Examples of com.persistit.Key.clear()

com.persistit.Key.clear()
Sets the current location and size of this Key to zero, effectively removing any previously appended key segments. @return This Key, to permit method call chaining

        PersistitKeyValueSource source = new PersistitKeyValueSource(MString.VARCHAR.instance(true));
        long hash_AB;
        long hash_ab;
        Key key = store().createKey();
        {
            binaryCollator.append(key.clear(), "AB");
            source.attach(key, 0, MString.VARCHAR.instance(true));
            hash_AB = ValueSources.hash(source, binaryCollator);
            binaryCollator.append(key.clear(), "ab");
            source.attach(key, 0, MString.VARCHAR.instance(true));
            hash_ab = ValueSources.hash(source, binaryCollator);

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        Key key = store().createKey();
        {
            binaryCollator.append(key.clear(), "AB");
            source.attach(key, 0, MString.VARCHAR.instance(true));
            hash_AB = ValueSources.hash(source, binaryCollator);
            binaryCollator.append(key.clear(), "ab");
            source.attach(key, 0, MString.VARCHAR.instance(true));
            hash_ab = ValueSources.hash(source, binaryCollator);
            assertTrue(hash_AB != hash_ab);
        }
        {

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            source.attach(key, 0, MString.VARCHAR.instance(true));
            hash_ab = ValueSources.hash(source, binaryCollator);
            assertTrue(hash_AB != hash_ab);
        }
        {
            caseInsensitiveCollator.append(key.clear(), "AB");
            source.attach(key, 0, MString.VARCHAR.instance(true));
            hash_AB = ValueSources.hash(source, caseInsensitiveCollator);
            caseInsensitiveCollator.append(key.clear(), "ab");
            source.attach(key, 0, MString.VARCHAR.instance(true));
            hash_ab = ValueSources.hash(source, caseInsensitiveCollator);

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        }
        {
            caseInsensitiveCollator.append(key.clear(), "AB");
            source.attach(key, 0, MString.VARCHAR.instance(true));
            hash_AB = ValueSources.hash(source, caseInsensitiveCollator);
            caseInsensitiveCollator.append(key.clear(), "ab");
            source.attach(key, 0, MString.VARCHAR.instance(true));
            hash_ab = ValueSources.hash(source, caseInsensitiveCollator);
            assertTrue(hash_AB == hash_ab);
        }
    }

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            indexToHKey = ((TableIndex)index).indexToHKey();
        }
        
        
        Key hKey = keyCreator.createKey();
        hKey.clear();
        for (int i = 0; i < indexToHKey.getLength(); i++) {
            if (indexToHKey.isOrdinal(i)) {
                hKey.append(indexToHKey.getOrdinal(i));
            } else {
                int indexField = indexToHKey.getIndexRowPosition(i);

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     private void testObjectToKey(FieldDef field, Object... testValues) throws PersistitException {
        Key key = store().createKey();
        PersistitKeyAppender appender = PersistitKeyAppender.create(key, null);
        for(Object inObj : testValues) {
            key.clear();
            appender.append(inObj, field);


            Object outObj = key.decode();
            if(outObj != null) {
                assertEquals(inObj.toString(), outObj.toString());

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        extractKeySegments(key, keyList);
        // Value traversal. If the value is defined, then it contains more fields encoded like a key.
        // TODO: What about group indexes?
        if (!groupIndex() && value.isDefined()) {
            Key buffer = new Key(key);
            buffer.clear();
            value.getByteArray(buffer.getEncodedBytes(), 0, 0, value.getArrayLength());
            buffer.setEncodedSize(value.getArrayLength());
            extractKeySegments(buffer, keyList);
        }
        return keyList;

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    }


    public int compare(byte[] bytes)
    {
        Key thatKey = new Key(key);
        thatKey.clear();
        thatKey.append(bytes);
        thatKey.indexTo(0);
        int thatPosition = thatKey.getIndex();
        thatKey.indexTo(1);
        int thatEnd = thatKey.getIndex();

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            /*
             * Row being inserted might be the parent of orphan rows already present.
             * The hKeys of these orphan rows need to be maintained. The ones of interest
             * contain the PK from the inserted row, and nulls for other hKey fields nearer the root.
             */
            hKey.clear();
            Table table = rowDef.table();
            PersistitKeyAppender hKeyAppender = PersistitKeyAppender.create(hKey, table.getName());
            List<Column> pkColumns = table.getPrimaryKeyIncludingInternal().getColumns();
            for(HKeySegment segment : table.hKey().segments()) {
                RowDef segmentRowDef = segment.table().rowDef();

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