/*
* Copyright (c) 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
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package sun.management;
import java.lang.management.ThreadInfo;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Predicate;
import javax.management.openmbean.ArrayType;
import javax.management.openmbean.CompositeType;
import javax.management.openmbean.OpenDataException;
import javax.management.openmbean.OpenType;
import javax.management.openmbean.SimpleType;
import javax.management.openmbean.TabularType;
import static sun.management.Util.toStringArray;
/**
* Provides simplistic support for versioning of {@linkplain CompositeType} instances
* based on the latest version and filtering out certain items.
*/
final class TypeVersionMapper {
private static final class Singleton {
private final static TypeVersionMapper INSTANCE = new TypeVersionMapper();
}
final static String V5 = "J2SE 5.0";
final static String V6 = "Java SE 6";
private final Map<String, Map<String, Predicate<String>>> filterMap;
private TypeVersionMapper() {
filterMap = new HashMap<>();
setupStackTraceElement();
setupThreadInfo();
}
public static TypeVersionMapper getInstance() {
return Singleton.INSTANCE;
}
private void setupStackTraceElement() {
Map<String, Predicate<String>> filter = new HashMap<>();
filterMap.put(StackTraceElement.class.getName(), filter);
filter.put(V5, StackTraceElementCompositeData::isV6Attribute);
filter.put(V6, StackTraceElementCompositeData::isV6Attribute);
}
private void setupThreadInfo() {
Map<String, Predicate<String>> filter = new HashMap<>();
filterMap.put(ThreadInfo.class.getName(), filter);
filter.put(V5, ThreadInfoCompositeData::isV5Attribute);
filter.put(V6, ThreadInfoCompositeData::isV6Attribute);
}
/**
* Retrieves the specified version of a {@linkplain CompositeType} instance.
* @param type The current (latest) version of {@linkplain CompositeType}
* @param version The version identifier (eg. {@linkplain TypeVersionMapper#V5})
* @return Returns the {@linkplain CompositeType} corresponding to the requested
* version.
* @throws OpenDataException
*/
CompositeType getVersionedCompositeType(CompositeType type, String version)
throws OpenDataException
{
Predicate<String> filter = getFilter(type.getTypeName(), version);
if (filter == null) {
return type;
}
List<String> itemNames = new ArrayList<>();
List<String> itemDesc = new ArrayList<>();
List<OpenType<?>> itemTypes = new ArrayList<>();
for(String item : type.keySet()) {
if (filter.test(item)) {
itemNames.add(item);
itemDesc.add(type.getDescription(item));
itemTypes.add(getVersionedType(
type.getType(item),
version
));
}
}
return new CompositeType(
type.getTypeName(),
version != null ? version + " " + type.getDescription() : type.getDescription(),
itemNames.toArray(new String[itemNames.size()]),
itemDesc.toArray(new String[itemDesc.size()]),
itemTypes.toArray(new OpenType<?>[itemTypes.size()])
);
}
private OpenType<?> getVersionedType(OpenType<?> type, String version)
throws OpenDataException
{
if (type instanceof ArrayType) {
return getVersionedArrayType((ArrayType)type, version);
}
if (type instanceof CompositeType) {
return getVersionedCompositeType((CompositeType)type, version);
}
if (type instanceof TabularType) {
return getVersionedTabularType((TabularType)type, version);
}
return type;
}
private ArrayType<?> getVersionedArrayType(ArrayType<?> type, String version)
throws OpenDataException
{
if (type.isPrimitiveArray()) {
return type;
}
OpenType<?> ot = getVersionedType(
type.getElementOpenType(),
version
);
if (ot instanceof SimpleType) {
return new ArrayType<>((SimpleType<?>)ot, type.isPrimitiveArray());
} else {
return new ArrayType<>(type.getDimension(), ot);
}
}
private TabularType getVersionedTabularType(TabularType type, String version)
throws OpenDataException
{
CompositeType ct = getVersionedCompositeType(
type.getRowType(),
version
);
if (ct != null) {
return new TabularType(
type.getTypeName(), type.getDescription(), ct,
toStringArray(type.getIndexNames()));
}
return null;
}
private Predicate<String> getFilter(String type, String version) {
Map<String, Predicate<String>> versionMap = filterMap.get(type);
if (versionMap == null) {
return null;
}
return versionMap.get(version);
}
}