import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
/**
 * return the listener for preferences changes.
 * @return the change listener
 */
private IEclipsePreferences.IPreferenceChangeListener getChangeListener() {
	if (changeListener==null) {
		changeListener = new IEclipsePreferences.IPreferenceChangeListener() {
			@Override
			public void preferenceChange(PreferenceChangeEvent pce) {
				
				if (debug==true) System.out.println("Property '" + pce.getKey() + "' changed from " + pce.getOldValue() + " to "+ pce.getNewValue());
				
				switch(pce.getKey()) {
				case DEF_RUNAS:
					boolean changedExecutionMode = (pce.getOldValue()!=null && pce.getNewValue()!=pce.getOldValue());
					if (changedExecutionMode==true) {
						if (debug==true) System.out.println("Changed Execution Mode: changed from " + pce.getOldValue() + " to "+ pce.getNewValue());
						//TODO if the preference dialog was set to SWT!
					}
				}
			}
		};
	}
	return changeListener;
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
@Override
public void preferenceChange(PreferenceChangeEvent event) {
	if (tracking) {
		String id = event.getSource().toString();
		List<KeyValue> preferenceList = preferenceEntries.get(id);
		if (null == preferenceList) {
			preferenceList = new ArrayList<>();
			preferenceEntries.put(id, preferenceList);
		}
		Optional<KeyValue> first = preferenceList.stream().filter(val -> val.getKey().equals(event.getKey())).findFirst();
		if (first.isPresent()) {
			first.get().setValue(PrefUIUtil.emptyIfNull(event.getNewValue()));
		} else {
			KeyValue toAdd = new KeyValue(id, event.getKey(), PrefUIUtil.emptyIfNull(event.getNewValue()));
			preferenceList.add(toAdd); 
		}
		firePreferencesUpdated(id);
	}
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
private boolean isFormatPreferencesChanged(PreferenceChangeEvent event) {
	return TypeScriptCorePreferenceConstants.EDITOR_OPTIONS_CONVERT_TABS_TO_SPACES.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.EDITOR_OPTIONS_INDENT_SIZE.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.EDITOR_OPTIONS_TAB_SIZE.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.FORMAT_OPTIONS_INSERT_SPACE_AFTER_COMMA_DELIMITER
					.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.FORMAT_OPTIONS_INSERT_SPACE_AFTER_SEMICOLON_IN_FOR_STATEMENTS
					.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.FORMAT_OPTIONS_INSERT_SPACE_BEFORE_AND_AFTER_BINARY_OPERATORS
					.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.FORMAT_OPTIONS_INSERT_SPACE_AFTER_KEYWORDS_IN_CONTROL_FLOW_STATEMENTS
					.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.FORMAT_OPTIONS_INSERT_SPACE_AFTER_FUNCTION_KEYWORD_FOR_ANONYMOUS_FUNCTIONS
					.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.FORMAT_OPTIONS_INSERT_SPACE_AFTER_OPENING_AND_BEFORE_CLOSING_NONEMPTY_PARENTHESIS
					.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.FORMAT_OPTIONS_INSERT_SPACE_AFTER_OPENING_AND_BEFORE_CLOSING_NONEMPTY_BRACKETS
					.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.FORMAT_OPTIONS_PLACE_OPEN_BRACE_ON_NEW_LINE_FOR_FUNCTIONS
					.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.FORMAT_OPTIONS_PLACE_OPEN_BRACE_ON_NEW_LINE_FOR_CONTROL_BLOCKS
					.equals(event.getKey());
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
@Override
public void start(BundleContext context) throws Exception {
  final IEclipsePreferences node = getPreferencesRootNode();
  repoSvc = new WorkflowRepositoryServiceImpl(node.get(REPOSITORY_LOCATION_PREFNAME, REPOSITORY_LOCATION_DEFVALUE));
  preferenceChangeListener = new IPreferenceChangeListener() {
    @Override
    public void preferenceChange(PreferenceChangeEvent event) {
      if(REPOSITORY_LOCATION_PREFNAME.equals(event.getKey()) && (repoSvc != null)) {
        // it seems that when you Restore Defaults for preferences, this gives a new value null i.o. the default value!
        String newValue = (event.getNewValue()!=null)? (String) event.getNewValue() : REPOSITORY_LOCATION_DEFVALUE;
        repoSvc.setRootFolder(new File(newValue));
      }
    }
  };
  node.addPreferenceChangeListener(preferenceChangeListener);
  Hashtable<String, String> svcProps = new Hashtable<>();
  svcProps.put("type", "FILE");
  repoSvcReg = context.registerService(WorkflowRepositoryService.class, repoSvc, svcProps);
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
/**
 * Creates a listener that appropriately adds, updates, or removes
 * connections based on the values in the {@link #preferenceStore}.
 * 
 * @return A new property change listener that can be registered with the
 *         preference store.
 */
private IPreferenceChangeListener createPreferenceListener() {
	return new IPreferenceChangeListener() {
		@Override
		public void preferenceChange(PreferenceChangeEvent event) {
			String name = event.getKey();
			Object oldValue = event.getOldValue();
			Object newValue = event.getNewValue();

			// Add, update, or remove depending on whether the old/new
			// values are null.
			if (oldValue != null) {
				if (newValue != null) {
					updateConnection(name, newValue.toString());
				} else {
					removeConnection(name);
				}
			} else if (newValue != null) {
				addConnection(name, newValue.toString());
			}

			return;
		}
	};
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
/**
 * listenForThemeChanges
 */
private void listenForThemeChanges()
{
	this.fThemeChangeListener = new IPreferenceChangeListener()
	{
		public void preferenceChange(PreferenceChangeEvent event)
		{
			if (event.getKey().equals(IThemeManager.THEME_CHANGED))
			{
				applyTheme();
			}
		}
	};

	EclipseUtil.instanceScope().getNode(ThemePlugin.PLUGIN_ID).addPreferenceChangeListener(this.fThemeChangeListener);
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
/**
 * Respond to preference change events
 */
public void preferenceChange(PreferenceChangeEvent event)
{
	String key = event.getKey();

	if (IPreferenceConstants.COMPLETION_PROPOSAL_ACTIVATION_CHARACTERS.equals(key))
	{
		_completionProposalChars = retrieveCAPreference(IPreferenceConstants.COMPLETION_PROPOSAL_ACTIVATION_CHARACTERS);
	}
	else if (IPreferenceConstants.CONTEXT_INFORMATION_ACTIVATION_CHARACTERS.equals(key))
	{
		_contextInformationChars = retrieveCAPreference(IPreferenceConstants.CONTEXT_INFORMATION_ACTIVATION_CHARACTERS);
	}
	else if (IPreferenceConstants.PROPOSAL_TRIGGER_CHARACTERS.equals(key))
	{
		_proposalTriggerChars = retrieveCAPreference(IPreferenceConstants.PROPOSAL_TRIGGER_CHARACTERS);
	}
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
@Override
public void preferenceChange(PreferenceChangeEvent event)
{
	if( event.getKey().equals(JPFClasspathPlugin.PREF_REGISTRY_NAME) )
	{
		manager.modelChanged(this);
	}
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
@Override
public void preferenceChange(PreferenceChangeEvent event)
{
	if( event.getKey().equals(JPFClasspathPlugin.PREF_PARENT_REGISTRIES) )
	{
		manager.modelChanged(this);
	}
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
private void taggerConfigUpdated(PreferenceChangeEvent e) {
	if(e.getKey().equals(TermSuiteUIPreferences.TAGGERS)) {
		Collection<String> configNames = context.get(TaggerService.class).getTaggerConfigNames();
		EPipeline pipeline = this.pipelineValue.getValue();
		if(!configNames.isEmpty()
				&& pipeline.getTaggerConfigName() == null) {
			pipeline.setTaggerConfigName(configNames.iterator().next());
			
		}
	}
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
@Override
public void preferenceChange(PreferenceChangeEvent event) {
	IThemeManager themeManager = TMUIPlugin.getThemeManager();
	if (ThemeManager.E4_THEME_ID.equals(event.getKey())) {
		preferenceThemeChange((String) event.getNewValue(), themeManager);
	} else if (PreferenceConstants.THEME_ASSOCIATIONS.equals(event.getKey())) {
		preferenceThemeChange(themeManager.getPreferenceE4CSSThemeId(), themeManager);
	}
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
public void preferenceChange(PreferenceChangeEvent event) {
  synchronized (lock) {
    if (currState != State.RECORDING) {
      return;
    }
    changeLog.add(new PreferenceChanged(new Path(event.getNode().absolutePath()), 
        event.getKey(), (String) event.getNewValue()));
  }
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
/**
 * Refreshes all notes when a change in the plugin's preferences is detected.
 * 
 * @param event
 */
@Override
public void preferenceChange(PreferenceChangeEvent event) {
	for (int tabIndex = 0; tabIndex < tabFolder.getItemCount(); ++tabIndex) {
		getNote(tabIndex).setParametersFromPreferences();
	}
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
@Override
public void preferenceChange(PreferenceChangeEvent event) {
  Object newValue = event.getNewValue();
  if (PreferenceConstants.CLOUDSDK_PATH.equals(event.getKey())
      && (newValue == null || newValue instanceof String)) {
    CloudSdkContextFunction.sdkPathChanged((String) newValue);
  }
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
private boolean isTypeScriptRuntimePreferencesChanged(PreferenceChangeEvent event) {
	return TypeScriptCorePreferenceConstants.USE_EMBEDDED_TYPESCRIPT.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.EMBEDDED_TYPESCRIPT_ID.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.INSTALLED_TYPESCRIPT_PATH.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.TSSERVER_TRACE_ON_CONSOLE.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.TSSERVER_EMULATE_PLUGINS.equals(event.getKey());
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
private boolean isTslintPreferencesChanged(PreferenceChangeEvent event) {
	return TypeScriptCorePreferenceConstants.TSLINT_STRATEGY.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.TSLINT_USE_CUSTOM_TSLINTJSON_FILE.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.TSLINT_USE_EMBEDDED_TYPESCRIPT.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.TSLINT_EMBEDDED_TYPESCRIPT_ID.equals(event.getKey())
			|| TypeScriptCorePreferenceConstants.TSLINT_INSTALLED_TYPESCRIPT_PATH.equals(event.getKey());
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
public void preferenceChange(PreferenceChangeEvent event) {
	if (TypeScriptCorePreferenceConstants.USE_SALSA_AS_JS_INFERENCE.equals(event.getKey())) {
		try {
			useSalsa = UseSalsa.valueOf(event.getNewValue().toString());
		} catch (Throwable e) {

		}
	}
}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
/**
 * Initialize the preferences listener.
 */
private void initializePreferencesListener() {
	if (preferencesListener == null) {
		preferencesListener = new IEclipsePreferences.IPreferenceChangeListener() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener#preferenceChange(org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent)
			 */
			public void preferenceChange(PreferenceChangeEvent event) {

				if (silentRunning) {
					return;
				}

				Object oldValue = event.getOldValue();
				Object newValue = event.getNewValue();
				String key = event.getKey();
				if (newValue == null) {
					newValue = getDefault(key, oldValue);
				} else if (oldValue == null) {
					oldValue = getDefault(key, newValue);
				}
				firePropertyChangeEvent(event.getKey(), oldValue, newValue);
			}
		};
		getStorePreferences().addPreferenceChangeListener(
				preferencesListener);
	}

}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
/**
 * Initialize the preferences listener.
 */
private void initializePreferencesListener() {
	if (preferencesListener == null) {
		preferencesListener = new IEclipsePreferences.IPreferenceChangeListener() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener#preferenceChange(org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent)
			 */
			@Override
			public void preferenceChange(PreferenceChangeEvent event) {

				if (silentRunning) {
					return;
				}

				Object oldValue = event.getOldValue();
				Object newValue = event.getNewValue();
				String key = event.getKey();
				if (newValue == null) {
					newValue = getDefault(key, oldValue);
				} else if (oldValue == null) {
					oldValue = getDefault(key, newValue);
				}
				firePropertyChangeEvent(event.getKey(), oldValue, newValue);
			}
		};
		getStorePreferences().addPreferenceChangeListener(
				preferencesListener);
	}

}
 

import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent; //导入依赖的package包/类
@Override
public void preferenceChange(PreferenceChangeEvent event) {
  // changes in the configuration for the views, so redraw the graph.
  if (event.getKey().startsWith(LabelPreferencesIds.LABEL_PREFIX)) {
    setLabelPreferences();
  }
  if (event.getKey().startsWith(ColorPreferencesIds.COLORS_PREFIX)) {
    setColorsPreferences();
  }
  if (event.getKey().startsWith(NodePreferencesIds.NODE_PREFIX)) {
    setNodePreferences();
  }
}