Package org.apache.hadoop.hbase.security.visibility.expression

Examples of org.apache.hadoop.hbase.security.visibility.expression.NonLeafExpressionNode

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    } else {
      ExpressionNode top = expStack.peek();
      if (top == LeafExpressionNode.OPEN_PARAN_NODE) {
        expStack.push(node);
      } else if (top instanceof NonLeafExpressionNode) {
        NonLeafExpressionNode nlTop = (NonLeafExpressionNode) expStack.pop();
        nlTop.addChildExp(node);
        if (nlTop.getOperator() == Operator.NOT && !expStack.isEmpty()) {
          ExpressionNode secondTop = expStack.peek();
          if (secondTop == LeafExpressionNode.OPEN_PARAN_NODE) {
            expStack.push(nlTop);
          } else if (secondTop instanceof NonLeafExpressionNode) {
            ((NonLeafExpressionNode) secondTop).addChildExp(nlTop);
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    ExpressionNode top = expStack.pop();
    if (top.isSingleNode()) {
      if (top == LeafExpressionNode.OPEN_PARAN_NODE) {
        throw new ParseException("Error parsing expression " + expS + " at column : " + index);
      }
      expStack.push(new NonLeafExpressionNode(op, top));
    } else {
      NonLeafExpressionNode nlTop = (NonLeafExpressionNode) top;
      if (nlTop.getChildExps().size() != 2) {
        throw new ParseException("Error parsing expression " + expS + " at column : " + index);
      }
      expStack.push(new NonLeafExpressionNode(op, nlTop));
    }
  }
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      }
      if (!top.isSingleNode() && ((NonLeafExpressionNode) top).getChildExps().size() != 1) {
        throw new ParseException("Error parsing expression " + expS + " at column : " + index);
      }
    }
    expStack.push(new NonLeafExpressionNode(Operator.NOT));
  }
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      getLabelOrdinals(node, labelOrdinals);
      writeLabelOrdinalsToStream(labelOrdinals, dos);
      tags.add(new Tag(VisibilityUtils.VISIBILITY_TAG_TYPE, baos.toByteArray()));
      baos.reset();
    } else {
      NonLeafExpressionNode nlNode = (NonLeafExpressionNode) node;
      if (nlNode.getOperator() == Operator.OR) {
        for (ExpressionNode child : nlNode.getChildExps()) {
          getLabelOrdinals(child, labelOrdinals);
          writeLabelOrdinalsToStream(labelOrdinals, dos);
          tags.add(new Tag(VisibilityUtils.VISIBILITY_TAG_TYPE, baos.toByteArray()));
          baos.reset();
          labelOrdinals.clear();
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      getLabelOrdinals(node, labelOrdinals);
      writeLabelOrdinalsToStream(labelOrdinals, dos);
      tags.add(new Tag(VisibilityUtils.VISIBILITY_TAG_TYPE, baos.toByteArray()));
      baos.reset();
    } else {
      NonLeafExpressionNode nlNode = (NonLeafExpressionNode) node;
      if (nlNode.getOperator() == Operator.OR) {
        for (ExpressionNode child : nlNode.getChildExps()) {
          getLabelOrdinals(child, labelOrdinals);
          writeLabelOrdinalsToStream(labelOrdinals, dos);
          tags.add(new Tag(VisibilityUtils.VISIBILITY_TAG_TYPE, baos.toByteArray()));
          baos.reset();
          labelOrdinals.clear();
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  @Test
  public void testPositiveCases() throws Exception {
    ExpressionExpander expander = new ExpressionExpander();

    // (!a) -> (!a)
    NonLeafExpressionNode exp1 = new NonLeafExpressionNode(Operator.NOT,
        new LeafExpressionNode("a"));
    ExpressionNode result = expander.expand(exp1);
    assertTrue(result instanceof NonLeafExpressionNode);
    NonLeafExpressionNode nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.NOT, nlResult.getOperator());
    assertEquals("a", ((LeafExpressionNode) nlResult.getChildExps().get(0)).getIdentifier());

    // (a | b) -> (a | b)
    NonLeafExpressionNode exp2 = new NonLeafExpressionNode(Operator.OR,
        new LeafExpressionNode("a"), new LeafExpressionNode("b"));
    result = expander.expand(exp2);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.OR, nlResult.getOperator());
    assertEquals(2, nlResult.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) nlResult.getChildExps().get(0)).getIdentifier());
    assertEquals("b", ((LeafExpressionNode) nlResult.getChildExps().get(1)).getIdentifier());

    // (a & b) -> (a & b)
    NonLeafExpressionNode exp3 = new NonLeafExpressionNode(Operator.AND,
        new LeafExpressionNode("a"), new LeafExpressionNode("b"));
    result = expander.expand(exp3);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.AND, nlResult.getOperator());
    assertEquals(2, nlResult.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) nlResult.getChildExps().get(0)).getIdentifier());
    assertEquals("b", ((LeafExpressionNode) nlResult.getChildExps().get(1)).getIdentifier());

    // ((a | b) | c) -> (a | b | c)
    NonLeafExpressionNode exp4 = new NonLeafExpressionNode(Operator.OR, new NonLeafExpressionNode(
        Operator.OR, new LeafExpressionNode("a"), new LeafExpressionNode("b")),
        new LeafExpressionNode("c"));
    result = expander.expand(exp4);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.OR, nlResult.getOperator());
    assertEquals(3, nlResult.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) nlResult.getChildExps().get(0)).getIdentifier());
    assertEquals("b", ((LeafExpressionNode) nlResult.getChildExps().get(1)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) nlResult.getChildExps().get(2)).getIdentifier());

    // ((a & b) & c) -> (a & b & c)
    NonLeafExpressionNode exp5 = new NonLeafExpressionNode(Operator.AND, new NonLeafExpressionNode(
        Operator.AND, new LeafExpressionNode("a"), new LeafExpressionNode("b")),
        new LeafExpressionNode("c"));
    result = expander.expand(exp5);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.AND, nlResult.getOperator());
    assertEquals(3, nlResult.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) nlResult.getChildExps().get(0)).getIdentifier());
    assertEquals("b", ((LeafExpressionNode) nlResult.getChildExps().get(1)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) nlResult.getChildExps().get(2)).getIdentifier());

    // (a | b) & c -> ((a & c) | (b & c))
    NonLeafExpressionNode exp6 = new NonLeafExpressionNode(Operator.AND, new NonLeafExpressionNode(
        Operator.OR, new LeafExpressionNode("a"), new LeafExpressionNode("b")),
        new LeafExpressionNode("c"));
    result = expander.expand(exp6);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.OR, nlResult.getOperator());
    assertEquals(2, nlResult.getChildExps().size());
    NonLeafExpressionNode temp = (NonLeafExpressionNode) nlResult.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(1);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("b", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    // (a & b) | c -> ((a & b) | c)
    NonLeafExpressionNode exp7 = new NonLeafExpressionNode(Operator.OR, new NonLeafExpressionNode(
        Operator.AND, new LeafExpressionNode("a"), new LeafExpressionNode("b")),
        new LeafExpressionNode("c"));
    result = expander.expand(exp7);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.OR, nlResult.getOperator());
    assertEquals(2, nlResult.getChildExps().size());
    assertEquals("c", ((LeafExpressionNode) nlResult.getChildExps().get(1)).getIdentifier());
    nlResult = (NonLeafExpressionNode) nlResult.getChildExps().get(0);
    assertEquals(Operator.AND, nlResult.getOperator());
    assertEquals(2, nlResult.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) nlResult.getChildExps().get(0)).getIdentifier());
    assertEquals("b", ((LeafExpressionNode) nlResult.getChildExps().get(1)).getIdentifier());

    // ((a & b) | c) & d -> (((a & b) & d) | (c & d))
    NonLeafExpressionNode exp8 = new NonLeafExpressionNode(Operator.AND);
    exp8.addChildExp(new NonLeafExpressionNode(Operator.OR, new NonLeafExpressionNode(Operator.AND,
        new LeafExpressionNode("a"), new LeafExpressionNode("b")), new LeafExpressionNode("c")));
    exp8.addChildExp(new LeafExpressionNode("d"));
    result = expander.expand(exp8);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.OR, nlResult.getOperator());
    assertEquals(2, nlResult.getChildExps().size());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(1);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("c", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) temp.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("b", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    // (a | b) | (c | d) -> (a | b | c | d)
    NonLeafExpressionNode exp9 = new NonLeafExpressionNode(Operator.OR);
    exp9.addChildExp(new NonLeafExpressionNode(Operator.OR, new LeafExpressionNode("a"),
        new LeafExpressionNode("b")));
    exp9.addChildExp(new NonLeafExpressionNode(Operator.OR, new LeafExpressionNode("c"),
        new LeafExpressionNode("d")));
    result = expander.expand(exp9);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.OR, nlResult.getOperator());
    assertEquals(4, nlResult.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) nlResult.getChildExps().get(0)).getIdentifier());
    assertEquals("b", ((LeafExpressionNode) nlResult.getChildExps().get(1)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) nlResult.getChildExps().get(2)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) nlResult.getChildExps().get(3)).getIdentifier());

    // (a & b) & (c & d) -> (a & b & c & d)
    NonLeafExpressionNode exp10 = new NonLeafExpressionNode(Operator.AND);
    exp10.addChildExp(new NonLeafExpressionNode(Operator.AND, new LeafExpressionNode("a"),
        new LeafExpressionNode("b")));
    exp10.addChildExp(new NonLeafExpressionNode(Operator.AND, new LeafExpressionNode("c"),
        new LeafExpressionNode("d")));
    result = expander.expand(exp10);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.AND, nlResult.getOperator());
    assertEquals(4, nlResult.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) nlResult.getChildExps().get(0)).getIdentifier());
    assertEquals("b", ((LeafExpressionNode) nlResult.getChildExps().get(1)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) nlResult.getChildExps().get(2)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) nlResult.getChildExps().get(3)).getIdentifier());

    // (a | b) & (c | d) -> ((a & c) | (a & d) | (b & c) | (b & d))
    NonLeafExpressionNode exp11 = new NonLeafExpressionNode(Operator.AND);
    exp11.addChildExp(new NonLeafExpressionNode(Operator.OR, new LeafExpressionNode("a"),
        new LeafExpressionNode("b")));
    exp11.addChildExp(new NonLeafExpressionNode(Operator.OR, new LeafExpressionNode("c"),
        new LeafExpressionNode("d")));
    result = expander.expand(exp11);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.OR, nlResult.getOperator());
    assertEquals(4, nlResult.getChildExps().size());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(1);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(2);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("b", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(3);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("b", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    // (((a | b) | c) | d) & e -> ((a & e) | (b & e) | (c & e) | (d & e))
    NonLeafExpressionNode exp12 = new NonLeafExpressionNode(Operator.AND);
    NonLeafExpressionNode tempExp1 = new NonLeafExpressionNode(Operator.OR, new LeafExpressionNode(
        "a"), new LeafExpressionNode("b"));
    NonLeafExpressionNode tempExp2 = new NonLeafExpressionNode(Operator.OR, tempExp1,
        new LeafExpressionNode("c"));
    NonLeafExpressionNode tempExp3 = new NonLeafExpressionNode(Operator.OR, tempExp2,
        new LeafExpressionNode("d"));
    exp12.addChildExp(tempExp3);
    exp12.addChildExp(new LeafExpressionNode("e"));
    result = expander.expand(exp12);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.OR, nlResult.getOperator());
    assertEquals(4, nlResult.getChildExps().size());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("e", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(1);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("b", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("e", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(2);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("c", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("e", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(3);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("e", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    // (a | b | c) & d -> ((a & d) | (b & d) | (c & d))
    NonLeafExpressionNode exp13 = new NonLeafExpressionNode(Operator.AND,
        new NonLeafExpressionNode(Operator.OR, new LeafExpressionNode("a"), new LeafExpressionNode(
            "b"), new LeafExpressionNode("c")), new LeafExpressionNode("d"));
    result = expander.expand(exp13);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.OR, nlResult.getOperator());
    assertEquals(3, nlResult.getChildExps().size());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(1);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("b", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(2);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("c", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    // ((a | b) & (c | d)) & (e | f) -> (((a & c) & e) | ((a & c) & f) | ((a & d) & e) | ((a & d) &
    // f) | ((b & c) & e) | ((b & c) & f) | ((b & d) & e) | ((b & d) & f))
    NonLeafExpressionNode exp15 = new NonLeafExpressionNode(Operator.AND);
    NonLeafExpressionNode temp1 = new NonLeafExpressionNode(Operator.AND);
    temp1.addChildExp(new NonLeafExpressionNode(Operator.OR, new LeafExpressionNode("a"),
        new LeafExpressionNode("b")));
    temp1.addChildExp(new NonLeafExpressionNode(Operator.OR, new LeafExpressionNode("c"),
        new LeafExpressionNode("d")));
    exp15.addChildExp(temp1);
    exp15.addChildExp(new NonLeafExpressionNode(Operator.OR, new LeafExpressionNode("e"),
        new LeafExpressionNode("f")));
    result = expander.expand(exp15);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.OR, nlResult.getOperator());
    assertEquals(8, nlResult.getChildExps().size());
    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("e", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) temp.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(1);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("f", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) temp.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(2);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("e", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) temp.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(3);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("f", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) temp.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("a", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(4);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("e", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) temp.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("b", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(5);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("f", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) temp.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("b", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("c", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(6);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("e", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) temp.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("b", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    temp = (NonLeafExpressionNode) nlResult.getChildExps().get(7);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("f", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());
    temp = (NonLeafExpressionNode) temp.getChildExps().get(0);
    assertEquals(Operator.AND, temp.getOperator());
    assertEquals(2, temp.getChildExps().size());
    assertEquals("b", ((LeafExpressionNode) temp.getChildExps().get(0)).getIdentifier());
    assertEquals("d", ((LeafExpressionNode) temp.getChildExps().get(1)).getIdentifier());

    // !(a | b) -> ((!a) & (!b))
    NonLeafExpressionNode exp16 = new NonLeafExpressionNode(Operator.NOT,
        new NonLeafExpressionNode(Operator.OR, new LeafExpressionNode("a"), new LeafExpressionNode(
            "b")));
    result = expander.expand(exp16);
    assertTrue(result instanceof NonLeafExpressionNode);
    nlResult = (NonLeafExpressionNode) result;
    assertEquals(Operator.AND, nlResult.getOperator());
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@InterfaceAudience.Private
public class ExpressionExpander {

  public ExpressionNode expand(ExpressionNode src) {
    if (!src.isSingleNode()) {
      NonLeafExpressionNode nlExp = (NonLeafExpressionNode) src;
      List<ExpressionNode> childExps = nlExp.getChildExps();
      Operator outerOp = nlExp.getOperator();
      if (isToBeExpanded(childExps)) {
        // Any of the child exp is a non leaf exp with & or | operator
        NonLeafExpressionNode newNode = new NonLeafExpressionNode(nlExp.getOperator());
        for (ExpressionNode exp : childExps) {
          if (exp.isSingleNode()) {
            newNode.addChildExp(exp);
          } else {
            newNode.addChildExp(expand(exp));
          }
        }
        nlExp = expandNonLeaf(newNode, outerOp);
      }
      return nlExp;
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  private ExpressionNode negate(NonLeafExpressionNode nlExp) {
    ExpressionNode notChild = nlExp.getChildExps().get(0);
    if (notChild instanceof LeafExpressionNode) {
      return nlExp;
    }
    NonLeafExpressionNode nlNotChild = (NonLeafExpressionNode) notChild;
    if (nlNotChild.getOperator() == Operator.NOT) {
      // negate the negate
      return nlNotChild.getChildExps().get(0);
    }
    Operator negateOp = nlNotChild.getOperator() == Operator.AND ? Operator.OR : Operator.AND;
    NonLeafExpressionNode newNode = new NonLeafExpressionNode(negateOp);
    for (ExpressionNode expNode : nlNotChild.getChildExps()) {
      NonLeafExpressionNode negateNode = new NonLeafExpressionNode(Operator.NOT);
      negateNode.addChildExp(expNode.deepClone());
      newNode.addChildExp(expand(negateNode));
    }
    return newNode;
  }
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