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## javax.management.relation
Class RoleInfo

    java.lang.Object
      javax.management.relation.RoleInfo

All Implemented Interfaces:
  Serializable

    public class RoleInfo

extends Object
implements Serializable

A RoleInfo object summarises a role in a relation type.

The serialVersionUID of this class is `2504952983494636987L`.

Since:
  1.5
See Also:
  Serialized Form

Field Summary
`static int` | `ROLE_CARDINALITY_INFINITY` To specify an unlimited cardinality.

Constructor Summary
`RoleInfo(RoleInfo roleInfo)` Copy constructor.
`RoleInfo(String roleName, String mbeanClassName)` Constructor.
`RoleInfo(String roleName, String mbeanClassName, boolean read, boolean write)` Constructor.
`RoleInfo(String roleName, String mbeanClassName, boolean read, boolean write, int min, int max, String descr)` Constructor.

Method Summary
`boolean` | `checkMaxDegree(int value)` Returns true if the `value` parameter is lower than or equal to the expected maximum degree, false otherwise.
`boolean` | `checkMinDegree(int value)` Returns true if the `value` parameter is greater than or equal to the expected minimum degree, false otherwise.
`String` | `getDescription()` Returns description text for the role.
`int` | `getMaxDegree()` Returns maximum degree for corresponding role reference.
`int` | `getMinDegree()` Returns minimum degree for corresponding role reference.
`String` | `getName()` Returns the name of the role.
`String` | `getRefMBeanClassName()` Returns name of type of MBean expected to be referenced in corresponding role.
`boolean` | `isReadable()` Returns read access mode for the role (true if it is readable).
`boolean` | `isWritable()` Returns write access mode for the role (true if it is writable).
`String` | `toString()` Returns a string describing the role info.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### ROLE_CARDINALITY_INFINITY

    public static final int ROLE_CARDINALITY_INFINITY

  To specify an unlimited cardinality.

  See Also:
    Constant Field Values

Constructor Detail

### RoleInfo

    public RoleInfo(String roleName,
                    String mbeanClassName,
                    boolean read,
                    boolean write,
                    int min,
                    int max,
                    String descr)
             throws IllegalArgumentException,
                    InvalidRoleInfoException,
                    ClassNotFoundException,
                    NotCompliantMBeanException

  Constructor.

  Parameters:
    `roleName` - name of the role.
    `mbeanClassName` - name of the class of MBean(s) expected to be referenced in corresponding role. If an MBean M is in this role, then the MBean server must return true for `isInstanceOf(M, mbeanClassName)`.
    `read` - flag to indicate if the corresponding role can be read
    `write` - flag to indicate if the corresponding role can be set
    `min` - minimum degree for role, i.e. minimum number of MBeans to provide in corresponding role Must be less than or equal to `max`. (ROLE_CARDINALITY_INFINITY for unlimited)
    `max` - maximum degree for role, i.e. maximum number of MBeans to provide in corresponding role Must be greater than or equal to `min` (ROLE_CARDINALITY_INFINITY for unlimited)
    `descr` - description of the role (can be null)
  Throws:
    `IllegalArgumentException` - if null parameter
    `InvalidRoleInfoException` - if the minimum degree is greater than the maximum degree.
    `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.
    `NotCompliantMBeanException` - if the class mbeanClassName is not a MBean class.

### RoleInfo

    public RoleInfo(String roleName,
                    String mbeanClassName,
                    boolean read,
                    boolean write)
             throws IllegalArgumentException,
                    ClassNotFoundException,
                    NotCompliantMBeanException

  Constructor.

  Parameters:
    `roleName` - name of the role
    `mbeanClassName` - name of the class of MBean(s) expected to be referenced in corresponding role. If an MBean M is in this role, then the MBean server must return true for `isInstanceOf(M, mbeanClassName)`.
    `read` - flag to indicate if the corresponding role can be read
    `write` - flag to indicate if the corresponding role can be set

    Minimum and maximum degrees defaulted to 1.

    Description of role defaulted to null.

  Throws:
    `IllegalArgumentException` - if null parameter
    `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.
    `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.

### RoleInfo

    public RoleInfo(String roleName,
                    String mbeanClassName)
             throws IllegalArgumentException,
                    ClassNotFoundException,
                    NotCompliantMBeanException

  Constructor.

  Parameters:
    `roleName` - name of the role
    `mbeanClassName` - name of the class of MBean(s) expected to be referenced in corresponding role. If an MBean M is in this role, then the MBean server must return true for `isInstanceOf(M, mbeanClassName)`.

    IsReadable and IsWritable defaulted to true.

    Minimum and maximum degrees defaulted to 1.

    Description of role defaulted to null.

  Throws:
    `IllegalArgumentException` - if null parameter
    `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.
    `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.

### RoleInfo

    public RoleInfo(RoleInfo roleInfo)
             throws IllegalArgumentException

  Copy constructor.

  Parameters:
    `roleInfo` - the `RoleInfo` instance to be copied.
  Throws:
    `IllegalArgumentException` - if null parameter

Method Detail

### getName

    public String getName()

  Returns the name of the role.

  Returns:
    the name of the role.

### isReadable

    public boolean isReadable()

  Returns read access mode for the role (true if it is readable).

  Returns:
    true if the role is readable.

### isWritable

    public boolean isWritable()

  Returns write access mode for the role (true if it is writable).

  Returns:
    true if the role is writable.

### getDescription

    public String getDescription()

  Returns description text for the role.

  Returns:
    the description of the role.

### getMinDegree

    public int getMinDegree()

  Returns minimum degree for corresponding role reference.

  Returns:
    the minimum degree.

### getMaxDegree

    public int getMaxDegree()

  Returns maximum degree for corresponding role reference.

  Returns:
    the maximum degree.

### getRefMBeanClassName

    public String getRefMBeanClassName()

  Returns name of type of MBean expected to be referenced in corresponding role.

  Returns:
    the name of the referenced type.

### checkMinDegree

    public boolean checkMinDegree(int value)

  Returns true if the `value` parameter is greater than or equal to the expected minimum degree, false otherwise.

  Parameters:
    `value` - the value to be checked
  Returns:
    true if greater than or equal to minimum degree, false otherwise.

### checkMaxDegree

    public boolean checkMaxDegree(int value)

  Returns true if the `value` parameter is lower than or equal to the expected maximum degree, false otherwise.

  Parameters:
    `value` - the value to be checked
  Returns:
    true if lower than or equal to maximum degree, false otherwise.

### toString

    public String toString()

  Returns a string describing the role info.

  Overrides:
    `toString` in class `Object`
  Returns:
    a description of the role info.

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