Java Program to Implement RoleList API

This Java program Implements RoleList API.A RoleList represents a list of roles (Role objects). It is used as parameter when creating a relation, and when trying to set several roles in a relation (via ‘setRoles()’ method). It is returned as part of a RoleResult, to provide roles successfully retrieved.

Here is the source code of the Java Program to Implement RoleList API.The Java program is successfully compiled and run on a Linux system. The program output is also shown below.

```
import java.util.Collection;
```
```
import java.util.LinkedList;
```
```
import java.util.List;
```

import javax.management.MalformedObjectNameException;

```
import javax.management.ObjectName;
```
```
import javax.management.relation.Role;
```

import javax.management.relation.RoleList;

```
 
```
```
public class RoleListImpl
```
```
{
```
```
    private RoleList roleList;
```
```
 
```

    /** Constructs an empty RoleList. **/

```
    public RoleListImpl()
```
```
    {
```
```
        roleList = new RoleList();
```
```
    }
```
```
 
```

    /** Constructs an empty RoleList with the initial capacity specified. **/

    public RoleListImpl(int initialCapacity)

```
    {
```

        roleList = new RoleList(initialCapacity);

```
    }
```
```
 
```
```
    /**
```

     * Constructs a RoleList containing the elements of the List specified, in

     * the order in which they are returned by the List's iterator.

```
    **/
```

    public RoleListImpl(List<Role> list)

```
    {
```
```
        roleList = new RoleList(list);
```
```
    }
```
```
 
```

    /** Inserts the specified element at the specified position in this list. **/

    public void add(int index, Object element)

```
    {
```
```
        roleList.add(index, element);
```
```
    }
```
```
 
```

    /** Inserts the role specified as an element at the position specified. **/

    public void add(int index, Role role)

```
    {
```
```
        roleList.add(index, role);
```
```
    }
```
```
 
```

    /** Appends the specified element to the end of this list. **/

```
    public boolean add(Object o)
```
```
    {
```
```
        return roleList.add(o);
```
```
    }
```
```
 
```

    /** Adds the Role specified as the last element of the list. **/

```
    public void add(Role role)
```
```
    {
```
```
        roleList.add(role);
```
```
    }
```
```
 
```
```
    /**
```

     * Appends all of the elements in the specified collection to the end of

     * this list, in the order that they are returned by the specified

```
     * collection's Iterator.
```
```
    **/
```

    public boolean addAll(Collection<?> c)

```
    {
```
```
        return roleList.addAll(c);
```
```
    }
```
```
 
```
```
    /**
```

     * Inserts all of the elements in the specified collection into this list,

     * starting at the specified position.

```
    **/
```

    public boolean addAll(int index, Collection<?> c)

```
    {
```

        return roleList.addAll(index, c);

```
    }
```
```
 
```
```
    /**
```

     * Inserts all of the elements in the RoleList specified into this list,

     * starting at the specified position, in the order in which they are

     * returned by the Iterator of the RoleList specified.

```
    **/
```

    public boolean addAll(int index, RoleList roleList)

```
    {
```

        return this.roleList.addAll(index, roleList);

```
    }
```
```
 
```
```
    /**
```

     * Appends all the elements in the RoleList specified to the end of the

     * list, in the order in which they are returned by the Iterator of the

```
     * RoleList specified.
```
```
    **/
```

    public boolean addAll(RoleList roleList)

```
    {
```

        return roleList.addAll(roleList);

```
    }
```
```
 
```

    /** vReturn a view of this list as a List<Role>. **/

```
    public List<Role> asList()
```
```
    {
```
```
        return roleList.asList();
```
```
    }
```
```
 
```
```
    /**
```

     * Replaces the element at the specified position in this list with the

```
     * specified element.
```
```
    **/
```

    public Object set(int index, Object element)

```
    {
```

        return roleList.set(index, element);

```
    }
```
```
 
```

    /** Sets the element at the position specified to be the role specified. **/

    public void set(int index, Role role)

```
    {
```
```
        roleList.set(index, role);
```
```
    }
```
```
 
```

    public static void main(String... arg) throws MalformedObjectNameException

```
    {
```

        RoleListImpl roleList = new RoleListImpl();

        List<ObjectName> rolelist1 = new LinkedList<ObjectName>();

        rolelist1.add(new ObjectName("domain1","key1","value1"));

        rolelist1.add(new ObjectName("domain2","key2","value2"));

        roleList.add(0, new Role("rolename1", rolelist1));

```
 
```

        List<ObjectName> roleList2 = new LinkedList<ObjectName>();

        roleList2.add(new ObjectName("domain3","key3","value3"));

        roleList2.add(new ObjectName("domain4","key4","value4"));

        roleList.add(1, new Role("rolename2", roleList2));

```
 
```

        List<Role> list = roleList.asList();

```
        int index = 0;
```
```
        while (index < list.size())
```
```
        {
```

            System.out.println(list.get(index++) + "\t");

```
        }
```
```
        System.out.println();
```
```
    }
```
```
}
```

$ javac RoleListImpl.java
$ java RoleListImpl
role name: rolename1; role value: domain1:key1=value1, domain2:key2=value2	
role name: rolename2; role value: domain3:key3=value3, domain4:key4=value4

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