Examples of org.lilyproject.repository.api.ReturnFields

org.lilyproject.repository.api.ReturnFields
Specifies what fields to return in a Record object.
This can be a manual enumeration of fields, or it can be ALL or NONE. Note that ALL is usually the same as not specifying a ReturnFields object.
For ALL and NONE, you can avoid instantiation by using {@link #ALL} and {@link #NONE}

Instances of this class are immutable.

                    RecordFilterJsonConverters.INSTANCE));
        }


        ObjectNode returnFieldsNode = JsonUtil.getObject(node, "returnFields", null);
        if (returnFieldsNode != null) {
            ReturnFields returnFields = new ReturnFields();
            returnFields.setType(ReturnFields.Type.valueOf(JsonUtil.getString(returnFieldsNode, "type")));


            ArrayNode fieldsArray = JsonUtil.getArray(returnFieldsNode, "fields", null);
            if (fieldsArray != null) {
                List<QName> fields = new ArrayList<QName>();
                for (JsonNode subFilterNode : fieldsArray) {
                    if (!subFilterNode.isTextual()) {
                        throw new JsonFormatException("ReturnFields.fields should be a string array, found: "
                                + subFilterNode.getClass().getName());
                    }
                    fields.add(QNameConverter.fromJson(subFilterNode.getTextValue(), namespaces));
                }
                returnFields.setFields(fields);
            }


            scan.setReturnFields(returnFields);
        }

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        // Test ALL filter
        RecordScan scan = new RecordScan();
        scan.setRecordFilter(new RecordTypeFilter(rt.getName()));
        scan.setReturnFields(new ReturnFields(ReturnFields.Type.ALL));
        Record record = repository.getScanner(scan).next();
        assertEquals(3, record.getFields().size());


        // Test NONE filter
        scan = new RecordScan();
        scan.setRecordFilter(new RecordTypeFilter(rt.getName()));
        scan.setReturnFields(new ReturnFields(ReturnFields.Type.NONE));
        record = repository.getScanner(scan).next();
        assertEquals(0, record.getFields().size());


        // Test ENUM filter
        scan = new RecordScan();
        scan.setRecordFilter(new RecordTypeFilter(rt.getName()));
        scan.setReturnFields(new ReturnFields(f1.getName(), f2.getName()));
        record = repository.getScanner(scan).next();
        assertEquals(2, record.getFields().size());
        assertTrue(record.hasField(f1.getName()));
        assertTrue(record.hasField(f2.getName()));
        assertFalse(record.hasField(f3.getName()));


        // Test scanning on filtered field, should not work
        scan = new RecordScan();
        RecordFilterList filterList = new RecordFilterList();
        filterList.addFilter(new RecordTypeFilter(rt.getName()));
        filterList.addFilter(new FieldValueFilter(f1.getName(), "A"));
        scan.setRecordFilter(filterList);
        // without ReturnFields, we get a result
        assertNotNull(repository.getScanner(scan).next());
        // with ReturnFields that doesn't include f1, we don't get a result
        scan.setReturnFields(new ReturnFields(f2.getName()));
        // TODO disabled this test as it was sometimes failing, and sometimes not
        //      In the cases where it failed, it did bring up the row which is
        //      correct according to the filters, but which we didn't expect to
        //      receive because a filter was applied on a non-read column.
        //      The conclusion could be that while HBase can't guarantee the filter

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        // Test ALL filter
        RecordScan scan = new RecordScan();
        scan.setRecordFilter(new RecordTypeFilter(rt.getName()));
        scan.setReturnFields(new ReturnFields(ReturnFields.Type.ALL));
        Record record = repository.getScanner(scan).next();
        assertNotNull(record.getRecordTypeName());
        assertEquals(ns, record.getRecordTypeName().getNamespace());


        // Test NONE filter
        scan = new RecordScan();
        scan.setRecordFilter(new RecordTypeFilter(rt.getName()));
        scan.setReturnFields(new ReturnFields(ReturnFields.Type.NONE));
        record = repository.getScanner(scan).next();
        assertNotNull(record.getRecordTypeName());
        assertEquals(ns, record.getRecordTypeName().getNamespace());


        // Test ENUM filter
        scan = new RecordScan();
        scan.setRecordFilter(new RecordTypeFilter(rt.getName()));
        scan.setReturnFields(new ReturnFields(f1.getName(), f2.getName()));
        record = repository.getScanner(scan).next();
        assertNotNull(record.getRecordTypeName());
        assertEquals(ns, record.getRecordTypeName().getNamespace());
    }

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        hbaseScan.setCaching(scan.getCaching());


        hbaseScan.setCacheBlocks(scan.getCacheBlocks());


        ReturnFields returnFields = scan.getReturnFields();
        if (returnFields != null && returnFields.getType() != ReturnFields.Type.ALL) {
            RecordDecoder.addSystemColumnsToScan(hbaseScan);
            switch (returnFields.getType()) {
                case ENUM:
                    for (QName field : returnFields.getFields()) {
                        FieldTypeImpl fieldType = (FieldTypeImpl) typeManager.getFieldTypeByName(field);
                        hbaseScan.addColumn(RecordCf.DATA.bytes, fieldType.getQualifier());
                    }
                    break;
                case NONE:
                    // nothing to add
                    break;
                default:
                    throw new RuntimeException("Unrecognized ReturnFields type: " + returnFields.getType());
            }
        } else {
            hbaseScan.addFamily(RecordCf.DATA.bytes);
        }

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        RecordScan parsedScan = scanFromBytes(data);


        assertEquals(ReturnFields.NONE.getType(), parsedScan.getReturnFields().getType());


        // Test with enumeration of fields to return
        scan.setReturnFields(new ReturnFields(new QName("ns", "f1"), new QName("ns", "f2")));
        data = scanToBytes(scan);
        parsedScan = scanFromBytes(data);


        assertEquals(ReturnFields.Type.ENUM, parsedScan.getReturnFields().getType());
        assertEquals(Lists.newArrayList(new QName("ns", "f1"), new QName("ns", "f2")),

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Related Classes of org.lilyproject.repository.api.ReturnFields

org.lilyproject.repository.impl.BaseRepository

org.lilyproject.repository.impl.test.AbstractRepositoryTest

org.lilyproject.tools.import_.json.RecordScanReader

org.lilyproject.tools.import_.json.test.JsonConversionTest

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