| /******************************************************************************* |
| * 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 |
| *******************************************************************************/ |
| package org.eclipse.debug.internal.ui.viewers.model.provisional; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.eclipse.core.runtime.ListenerList; |
| import org.eclipse.core.runtime.SafeRunner; |
| import org.eclipse.jface.util.IPropertyChangeListener; |
| import org.eclipse.jface.util.PropertyChangeEvent; |
| import org.eclipse.jface.util.SafeRunnable; |
| |
| /** |
| * Presentation context. |
| * <p> |
| * Clients may instantiate and subclass this class. |
| * </p> |
| * @since 3.2 |
| */ |
| public class PresentationContext implements IPresentationContext { |
| |
| private String fId; |
| private ListenerList fListeners = new ListenerList(); |
| private Map fProperties = new HashMap(); |
| |
| /** |
| * Constructs a presentation context for the given id. |
| * |
| * @param id presentation context id |
| */ |
| public PresentationContext(String id) { |
| fId = id; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext#getColumns() |
| */ |
| public String[] getColumns() { |
| return (String[]) getProperty(IPresentationContext.PROPERTY_COLUMNS); |
| } |
| |
| /** |
| * Fires a property change event to all registered listeners |
| * |
| * @param property property name |
| * @param oldValue old value or <code>null</code> |
| * @param newValue new value or <code>null</code> |
| */ |
| protected void firePropertyChange(String property, Object oldValue, Object newValue) { |
| if (!fListeners.isEmpty()) { |
| final PropertyChangeEvent event = new PropertyChangeEvent(this, property, oldValue, newValue); |
| Object[] listeners = fListeners.getListeners(); |
| for (int i = 0; i < listeners.length; i++) { |
| final IPropertyChangeListener listener = (IPropertyChangeListener) listeners[i]; |
| SafeRunner.run(new SafeRunnable() { |
| public void run() throws Exception { |
| listener.propertyChange(event); |
| } |
| }); |
| } |
| } |
| } |
| |
| /** |
| * Sets the visible column ids. |
| * |
| * @param ids column identifiers |
| */ |
| public void setColumns(String[] ids) { |
| setProperty(IPresentationContext.PROPERTY_COLUMNS, ids); |
| } |
| |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext#dispose() |
| */ |
| public void dispose() { |
| fListeners.clear(); |
| fProperties.clear(); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext#addPropertyChangeListener(org.eclipse.jface.util.IPropertyChangeListener) |
| */ |
| public void addPropertyChangeListener(IPropertyChangeListener listener) { |
| fListeners.add(listener); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext#removePropertyChangeListener(org.eclipse.jface.util.IPropertyChangeListener) |
| */ |
| public void removePropertyChangeListener(IPropertyChangeListener listener) { |
| fListeners.remove(listener); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext#getId() |
| */ |
| public String getId() { |
| return fId; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext#getProperty(java.lang.String) |
| */ |
| public Object getProperty(String property) { |
| synchronized (fProperties) { |
| return fProperties.get(property); |
| } |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext#setProperty(java.lang.String, java.lang.Object) |
| */ |
| public void setProperty(String property, Object value) { |
| synchronized (fProperties) { |
| Object oldValue = fProperties.get(property); |
| if (!isEqual(oldValue, value)) { |
| fProperties.put(property, value); |
| firePropertyChange(property, oldValue, value); |
| } |
| } |
| } |
| |
| private boolean isEqual(Object a, Object b) { |
| if (a == null) { |
| return b == null; |
| } |
| return a.equals(b); |
| } |
| |
| |
| } |