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The RoleInfo.java Java example source code
/*
* Copyright (c) 2000, 2006, 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 javax.management.relation;
import com.sun.jmx.mbeanserver.GetPropertyAction;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamField;
import java.io.Serializable;
import java.security.AccessController;
import javax.management.MBeanServer;
import javax.management.NotCompliantMBeanException;
/**
* A RoleInfo object summarises a role in a relation type.
*
* <p>The serialVersionUID of this class is 2504952983494636987L.
*
* @since 1.5
*/
@SuppressWarnings("serial") // serialVersionUID not constant
public class RoleInfo implements Serializable {
// Serialization compatibility stuff:
// Two serial forms are supported in this class. The selected form depends
// on system property "jmx.serial.form":
// - "1.0" for JMX 1.0
// - any other value for JMX 1.1 and higher
//
// Serial version for old serial form
private static final long oldSerialVersionUID = 7227256952085334351L;
//
// Serial version for new serial form
private static final long newSerialVersionUID = 2504952983494636987L;
//
// Serializable fields in old serial form
private static final ObjectStreamField[] oldSerialPersistentFields =
{
new ObjectStreamField("myName", String.class),
new ObjectStreamField("myIsReadableFlg", boolean.class),
new ObjectStreamField("myIsWritableFlg", boolean.class),
new ObjectStreamField("myDescription", String.class),
new ObjectStreamField("myMinDegree", int.class),
new ObjectStreamField("myMaxDegree", int.class),
new ObjectStreamField("myRefMBeanClassName", String.class)
};
//
// Serializable fields in new serial form
private static final ObjectStreamField[] newSerialPersistentFields =
{
new ObjectStreamField("name", String.class),
new ObjectStreamField("isReadable", boolean.class),
new ObjectStreamField("isWritable", boolean.class),
new ObjectStreamField("description", String.class),
new ObjectStreamField("minDegree", int.class),
new ObjectStreamField("maxDegree", int.class),
new ObjectStreamField("referencedMBeanClassName", String.class)
};
//
// Actual serial version and serial form
private static final long serialVersionUID;
/**
* @serialField name String Role name
* @serialField isReadable boolean Read access mode: <code>true if role is readable
* @serialField isWritable boolean Write access mode: <code>true if role is writable
* @serialField description String Role description
* @serialField minDegree int Minimum degree (i.e. minimum number of referenced MBeans in corresponding role)
* @serialField maxDegree int Maximum degree (i.e. maximum number of referenced MBeans in corresponding role)
* @serialField referencedMBeanClassName String Name of class of MBean(s) expected to be referenced in corresponding role
*/
private static final ObjectStreamField[] serialPersistentFields;
private static boolean compat = false;
static {
try {
GetPropertyAction act = new GetPropertyAction("jmx.serial.form");
String form = AccessController.doPrivileged(act);
compat = (form != null && form.equals("1.0"));
} catch (Exception e) {
// OK : Too bad, no compat with 1.0
}
if (compat) {
serialPersistentFields = oldSerialPersistentFields;
serialVersionUID = oldSerialVersionUID;
} else {
serialPersistentFields = newSerialPersistentFields;
serialVersionUID = newSerialVersionUID;
}
}
//
// END Serialization compatibility stuff
//
// Public constants
//
/**
* To specify an unlimited cardinality.
*/
public static final int ROLE_CARDINALITY_INFINITY = -1;
//
// Private members
//
/**
* @serial Role name
*/
private String name = null;
/**
* @serial Read access mode: <code>true if role is readable
*/
private boolean isReadable;
/**
* @serial Write access mode: <code>true if role is writable
*/
private boolean isWritable;
/**
* @serial Role description
*/
private String description = null;
/**
* @serial Minimum degree (i.e. minimum number of referenced MBeans in corresponding role)
*/
private int minDegree;
/**
* @serial Maximum degree (i.e. maximum number of referenced MBeans in corresponding role)
*/
private int maxDegree;
/**
* @serial Name of class of MBean(s) expected to be referenced in corresponding role
*/
private String referencedMBeanClassName = null;
//
// Constructors
//
/**
* Constructor.
*
* @param roleName name of the role.
* @param mbeanClassName name of the class of MBean(s) expected to
* be referenced in corresponding role. If an MBean <em>M is in
* this role, then the MBean server must return true for
* {@link MBeanServer#isInstanceOf isInstanceOf(M, mbeanClassName)}.
* @param read flag to indicate if the corresponding role
* can be read
* @param write flag to indicate if the corresponding role
* can be set
* @param min minimum degree for role, i.e. minimum number of
* MBeans to provide in corresponding role
* Must be less than or equal to <tt>max.
* (ROLE_CARDINALITY_INFINITY for unlimited)
* @param max maximum degree for role, i.e. maximum number of
* MBeans to provide in corresponding role
* Must be greater than or equal to <tt>min
* (ROLE_CARDINALITY_INFINITY for unlimited)
* @param descr description of the role (can be null)
*
* @exception IllegalArgumentException if null parameter
* @exception InvalidRoleInfoException if the minimum degree is
* greater than the maximum degree.
* @exception ClassNotFoundException As of JMX 1.2, this exception
* can no longer be thrown. It is retained in the declaration of
* this class for compatibility with existing code.
* @exception NotCompliantMBeanException if the class mbeanClassName
* is not a MBean class.
*/
public RoleInfo(String roleName,
String mbeanClassName,
boolean read,
boolean write,
int min,
int max,
String descr)
throws IllegalArgumentException,
InvalidRoleInfoException,
ClassNotFoundException,
NotCompliantMBeanException {
init(roleName,
mbeanClassName,
read,
write,
min,
max,
descr);
return;
}
/**
* Constructor.
*
* @param roleName name of the role
* @param mbeanClassName name of the class of MBean(s) expected to
* be referenced in corresponding role. If an MBean <em>M is in
* this role, then the MBean server must return true for
* {@link MBeanServer#isInstanceOf isInstanceOf(M, mbeanClassName)}.
* @param read flag to indicate if the corresponding role
* can be read
* @param write flag to indicate if the corresponding role
* can be set
*
* <P>Minimum and maximum degrees defaulted to 1.
* <P>Description of role defaulted to null.
*
* @exception IllegalArgumentException if null parameter
* @exception ClassNotFoundException As of JMX 1.2, this exception
* can no longer be thrown. It is retained in the declaration of
* this class for compatibility with existing code.
* @exception NotCompliantMBeanException As of JMX 1.2, this
* exception can no longer be thrown. It is retained in the
* declaration of this class for compatibility with existing code.
*/
public RoleInfo(String roleName,
String mbeanClassName,
boolean read,
boolean write)
throws IllegalArgumentException,
ClassNotFoundException,
NotCompliantMBeanException {
try {
init(roleName,
mbeanClassName,
read,
write,
1,
1,
null);
} catch (InvalidRoleInfoException exc) {
// OK : Can never happen as the minimum
// degree equals the maximum degree.
}
return;
}
/**
* Constructor.
*
* @param roleName name of the role
* @param mbeanClassName name of the class of MBean(s) expected to
* be referenced in corresponding role. If an MBean <em>M is in
* this role, then the MBean server must return true for
* {@link MBeanServer#isInstanceOf isInstanceOf(M, mbeanClassName)}.
*
* <P>IsReadable and IsWritable defaulted to true.
* <P>Minimum and maximum degrees defaulted to 1.
* <P>Description of role defaulted to null.
*
* @exception IllegalArgumentException if null parameter
* @exception ClassNotFoundException As of JMX 1.2, this exception
* can no longer be thrown. It is retained in the declaration of
* this class for compatibility with existing code.
* @exception NotCompliantMBeanException As of JMX 1.2, this
* exception can no longer be thrown. It is retained in the
* declaration of this class for compatibility with existing code.
*/
public RoleInfo(String roleName,
String mbeanClassName)
throws IllegalArgumentException,
ClassNotFoundException,
NotCompliantMBeanException {
try {
init(roleName,
mbeanClassName,
true,
true,
1,
1,
null);
} catch (InvalidRoleInfoException exc) {
// OK : Can never happen as the minimum
// degree equals the maximum degree.
}
return;
}
/**
* Copy constructor.
*
* @param roleInfo the <tt>RoleInfo instance to be copied.
*
* @exception IllegalArgumentException if null parameter
*/
public RoleInfo(RoleInfo roleInfo)
throws IllegalArgumentException {
if (roleInfo == null) {
// Revisit [cebro] Localize message
String excMsg = "Invalid parameter.";
throw new IllegalArgumentException(excMsg);
}
try {
init(roleInfo.getName(),
roleInfo.getRefMBeanClassName(),
roleInfo.isReadable(),
roleInfo.isWritable(),
roleInfo.getMinDegree(),
roleInfo.getMaxDegree(),
roleInfo.getDescription());
} catch (InvalidRoleInfoException exc3) {
// OK : Can never happen as the minimum degree and the maximum
// degree were already checked at the time the roleInfo
// instance was created.
}
}
//
// Accessors
//
/**
* Returns the name of the role.
*
* @return the name of the role.
*/
public String getName() {
return name;
}
/**
* Returns read access mode for the role (true if it is readable).
*
* @return true if the role is readable.
*/
public boolean isReadable() {
return isReadable;
}
/**
* Returns write access mode for the role (true if it is writable).
*
* @return true if the role is writable.
*/
public boolean isWritable() {
return isWritable;
}
/**
* Returns description text for the role.
*
* @return the description of the role.
*/
public String getDescription() {
return description;
}
/**
* Returns minimum degree for corresponding role reference.
*
* @return the minimum degree.
*/
public int getMinDegree() {
return minDegree;
}
/**
* Returns maximum degree for corresponding role reference.
*
* @return the maximum degree.
*/
public int getMaxDegree() {
return maxDegree;
}
/**
* <p>Returns name of type of MBean expected to be referenced in
* corresponding role.</p>
*
* @return the name of the referenced type.
*/
public String getRefMBeanClassName() {
return referencedMBeanClassName;
}
/**
* Returns true if the <tt>value parameter is greater than or equal to
* the expected minimum degree, false otherwise.
*
* @param value the value to be checked
*
* @return true if greater than or equal to minimum degree, false otherwise.
*/
public boolean checkMinDegree(int value) {
if (value >= ROLE_CARDINALITY_INFINITY &&
(minDegree == ROLE_CARDINALITY_INFINITY
|| value >= minDegree)) {
return true;
} else {
return false;
}
}
/**
* Returns true if the <tt>value parameter is lower than or equal to
* the expected maximum degree, false otherwise.
*
* @param value the value to be checked
*
* @return true if lower than or equal to maximum degree, false otherwise.
*/
public boolean checkMaxDegree(int value) {
if (value >= ROLE_CARDINALITY_INFINITY &&
(maxDegree == ROLE_CARDINALITY_INFINITY ||
(value != ROLE_CARDINALITY_INFINITY &&
value <= maxDegree))) {
return true;
} else {
return false;
}
}
/**
* Returns a string describing the role info.
*
* @return a description of the role info.
*/
public String toString() {
StringBuilder result = new StringBuilder();
result.append("role info name: " + name);
result.append("; isReadable: " + isReadable);
result.append("; isWritable: " + isWritable);
result.append("; description: " + description);
result.append("; minimum degree: " + minDegree);
result.append("; maximum degree: " + maxDegree);
result.append("; MBean class: " + referencedMBeanClassName);
return result.toString();
}
//
// Misc
//
// Initialization
private void init(String roleName,
String mbeanClassName,
boolean read,
boolean write,
int min,
int max,
String descr)
throws IllegalArgumentException,
InvalidRoleInfoException {
if (roleName == null ||
mbeanClassName == null) {
// Revisit [cebro] Localize message
String excMsg = "Invalid parameter.";
throw new IllegalArgumentException(excMsg);
}
name = roleName;
isReadable = read;
isWritable = write;
if (descr != null) {
description = descr;
}
boolean invalidRoleInfoFlg = false;
StringBuilder excMsgStrB = new StringBuilder();
if (max != ROLE_CARDINALITY_INFINITY &&
(min == ROLE_CARDINALITY_INFINITY ||
min > max)) {
// Revisit [cebro] Localize message
excMsgStrB.append("Minimum degree ");
excMsgStrB.append(min);
excMsgStrB.append(" is greater than maximum degree ");
excMsgStrB.append(max);
invalidRoleInfoFlg = true;
} else if (min < ROLE_CARDINALITY_INFINITY ||
max < ROLE_CARDINALITY_INFINITY) {
// Revisit [cebro] Localize message
excMsgStrB.append("Minimum or maximum degree has an illegal value, must be [0, ROLE_CARDINALITY_INFINITY].");
invalidRoleInfoFlg = true;
}
if (invalidRoleInfoFlg) {
throw new InvalidRoleInfoException(excMsgStrB.toString());
}
minDegree = min;
maxDegree = max;
referencedMBeanClassName = mbeanClassName;
return;
}
/**
* Deserializes a {@link RoleInfo} from an {@link ObjectInputStream}.
*/
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException {
if (compat)
{
// Read an object serialized in the old serial form
//
ObjectInputStream.GetField fields = in.readFields();
name = (String) fields.get("myName", null);
if (fields.defaulted("myName"))
{
throw new NullPointerException("myName");
}
isReadable = fields.get("myIsReadableFlg", false);
if (fields.defaulted("myIsReadableFlg"))
{
throw new NullPointerException("myIsReadableFlg");
}
isWritable = fields.get("myIsWritableFlg", false);
if (fields.defaulted("myIsWritableFlg"))
{
throw new NullPointerException("myIsWritableFlg");
}
description = (String) fields.get("myDescription", null);
if (fields.defaulted("myDescription"))
{
throw new NullPointerException("myDescription");
}
minDegree = fields.get("myMinDegree", 0);
if (fields.defaulted("myMinDegree"))
{
throw new NullPointerException("myMinDegree");
}
maxDegree = fields.get("myMaxDegree", 0);
if (fields.defaulted("myMaxDegree"))
{
throw new NullPointerException("myMaxDegree");
}
referencedMBeanClassName = (String) fields.get("myRefMBeanClassName", null);
if (fields.defaulted("myRefMBeanClassName"))
{
throw new NullPointerException("myRefMBeanClassName");
}
}
else
{
// Read an object serialized in the new serial form
//
in.defaultReadObject();
}
}
/**
* Serializes a {@link RoleInfo} to an {@link ObjectOutputStream}.
*/
private void writeObject(ObjectOutputStream out)
throws IOException {
if (compat)
{
// Serializes this instance in the old serial form
//
ObjectOutputStream.PutField fields = out.putFields();
fields.put("myName", name);
fields.put("myIsReadableFlg", isReadable);
fields.put("myIsWritableFlg", isWritable);
fields.put("myDescription", description);
fields.put("myMinDegree", minDegree);
fields.put("myMaxDegree", maxDegree);
fields.put("myRefMBeanClassName", referencedMBeanClassName);
out.writeFields();
}
else
{
// Serializes this instance in the new serial form
//
out.defaultWriteObject();
}
}
}
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