--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.commands/src/org/eclipse/core/commands/NamedHandleObjectWithState.d	Sat Mar 14 18:23:29 2009 +0100
@@ -0,0 +1,132 @@
+/*******************************************************************************
+ * Copyright (c) 2005, 2006 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+
+module org.eclipse.core.commands.NamedHandleObjectWithState;
+
+import org.eclipse.core.commands.common.NamedHandleObject;
+import org.eclipse.core.commands.common.NotDefinedException;
+import org.eclipse.core.commands.IObjectWithState;
+import org.eclipse.core.commands.State;
+import org.eclipse.core.commands.INamedHandleStateIds;
+
+import java.lang.all;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.Set;
+
+/**
+ * <p>
+ * A named handle object that can carry state with it. This state can be used to
+ * override the name or description.
+ * </p>
+ * <p>
+ * Clients may neither instantiate nor extend this class.
+ * </p>
+ *
+ * @since 3.2
+ */
+abstract class NamedHandleObjectWithState : NamedHandleObject,
+        IObjectWithState {
+
+    /**
+     * An empty string array, which can be returned from {@link #getStateIds()}
+     * if there is no state.
+     */
+    private static const String[] NO_STATE = null;
+
+    /**
+     * The map of states currently held by this command. If this command has no
+     * state, then this will be <code>null</code>.
+     */
+    private Map states = null;
+
+    /**
+     * Constructs a new instance of <code>NamedHandleObject<WithState/code>.
+     *
+     * @param id
+     *            The identifier for this handle; must not be <code>null</code>.
+     */
+    protected this(String id) {
+        super(id);
+    }
+
+    public void addState(String stateId, State state) {
+        if (state is null) {
+            throw new NullPointerException("Cannot add a null state"); //$NON-NLS-1$
+        }
+
+        if (states is null) {
+            states = new HashMap(3);
+        }
+        states.put(stateId, state);
+    }
+
+    public override final String getDescription() {
+        String description = super.getDescription(); // Trigger a NDE.
+
+        State descriptionState = getState(INamedHandleStateIds.DESCRIPTION);
+        if (descriptionState !is null) {
+            Object value = descriptionState.getValue();
+            if (value !is null) {
+                return value.toString();
+            }
+        }
+
+        return description;
+    }
+
+    public override final String getName() {
+        String name = super.getName(); // Trigger a NDE, if necessary.
+
+        State nameState = getState(INamedHandleStateIds.NAME);
+        if (nameState !is null) {
+            final Object value = nameState.getValue();
+            if (value !is null) {
+                return value.toString();
+            }
+        }
+
+        return name;
+    }
+
+    public final State getState(String stateId) {
+        if ((states is null) || (states.isEmpty())) {
+            return null;
+        }
+
+        return cast(State) states.get(stateId);
+    }
+
+    public final String[] getStateIds() {
+        if ((states is null) || (states.isEmpty())) {
+            return NO_STATE;
+        }
+
+        Set stateIds = states.keySet();
+        return stringcast( stateIds.toArray());
+    }
+
+    public void removeState(String id) {
+        if (id is null) {
+            throw new NullPointerException("Cannot remove a null id"); //$NON-NLS-1$
+        }
+
+        if (states !is null) {
+            states.remove(id);
+            if (states.isEmpty()) {
+                states = null;
+            }
+        }
+    }
+
+}