Java MapBindingSet类代码示例

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Override
public void update(final AggregationElement aggregation, final AggregationState state, final VisibilityBindingSet childBindingSet) {
    checkArgument(aggregation.getAggregationType() == AggregationType.MIN, "The MinFunction only accepts MIN AggregationElements.");
    requireNonNull(state);
    requireNonNull(childBindingSet);

    // Only update the min if the child contains the binding that we are finding the min value for.
    final String aggregatedName = aggregation.getAggregatedBindingName();
    if(childBindingSet.hasBinding(aggregatedName)) {
        final MapBindingSet result = state.getBindingSet();
        final String resultName = aggregation.getResultBindingName();
        final boolean newBinding = !result.hasBinding(resultName);

        Value min;
        if(newBinding) {
            min = childBindingSet.getValue(aggregatedName);
        } else {
            final Value oldMin = result.getValue(resultName);
            final Value chidlMin = childBindingSet.getValue(aggregatedName);
            min = compare.compare(chidlMin, oldMin) < 0 ? chidlMin : oldMin;
        }

        result.addBinding(resultName, min);
    }
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Override
public void update(final AggregationElement aggregation, final AggregationState state, final VisibilityBindingSet childBindingSet) {
    checkArgument(aggregation.getAggregationType() == AggregationType.MAX, "The MaxFunction only accepts MAX AggregationElements.");
    requireNonNull(state);
    requireNonNull(childBindingSet);

    // Only update the max if the child contains the binding that we are finding the max value for.
    final String aggregatedName = aggregation.getAggregatedBindingName();
    if(childBindingSet.hasBinding(aggregatedName)) {
        final MapBindingSet result = state.getBindingSet();
        final String resultName = aggregation.getResultBindingName();
        final boolean newBinding = !result.hasBinding(resultName);

        Value max;
        if(newBinding) {
            max = childBindingSet.getValue(aggregatedName);
        } else {
            final Value oldMax = result.getValue(resultName);
            final Value childMax = childBindingSet.getValue(aggregatedName);
            max = compare.compare(childMax, oldMax) > 0 ? childMax : oldMax;
        }

        result.addBinding(resultName, max);
    }
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Override
public void update(final AggregationElement aggregation, final AggregationState state, final VisibilityBindingSet childBindingSet) {
    checkArgument(aggregation.getAggregationType() == AggregationType.COUNT, "The CountFunction only accepts COUNT AggregationElements.");
    requireNonNull(state);
    requireNonNull(childBindingSet);

    // Only add one to the count if the child contains the binding that we are counting.
    final String aggregatedName = aggregation.getAggregatedBindingName();
    if(childBindingSet.hasBinding(aggregatedName)) {
        final MapBindingSet result = state.getBindingSet();
        final String resultName = aggregation.getResultBindingName();
        final boolean newBinding = !result.hasBinding(resultName);

        if(newBinding) {
            // Initialize the binding.
            result.addBinding(resultName, new IntegerLiteralImpl(BigInteger.ONE));
        } else {
            // Update the existing binding.
            final Literal count = (Literal) result.getValue(resultName);
            final BigInteger updatedCount = count.integerValue().add( BigInteger.ONE );
            result.addBinding(resultName, new IntegerLiteralImpl(updatedCount));
        }
    }
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Test
public void newLeftResult_noRightMatches() {
    final IterativeJoin leftOuterJoin = new LeftOuterJoin();

    // There is a new left result.
    final MapBindingSet mapLeftResult = new MapBindingSet();
    mapLeftResult.addBinding("name", vf.createLiteral("Bob"));
    final VisibilityBindingSet newLeftResult = new VisibilityBindingSet(mapLeftResult);

    // There are no right results that join with the left result.
    final Iterator<VisibilityBindingSet> rightResults= new ArrayList<VisibilityBindingSet>().iterator();

    // Therefore, the left result is a new join result.
    final Iterator<VisibilityBindingSet> newJoinResultsIt = leftOuterJoin.newLeftResult(newLeftResult, rightResults);

    final Set<BindingSet> newJoinResults = new HashSet<>();
    while(newJoinResultsIt.hasNext()) {
        newJoinResults.add( newJoinResultsIt.next() );
    }

    final Set<BindingSet> expected = Sets.<BindingSet>newHashSet( newLeftResult );

    assertEquals(expected, newJoinResults);
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
/**
 * This Projection enumerates all of the variables that were in the query, none of them are anonymous, and
 * none of them insert constants.
 */
@Test
public void changesNothing() throws Exception {
    // Read the projection object from a SPARQL query.
    final Projection projection = getProjection(
            "SELECT ?person ?employee ?business " +
            "WHERE { " +
                "?person <urn:talksTo> ?employee . " +
                "?employee <urn:worksAt> ?business . " +
            "}");

    // Create a Binding Set that contains the result of the WHERE clause.
    final ValueFactory vf = new ValueFactoryImpl();
    final MapBindingSet bs = new MapBindingSet();
    bs.addBinding("person", vf.createURI("urn:Alice"));
    bs.addBinding("employee", vf.createURI("urn:Bob"));
    bs.addBinding("business", vf.createURI("urn:TacoJoint"));
    final VisibilityBindingSet original = new VisibilityBindingSet(bs, "a|b");

    // Execute the projection.
    final VisibilityBindingSet result = ProjectionEvaluator.make(projection).project(original);
    assertEquals(original, result);
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Test
public void matches() throws Exception {
    // Read the filter object from a SPARQL query.
    final Filter filter = getFilter(
            "SELECT * " +
            "WHERE { " +
                "FILTER(?age < 10)" +
                "?person <urn:age> ?age " +
            "}");

    // Create the input binding set.
    final ValueFactory vf = new ValueFactoryImpl();
    final MapBindingSet bs = new MapBindingSet();
    bs.addBinding("person", vf.createURI("urn:Alice"));
    bs.addBinding("age", vf.createLiteral(9));
    final VisibilityBindingSet visBs = new VisibilityBindingSet(bs);

    // Test the evaluator.
    assertTrue( FilterEvaluator.make(filter).filter(visBs) );
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Test
public void doesNotMatch() throws Exception {
    // Read the filter object from a SPARQL query.
    final Filter filter = getFilter(
            "SELECT * " +
            "WHERE { " +
                "FILTER(?age < 10)" +
                "?person <urn:age> ?age " +
            "}");

    // Create the input binding set.
    final ValueFactory vf = new ValueFactoryImpl();
    final MapBindingSet bs = new MapBindingSet();
    bs.addBinding("person", vf.createURI("urn:Alice"));
    bs.addBinding("age", vf.createLiteral(11));
    final VisibilityBindingSet visBs = new VisibilityBindingSet(bs);

    // Test the evaluator.
    assertFalse( FilterEvaluator.make(filter).filter(visBs) );
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Test
public void hashcode() {
    // Create a BindingSet, decorate it, and grab its hash code.
    final ValueFactory vf = new ValueFactoryImpl();
    final MapBindingSet bSet = new MapBindingSet();
    bSet.addBinding("name", vf.createLiteral("alice"));

    final VisibilityBindingSet visSet = new VisibilityBindingSet(bSet);
    final int origHash = visSet.hashCode();

    // Add another binding to the binding set and grab the new hash code.
    bSet.addBinding("age", vf.createLiteral(37));
    final int updatedHash = visSet.hashCode();

    // Show those hashes are different.
    assertNotEquals(origHash, updatedHash);
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Test
public void unaryResult() {
    // Create the input binding set.
    final ValueFactory vf = new ValueFactoryImpl();
    final MapBindingSet bindingSet = new MapBindingSet();
    bindingSet.addBinding("subject", vf.createURI("urn:Alice"));
    bindingSet.addBinding("predicate", vf.createURI("urn:age"));
    bindingSet.addBinding("object", vf.createLiteral(34));
    final VisibilityBindingSet visBs = new VisibilityBindingSet(bindingSet, "a");

    // Mock the processor context that will be invoked.
    final ProcessorContext context = mock(ProcessorContext.class);

    // Run the test.
    final StatementOutputFormatter formatter = new StatementOutputFormatter();
    formatter.init(context);
    formatter.process("key", ProcessorResult.make(new UnaryResult(visBs)));

    // Verify the mock was invoked with the expected output.
    final VisibilityStatement expectedStmt = new VisibilityStatement(vf.createStatement(
            vf.createURI("urn:Alice"),
            vf.createURI("urn:age"),
            vf.createLiteral(34)), "a");
    verify(context, times(1)).forward(eq("key"), eq(expectedStmt));
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Test
public void min() throws Exception {
    // A query that finds the minimum price for an item within the inventory.
    final String sparql =
            "SELECT (min(?price) as ?minPrice) { " +
                "?item <urn:price> ?price . " +
            "}";

    // Create the Statements that will be loaded into Rya.
    final ValueFactory vf = new ValueFactoryImpl();
    final Collection<Statement> statements = Sets.newHashSet(
            vf.createStatement(vf.createURI("urn:apple"), vf.createURI("urn:price"), vf.createLiteral(2.50)),
            vf.createStatement(vf.createURI("urn:gum"), vf.createURI("urn:price"), vf.createLiteral(0.99)),
            vf.createStatement(vf.createURI("urn:sandwich"), vf.createURI("urn:price"), vf.createLiteral(4.99)));

    // Create the PCJ in Fluo and load the statements into Rya.
    final String pcjId = loadDataAndCreateQuery(sparql, statements);

    // Create the expected results of the SPARQL query once the PCJ has been computed.
    final MapBindingSet expectedResult = new MapBindingSet();
    expectedResult.addBinding("minPrice", vf.createLiteral(0.99));

    // Ensure the last result matches the expected result.
    final VisibilityBindingSet result = readLastResult(pcjId);
    assertEquals(expectedResult, result);
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Test
public void max() throws Exception {
    // A query that finds the maximum price for an item within the inventory.
    final String sparql =
            "SELECT (max(?price) as ?maxPrice) { " +
                "?item <urn:price> ?price . " +
            "}";

    // Create the Statements that will be loaded into Rya.
    final ValueFactory vf = new ValueFactoryImpl();
    final Collection<Statement> statements = Sets.newHashSet(
            vf.createStatement(vf.createURI("urn:apple"), vf.createURI("urn:price"), vf.createLiteral(2.50)),
            vf.createStatement(vf.createURI("urn:gum"), vf.createURI("urn:price"), vf.createLiteral(0.99)),
            vf.createStatement(vf.createURI("urn:sandwich"), vf.createURI("urn:price"), vf.createLiteral(4.99)));

    // Create the PCJ in Fluo and load the statements into Rya.
    final String pcjId = loadDataAndCreateQuery(sparql, statements);

    // Create the expected results of the SPARQL query once the PCJ has been computed.
    final MapBindingSet expectedResult = new MapBindingSet();
    expectedResult.addBinding("maxPrice", vf.createLiteral(4.99));

    // Ensure the last result matches the expected result.
    final VisibilityBindingSet result = readLastResult(pcjId);
    assertEquals(expectedResult, result);
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Test
public void sum() throws Exception {
    // A query that sums the counts of all of the items that are in the inventory.
    final String sparql =
            "SELECT (sum(?count) as ?itemSum) { " +
                "?item <urn:count> ?count . " +
            "}";

    // Create the Statements that will be loaded into Rya.
    final ValueFactory vf = new ValueFactoryImpl();
    final Collection<Statement> statements = Sets.newHashSet(
            vf.createStatement(vf.createURI("urn:apple"), vf.createURI("urn:count"), vf.createLiteral(5)),
            vf.createStatement(vf.createURI("urn:gum"), vf.createURI("urn:count"), vf.createLiteral(7)),
            vf.createStatement(vf.createURI("urn:sandwich"), vf.createURI("urn:count"), vf.createLiteral(2)));

    // Create the PCJ in Fluo and load the statements into Rya.
    final String pcjId = loadDataAndCreateQuery(sparql, statements);

    // Create the expected results of the SPARQL query once the PCJ has been computed.
    final MapBindingSet expectedResult = new MapBindingSet();
    expectedResult.addBinding("itemSum", vf.createLiteral("14", XMLSchema.INTEGER));

    // Ensure the last result matches the expected result.
    final VisibilityBindingSet result = readLastResult(pcjId);
    assertEquals(expectedResult, result);
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Test
public void average() throws Exception  {
    // A query that finds the average price for an item that is in the inventory.
    final String sparql =
            "SELECT (avg(?price) as ?averagePrice) { " +
                "?item <urn:price> ?price . " +
            "}";

    // Create the Statements that will be loaded into Rya.
    final ValueFactory vf = new ValueFactoryImpl();
    final Collection<Statement> statements = Sets.newHashSet(
            vf.createStatement(vf.createURI("urn:apple"), vf.createURI("urn:price"), vf.createLiteral(3)),
            vf.createStatement(vf.createURI("urn:gum"), vf.createURI("urn:price"), vf.createLiteral(4)),
            vf.createStatement(vf.createURI("urn:sandwich"), vf.createURI("urn:price"), vf.createLiteral(8)));

    // Create the PCJ in Fluo and load the statements into Rya.
    final String pcjId = loadDataAndCreateQuery(sparql, statements);

    // Create the expected results of the SPARQL query once the PCJ has been computed.
    final MapBindingSet expectedResult = new MapBindingSet();
    expectedResult.addBinding("averagePrice", vf.createLiteral("5", XMLSchema.DECIMAL));

    // Ensure the last result matches the expected result.
    final VisibilityBindingSet result = readLastResult(pcjId);
    assertEquals(expectedResult, result);
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
@Test
public void subjectWrongType() {
    // Create the input binding set.
    final ValueFactory vf = new ValueFactoryImpl();
    final MapBindingSet bindingSet = new MapBindingSet();
    bindingSet.addBinding("subject", vf.createLiteral("Alice"));
    bindingSet.addBinding("predicate", vf.createURI("urn:age"));
    bindingSet.addBinding("object", vf.createLiteral(34));
    final VisibilityBindingSet visBs = new VisibilityBindingSet(bindingSet, "a");

    // Mock the processor context that will be invoked.
    final ProcessorContext context = mock(ProcessorContext.class);

    // Run the test.
    final StatementOutputFormatter formatter = new StatementOutputFormatter();
    formatter.init(context);
    formatter.process("key", ProcessorResult.make(new UnaryResult(visBs)));

    // Verify the mock was never invoked.
    verify(context, times(0)).forward(any(), any());
}
 

import org.openrdf.query.impl.MapBindingSet; //导入依赖的package包/类
private Set<VisibilityBindingSet> readGroupedResults(final String pcjId, final VariableOrder groupByVars) {
    requireNonNull(pcjId);

    // Read the results from the Kafka topic. The last one for each set of Group By values is an aggregation result.
    // The key in this map is a Binding Set containing only the group by variables.
    final Map<BindingSet, VisibilityBindingSet> results = new HashMap<>();

    try(final KafkaConsumer<String, VisibilityBindingSet> consumer = makeConsumer(pcjId)) {
        final ConsumerRecords<String, VisibilityBindingSet> records = consumer.poll(5000);
        final Iterator<ConsumerRecord<String, VisibilityBindingSet>> recordIterator = records.iterator();
        while (recordIterator.hasNext()) {
            final VisibilityBindingSet visBindingSet = recordIterator.next().value();

            final MapBindingSet key = new MapBindingSet();
            for(final String groupByBar : groupByVars) {
                key.addBinding( visBindingSet.getBinding(groupByBar) );
            }

            results.put(key, visBindingSet);
        }
    }

    return Sets.newHashSet( results.values() );
}