Examples of com.sleepycat.bdb.bind.KeyExtractor.clearIndexKey()

com.sleepycat.bdb.bind.KeyExtractor.clearIndexKey()

Clears the index key in a value buffer. The index key is cleared when the index is for a foreign key identifying a record that has been deleted. This method is called only if the {@link com.sleepycat.bdb.ForeignKeyIndex} is configured with {@link com.sleepycat.bdb.ForeignKeyIndex#ON_DELETE_CLEAR}. It is never called for index keys that are derived from primary key data, since in this case {@link com.sleepycat.bdb.ForeignKeyIndex#ON_DELETE_CLEAR} is notallowed. @param valueData is the source and destination value data. On entrythis contains the index key to be cleared. It should be changed by this method such that {@link #extractIndexKey} will extract a null key (setthe buffer length to zero). Other data in the buffer should remain unchanged.

        binding.objectToKey(val, keyBuffer);


        extractor.extractIndexKey(keyBuffer, buffer, indexKeyBuffer);
        assertEquals("indexKey", indexKeyFormat.dataToObject(indexKeyBuffer));


        extractor.clearIndexKey(buffer);
        extractor.extractIndexKey(keyBuffer, buffer, indexKeyBuffer);
        assertEquals(0, indexKeyBuffer.getDataLength());
    }


    // also tests TupleSerialBinding since TupleSerialMarshalledBinding extends


        extractor.extractIndexKey(keyBuffer, buffer, indexKeyBuffer);
        TupleInput in = indexKeyFormat.dataToInput(indexKeyBuffer);
        assertEquals("index1", in.readString());


        extractor.clearIndexKey(buffer);
        extractor.extractIndexKey(keyBuffer, buffer, indexKeyBuffer);
        assertEquals(0, indexKeyBuffer.getDataLength());
    }


    private static class MySerialSerialBinding extends SerialSerialBinding {


        extractor.extractIndexKey(keyBuffer, buffer, indexKeyBuffer);
        TupleInput in = indexKeyFormat.dataToInput(indexKeyBuffer);
        assertEquals("index1", in.readString());


        extractor.clearIndexKey(buffer);
        extractor.extractIndexKey(keyBuffer, buffer, indexKeyBuffer);
        assertEquals(0, indexKeyBuffer.getDataLength());
    }
}

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