Examples of org.kiji.schema.EntityId

org.kiji.schema.EntityId
EntityId is used to identify a particular row under the key format of a Kiji table. There are two name-spaces for rows:
- Kiji rows are logically indexed by Kiji row keys (arbitrary byte arrays or a list of key components).
- Under the hood, rows are indexed by HBase row keys (arbitrary byte arrays).
The translation between Kiji row keys and HBase row keys depends on the layout of the table the row belongs to. The same Kiji row key may translate to two different EntityIds on two different tables, based on their key format. For a representation of row keys which is agnostic to row key formats, see {@link KijiRowKeyComponents}. There are multiple translation schemes:
- Raw: Kiji row keys and HBase row keys are identical (identity translation), specifically used when the row key is an array of bytes.
- Hash: HBase row keys are MD5 hashes of the Kiji row key (non reversible transform).
- Hash-prefix: HBase row keys are Kiji row keys prefixed by a hash of the Kiji row key.
- Formatted: The user specifies the composition of the key. The key can be composed of one or more components of type string, number or a hash of one of the other components.


  @Test
  public void testHBaseEIDtoHashPrefixedEID() throws Exception {
    final EntityIdFactory factory =
      EntityIdFactory.getFactory((RowKeyFormat) mHashPrefixedLayout.getDesc().getKeysFormat());
    final EntityId hpeid = factory.getEntityId("hashPrefixedEID");
    final EntityId hbeid = HBaseEntityId.fromHBaseRowKey(hpeid.getHBaseRowKey());


    assertEquals(hpeid,
        ToolUtils.createEntityIdFromUserInputs(hbeid.toShellString(), mHashPrefixedLayout));
  }

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  @Test
  public void testHBaseEIDtoFormattedEID() throws Exception {
    final EntityIdFactory factory =
        EntityIdFactory.getFactory((RowKeyFormat2) mFormattedLayout.getDesc().getKeysFormat());
    final EntityId feid = factory.getEntityId("dummy", "str1", "str2", 5, 10);
    final EntityId hbeid = HBaseEntityId.fromHBaseRowKey(feid.getHBaseRowKey());


    assertEquals(feid,
        ToolUtils.createEntityIdFromUserInputs(hbeid.toShellString(), mFormattedLayout));
  }

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    final TableLayoutDesc desc =
        KijiTableLayouts.getLayout(KijiTableLayouts.COUNTER_TEST);
    final KijiTableLayout layout = KijiTableLayout.newLayout(desc);
    final EntityIdFactory factory = EntityIdFactory.getFactory(layout);
    final byte[] rowKey = Bytes.toBytes(UNUSUAL_STRING_EID);
    final EntityId originalEid = factory.getEntityIdFromHBaseRowKey(rowKey);
    final JsonEntityIdParser restEid1 = JsonEntityIdParser.create(originalEid, layout);
    final JsonEntityIdParser restEid2 = JsonEntityIdParser.create(
        String.format("hbase=%s", Bytes.toStringBinary(rowKey)), layout);
    final JsonEntityIdParser restEid3 = JsonEntityIdParser.create(
        String.format("hbase_hex=%s", new String(Hex.encodeHex((rowKey)))), layout);

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    final KijiTableLayout layout = KijiTableLayout.newLayout(desc);
    final EntityIdFactory factory = EntityIdFactory.getFactory(layout);


    // Byte array representations of row keys should work.
    final byte[] rowKey = Bytes.toBytes(UNUSUAL_STRING_EID);
    final EntityId originalEid = factory.getEntityIdFromHBaseRowKey(rowKey);
    final JsonEntityIdParser restEid1 = JsonEntityIdParser.create(originalEid, layout);
    final JsonEntityIdParser restEid2 = JsonEntityIdParser.create(
        String.format("hbase=%s", Bytes.toStringBinary(rowKey)), layout);
    final JsonEntityIdParser restEid3 = JsonEntityIdParser.create(
        String.format("hbase_hex=%s", new String(Hex.encodeHex((rowKey)))), layout);


    // Resolved entity id should match origin entity id.
    assertEquals(originalEid, restEid1.getEntityId());
    assertEquals(originalEid, restEid2.getEntityId());
    assertEquals(originalEid, restEid3.getEntityId());


    // Component representation of entities should work.
    final JsonEntityIdParser restEid4 = JsonEntityIdParser.create(SINGLE_COMPONENT_EID, layout);
    final EntityId resolvedEid = restEid4.getEntityId();
    final String recoveredComponent = Bytes.toString(
        Bytes.toBytesBinary(
            resolvedEid.toShellString().substring(
                ToolUtils.KIJI_ROW_KEY_SPEC_PREFIX.length())));
    assertEquals(UNUSUAL_STRING_EID, recoveredComponent);
    assertEquals(resolvedEid, restEid4.getEntityId());
  }

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    final byte[] rowKey = Bytes.toBytes(UNUSUAL_STRING_EID);
    final byte[] hash = Hasher.hash(Bytes.toBytes(UNUSUAL_STRING_EID));
    final byte[] hbaseRowKey = new byte[rowKey.length + 2];
    System.arraycopy(hash, 0, hbaseRowKey, 0, 2);
    System.arraycopy(rowKey, 0, hbaseRowKey, 2, rowKey.length);
    final EntityId originalEid = factory.getEntityIdFromHBaseRowKey(hbaseRowKey);
    final JsonEntityIdParser restEid1 = JsonEntityIdParser.create(originalEid, layout);
    final JsonEntityIdParser restEid2 = JsonEntityIdParser.create(
        String.format("hbase=%s", Bytes.toStringBinary(hbaseRowKey)), layout);
    final JsonEntityIdParser restEid3 = JsonEntityIdParser.create(
        String.format("hbase_hex=%s", new String(Hex.encodeHex((hbaseRowKey)))), layout);


    // Resolved entity id should match origin entity id.
    assertEquals(originalEid, restEid1.getEntityId());
    assertEquals(originalEid, restEid2.getEntityId());
    assertEquals(originalEid, restEid3.getEntityId());


    // Component representation of entities should work.
    final JsonEntityIdParser restEid4 = JsonEntityIdParser.create(SINGLE_COMPONENT_EID, layout);
    final EntityId resolvedEid = restEid4.getEntityId();
    final String recoveredComponent = Bytes.toString(
        Bytes.toBytesBinary(
            resolvedEid.toShellString().substring(
                ToolUtils.KIJI_ROW_KEY_SPEC_PREFIX.length())));
    assertEquals(UNUSUAL_STRING_EID, recoveredComponent);
    assertEquals(resolvedEid, restEid4.getEntityId());
  }

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    final TableLayoutDesc desc =
        KijiTableLayouts.getLayout(KijiTableLayouts.PAGING_TEST);
    final KijiTableLayout layout = KijiTableLayout.newLayout(desc);
    final EntityIdFactory factory = EntityIdFactory.getFactory(layout);
    final byte[] rowKey = Bytes.toBytes(UNUSUAL_STRING_EID);
    final EntityId originalEid = factory.getEntityIdFromHBaseRowKey(rowKey);
    final JsonEntityIdParser restEid1 = JsonEntityIdParser.create(originalEid, layout);
    final JsonEntityIdParser restEid2 = JsonEntityIdParser.create(
        String.format("hbase=%s", Bytes.toStringBinary(rowKey)), layout);
    final JsonEntityIdParser restEid3 = JsonEntityIdParser.create(
        String.format("hbase_hex=%s", new String(Hex.encodeHex((rowKey)))), layout);

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        JSONObject.quote(UNUSUAL_STRING_EID),
        JSONObject.quote(UNUSUAL_STRING_EID),
        JSONObject.quote(UNUSUAL_STRING_EID),
        Integer.MIN_VALUE,
        Long.MAX_VALUE);
    final EntityId originalEid = ToolUtils.createEntityIdFromUserInputs(eidString, layout);
    final JsonEntityIdParser restEid1 = JsonEntityIdParser.create(originalEid, layout);
    final JsonEntityIdParser restEid2 = JsonEntityIdParser.create(eidString, layout);
    final JsonEntityIdParser restEid3 = JsonEntityIdParser.create(
        String.format("hbase_hex=%s",
            new String(Hex.encodeHex((originalEid.getHBaseRowKey())))), layout);
    final JsonEntityIdParser restEid4 = JsonEntityIdParser.create(
        String.format("hbase=%s", Bytes.toStringBinary(originalEid.getHBaseRowKey()))
        , layout);


    // Resolved entity id should match origin entity id.
    assertEquals(originalEid, restEid1.getEntityId());
    assertEquals(originalEid, restEid2.getEntityId());

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        JSONObject.quote(UNUSUAL_STRING_EID),
        JSONObject.quote(UNUSUAL_STRING_EID),
        JSONObject.quote(UNUSUAL_STRING_EID),
        Integer.MIN_VALUE,
        Long.MAX_VALUE);
    final EntityId originalEid = ToolUtils.createEntityIdFromUserInputs(eidString, layout);
    final JsonEntityIdParser restEid1 = JsonEntityIdParser.create(originalEid, layout);
    final JsonEntityIdParser restEid2 = JsonEntityIdParser.create(eidString, layout);
    final JsonEntityIdParser restEid3 = JsonEntityIdParser.create(
        String.format("hbase_hex=%s",
            new String(Hex.encodeHex((originalEid.getHBaseRowKey())))), layout);
    final JsonEntityIdParser restEid4 = JsonEntityIdParser.create(
        String.format("hbase=%s", Bytes.toStringBinary(originalEid.getHBaseRowKey())), layout);
    final EntityId toolUtilsEid = ToolUtils.createEntityIdFromUserInputs(eidString, layout);


    // Resolved entity id should match origin entity id.
    assertEquals(originalEid, restEid1.getEntityId());
    assertEquals(originalEid, restEid2.getEntityId());
    assertEquals(originalEid, restEid3.getEntityId());

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    final KijiTable table = kiji.openTable(layout.getName());
    try {
      assertEquals(BaseTool.SUCCESS, runTool(new GetTool(), table.getURI().toString(),
          "--entity-id=[\"jane.doe@gmail.com\"]"));
      assertEquals(5, mToolOutputLines.length);
      EntityId eid = EntityIdFactory.getFactory(layout).getEntityId("gwu@usermail.example.com");
      String hbaseRowKey = Hex.encodeHexString(eid.getHBaseRowKey());
      assertEquals(BaseTool.SUCCESS, runTool(new GetTool(),
          table.getURI() + "info:name",
              "--entity-id=hbase=hex:" + hbaseRowKey
          ));
      assertEquals(3, mToolOutputLines.length);

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      // Prefetch the next row for hasNext():
      mNextResult = getNextResult();


      // Decode the HBase result into a KijiRowData:
      try {
        final EntityId entityId = mEntityIdFactory.getEntityIdFromHBaseRowKey(result.getRow());
        return new HBaseKijiRowData(mTable, mDataRequest, entityId, result, mCellDecoderProvider);
      } catch (IOException ioe) {
        throw new KijiIOException(ioe);
      }
    }

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