/*
 * Copyright (c) 2004, 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 sun.management;
import java.lang.management.MemoryUsage;
import java.lang.management.MemoryNotificationInfo;
import java.lang.management.MonitorInfo;
import java.lang.management.LockInfo;
import java.lang.management.ThreadInfo;
import java.lang.reflect.*;
import java.util.List;
import java.util.Map;
import java.util.*;
import java.io.InvalidObjectException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import javax.management.openmbean.*;
import static javax.management.openmbean.SimpleType.*;

A mapped mxbean type maps a Java type to an open type.
Only the following Java types are mappable
(currently required by the platform MXBeans):

  
Primitive types
  
Wrapper classes such java.lang.Integer, etc
  
Classes with only getter methods and with a static "from" method
     that takes a CompositeData argument.
  
E[] where E is a type of 1-4 (can be multi-dimensional array)
  
List<E> where E is a type of 1-3
  
Map<K, V> where K and V are a type of 1-4

OpenDataException will be thrown if a Java type is not supported.
/**
 * A mapped mxbean type maps a Java type to an open type.
 * Only the following Java types are mappable
 * (currently required by the platform MXBeans):
 * <ol>
 *   <li>Primitive types</li>
 *   <li>Wrapper classes such java.lang.Integer, etc</li>
 *   <li>Classes with only getter methods and with a static "from" method
 *      that takes a CompositeData argument.</li>
 *   <li>{@code E[]} where {@code E} is a type of 1-4 (can be multi-dimensional array)</li>
 *   <li>{@code List<E>} where E is a type of 1-3</li>
 *   <li>{@code Map<K, V>} where {@code K} and {@code V} are a type of 1-4</li>
 * </ol>
 *
 * OpenDataException will be thrown if a Java type is not supported.
 */
// Suppress unchecked cast warnings at line 442, 523 and 546
// Suppress unchecked calls at line 235, 284, 380 and 430.
@SuppressWarnings("unchecked")
public abstract class MappedMXBeanType {
    private static final WeakHashMap<Type,MappedMXBeanType> convertedTypes =
        new WeakHashMap<>();

    boolean  isBasicType = false;
    OpenType<?> openType = inProgress;
    Class<?>    mappedTypeClass;

    static synchronized MappedMXBeanType newMappedType(Type javaType)
            throws OpenDataException {

        MappedMXBeanType mt = null;
        if (javaType instanceof Class) {
            final Class<?> c = (Class<?>) javaType;
            if (c.isEnum()) {
                mt = new EnumMXBeanType(c);
            } else if (c.isArray()) {
                mt = new ArrayMXBeanType(c);
            } else {
                mt = new CompositeDataMXBeanType(c);
            }
        } else if (javaType instanceof ParameterizedType) {
            final ParameterizedType pt = (ParameterizedType) javaType;
            final Type rawType = pt.getRawType();
            if (rawType instanceof Class) {
                final Class<?> rc = (Class<?>) rawType;
                if (rc == List.class) {
                    mt = new ListMXBeanType(pt);
                } else if (rc == Map.class) {
                    mt = new MapMXBeanType(pt);
                }
            }
        } else if (javaType instanceof GenericArrayType) {
           final GenericArrayType t = (GenericArrayType) javaType;
           mt = new GenericArrayMXBeanType(t);
        }
        // No open type mapped for the javaType
        if (mt == null) {
            throw new OpenDataException(javaType +
                " is not a supported MXBean type.");
        }
        convertedTypes.put(javaType, mt);
        return mt;
    }

    // basic types do not require data mapping
    static synchronized MappedMXBeanType newBasicType(Class<?> c, OpenType<?> ot)
            throws OpenDataException {
        MappedMXBeanType mt = new BasicMXBeanType(c, ot);
        convertedTypes.put(c, mt);
        return mt;
    }

    public static synchronized MappedMXBeanType getMappedType(Type t)
            throws OpenDataException {
        MappedMXBeanType mt = convertedTypes.get(t);
        if (mt == null) {
            mt = newMappedType(t);
        }

        if (mt.getOpenType() instanceof InProgress) {
            throw new OpenDataException("Recursive data structure");
        }
        return mt;
    }

    // Convert a class to an OpenType
    public static synchronized OpenType<?> toOpenType(Type t)
            throws OpenDataException {
        MappedMXBeanType mt = getMappedType(t);
        return mt.getOpenType();
    }

    public static Object toJavaTypeData(Object openData, Type t)
            throws OpenDataException, InvalidObjectException {
        if (openData == null) {
            return null;
        }
        MappedMXBeanType mt = getMappedType(t);
        return mt.toJavaTypeData(openData);
    }

    public static Object toOpenTypeData(Object data, Type t)
            throws OpenDataException {
        if (data == null) {
            return null;
        }
        MappedMXBeanType mt = getMappedType(t);
        return mt.toOpenTypeData(data);
    }

    // Return the mapped open type
    public OpenType<?> getOpenType() {
        return openType;
    }

    boolean isBasicType() {
        return isBasicType;
    }

    // Return the type name of the mapped open type
    // For primitive types, the type name is the same as the javaType
    // but the mapped open type is the wrapper class
    String getTypeName() {
        return getMappedTypeClass().getName();
    }

    // Return the mapped open type
    Class<?> getMappedTypeClass() {
        return mappedTypeClass;
    }

    abstract Type getJavaType();

    // return name of the class or the generic type
    abstract String getName();

    public abstract Object toOpenTypeData(Object javaTypeData)
        throws OpenDataException;

    public abstract Object toJavaTypeData(Object openTypeData)
        throws OpenDataException, InvalidObjectException;

    // Basic Types - Classes that do not require data conversion
    //               including primitive types and all SimpleType
    //
    //   Mapped open type: SimpleType for corresponding basic type
    //
    // Data Mapping:
    //   T <-> T (no conversion)
    //
    static class BasicMXBeanType extends MappedMXBeanType {
        final Class<?> basicType;
        BasicMXBeanType(Class<?> c, OpenType<?> openType) {
            this.basicType = c;
            this.openType = openType;
            this.mappedTypeClass = c;
            this.isBasicType = true;
        }

        Type getJavaType() {
            return basicType;
        }

        String getName() {
            return basicType.getName();
        }

        public Object toOpenTypeData(Object data) throws OpenDataException {
            return data;
        }

        public Object toJavaTypeData(Object data)
            throws OpenDataException, InvalidObjectException {

            return data;
        }
    }


    // Enum subclasses
    //   Mapped open type - String
    //
    // Data Mapping:
    //   Enum <-> enum's name
    //
    static class EnumMXBeanType extends MappedMXBeanType {
        @SuppressWarnings("rawtypes")
        final Class enumClass;
        EnumMXBeanType(Class<?> c) {
            this.enumClass = c;
            this.openType = STRING;
            this.mappedTypeClass = String.class;
        }

        Type getJavaType() {
            return enumClass;
        }

        String getName() {
            return enumClass.getName();
        }

        public Object toOpenTypeData(Object data) throws OpenDataException {
            return ((Enum) data).name();
        }

        public Object toJavaTypeData(Object data)
            throws OpenDataException, InvalidObjectException {

            try {
                return Enum.valueOf(enumClass, (String) data);
            } catch (IllegalArgumentException e) {
                // missing enum constants
                final InvalidObjectException ioe =
                    new InvalidObjectException("Enum constant named " +
                    (String) data + " is missing");
                ioe.initCause(e);
                throw ioe;
            }
        }
    }

    // Array E[]
    //   Mapped open type - Array with element of OpenType for E
    //
    // Data Mapping:
    //   E[] <-> openTypeData(E)[]
    //
    static class ArrayMXBeanType extends MappedMXBeanType {
        final Class<?> arrayClass;
        protected MappedMXBeanType componentType;
        protected MappedMXBeanType baseElementType;

        ArrayMXBeanType(Class<?> c) throws OpenDataException {
            this.arrayClass = c;
            this.componentType = getMappedType(c.getComponentType());

            StringBuilder className = new StringBuilder();
            Class<?> et = c;
            int dim;
            for (dim = 0; et.isArray(); dim++) {
                className.append('[');
                et = et.getComponentType();
            }
            baseElementType = getMappedType(et);
            if (et.isPrimitive()) {
                className = new StringBuilder(c.getName());
            } else {
                className.append('L').append(baseElementType.getTypeName()).append(';');
            }
            try {
                mappedTypeClass = Class.forName(className.toString());
            } catch (ClassNotFoundException e) {
                final OpenDataException ode =
                    new OpenDataException("Cannot obtain array class");
                ode.initCause(e);
                throw ode;
            }

            openType = new ArrayType<>(dim, baseElementType.getOpenType());
        }

        protected ArrayMXBeanType() {
            arrayClass = null;
        };

        Type getJavaType() {
            return arrayClass;
        }

        String getName() {
            return arrayClass.getName();
        }

        public Object toOpenTypeData(Object data) throws OpenDataException {
            // If the base element type is a basic type
            // return the data as no conversion is needed.
            // Primitive types are not converted to wrappers.
            if (baseElementType.isBasicType()) {
                return data;
            }

            final Object[] array = (Object[]) data;
            final Object[] openArray = (Object[])
                Array.newInstance(componentType.getMappedTypeClass(),
                                  array.length);
            int i = 0;
            for (Object o : array) {
                if (o == null) {
                    openArray[i] = null;
                } else {
                    openArray[i] = componentType.toOpenTypeData(o);
                }
                i++;
            }
            return openArray;
        }


        public Object toJavaTypeData(Object data)
            throws OpenDataException, InvalidObjectException {

            // If the base element type is a basic type
            // return the data as no conversion is needed.
            if (baseElementType.isBasicType()) {
                return data;
            }

            final Object[] openArray = (Object[]) data;
            final Object[] array = (Object[])
                Array.newInstance((Class) componentType.getJavaType(),
                                  openArray.length);
            int i = 0;
            for (Object o : openArray) {
                if (o == null) {
                    array[i] = null;
                } else {
                    array[i] = componentType.toJavaTypeData(o);
                }
                i++;
            }
            return array;
        }

    }

    static class GenericArrayMXBeanType extends ArrayMXBeanType {
        final GenericArrayType gtype;
        GenericArrayMXBeanType(GenericArrayType gat) throws OpenDataException {
            this.gtype = gat;
            this.componentType = getMappedType(gat.getGenericComponentType());

            StringBuilder className = new StringBuilder();
            Type elementType = gat;
            int dim;
            for (dim = 0; elementType instanceof GenericArrayType; dim++) {
                className.append('[');
                GenericArrayType et = (GenericArrayType) elementType;
                elementType = et.getGenericComponentType();
            }
            baseElementType = getMappedType(elementType);
            if (elementType instanceof Class && ((Class) elementType).isPrimitive()) {
                className = new StringBuilder(gat.toString());
            } else {
                className.append('L').append(baseElementType.getTypeName()).append(';');
            }
            try {
                mappedTypeClass = Class.forName(className.toString());
            } catch (ClassNotFoundException e) {
                final OpenDataException ode =
                    new OpenDataException("Cannot obtain array class");
                ode.initCause(e);
                throw ode;
            }

            openType = new ArrayType<>(dim, baseElementType.getOpenType());
        }

        Type getJavaType() {
            return gtype;
        }

        String getName() {
            return gtype.toString();
        }
    }

    // List<E>
    //   Mapped open type - Array with element of OpenType for E
    //
    // Data Mapping:
    //   List<E> <-> openTypeData(E)[]
    //
    static class ListMXBeanType extends MappedMXBeanType {
        final ParameterizedType javaType;
        final MappedMXBeanType paramType;
        final String typeName;

        ListMXBeanType(ParameterizedType pt) throws OpenDataException {
            this.javaType = pt;

            final Type[] argTypes = pt.getActualTypeArguments();
            assert(argTypes.length == 1);

            if (!(argTypes[0] instanceof Class)) {
                throw new OpenDataException("Element Type for " + pt +
                   " not supported");
            }
            final Class<?> et = (Class<?>) argTypes[0];
            if (et.isArray()) {
                throw new OpenDataException("Element Type for " + pt +
                   " not supported");
            }
            paramType = getMappedType(et);
            typeName = "List<" + paramType.getName() + ">";

            try {
                mappedTypeClass = Class.forName(
                    "[L" + paramType.getTypeName() + ";");
            } catch (ClassNotFoundException e) {
                final OpenDataException ode =
                    new OpenDataException("Array class not found");
                ode.initCause(e);
                throw ode;
            }
            openType = new ArrayType<>(1, paramType.getOpenType());
        }

        Type getJavaType() {
            return javaType;
        }

        String getName() {
            return typeName;
        }

        public Object toOpenTypeData(Object data) throws OpenDataException {
            final List<Object> list = (List<Object>) data;

            final Object[] openArray = (Object[])
                Array.newInstance(paramType.getMappedTypeClass(),
                                  list.size());
            int i = 0;
            for (Object o : list) {
                openArray[i++] = paramType.toOpenTypeData(o);
            }
            return openArray;
        }

        public Object toJavaTypeData(Object data)
            throws OpenDataException, InvalidObjectException {

            final Object[] openArray = (Object[]) data;
            List<Object> result = new ArrayList<>(openArray.length);
            for (Object o : openArray) {
                result.add(paramType.toJavaTypeData(o));
            }
            return result;
        }
    }

    private static final String KEY   = "key";
    private static final String VALUE = "value";
    private static final String[] mapIndexNames = {KEY};
    private static final String[] mapItemNames = {KEY, VALUE};

    // Map<K,V>
    //   Mapped open type - TabularType with row type:
    //                        CompositeType:
    //                          "key"   of openDataType(K)
    //                          "value" of openDataType(V)
    //                        "key" is the index name
    //
    // Data Mapping:
    //   Map<K,V> <-> TabularData
    //
    static class MapMXBeanType extends MappedMXBeanType {
        final ParameterizedType javaType;
        final MappedMXBeanType keyType;
        final MappedMXBeanType valueType;
        final String typeName;

        MapMXBeanType(ParameterizedType pt) throws OpenDataException {
            this.javaType = pt;

            final Type[] argTypes = pt.getActualTypeArguments();
            assert(argTypes.length == 2);
            this.keyType = getMappedType(argTypes[0]);
            this.valueType = getMappedType(argTypes[1]);


            // FIXME: generate typeName for generic
            typeName = "Map<" + keyType.getName() + "," +
                                valueType.getName() + ">";
            final OpenType<?>[] mapItemTypes = new OpenType<?>[] {
                                                keyType.getOpenType(),
                                                valueType.getOpenType(),
                                            };
            final CompositeType rowType =
                new CompositeType(typeName,
                                  typeName,
                                  mapItemNames,
                                  mapItemNames,
                                  mapItemTypes);

            openType = new TabularType(typeName, typeName, rowType, mapIndexNames);
            mappedTypeClass = javax.management.openmbean.TabularData.class;
        }

        Type getJavaType() {
            return javaType;
        }

        String getName() {
            return typeName;
        }

        public Object toOpenTypeData(Object data) throws OpenDataException {
            final Map<Object,Object> map = (Map<Object,Object>) data;
            final TabularType tabularType = (TabularType) openType;
            final TabularData table = new TabularDataSupport(tabularType);
            final CompositeType rowType = tabularType.getRowType();

            for (Map.Entry<Object, Object> entry : map.entrySet()) {
                final Object key = keyType.toOpenTypeData(entry.getKey());
                final Object value = valueType.toOpenTypeData(entry.getValue());
                final CompositeData row =
                    new CompositeDataSupport(rowType,
                                             mapItemNames,
                                             new Object[] {key, value});
                table.put(row);
            }
            return table;
        }

        public Object toJavaTypeData(Object data)
            throws OpenDataException, InvalidObjectException {

            final TabularData td = (TabularData) data;

            Map<Object, Object> result = new HashMap<>();
            for (CompositeData row : (Collection<CompositeData>) td.values()) {
                Object key = keyType.toJavaTypeData(row.get(KEY));
                Object value = valueType.toJavaTypeData(row.get(VALUE));
                result.put(key, value);
            }
            return result;
        }
    }

    private static final Class<?> COMPOSITE_DATA_CLASS =
        javax.management.openmbean.CompositeData.class;

    // Classes that have a static from method
    //   Mapped open type - CompositeData
    //
    // Data Mapping:
    //   Classes <-> CompositeData
    //
    // The name and type of items for a class are identified from
    // the getter methods. For example, a class defines a method:
    //
    //    public FooType getFoo();
    //
    // The composite data view for this class will contain one
    // item entry for a "foo" attribute and the item type is
    // one of the open types defined in the OpenType class that
    // can be determined in the following manner:
    // o If FooType is a primitive type, the item type a wrapper
    //   class for the corresponding primitive type (such as
    //   Integer, Long, Boolean, etc).
    // o If FooType is of type CompositeData or TabularData,
    //   the item type is FooType.
    // o If FooType is an Enum, the item type is a String and
    //   the value is the name of the enum constant.
    // o If FooType is a class or an interface other than the above,
    //   the item type is CompositeData. The same convention
    //   can be recursively applied to the FooType class when
    //   constructing the composite data for the "foo" attribute.
    // o If FooType is an array, the item type is an array and
    //   its element type is determined as described above.
    //
    static class CompositeDataMXBeanType extends MappedMXBeanType {
        final Class<?> javaClass;
        boolean isCompositeData = false;
        Method fromMethod = null;
        Method toMethod = null;

        CompositeDataMXBeanType(Class<?> c) throws OpenDataException {
            this.javaClass = c;
            this.mappedTypeClass = COMPOSITE_DATA_CLASS;

            // check if a static from method exists
            try {
                fromMethod = AccessController.doPrivileged(new PrivilegedExceptionAction<Method>() {
                        public Method run() throws NoSuchMethodException {
                            return javaClass.getMethod("from", COMPOSITE_DATA_CLASS);
                        }
                    });
            } catch (PrivilegedActionException e) {
                // ignore NoSuchMethodException since we allow classes
                // that has no from method to be embeded in another class.
            }

            if (COMPOSITE_DATA_CLASS.isAssignableFrom(c)) {
                // c implements CompositeData - set openType to null
                // defer generating the CompositeType
                // until the object is constructed
                this.isCompositeData = true;
                this.openType = null;
            } else {
                this.isCompositeData = false;

                // Make a CompositeData containing all the getters
                final Method[] methods =
                    AccessController.doPrivileged(new PrivilegedAction<Method[]>() {
                            public Method[] run() {
                                return javaClass.getMethods();
                            }
                        });
                final List<String> names = new ArrayList<>();
                final List<OpenType<?>> types = new ArrayList<>();

                /* Select public methods that look like "T getX()" or "boolean
                 isX()", where T is not void and X is not the empty
                 string.  Exclude "Class getClass()" inherited from Object.  */
                for (int i = 0; i < methods.length; i++) {
                    final Method method = methods[i];
                    final String name = method.getName();
                    final Type type = method.getGenericReturnType();
                    final String rest;
                    if (name.startsWith("get")) {
                        rest = name.substring(3);
                    } else if (name.startsWith("is") &&
                               type instanceof Class &&
                               ((Class) type) == boolean.class) {
                        rest = name.substring(2);
                    } else {
                        // ignore non-getter methods
                        continue;
                    }

                    if (rest.isEmpty() ||
                        method.getParameterTypes().length > 0 ||
                        type == void.class ||
                        rest.equals("Class")) {

                        // ignore non-getter methods
                        continue;
                    }
                    names.add(decapitalize(rest));
                    types.add(toOpenType(type));
                }

                final String[] nameArray = names.toArray(new String[0]);
                openType = new CompositeType(c.getName(),
                        c.getName(),
                        nameArray, // field names
                        nameArray, // field descriptions
                        types.toArray(new OpenType<?>[0]));
            }
        }

        Type getJavaType() {
            return javaClass;
        }

        String getName() {
            return javaClass.getName();
        }

        public Object toOpenTypeData(Object data) throws OpenDataException {
            if (toMethod != null) {
                try {
                    return toMethod.invoke(null, data);
                } catch (IllegalAccessException e) {
                    // should never reach here
                    throw new AssertionError(e);
                } catch (InvocationTargetException e) {
                    final OpenDataException ode
                            = new OpenDataException("Failed to invoke "
                                    + toMethod.getName() + " to convert " + javaClass.getName()
                                    + " to CompositeData");
                    ode.initCause(e);
                    throw ode;
                }
            }

            if (data instanceof MemoryUsage) {
                return MemoryUsageCompositeData.toCompositeData((MemoryUsage) data);
            }

            if (data instanceof ThreadInfo) {
                return ThreadInfoCompositeData.toCompositeData((ThreadInfo) data);
            }

            if (data instanceof LockInfo) {
                if (data instanceof java.lang.management.MonitorInfo) {
                    return MonitorInfoCompositeData.toCompositeData((MonitorInfo) data);
                }
                return LockInfoCompositeData.toCompositeData((LockInfo) data);
            }

            if (data instanceof MemoryNotificationInfo) {
                return MemoryNotifInfoCompositeData.
                    toCompositeData((MemoryNotificationInfo) data);
            }

            if (isCompositeData) {
                // Classes that implement CompositeData
                //
                // construct a new CompositeDataSupport object
                // so that no other classes are sent over the wire
                CompositeData cd = (CompositeData) data;
                CompositeType ct = cd.getCompositeType();
                String[] itemNames = ct.keySet().toArray(new String[0]);
                Object[] itemValues = cd.getAll(itemNames);
                return new CompositeDataSupport(ct, itemNames, itemValues);
            }

            throw new OpenDataException(javaClass.getName() +
                " is not supported for platform MXBeans");
        }

        public Object toJavaTypeData(Object data)
            throws OpenDataException, InvalidObjectException {

            if (fromMethod == null) {
                throw new AssertionError("Does not support data conversion");
            }

            try {
                return fromMethod.invoke(null, data);
            } catch (IllegalAccessException e) {
                // should never reach here
                throw new AssertionError(e);
            } catch (InvocationTargetException e) {
                final OpenDataException ode =
                    new OpenDataException("Failed to invoke " +
                        fromMethod.getName() + " to convert CompositeData " +
                        " to " + javaClass.getName());
                ode.initCause(e);
                throw ode;
            }
        }
    }

    private static class InProgress<T> extends OpenType<T> {
        private static final String description =
                  "Marker to detect recursive type use -- internal use only!";

        InProgress() throws OpenDataException {
            super("java.lang.String", "java.lang.String", description);
        }

        public String toString() {
            return description;
        }

        public int hashCode() {
            return 0;
        }

        public boolean equals(Object o) {
            return false;
        }

        public boolean isValue(Object o) {
            return false;
        }
        private static final long serialVersionUID = -3413063475064374490L;
    }
    private static final OpenType<?> inProgress;
    static {
        OpenType<?> t;
        try {
            t = new InProgress<>();
        } catch (OpenDataException e) {
            // Should not reach here
            throw new AssertionError(e);
        }
        inProgress = t;
    }

    private static final OpenType<?>[] simpleTypes = {
        BIGDECIMAL, BIGINTEGER, BOOLEAN, BYTE, CHARACTER, DATE,
        DOUBLE, FLOAT, INTEGER, LONG, OBJECTNAME, SHORT, STRING,
        VOID,
    };
    static {
        try {
            for (int i = 0; i < simpleTypes.length; i++) {
                final OpenType<?> t = simpleTypes[i];
                Class<?> c;
                try {
                    c = Class.forName(t.getClassName(), false,
                                      MappedMXBeanType.class.getClassLoader());
                    MappedMXBeanType.newBasicType(c, t);
                } catch (ClassNotFoundException e) {
                    // the classes that these predefined types declare
                    // must exist!
                    throw new AssertionError(e);
                } catch (OpenDataException e) {
                    throw new AssertionError(e);
                }

                if (c.getName().startsWith("java.lang.")) {
                    try {
                        final Field typeField = c.getField("TYPE");
                        final Class<?> primitiveType = (Class<?>) typeField.get(null);
                        MappedMXBeanType.newBasicType(primitiveType, t);
                    } catch (NoSuchFieldException e) {
                        // OK: must not be a primitive wrapper
                    } catch (IllegalAccessException e) {
                        // Should not reach here
                       throw new AssertionError(e);
                    }
                }
            }
        } catch (OpenDataException e) {
            throw new AssertionError(e);
        }
    }

    
Utility method to take a string and convert it to normal Java variable
name capitalization.  This normally means converting the first
character from upper case to lower case, but in the (unusual) special
case when there is more than one character and both the first and
second characters are upper case, we leave it alone.

Thus "FooBah" becomes "fooBah" and "X" becomes "x", but "URL" stays
as "URL".
Params:
name – The string to be decapitalized.
Returns:
 The decapitalized version of the string./**
     * Utility method to take a string and convert it to normal Java variable
     * name capitalization.  This normally means converting the first
     * character from upper case to lower case, but in the (unusual) special
     * case when there is more than one character and both the first and
     * second characters are upper case, we leave it alone.
     * <p>
     * Thus "FooBah" becomes "fooBah" and "X" becomes "x", but "URL" stays
     * as "URL".
     *
     * @param  name The string to be decapitalized.
     * @return  The decapitalized version of the string.
     */
    private static String decapitalize(String name) {
        if (name == null || name.length() == 0) {
            return name;
        }
        if (name.length() > 1 && Character.isUpperCase(name.charAt(1)) &&
                        Character.isUpperCase(name.charAt(0))){
            return name;
        }
        char chars[] = name.toCharArray();
        chars[0] = Character.toLowerCase(chars[0]);
        return new String(chars);
    }

}