Found and fixed duplicate method definitions for the same API

CHANGES.md

@@ -49,6 +49,7 @@ Features
 * Loosen OSGI OS name matching to accommodate Windows 8 family - Niels Bertram.
 * [#436] (https://github.com/twall/jna/pull/469): Added basic Pdh API implementation to 'com.sun.jna.platform.win32' - [@lgoldstein](https://github.com/lgoldstein).
 * [#481] (https://github.com/twall/jna/pull/481): Added volume management functions to 'com.sun.jna.platform.win32' - [@lgoldstein](https://github.com/lgoldstein).
+* [#483] (https://github.com/twall/jna/pull/483): Found and fixed duplicate method definitions for the same API in 'com.sun.jna.platform.win32' - [@lgoldstein](https://github.com/lgoldstein).
 
 Bug Fixes
 ---------

contrib/platform/src/com/sun/jna/platform/win32/WinDef.java

@@ -358,6 +358,18 @@ public HICON() {
 
         }
 
+        /**
+         * Instantiates a new hicon from a handle - this is required since
+         * in Win32 API HANDLE and HICON are the same, whereas in Java they
+         * are not, so in order to "cast" the handle we need this
+         * constructor
+         *
+         * @param handle The {@link Handle}
+         */
+        public HICON(HANDLE handle) {
+            this(handle.getPointer());
+        }
+
         /**
          * Instantiates a new hicon.
          *
@@ -743,6 +755,7 @@ public class RECT extends Structure {
          *
          * @see com.sun.jna.Structure#getFieldOrder()
          */
+        @Override
         protected List getFieldOrder() {
             return Arrays.asList(new String[] { "left", "top", "right",
                                                 "bottom" });
@@ -762,6 +775,7 @@ public Rectangle toRectangle() {
          *
          * @see com.sun.jna.Structure#toString()
          */
+        @Override
         public String toString() {
             return "[(" + left + "," + top + ")(" + right + "," + bottom + ")]";
         }
@@ -1062,6 +1076,7 @@ public POINT(int x, int y) {
          *
          * @see com.sun.jna.Structure#getFieldOrder()
          */
+        @Override
         protected List getFieldOrder() {
             return Arrays.asList(new String[] { "x", "y" });
         }
@@ -1513,14 +1528,14 @@ public CHAR getValue() {
 	 * handle to an OpenGL rendering context
 	 */
 	public static class HGLRC extends HANDLE {
-	
+
 	    /**
 	     * Instantiates a new HGLRC .
 	     */
 	    public HGLRC() {
-	
+
 	    }
-	
+
 	    /**
 	     * Instantiates a new HGLRC .
 	     *
@@ -1531,7 +1546,7 @@ public HGLRC(Pointer p) {
 	        super(p);
 	    }
 	}
-	
+
     /**
      * handle to an OpenGL rendering context
      */
@@ -1555,6 +1570,6 @@ public HGLRCByReference(HGLRC h) {
         }
     }
 
-	
-	
+
+
 }

contrib/platform/test/com/sun/jna/platform/win32/AbstractWin32TestSupport.java

@@ -12,17 +12,52 @@
  */
 package com.sun.jna.platform.win32;
 
+import java.lang.reflect.Method;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
 import com.sun.jna.platform.AbstractPlatformTestSupport;
 import com.sun.jna.platform.win32.WinNT.HANDLE;
 
-/**
- * @author lgoldstein
- */
 public abstract class AbstractWin32TestSupport extends AbstractPlatformTestSupport {
     protected AbstractWin32TestSupport() {
         super();
     }
 
+    /**
+     * Makes sure that the method names (which represent APIs) do not repeat
+     * themselves. This check is in order where APIs are WIN32 API <U>functions</U>
+     * since these are C functions - which means no overloading is possible.
+     *
+     * @param ifc The interface (not checked) class to test
+     * @see #detectDuplicateMethods(Class)
+     */
+    public static final void assertNoDuplicateMethodsNames(Class<?> ifc) {
+        Collection<String> dupSet = detectDuplicateMethods(ifc);
+        assertTrue("Duplicate names found in " + ifc.getSimpleName() + ": " + dupSet, dupSet.isEmpty());
+    }
+
+    /**
+     * Checks if there are methods with the same name - regardless of the signature
+     *
+     * @param ifc The interface (not checked) class to test
+     * @return The {@link Set} of duplicate names - empty if no duplicates
+     */
+    public static final Set<String> detectDuplicateMethods(Class<?> ifc) {
+        Method[] methods = ifc.getMethods();
+        Set<String> nameSet = new HashSet<String>(methods.length);
+        Set<String> dupSet = new HashSet<String>();
+        for (Method m : methods) {
+            String name = m.getName();
+            if (!nameSet.add(name)) {
+                dupSet.add(name);
+            }
+        }
+
+        return dupSet;
+    }
+
     /**
      * Checks if the API call result is {@code true}. If not, then calls
      * {@link Kernel32#GetLastError()} and fails with the error code.
@@ -35,15 +70,15 @@ public static final void assertCallSucceeded(String message, boolean result) {
         if (result) {
             return;
         }
-        
+
         int hr = Kernel32.INSTANCE.GetLastError();
         if (hr == WinError.ERROR_SUCCESS) {
             fail(message + " failed with unknown reason code");
         } else {
             fail(message + " failed: hr=" + hr + " - 0x" + Integer.toHexString(hr));
         }
     }
-    
+
     /**
      * Checks if the status code is ERROR_SUCCESS
      * @param message Message to display if code is an error
@@ -59,7 +94,7 @@ public static final void assertErrorSuccess(String message, int statusCode, bool
             assertEquals(message, WinError.ERROR_SUCCESS, statusCode);
         }
     }
-    
+
     /**
      * Makes sure that the handle argument is not {@code null} or {@link WinBase#INVALID_HANDLE_VALUE}.
      * If invalid handle detected, then it invokes {@link Kernel32#GetLastError()}