private IFoldingStructureProvider foldingStructureProvider = null;

@Override
protected IFoldingStructureProvider getFoldingStructureProvider() {
	if (foldingStructureProvider == null) {
		foldingStructureProvider = new ExamplePythonFoldingStructureProvider();
	}
	return foldingStructureProvider;
}

public class ExamplePythonFoldingStructureProvider extends AbstractASTFoldingStructureProvider {

	public String getCommentPartition() {
		return IExamplePythonPartitions.PYTHON_COMMENT;
	}

	protected ILog getLog() {
		return ExamplePythonUI.getDefault().getLog();
	}

	protected String getPartition() {
		return IExamplePythonPartitions.PYTHON_PARTITIONING;
	}

	protected IPartitionTokenScanner getPartitionScanner() {
		return ExamplePythonUI.getDefault().getTextTools()
				.getPartitionScanner();
	}

	protected String[] getPartitionTypes() {
		return IExamplePythonPartitions.PYTHON_PARITION_TYPES;
	}

	protected String getNatureId() {
		return ExamplePythonNature.PYTHON_NATURE;
	}
}

public interface ILuaPartitions {
	public static final String LUA_PARTITIONING = LuaConstants.LUA_PARTITIONING;

	public static final String LUA_COMMENT = "__lua_comment"; //$NON-NLS-1$
	public static final String LUA_MULTI_LINE_COMMENT = "__lua_multi_line_comment"; //$NON-NLS-1$
	public static final String LUA_STRING = "__lua_string"; //$NON-NLS-1$
	public static final String LUA_SINGLE_QUOTE_STRING = "__lua_single_quote_string"; //$NON-NLS-1$

	public final static String[] LUA_PARTITION_TYPES = new String[] {
			IDocument.DEFAULT_CONTENT_TYPE, ILuaPartitions.LUA_COMMENT,
			ILuaPartitions.LUA_STRING, ILuaPartitions.LUA_SINGLE_QUOTE_STRING,
			ILuaPartitions.LUA_MULTI_LINE_COMMENT };
}

public class LuaPartitionScanner extends RuleBasedPartitionScanner {

	public LuaPartitionScanner() {
		super();
		List<PatternRule> rules = new ArrayList<PatternRule>();

		/*
		 * Deal with single and double quote multi lines strings
		 */
		IToken string = new Token(ILuaPartitions.LUA_STRING);
		IToken singleQuoteString = new Token(
				ILuaPartitions.LUA_SINGLE_QUOTE_STRING);
		rules
				.add(new MultiLineRule(
						"\'", "\'", singleQuoteString, '\\', false)); //$NON-NLS-1$ //$NON-NLS-2$
		rules.add(new MultiLineRule("\"", "\"", string, '\\', false)); //$NON-NLS-1$ //$NON-NLS-2$

		/*
		 * Deal with comments
		 */

		// Multi-line
		IToken multiLineComment = new Token(
				ILuaPartitions.LUA_MULTI_LINE_COMMENT);
		rules.add(new MultiLineRule("--[[", "]]", multiLineComment));//$NON-NLS-1$

		// Single line
		IToken comment = new Token(ILuaPartitions.LUA_COMMENT);
		rules.add(new EndOfLineRule("--", comment)); //$NON-NLS-1$

		// Apply rules
		IPredicateRule[] result = new IPredicateRule[rules.size()];
		rules.toArray(result);
		setPredicateRules(result);
	}

}

/**
	 * A named preference that controls whether folding is enabled in the Script
	 * editor.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 */
	public static final String EDITOR_FOLDING_ENABLED = "editor_folding_enabled"; //$NON-NLS-1$

<extension point="org.eclipse.core.runtime.preferences">
   <initializer class="MyPreferenceInitializer"/>
</extension>

public class MyPreferenceInitializer extends AbstractPreferenceInitializer {

	@Override
	public void initializeDefaultPreferences() {
		IPreferenceStore store = MyUI.getDefault().getPreferenceStore();
....
		store.setDefault(PreferenceConstants.EDITOR_FOLDING_ENABLED, true);
....
	}
}

private boolean isFoldingEnabled() {
  return getPreferenceStore().getBoolean(PreferenceConstants.EDITOR_FOLDING_ENABLED);
}

public class YourPreferenceInitializer extends AbstractPreferenceInitializer {

	@Override
	public void initializeDefaultPreferences() {
		IPreferenceStore store = Activator.getDefault().getPreferenceStore();
		// ...		
		store.setDefault( PreferenceConstants.EDITOR_DOCS_FOLDING_ENABLED, true);

	}

}