Mercurial > projects > dwt2
view org.eclipse.core.commands/src/org/eclipse/core/commands/NamedHandleObjectWithState.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 14 Mar 2009 18:23:29 +0100 |
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/******************************************************************************* * 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; } } } }