JDK8/Java8源码在线阅读
/*
* Copyright (c) 2000, 2013, 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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* questions.
*/
package javax.management.openmbean;
// java import
//
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.management.Descriptor;
import javax.management.DescriptorRead;
import javax.management.ImmutableDescriptor;
import javax.management.MBeanAttributeInfo;
import com.sun.jmx.remote.util.EnvHelp;
import sun.reflect.misc.ConstructorUtil;
import sun.reflect.misc.MethodUtil;
import sun.reflect.misc.ReflectUtil;
/**
* Describes an attribute of an open MBean.
*
*
* @since 1.5
*/
public class OpenMBeanAttributeInfoSupport
extends MBeanAttributeInfo
implements OpenMBeanAttributeInfo {
/* Serial version */
static final long serialVersionUID = -4867215622149721849L;
/**
* @serial The open mbean attribute's <i>open type</i>
*/
private OpenType<?> openType;
/**
* @serial The open mbean attribute's default value
*/
private final Object defaultValue;
/**
* @serial The open mbean attribute's legal values. This {@link
* Set} is unmodifiable
*/
private final Set<?> legalValues; // to be constructed unmodifiable
/**
* @serial The open mbean attribute's min value
*/
private final Comparable<?> minValue;
/**
* @serial The open mbean attribute's max value
*/
private final Comparable<?> maxValue;
// As this instance is immutable, these two values need only
// be calculated once.
private transient Integer myHashCode = null;
private transient String myToString = null;
/**
* Constructs an {@code OpenMBeanAttributeInfoSupport} instance,
* which describes the attribute of an open MBean with the
* specified {@code name}, {@code openType} and {@code
* description}, and the specified read/write access properties.
*
* @param name cannot be a null or empty string.
*
* @param description cannot be a null or empty string.
*
* @param openType cannot be null.
*
* @param isReadable {@code true} if the attribute has a getter
* exposed for management.
*
* @param isWritable {@code true} if the attribute has a setter
* exposed for management.
*
* @param isIs {@code true} if the attribute's getter is of the
* form <tt>is<i>XXX</i></tt>.
*
* @throws IllegalArgumentException if {@code name} or {@code
* description} are null or empty string, or {@code openType} is
* null.
*/
public OpenMBeanAttributeInfoSupport(String name,
String description,
OpenType<?> openType,
boolean isReadable,
boolean isWritable,
boolean isIs) {
this(name, description, openType, isReadable, isWritable, isIs,
(Descriptor) null);
}
/**
* <p>Constructs an {@code OpenMBeanAttributeInfoSupport} instance,
* which describes the attribute of an open MBean with the
* specified {@code name}, {@code openType}, {@code
* description}, read/write access properties, and {@code Descriptor}.</p>
*
* <p>The {@code descriptor} can contain entries that will define
* the values returned by certain methods of this class, as
* explained in the <a href="package-summary.html#constraints">
* package description</a>.
*
* @param name cannot be a null or empty string.
*
* @param description cannot be a null or empty string.
*
* @param openType cannot be null.
*
* @param isReadable {@code true} if the attribute has a getter
* exposed for management.
*
* @param isWritable {@code true} if the attribute has a setter
* exposed for management.
*
* @param isIs {@code true} if the attribute's getter is of the
* form <tt>is<i>XXX</i></tt>.
*
* @param descriptor The descriptor for the attribute. This may be null
* which is equivalent to an empty descriptor.
*
* @throws IllegalArgumentException if {@code name} or {@code
* description} are null or empty string, or {@code openType} is
* null, or the descriptor entries are invalid as described in the
* <a href="package-summary.html#constraints">package description</a>.
*
* @since 1.6
*/
public OpenMBeanAttributeInfoSupport(String name,
String description,
OpenType<?> openType,
boolean isReadable,
boolean isWritable,
boolean isIs,
Descriptor descriptor) {
// Construct parent's state
//
super(name,
(openType==null) ? null : openType.getClassName(),
description,
isReadable,
isWritable,
isIs,
ImmutableDescriptor.union(descriptor, (openType==null)?null:
openType.getDescriptor()));
// Initialize this instance's specific state
//
this.openType = openType;
descriptor = getDescriptor(); // replace null by empty
this.defaultValue = valueFrom(descriptor, "defaultValue", openType);
this.legalValues = valuesFrom(descriptor, "legalValues", openType);
this.minValue = comparableValueFrom(descriptor, "minValue", openType);
this.maxValue = comparableValueFrom(descriptor, "maxValue", openType);
try {
check(this);
} catch (OpenDataException e) {
throw new IllegalArgumentException(e.getMessage(), e);
}
}
/**
* Constructs an {@code OpenMBeanAttributeInfoSupport} instance,
* which describes the attribute of an open MBean with the
* specified {@code name}, {@code openType}, {@code description}
* and {@code defaultValue}, and the specified read/write access
* properties.
*
* @param name cannot be a null or empty string.
*
* @param description cannot be a null or empty string.
*
* @param openType cannot be null.
*
* @param isReadable {@code true} if the attribute has a getter
* exposed for management.
*
* @param isWritable {@code true} if the attribute has a setter
* exposed for management.
*
* @param isIs {@code true} if the attribute's getter is of the
* form <tt>is<i>XXX</i></tt>.
*
* @param defaultValue must be a valid value for the {@code
* openType} specified for this attribute; default value not
* supported for {@code ArrayType} and {@code TabularType}; can
* be null, in which case it means that no default value is set.
*
* @param <T> allows the compiler to check that the {@code defaultValue},
* if non-null, has the correct Java type for the given {@code openType}.
*
* @throws IllegalArgumentException if {@code name} or {@code
* description} are null or empty string, or {@code openType} is
* null.
*
* @throws OpenDataException if {@code defaultValue} is not a
* valid value for the specified {@code openType}, or {@code
* defaultValue} is non null and {@code openType} is an {@code
* ArrayType} or a {@code TabularType}.
*/
public <T> OpenMBeanAttributeInfoSupport(String name,
String description,
OpenType<T> openType,
boolean isReadable,
boolean isWritable,
boolean isIs,
T defaultValue)
throws OpenDataException {
this(name, description, openType, isReadable, isWritable, isIs,
defaultValue, (T[]) null);
}
/**
* <p>Constructs an {@code OpenMBeanAttributeInfoSupport} instance,
* which describes the attribute of an open MBean with the
* specified {@code name}, {@code openType}, {@code description},
* {@code defaultValue} and {@code legalValues}, and the specified
* read/write access properties.</p>
*
* <p>The contents of {@code legalValues} are copied, so subsequent
* modifications of the array referenced by {@code legalValues}
* have no impact on this {@code OpenMBeanAttributeInfoSupport}
* instance.</p>
*
* @param name cannot be a null or empty string.
*
* @param description cannot be a null or empty string.
*
* @param openType cannot be null.
*
* @param isReadable {@code true} if the attribute has a getter
* exposed for management.
*
* @param isWritable {@code true} if the attribute has a setter
* exposed for management.
*
* @param isIs {@code true} if the attribute's getter is of the
* form <tt>is<i>XXX</i></tt>.
*
* @param defaultValue must be a valid value
* for the {@code
* openType} specified for this attribute; default value not
* supported for {@code ArrayType} and {@code TabularType}; can
* be null, in which case it means that no default value is set.
*
* @param legalValues each contained value must be valid for the
* {@code openType} specified for this attribute; legal values
* not supported for {@code ArrayType} and {@code TabularType};
* can be null or empty.
*
* @param <T> allows the compiler to check that the {@code
* defaultValue} and {@code legalValues}, if non-null, have the
* correct Java type for the given {@code openType}.
*
* @throws IllegalArgumentException if {@code name} or {@code
* description} are null or empty string, or {@code openType} is
* null.
*
* @throws OpenDataException if {@code defaultValue} is not a
* valid value for the specified {@code openType}, or one value in
* {@code legalValues} is not valid for the specified {@code
* openType}, or {@code defaultValue} is non null and {@code
* openType} is an {@code ArrayType} or a {@code TabularType}, or
* {@code legalValues} is non null and non empty and {@code
* openType} is an {@code ArrayType} or a {@code TabularType}, or
* {@code legalValues} is non null and non empty and {@code
* defaultValue} is not contained in {@code legalValues}.
*/
public <T> OpenMBeanAttributeInfoSupport(String name,
String description,
OpenType<T> openType,
boolean isReadable,
boolean isWritable,
boolean isIs,
T defaultValue,
T[] legalValues)
throws OpenDataException {
this(name, description, openType, isReadable, isWritable, isIs,
defaultValue, legalValues, null, null);
}
/**
* Constructs an {@code OpenMBeanAttributeInfoSupport} instance,
* which describes the attribute of an open MBean, with the
* specified {@code name}, {@code openType}, {@code description},
* {@code defaultValue}, {@code minValue} and {@code maxValue}.
*
* It is possible to specify minimal and maximal values only for
* an open type whose values are {@code Comparable}.
*
* @param name cannot be a null or empty string.
*
* @param description cannot be a null or empty string.
*
* @param openType cannot be null.
*
* @param isReadable {@code true} if the attribute has a getter
* exposed for management.
*
* @param isWritable {@code true} if the attribute has a setter
* exposed for management.
*
* @param isIs {@code true} if the attribute's getter is of the
* form <tt>is<i>XXX</i></tt>.
*
* @param defaultValue must be a valid value for the {@code
* openType} specified for this attribute; default value not
* supported for {@code ArrayType} and {@code TabularType}; can be
* null, in which case it means that no default value is set.
*
* @param minValue must be valid for the {@code openType}
* specified for this attribute; can be null, in which case it
* means that no minimal value is set.
*
* @param maxValue must be valid for the {@code openType}
* specified for this attribute; can be null, in which case it
* means that no maximal value is set.
*
* @param <T> allows the compiler to check that the {@code
* defaultValue}, {@code minValue}, and {@code maxValue}, if
* non-null, have the correct Java type for the given {@code
* openType}.
*
* @throws IllegalArgumentException if {@code name} or {@code
* description} are null or empty string, or {@code openType} is
* null.
*
* @throws OpenDataException if {@code defaultValue}, {@code
* minValue} or {@code maxValue} is not a valid value for the
* specified {@code openType}, or {@code defaultValue} is non null
* and {@code openType} is an {@code ArrayType} or a {@code
* TabularType}, or both {@code minValue} and {@code maxValue} are
* non-null and {@code minValue.compareTo(maxValue) > 0} is {@code
* true}, or both {@code defaultValue} and {@code minValue} are
* non-null and {@code minValue.compareTo(defaultValue) > 0} is
* {@code true}, or both {@code defaultValue} and {@code maxValue}
* are non-null and {@code defaultValue.compareTo(maxValue) > 0}
* is {@code true}.
*/
public <T> OpenMBeanAttributeInfoSupport(String name,
String description,
OpenType<T> openType,
boolean isReadable,
boolean isWritable,
boolean isIs,
T defaultValue,
Comparable<T> minValue,
Comparable<T> maxValue)
throws OpenDataException {
this(name, description, openType, isReadable, isWritable, isIs,
defaultValue, null, minValue, maxValue);
}
private <T> OpenMBeanAttributeInfoSupport(String name,
String description,
OpenType<T> openType,
boolean isReadable,
boolean isWritable,
boolean isIs,
T defaultValue,
T[] legalValues,
Comparable<T> minValue,
Comparable<T> maxValue)
throws OpenDataException {
super(name,
(openType==null) ? null : openType.getClassName(),
description,
isReadable,
isWritable,
isIs,
makeDescriptor(openType,
defaultValue, legalValues, minValue, maxValue));
this.openType = openType;
Descriptor d = getDescriptor();
this.defaultValue = defaultValue;
this.minValue = minValue;
this.maxValue = maxValue;
// We already converted the array into an unmodifiable Set
// in the descriptor.
this.legalValues = (Set<?>) d.getFieldValue("legalValues");
check(this);
}
/**
* An object serialized in a version of the API before Descriptors were
* added to this class will have an empty or null Descriptor.
* For consistency with our
* behavior in this version, we must replace the object with one
* where the Descriptors reflect the same values of openType, defaultValue,
* etc.
**/
private Object readResolve() {
if (getDescriptor().getFieldNames().length == 0) {
OpenType<Object> xopenType = cast(openType);
Set<Object> xlegalValues = cast(legalValues);
Comparable<Object> xminValue = cast(minValue);
Comparable<Object> xmaxValue = cast(maxValue);
return new OpenMBeanAttributeInfoSupport(
name, description, openType,
isReadable(), isWritable(), isIs(),
makeDescriptor(xopenType, defaultValue, xlegalValues,
xminValue, xmaxValue));
} else
return this;
}
static void check(OpenMBeanParameterInfo info) throws OpenDataException {
OpenType<?> openType = info.getOpenType();
if (openType == null)
throw new IllegalArgumentException("OpenType cannot be null");
if (info.getName() == null ||
info.getName().trim().equals(""))
throw new IllegalArgumentException("Name cannot be null or empty");
if (info.getDescription() == null ||
info.getDescription().trim().equals(""))
throw new IllegalArgumentException("Description cannot be null or empty");
// Check and initialize defaultValue
//
if (info.hasDefaultValue()) {
// Default value not supported for ArrayType and TabularType
// Cast to Object because "OpenType<T> instanceof" is illegal
if (openType.isArray() || (Object)openType instanceof TabularType) {
throw new OpenDataException("Default value not supported " +
"for ArrayType and TabularType");
}
// Check defaultValue's class
if (!openType.isValue(info.getDefaultValue())) {
final String msg =
"Argument defaultValue's class [\"" +
info.getDefaultValue().getClass().getName() +
"\"] does not match the one defined in openType[\"" +
openType.getClassName() +"\"]";
throw new OpenDataException(msg);
}
}
// Check that we don't have both legalValues and min or max
//
if (info.hasLegalValues() &&
(info.hasMinValue() || info.hasMaxValue())) {
throw new OpenDataException("cannot have both legalValue and " +
"minValue or maxValue");
}
// Check minValue and maxValue
if (info.hasMinValue() && !openType.isValue(info.getMinValue())) {
final String msg =
"Type of minValue [" + info.getMinValue().getClass().getName() +
"] does not match OpenType [" + openType.getClassName() + "]";
throw new OpenDataException(msg);
}
if (info.hasMaxValue() && !openType.isValue(info.getMaxValue())) {
final String msg =
"Type of maxValue [" + info.getMaxValue().getClass().getName() +
"] does not match OpenType [" + openType.getClassName() + "]";
throw new OpenDataException(msg);
}
// Check that defaultValue is a legal value
//
if (info.hasDefaultValue()) {
Object defaultValue = info.getDefaultValue();
if (info.hasLegalValues() &&
!info.getLegalValues().contains(defaultValue)) {
throw new OpenDataException("defaultValue is not contained " +
"in legalValues");
}
// Check that minValue <= defaultValue <= maxValue
//
if (info.hasMinValue()) {
if (compare(info.getMinValue(), defaultValue) > 0) {
throw new OpenDataException("minValue cannot be greater " +
"than defaultValue");
}
}
if (info.hasMaxValue()) {
if (compare(info.getMaxValue(), defaultValue) < 0) {
throw new OpenDataException("maxValue cannot be less " +
"than defaultValue");
}
}
}
// Check legalValues
//
if (info.hasLegalValues()) {
// legalValues not supported for TabularType and arrays
if ((Object)openType instanceof TabularType || openType.isArray()) {
throw new OpenDataException("Legal values not supported " +
"for TabularType and arrays");
}
// Check legalValues are valid with openType
for (Object v : info.getLegalValues()) {
if (!openType.isValue(v)) {
final String msg =
"Element of legalValues [" + v +
"] is not a valid value for the specified openType [" +
openType.toString() +"]";
throw new OpenDataException(msg);
}
}
}
// Check that, if both specified, minValue <= maxValue
//
if (info.hasMinValue() && info.hasMaxValue()) {
if (compare(info.getMinValue(), info.getMaxValue()) > 0) {
throw new OpenDataException("minValue cannot be greater " +
"than maxValue");
}
}
}
@SuppressWarnings({"unchecked", "rawtypes"})
static int compare(Object x, Object y) {
return ((Comparable) x).compareTo(y);
}
static <T> Descriptor makeDescriptor(OpenType<T> openType,
T defaultValue,
T[] legalValues,
Comparable<T> minValue,
Comparable<T> maxValue) {
Map<String, Object> map = new HashMap<String, Object>();
if (defaultValue != null)
map.put("defaultValue", defaultValue);
if (legalValues != null) {
Set<T> set = new HashSet<T>();
for (T v : legalValues)
set.add(v);
set = Collections.unmodifiableSet(set);
map.put("legalValues", set);
}
if (minValue != null)
map.put("minValue", minValue);
if (maxValue != null)
map.put("maxValue", maxValue);
if (map.isEmpty()) {
return openType.getDescriptor();
} else {
map.put("openType", openType);
return new ImmutableDescriptor(map);
}
}
static <T> Descriptor makeDescriptor(OpenType<T> openType,
T defaultValue,
Set<T> legalValues,
Comparable<T> minValue,
Comparable<T> maxValue) {
T[] legals;
if (legalValues == null)
legals = null;
else {
legals = cast(new Object[legalValues.size()]);
legalValues.toArray(legals);
}
return makeDescriptor(openType, defaultValue, legals, minValue, maxValue);
}
static <T> T valueFrom(Descriptor d, String name, OpenType<T> openType) {
Object x = d.getFieldValue(name);
if (x == null)
return null;
try {
return convertFrom(x, openType);
} catch (Exception e) {
final String msg =
"Cannot convert descriptor field " + name + " to " +
openType.getTypeName();
throw EnvHelp.initCause(new IllegalArgumentException(msg), e);
}
}
static <T> Set<T> valuesFrom(Descriptor d, String name,
OpenType<T> openType) {
Object x = d.getFieldValue(name);
if (x == null)
return null;
Collection<?> coll;
if (x instanceof Set<?>) {
Set<?> set = (Set<?>) x;
boolean asis = true;
for (Object element : set) {
if (!openType.isValue(element)) {
asis = false;
break;
}
}
if (asis)
return cast(set);
coll = set;
} else if (x instanceof Object[]) {
coll = Arrays.asList((Object[]) x);
} else {
final String msg =
"Descriptor value for " + name + " must be a Set or " +
"an array: " + x.getClass().getName();
throw new IllegalArgumentException(msg);
}
Set<T> result = new HashSet<T>();
for (Object element : coll)
result.add(convertFrom(element, openType));
return result;
}
static <T> Comparable<?> comparableValueFrom(Descriptor d, String name,
OpenType<T> openType) {
T t = valueFrom(d, name, openType);
if (t == null || t instanceof Comparable<?>)
return (Comparable<?>) t;
final String msg =
"Descriptor field " + name + " with value " + t +
" is not Comparable";
throw new IllegalArgumentException(msg);
}
private static <T> T convertFrom(Object x, OpenType<T> openType) {
if (openType.isValue(x)) {
T t = OpenMBeanAttributeInfoSupport.<T>cast(x);
return t;
}
return convertFromStrings(x, openType);
}
private static <T> T convertFromStrings(Object x, OpenType<T> openType) {
if (openType instanceof ArrayType<?>)
return convertFromStringArray(x, openType);
else if (x instanceof String)
return convertFromString((String) x, openType);
final String msg =
"Cannot convert value " + x + " of type " +
x.getClass().getName() + " to type " + openType.getTypeName();
throw new IllegalArgumentException(msg);
}
private static <T> T convertFromString(String s, OpenType<T> openType) {
Class<T> c;
try {
ReflectUtil.checkPackageAccess(openType.safeGetClassName());
c = cast(Class.forName(openType.safeGetClassName()));
} catch (ClassNotFoundException e) {
throw new NoClassDefFoundError(e.toString()); // can't happen
}
// Look for: public static T valueOf(String)
Method valueOf;
try {
// It is safe to call this plain Class.getMethod because the class "c"
// was checked before by ReflectUtil.checkPackageAccess(openType.safeGetClassName());
valueOf = c.getMethod("valueOf", String.class);
if (!Modifier.isStatic(valueOf.getModifiers()) ||
valueOf.getReturnType() != c)
valueOf = null;
} catch (NoSuchMethodException e) {
valueOf = null;
}
if (valueOf != null) {
try {
return c.cast(MethodUtil.invoke(valueOf, null, new Object[] {s}));
} catch (Exception e) {
final String msg =
"Could not convert \"" + s + "\" using method: " + valueOf;
throw new IllegalArgumentException(msg, e);
}
}
// Look for: public T(String)
Constructor<T> con;
try {
// It is safe to call this plain Class.getConstructor because the class "c"
// was checked before by ReflectUtil.checkPackageAccess(openType.safeGetClassName());
con = c.getConstructor(String.class);
} catch (NoSuchMethodException e) {
con = null;
}
if (con != null) {
try {
return con.newInstance(s);
} catch (Exception e) {
final String msg =
"Could not convert \"" + s + "\" using constructor: " + con;
throw new IllegalArgumentException(msg, e);
}
}
throw new IllegalArgumentException("Don't know how to convert " +
"string to " +
openType.getTypeName());
}
/* A Descriptor contained an array value encoded as Strings. The
Strings must be organized in an array corresponding to the desired
array. If the desired array has n dimensions, so must the String
array. We will convert element by element from String to desired
component type. */
private static <T> T convertFromStringArray(Object x,
OpenType<T> openType) {
ArrayType<?> arrayType = (ArrayType<?>) openType;
OpenType<?> baseType = arrayType.getElementOpenType();
int dim = arrayType.getDimension();
String squareBrackets = "[";
for (int i = 1; i < dim; i++)
squareBrackets += "[";
Class<?> stringArrayClass;
Class<?> targetArrayClass;
try {
stringArrayClass =
Class.forName(squareBrackets + "Ljava.lang.String;");
targetArrayClass =
Class.forName(squareBrackets + "L" + baseType.safeGetClassName() +
";");
} catch (ClassNotFoundException e) {
throw new NoClassDefFoundError(e.toString()); // can't happen
}
if (!stringArrayClass.isInstance(x)) {
final String msg =
"Value for " + dim + "-dimensional array of " +
baseType.getTypeName() + " must be same type or a String " +
"array with same dimensions";
throw new IllegalArgumentException(msg);
}
OpenType<?> componentOpenType;
if (dim == 1)
componentOpenType = baseType;
else {
try {
componentOpenType = new ArrayType<T>(dim - 1, baseType);
} catch (OpenDataException e) {
throw new IllegalArgumentException(e.getMessage(), e);
// can't happen
}
}
int n = Array.getLength(x);
Object[] targetArray = (Object[])
Array.newInstance(targetArrayClass.getComponentType(), n);
for (int i = 0; i < n; i++) {
Object stringish = Array.get(x, i); // String or String[] etc
Object converted =
convertFromStrings(stringish, componentOpenType);
Array.set(targetArray, i, converted);
}
return OpenMBeanAttributeInfoSupport.<T>cast(targetArray);
}
@SuppressWarnings("unchecked")
static <T> T cast(Object x) {
return (T) x;
}
/**
* Returns the open type for the values of the attribute described
* by this {@code OpenMBeanAttributeInfoSupport} instance.
*/
public OpenType<?> getOpenType() {
return openType;
}
/**
* Returns the default value for the attribute described by this
* {@code OpenMBeanAttributeInfoSupport} instance, if specified,
* or {@code null} otherwise.
*/
public Object getDefaultValue() {
// Special case for ArrayType and TabularType
// [JF] TODO: clone it so that it cannot be altered,
// [JF] TODO: if we decide to support defaultValue as an array itself.
// [JF] As of today (oct 2000) it is not supported so
// defaultValue is null for arrays. Nothing to do.
return defaultValue;
}
/**
* Returns an unmodifiable Set of legal values for the attribute
* described by this {@code OpenMBeanAttributeInfoSupport}
* instance, if specified, or {@code null} otherwise.
*/
public Set<?> getLegalValues() {
// Special case for ArrayType and TabularType
// [JF] TODO: clone values so that they cannot be altered,
// [JF] TODO: if we decide to support LegalValues as an array itself.
// [JF] As of today (oct 2000) it is not supported so
// legalValues is null for arrays. Nothing to do.
// Returns our legalValues Set (set was constructed unmodifiable)
return (legalValues);
}
/**
* Returns the minimal value for the attribute described by this
* {@code OpenMBeanAttributeInfoSupport} instance, if specified,
* or {@code null} otherwise.
*/
public Comparable<?> getMinValue() {
// Note: only comparable values have a minValue,
// so that's not the case of arrays and tabulars (always null).
return minValue;
}
/**
* Returns the maximal value for the attribute described by this
* {@code OpenMBeanAttributeInfoSupport} instance, if specified,
* or {@code null} otherwise.
*/
public Comparable<?> getMaxValue() {
// Note: only comparable values have a maxValue,
// so that's not the case of arrays and tabulars (always null).
return maxValue;
}
/**
* Returns {@code true} if this {@code
* OpenMBeanAttributeInfoSupport} instance specifies a non-null
* default value for the described attribute, {@code false}
* otherwise.
*/
public boolean hasDefaultValue() {
return (defaultValue != null);
}
/**
* Returns {@code true} if this {@code
* OpenMBeanAttributeInfoSupport} instance specifies a non-null
* set of legal values for the described attribute, {@code false}
* otherwise.
*/
public boolean hasLegalValues() {
return (legalValues != null);
}
/**
* Returns {@code true} if this {@code
* OpenMBeanAttributeInfoSupport} instance specifies a non-null
* minimal value for the described attribute, {@code false}
* otherwise.
*/
public boolean hasMinValue() {
return (minValue != null);
}
/**
* Returns {@code true} if this {@code
* OpenMBeanAttributeInfoSupport} instance specifies a non-null
* maximal value for the described attribute, {@code false}
* otherwise.
*/
public boolean hasMaxValue() {
return (maxValue != null);
}
/**
* Tests whether {@code obj} is a valid value for the attribute
* described by this {@code OpenMBeanAttributeInfoSupport}
* instance.
*
* @param obj the object to be tested.
*
* @return {@code true} if {@code obj} is a valid value for
* the parameter described by this {@code
* OpenMBeanAttributeInfoSupport} instance, {@code false}
* otherwise.
*/
public boolean isValue(Object obj) {
return isValue(this, obj);
}
@SuppressWarnings({"unchecked", "rawtypes"}) // cast to Comparable
static boolean isValue(OpenMBeanParameterInfo info, Object obj) {
if (info.hasDefaultValue() && obj == null)
return true;
return
info.getOpenType().isValue(obj) &&
(!info.hasLegalValues() || info.getLegalValues().contains(obj)) &&
(!info.hasMinValue() ||
((Comparable) info.getMinValue()).compareTo(obj) <= 0) &&
(!info.hasMaxValue() ||
((Comparable) info.getMaxValue()).compareTo(obj) >= 0);
}
/* *** Commodity methods from java.lang.Object *** */
/**
* Compares the specified {@code obj} parameter with this {@code
* OpenMBeanAttributeInfoSupport} instance for equality.
* <p>
* Returns {@code true} if and only if all of the following statements are true:
* <ul>
* <li>{@code obj} is non null,</li>
* <li>{@code obj} also implements the {@code OpenMBeanAttributeInfo} interface,</li>
* <li>their names are equal</li>
* <li>their open types are equal</li>
* <li>their access properties (isReadable, isWritable and isIs) are equal</li>
* <li>their default, min, max and legal values are equal.</li>
* </ul>
* This ensures that this {@code equals} method works properly for
* {@code obj} parameters which are different implementations of
* the {@code OpenMBeanAttributeInfo} interface.
*
* <p>If {@code obj} also implements {@link DescriptorRead}, then its
* {@link DescriptorRead#getDescriptor() getDescriptor()} method must
* also return the same value as for this object.</p>
*
* @param obj the object to be compared for equality with this
* {@code OpenMBeanAttributeInfoSupport} instance.
*
* @return {@code true} if the specified object is equal to this
* {@code OpenMBeanAttributeInfoSupport} instance.
*/
public boolean equals(Object obj) {
if (!(obj instanceof OpenMBeanAttributeInfo))
return false;
OpenMBeanAttributeInfo other = (OpenMBeanAttributeInfo) obj;
return
this.isReadable() == other.isReadable() &&
this.isWritable() == other.isWritable() &&
this.isIs() == other.isIs() &&
equal(this, other);
}
static boolean equal(OpenMBeanParameterInfo x1, OpenMBeanParameterInfo x2) {
if (x1 instanceof DescriptorRead) {
if (!(x2 instanceof DescriptorRead))
return false;
Descriptor d1 = ((DescriptorRead) x1).getDescriptor();
Descriptor d2 = ((DescriptorRead) x2).getDescriptor();
if (!d1.equals(d2))
return false;
} else if (x2 instanceof DescriptorRead)
return false;
return
x1.getName().equals(x2.getName()) &&
x1.getOpenType().equals(x2.getOpenType()) &&
(x1.hasDefaultValue() ?
x1.getDefaultValue().equals(x2.getDefaultValue()) :
!x2.hasDefaultValue()) &&
(x1.hasMinValue() ?
x1.getMinValue().equals(x2.getMinValue()) :
!x2.hasMinValue()) &&
(x1.hasMaxValue() ?
x1.getMaxValue().equals(x2.getMaxValue()) :
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