GH-354 logical value for UnixPath and WindowsPath added

Author: thurka

visualvm/libs.profiler/profiler.heapwalker/src/org/graalvm/visualvm/lib/profiler/heapwalk/details/jdk/NioDetailsProvider.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2021, 2021, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 org.graalvm.visualvm.lib.profiler.heapwalk.details.jdk;
+
+import java.nio.charset.Charset;
+import java.util.List;
+import org.graalvm.visualvm.lib.jfluid.heap.Heap;
+import org.graalvm.visualvm.lib.jfluid.heap.Instance;
+import org.graalvm.visualvm.lib.profiler.heapwalk.details.spi.DetailsProvider;
+import org.graalvm.visualvm.lib.profiler.heapwalk.details.spi.DetailsUtils;
+import org.openide.util.lookup.ServiceProvider;
+
+/**
+ *
+ * @author Tomas Hurka
+ */
+@ServiceProvider(service = DetailsProvider.class)
+public final class NioDetailsProvider extends DetailsProvider.Basic {
+
+    private static final String UNIXPATH_MASK = "sun.nio.fs.UnixPath"; // NOI18N
+    private static final String WINDOWSPATH_MASK = "sun.nio.fs.WindowsPath"; // NOI18N
+
+    private long lastHeapId;
+    private Charset lastJnuEncoding;
+
+    public NioDetailsProvider() {
+        super(UNIXPATH_MASK, WINDOWSPATH_MASK);
+    }
+
+    public String getDetailsString(String className, Instance instance) {
+        if (UNIXPATH_MASK.equals(className)) {
+            String path = DetailsUtils.getInstanceFieldString(instance, "stringValue");   // NOI18N
+            if (path != null) {
+                return path;
+            }
+            Charset encoding = getJnuEncoding(instance.getJavaClass().getHeap());
+            List<String> pathItems = DetailsUtils.getPrimitiveArrayFieldValues(instance, "path");                  // NOI18N
+            byte[] pathArr = DetailsUtils.getByteArray(pathItems);
+            if (pathArr != null) {
+                return new String(pathArr, encoding);
+            }
+        } else if (WINDOWSPATH_MASK.equals(className)) {
+            return DetailsUtils.getInstanceFieldString(instance, "path");   // NOI18N
+        }
+        return null;
+    }
+
+    private Charset getJnuEncoding(Heap heap) {
+        if (lastHeapId != System.identityHashCode(heap)) {
+            String encoding = heap.getSystemProperties().getProperty("sun.jnu.encoding", "UTF-8"); // NOI18N
+            lastJnuEncoding = Charset.forName(encoding);
+            lastHeapId = System.identityHashCode(heap);
+        }
+        return lastJnuEncoding;
+    }
+
+}