8013900: More warnings compiling jaxp.

Summary: Some internal implementation classes in Jaxp were redefining equals() without redefining hashCode(). This patch adds hashCode() methods that are consistent with equals().
Reviewed-by: chegar, joehw

test/javax/xml/jaxp/PrecisionDecimalDV/XPrecisionDecimalToString.java

+/*
+ * Copyright (c) 2013, 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.
+ */
+
+import java.lang.reflect.Method;
+
+/**
+ * @test
+ * @bug 8013900
+ * @summary More warning compiling jaxp.
+ *   This test only test one of the methods used to implement hashCode()
+ *   in com.sun.org.apache.xerces.internal.impl.dv.xs.PrecisionDecimalDV$XPrecisionDecimal.
+ *   Since that method is private the test unfortunately needs to use reflection
+ *   to invoke the method.
+ * @run main XPrecisionDecimalToString
+ * @author Daniel Fuchs
+ */
+public class XPrecisionDecimalToString {
+
+    private static final String className =
+            "com.sun.org.apache.xerces.internal.impl.dv.xs.PrecisionDecimalDV$XPrecisionDecimal";
+    private static final String methodName = "canonicalToStringForHashCode";
+    private static final Class<?>[] signature = { String.class, String.class, int.class, int.class };
+    private static Method method;
+
+    // Invokes XPrecisionDecimal.canonicalToStringForHashCode through reflection,
+    // because the method is private...
+    //
+    // Construct a canonical String representation of this number
+    // for the purpose of deriving a hashCode value compliant with
+    // equals.
+    // The toString representation will be:
+    // NaN for NaN, INF for +infinity, -INF for -infinity, 0 for zero,
+    // and [1-9]\.[0-9]*[1-9]?(E[1-9][0-9]*)? for other numbers.
+    private static String canonicalToStringForHashCode(String ivalue, String fvalue, int sign, int pvalue) {
+        try {
+            if (method == null) {
+                Class<?> type = Class.forName(className);
+                method = type.getDeclaredMethod(methodName, signature);
+                method.setAccessible(true);
+            }
+        } catch (Exception x) {
+            throw new Error("Impossible to find '"+className+"."+methodName+"': "+ x, x);
+        }
+        try {
+            return (String) method.invoke(null, new Object[] {ivalue, fvalue, sign, pvalue} );
+        } catch(Exception x) {
+            throw new Error("Failed to invoke "+className+"."+methodName+"(\""+
+                    ivalue+"\", \""+fvalue+"\", "+sign+", "+pvalue+"): " +x, x);
+        }
+    }
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        test("123","7890",-1,0,"-1.23789E2");
+        test("0","007890",-1,0,"-7.89E-3");
+        test("123","7890",1,0,"1.23789E2");
+        test("0","007890",1,0,"7.89E-3");
+        test("123","7890",1,10,"1.23789E12");
+        test("0","007890",1,33,"7.89E30");
+        test("INF","",1,0,"INF");
+        test("INF","",-1,0,"-INF");
+        test("NaN","",0,0,"NaN");
+        test("0","",1,0,"0");
+        test("00000","00000",1,10,"0");
+        test("00000","00000",-1,10,"0");
+        test("00000","000001",-1,-10,"-1E-16");
+    }
+
+    private static void test(String ival, String fval, int sign, int pvalue, String expected) {
+        final String canonical = canonicalToStringForHashCode(ival, fval, sign, pvalue);
+        System.out.println((sign == -1 ? "-" : "") + ival +
+                ("INF".equals(ival) || "NaN".equals(ival) ? ""
+                 : ( "." + fval + "E" + pvalue))
+                + " => "+ canonical);
+        if (!expected.equals(canonical)) {
+            throw new Error("expected: "+expected+" got: "+ canonical);
+        }
+    }
+
+
+}