchemaMethod("event", "Raise an Event");
        eventMethod.addArgument(new SchemaProperty("text", QmfType.TYPE_STRING, "{dir:IN}"));
        eventMethod.addArgument(new SchemaProperty("severity", QmfType.TYPE_INT, "{dir:IN}"));
        _controlSchema.addMethod(eventMethod);


        SchemaMethod failMethod = new SchemaMethod("fail", "Expected to Fail");
        failMethod.addArgument(new SchemaProperty("useString", QmfType.TYPE_BOOL, "{dir:IN}"));
        failMethod.addArgument(new SchemaProperty("stringVal", QmfType.TYPE_STRING, "{dir:IN}"));
        failMethod.addArgument(new SchemaProperty("details", QmfType.TYPE_MAP, "{dir:IN}"));
        _controlSchema.addMethod(failMethod);


        SchemaMethod createMethod = new SchemaMethod("create_child", "Create Child Object");
        createMethod.addArgument(new SchemaProperty("name", QmfType.TYPE_STRING, "{dir:IN}"));
        createMethod.addArgument(new SchemaProperty("childAddr", QmfType.TYPE_MAP, "{dir:OUT}"));
        _controlSchema.addMethod(createMethod);


        // Declare the child class
        _childSchema = new SchemaObjectClass(packageName, "child");
        _childSchema.addProperty(new SchemaProperty("name", QmfType.TYPE_STRING));

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            // Declare a control object to test methods against.
            SchemaObjectClass control = new SchemaObjectClass(packageName, "control");
            control.addProperty(new SchemaProperty("state", QmfType.TYPE_STRING));
            control.addProperty(new SchemaProperty("methodCount", QmfType.TYPE_INT));


            SchemaMethod stopMethod = new SchemaMethod("stop", "Stop Agent");
            stopMethod.addArgument(new SchemaProperty("message", QmfType.TYPE_STRING));
            control.addMethod(stopMethod);


            SchemaMethod echoMethod = new SchemaMethod("echo", "Echo Arguments");
            echoMethod.addArgument(new SchemaProperty("sequence", QmfType.TYPE_INT, "{dir:INOUT}"));
            echoMethod.addArgument(new SchemaProperty("map", QmfType.TYPE_MAP, "{dir:INOUT}"));
            control.addMethod(echoMethod);


            SchemaMethod eventMethod = new SchemaMethod("event", "Raise an Event");
            eventMethod.addArgument(new SchemaProperty("text", QmfType.TYPE_STRING, "{dir:IN}"));
            eventMethod.addArgument(new SchemaProperty("severity", QmfType.TYPE_INT, "{dir:IN}"));
            control.addMethod(eventMethod);


            SchemaMethod failMethod = new SchemaMethod("fail", "Expected to Fail");
            failMethod.addArgument(new SchemaProperty("useString", QmfType.TYPE_BOOL, "{dir:IN}"));
            failMethod.addArgument(new SchemaProperty("stringVal", QmfType.TYPE_STRING, "{dir:IN}"));
            failMethod.addArgument(new SchemaProperty("details", QmfType.TYPE_MAP, "{dir:IN}"));
            control.addMethod(failMethod);


            SchemaMethod createMethod = new SchemaMethod("create_child", "Create Child Object");
            createMethod.addArgument(new SchemaProperty("name", QmfType.TYPE_STRING, "{dir:IN}"));
            createMethod.addArgument(new SchemaProperty("childAddr", QmfType.TYPE_MAP, "{dir:OUT}"));
            control.addMethod(createMethod);


            // Declare the child class
            SchemaObjectClass child = new SchemaObjectClass(packageName, "child");
            child.addProperty(new SchemaProperty("name", QmfType.TYPE_STRING));

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        // Declare a control object to test methods against.
        _controlSchema = new SchemaObjectClass(packageName, "control");
        _controlSchema.addProperty(new SchemaProperty("name", QmfType.TYPE_STRING));
        _controlSchema.setIdNames("name");


        SchemaMethod createMethod = new SchemaMethod("processPayload", "Process a large payload");
        createMethod.addArgument(new SchemaProperty("parameter", QmfType.TYPE_STRING, "{dir:IN}"));
        createMethod.addArgument(new SchemaProperty("return", QmfType.TYPE_STRING, "{dir:OUT}"));
        _controlSchema.addMethod(createMethod);
 
        System.out.println("BigPayloadAgentTest Schema classes initialised OK");


        _agent.registerObjectClass(_controlSchema);

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                if (AMQPMessage.isAMQPList(response))
                {
                    List<Map> mapResults = AMQPMessage.getList(response);
                    for (Map content : mapResults)
                    {
                        SchemaClass schema = new SchemaObjectClass(content);
                        if (schema.getClassId().getType().equals("_event"))
                        {
                            schema = new SchemaEventClass(content);
                        }
//schema.listValues();
                        results.add(schema);

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