Replace IPath.makeRelativeTo call with reflection

I broke the build because on Eclipse 3.4 there is no makeRelativeTo
method on IPath. This replaces that call with reflection. This won't
work on 3.4, but it's a quick fix for the broken build.

Change-Id: Ia917cf5a745f76bbb96f59fae93e2a4fc4f5f900

diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/LayoutCanvas.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/LayoutCanvas.java
index c0e69b1..e5113f8 100755 (executable)
--- a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/LayoutCanvas.java
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/LayoutCanvas.java
@@ -83,6 +83,8 @@ import org.eclipse.ui.internal.ide.IDEWorkbenchMessages;
 import org.eclipse.ui.views.contentoutline.IContentOutlinePage;
 import org.w3c.dom.Node;
 
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -710,7 +712,31 @@ class LayoutCanvas extends Canvas {
         IPath workspacePath = workspace.getLocation();
         IEditorSite editorSite = graphicalEditor.getEditorSite();
         if (workspacePath.isPrefixOf(filePath)) {
-            IPath relativePath = filePath.makeRelativeTo(workspacePath);
+            // This apparently doesn't work in 3.4:
+            //     IPath relativePath = filePath.makeRelativeTo(workspacePath);
+            // Use reflection as a build hotfix.
+            // FIXME: This won't work on 3.4 but we're talking about dropping 3.4 support
+            // shortly since most Eclipse users have migrated to 3.5 + 3.6.
+            IPath relativePath = null;
+            try {
+                Method method = IPath.class.getDeclaredMethod("makeRelativeTo", //$NON-NLS-1$
+                        new Class<?>[] {
+                            IPath.class
+                        });
+                relativePath = (IPath) method.invoke(filePath, new Object[] {
+                    workspacePath
+                });
+            } catch (SecurityException e) {
+            } catch (NoSuchMethodException e) {
+            } catch (IllegalArgumentException e) {
+            } catch (IllegalAccessException e) {
+            } catch (InvocationTargetException e) {
+            }
+
+            if (relativePath == null) {
+                return;
+            }
+
             IResource xmlFile = workspace.findMember(relativePath);
             try {
                 EditorUtility.openInEditor(xmlFile, true);