jdk/src/jdk.management/share/classes/com/sun/management/internal/VMOptionCompositeData.java
changeset 30355 e37c7eba132f
parent 25859 3317bb8137f4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/jdk.management/share/classes/com/sun/management/internal/VMOptionCompositeData.java	Fri Apr 17 09:40:02 2015 +0200
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2005, 2015, 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 com.sun.management.internal;
+
+import com.sun.management.VMOption;
+import com.sun.management.VMOption.Origin;
+import javax.management.openmbean.CompositeType;
+import javax.management.openmbean.CompositeData;
+import javax.management.openmbean.CompositeDataSupport;
+import javax.management.openmbean.OpenDataException;
+import sun.management.LazyCompositeData;
+import sun.management.MappedMXBeanType;
+
+/**
+ * A CompositeData for VMOption for the local management support.
+ * This class avoids the performance penalty paid to the
+ * construction of a CompositeData use in the local case.
+ */
+public class VMOptionCompositeData extends LazyCompositeData {
+    private final VMOption option;
+
+    private VMOptionCompositeData(VMOption option) {
+        this.option = option;
+    }
+
+    public VMOption getVMOption() {
+        return option;
+    }
+
+    public static CompositeData toCompositeData(VMOption option) {
+        VMOptionCompositeData vcd = new VMOptionCompositeData(option);
+        return vcd.getCompositeData();
+    }
+
+    protected CompositeData getCompositeData() {
+        // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH
+        // vmOptionItemNames!
+        final Object[] vmOptionItemValues = {
+            option.getName(),
+            option.getValue(),
+            option.isWriteable(),
+            option.getOrigin().toString(),
+        };
+
+        try {
+            return new CompositeDataSupport(vmOptionCompositeType,
+                                            vmOptionItemNames,
+                                            vmOptionItemValues);
+        } catch (OpenDataException e) {
+            // Should never reach here
+            throw new AssertionError(e);
+        }
+    }
+
+    private static final CompositeType vmOptionCompositeType;
+    static {
+        try {
+            vmOptionCompositeType = (CompositeType)
+                MappedMXBeanType.toOpenType(VMOption.class);
+        } catch (OpenDataException e) {
+            // Should never reach here
+            throw new AssertionError(e);
+        }
+    }
+
+    static CompositeType getVMOptionCompositeType() {
+        return vmOptionCompositeType;
+    }
+
+    private static final String NAME      = "name";
+    private static final String VALUE     = "value";
+    private static final String WRITEABLE = "writeable";
+    private static final String ORIGIN    = "origin";
+
+    private static final String[] vmOptionItemNames = {
+        NAME,
+        VALUE,
+        WRITEABLE,
+        ORIGIN,
+    };
+
+    public static String getName(CompositeData cd) {
+        return getString(cd, NAME);
+    }
+    public static String getValue(CompositeData cd) {
+        return getString(cd, VALUE);
+    }
+    public static Origin getOrigin(CompositeData cd) {
+        String o = getString(cd, ORIGIN);
+        return Enum.valueOf(Origin.class, o);
+    }
+    public static boolean isWriteable(CompositeData cd) {
+        return getBoolean(cd, WRITEABLE);
+    }
+
+    /** Validate if the input CompositeData has the expected
+     * CompositeType (i.e. contain all attributes with expected
+     * names and types).
+     */
+    public static void validateCompositeData(CompositeData cd) {
+        if (cd == null) {
+            throw new NullPointerException("Null CompositeData");
+        }
+
+        if (!isTypeMatched(vmOptionCompositeType, cd.getCompositeType())) {
+            throw new IllegalArgumentException(
+                "Unexpected composite type for VMOption");
+        }
+    }
+
+    private static final long serialVersionUID = -2395573975093578470L;
+}