8284920: Incorrect Token type causes XPath expression to return incor…

…rect results

Backport-of: 81a8e2f8b32ad27aed45c4f6966e8d9ecf8b0fc9

src/java.xml/share/classes/com/sun/org/apache/xpath/internal/compiler/Token.java

@@ -58,6 +58,7 @@ public final class Token {
     static final String DIV = "div";
     static final String MOD = "mod";
     static final String QUO = "quo";
+    static final String DOT_STR = ".";
     static final String DDOT = "..";
     static final String DCOLON = "::";
     static final String ATTR = "attribute";

src/java.xml/share/classes/com/sun/org/apache/xpath/internal/compiler/XPathParser.java

@@ -35,7 +35,7 @@
  * Tokenizes and parses XPath expressions. This should really be named
  * XPathParserImpl, and may be renamed in the future.
  * @xsl.usage general
- * @LastModified: Jan 2022
+ * @LastModified: Apr 2022
  */
 public class XPathParser
 {
@@ -1661,7 +1661,7 @@ protected boolean Step() throws TransformerException
       opPos = m_ops.getOp(OpMap.MAPINDEX_LENGTH);
     }
 
-    if (tokenIs(Token.DOT))
+    if (tokenIs(Token.DOT_STR))
     {
       nextToken();
 

test/jaxp/javax/xml/jaxp/unittest/xpath/XPathExpTest.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package xpath;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathFactory;
+import org.testng.Assert;
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Test;
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+
+/*
+ * @test
+ * @bug 8284920
+ * @run testng/othervm xpath.XPathExpTest
+ * @summary Tests for various XPath Expressions.
+ */
+public class XPathExpTest {
+
+    private static final String XML =
+              "<root>"
+            + "   <child id='1'>"
+            + "       <grandchild id='1'/>"
+            + "       <grandchild id='2'/>"
+            + "   </child>"
+            + "   <child id='2'>"
+            + "       <grandchild id='3'/>"
+            + "       <grandchild id='4'/>"
+            + "   </child>"
+            + "   <child id='3'>"
+            + "       <grandchild id='5'/>"
+            + "       <grandchild id='6'/>"
+            + "   </child>"
+            + " </root>";
+    private static final String PARENT_CHILD = "child(2)";
+
+    /*
+     * DataProvider for XPath expression test.
+     * Data columns:
+     *  see parameters of the test "test"
+     */
+    @DataProvider(name = "xpathExp")
+    public Object[][] getXPathExpression() throws Exception {
+
+        return new Object[][]{
+            // verifies various forms of the parent axis
+            {"/root/child[@id='2']", PARENT_CHILD},
+            {"//grandchild[@id='3']/parent::child", PARENT_CHILD},
+            {"//grandchild[@id='3']/parent::node()", PARENT_CHILD},
+            {"//grandchild[@id='3']/parent::*", PARENT_CHILD},
+            {"//grandchild[@id='3']/parent::node()/grandchild[@id='4']/parent::node()", PARENT_CHILD},
+            {"//grandchild[@id='3']/..", PARENT_CHILD},
+            {"//grandchild[@id='3']/../grandchild[@id='4']/..", PARENT_CHILD},
+            {"//grandchild[@id='3']/parent::node()/grandchild[@id='4']/..", PARENT_CHILD},
+
+            // verifies various forms of the self axis
+            {"/root/child[@id='2']/self::child", PARENT_CHILD},
+            {"/root/child[@id='2']/self::node()", PARENT_CHILD},
+            {"/root/child[@id='2']/self::*", PARENT_CHILD},
+            {"self::node()/root/child[@id='2']", PARENT_CHILD},
+            {"/root/child[@id='2']/.", PARENT_CHILD},
+            {"./root/child[@id='2']", PARENT_CHILD},
+            {".//child[@id='2']", PARENT_CHILD},
+            {"//grandchild[@id='3']/./../grandchild[@id='4']/..", PARENT_CHILD},
+            {"//grandchild[@id='3']/./parent::node()/grandchild[@id='4']/..", PARENT_CHILD},
+        };
+    }
+
+    /**
+     * Verifies XPath expressions.
+     *
+     * @param exp XPath expression
+     * @param expected expected result
+     * @throws Exception
+     */
+    @Test(dataProvider = "xpathExp")
+    void test(String exp, String expected) throws Exception {
+        Document doc = getDoc(XML);
+        XPath xPath = XPathFactory.newInstance().newXPath();
+        NodeList nl = (NodeList) xPath.evaluate(exp, doc, XPathConstants.NODESET);
+        Node child = nl.item(0);
+        Assert.assertEquals(
+                child.getNodeName() + "(" + child.getAttributes().item(0).getNodeValue() + ")",
+                expected);
+    }
+
+    Document getDoc(String xml) throws Exception {
+        DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
+        dfactory.setNamespaceAware(true);
+        DocumentBuilder docBuilder = dfactory.newDocumentBuilder();
+        InputStream is = new ByteArrayInputStream(xml.getBytes());
+        return docBuilder.parse(is);
+    }
+}