Added RoleListModel and refactored implementation to use Java Collections.

git-svn-id: https://svn.libreccm.org/ccm/ccm_ng@4275 8810af33-2d31-482b-a856-94f89814c4df

ccm-cms/src/main/java/com/arsdigita/cms/ui/role/RoleListModel.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2003-2004 Red Hat Inc. All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+package com.arsdigita.cms.ui.role;
+
+import com.arsdigita.bebop.list.ListModel;
+import org.libreccm.security.Role;
+
+import java.util.Collection;
+import java.util.Iterator;
+
+/**
+ * Provides a {@link ListModel} implementation for Collections of Roles.
+ * This class is usable like an iterator, with an exception.
+ * The {@link #next()} method only moves the iterator forward. To get elements you need to first
+ * use {@link #next()} and afterwards {@link #getRole()}, {@link #getElement()} or {@link #getKey()}.
+ *
+ * Also remember that the iterator does not move unless {@link #next()} is called.
+ *
+ * @author <a href="mailto:yannick.buelter@yabue.de">Yannick Bülter</a>
+ */
+class RoleListModel implements ListModel {
+    private final Collection<Role> m_roles;
+
+    private Iterator<Role> iterator;
+
+    private Role currentRole;
+
+    public RoleListModel(final Collection<Role> roles) {
+        m_roles = roles;
+        iterator = roles.iterator();
+    }
+
+    public final boolean next() {
+        currentRole = iterator.next();
+        return currentRole != null;
+    }
+
+    public final Object getElement() {
+        return currentRole.getName();
+    }
+
+    public final String getKey() {
+        return Long.toString(currentRole.getRoleId());
+    }
+
+    public final boolean isEmpty() {
+        return m_roles.isEmpty();
+    }
+
+    public final Role getRole() {
+        return currentRole;
+    }
+
+    public final void reset() {
+        iterator = m_roles.iterator();
+    }
+}