Examples of org.apache.marmotta.kiwi.reasoner.persistence.KiWiReasoningConnection.query()

org.apache.marmotta.kiwi.reasoner.persistence.KiWiReasoningConnection.query()
Evaluate a query on the triple store. The query parameters passed to the method call are translated into database queries in HQL and directly evaluated by a single database query that yields the query bindings.
The query patterns may share variable fields, in which case the database query will evaluate a join. In case the optional parameter is true, the database query will succeed even if the query does not yield a value. @param patterns the set of patterns to query; patterns are considered to be connected by AND;occurrences of the same variable in multiple patterns will be evaluated as a join @param initialBindings initial bindings of variable fields may be used in case some bindings arealready available to further restrict the results; the purpose of this parameter is to support query-by-example queries as well as to speed up e.g. incremental reasoning @param filters a set of filters to apply to the result before returning the bindings; dependingon the kind of filter, filtering will be carried out by the database or in memory @param orderBy list of variables by whose bindings the result rows should be ordered; variablesat the beginning of the list take precedence over variables that are further behind @param optional allow variables to be unbound; if this parameter is set, at least one variableneeds to give a result @return a list of bindings matching the query patterns and filters, ordered by the specifiedvariables and offset and limited by the parameters given

        try {


            // if there are further patterns, evaluate them; if the matched pattern was the only pattern, then
            // simply take the match as binding
            if(body.size() > 0) {
                bodyResult = connection.query(body,match,null,null,true);
            } else if(match != null) {
                bodyResult = new SingletonIteration<QueryResult, SQLException>(match);
            } else {
                bodyResult = new EmptyIteration<QueryResult, SQLException>();
            }

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        Literal object = v.createLiteral(OBJECT3);


        Pattern p = new Pattern(new ResourceField(subject), new ResourceField(predicate), new LiteralField(object));
        KiWiReasoningConnection connection = rpersistence.getConnection();
        try {
            List<QueryResult> results = asList(connection.query(Collections.singleton(p), null, null, null, true));
            Assert.assertEquals(1, results.size());
            Assert.assertEquals(1,results.get(0).getJustifications().size());


            KiWiTriple justification = results.get(0).getJustifications().iterator().next();
            Assert.assertEquals(subject, justification.getSubject());

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        URI predicate = v.createURI(PREDICATE2);


        Pattern p = new Pattern(new VariableField("X"), new ResourceField(predicate), new VariableField("Y"));
        KiWiReasoningConnection connection = rpersistence.getConnection();
        try {
            List<QueryResult> results = asList(connection.query(Collections.singleton(p), null, null, null, true));
            Assert.assertEquals(3, results.size());


            for(int i=0; i<3; i++) {
                Assert.assertEquals(1,results.get(i).getJustifications().size());

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        Pattern p1 = new Pattern(x, new ResourceField(predicate1), y);
        Pattern p2 = new Pattern(y, new ResourceField(predicate1), z);
        KiWiReasoningConnection connection = rpersistence.getConnection();
        try {
            List<QueryResult> results = asList(connection.query(ImmutableSet.of(p1,p2), null, null, null, true));
            Assert.assertEquals(1, results.size());
            Assert.assertEquals(2, results.get(0).getJustifications().size());




            Assert.assertEquals(SUBJECT1, results.get(0).getBindings().get(x).stringValue());

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        try {


            // if there are further patterns, evaluate them; if the matched pattern was the only pattern, then
            // simply take the match as binding
            if(body.size() > 0) {
                bodyResult = connection.query(body,match,null,null,true);
            } else if(match != null) {
                bodyResult = new SingletonIteration<QueryResult, SQLException>(match);
            } else {
                bodyResult = new EmptyIteration<QueryResult, SQLException>();
            }

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            try {


                // if there are further patterns, evaluate them; if the matched pattern was the only pattern, then
                // simply take the match as binding
                if(body.size() > 0) {
                    bodyResult = connection.query(body,match,null,null,true);
                } else if(match != null) {
                    bodyResult = new SingletonIteration<QueryResult, SQLException>(match);
                } else {
                    bodyResult = new EmptyIteration<QueryResult, SQLException>();
                }

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        Literal object = v.createLiteral(OBJECT3);


        Pattern p = new Pattern(new ResourceField(subject), new ResourceField(predicate), new LiteralField(object));
        KiWiReasoningConnection connection = rpersistence.getConnection();
        try {
            List<QueryResult> results = asList(connection.query(Collections.singleton(p), null, null, null, true));
            Assert.assertEquals(1, results.size());
            Assert.assertEquals(1,results.get(0).getJustifications().size());


            KiWiTriple justification = results.get(0).getJustifications().iterator().next();
            Assert.assertEquals(subject, justification.getSubject());

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        URI predicate = v.createURI(PREDICATE2);


        Pattern p = new Pattern(new VariableField("X"), new ResourceField(predicate), new VariableField("Y"));
        KiWiReasoningConnection connection = rpersistence.getConnection();
        try {
            List<QueryResult> results = asList(connection.query(Collections.singleton(p), null, null, null, true));
            Assert.assertEquals(3, results.size());


            for(int i=0; i<3; i++) {
                Assert.assertEquals(1,results.get(i).getJustifications().size());

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        Pattern p1 = new Pattern(x, new ResourceField(predicate1), y);
        Pattern p2 = new Pattern(y, new ResourceField(predicate1), z);
        KiWiReasoningConnection connection = rpersistence.getConnection();
        try {
            List<QueryResult> results = asList(connection.query(ImmutableSet.of(p1,p2), null, null, null, true));
            Assert.assertEquals(1, results.size());
            Assert.assertEquals(2, results.get(0).getJustifications().size());




            Assert.assertEquals(SUBJECT1, results.get(0).getBindings().get(x).stringValue());

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