StubUtility.java

package org.rubypeople.rdt.internal.corext.codemanipulation;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.ProjectScope;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.preferences.IScopeContext;
import org.eclipse.core.runtime.preferences.InstanceScope;
import org.rubypeople.rdt.core.IOpenable;
import org.rubypeople.rdt.core.IRubyElement;
import org.rubypeople.rdt.core.IRubyProject;
import org.rubypeople.rdt.core.RubyModelException;

public class StubUtility {

	/**
	 * Returns the line delimiter which is used in the specified project.
	 * 
	 * @param project the ruby project, or <code>null</code>
	 * @return the used line delimiter
	 */
	public static String getLineDelimiterUsed(IRubyProject project) {
		return getProjectLineDelimiter(project);
	}
	
	private static String getProjectLineDelimiter(IRubyProject javaProject) {
		IProject project= null;
		if (javaProject != null)
			project= javaProject.getProject();
		
		String lineDelimiter= getLineDelimiterPreference(project);
		if (lineDelimiter != null)
			return lineDelimiter;
		
		return System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$
	}
	
	public static String getLineDelimiterPreference(IProject project) {
		IScopeContext[] scopeContext;
		if (project != null) {
			// project preference
			scopeContext= new IScopeContext[] { new ProjectScope(project) };
			String lineDelimiter= Platform.getPreferencesService().getString(Platform.PI_RUNTIME, Platform.PREF_LINE_SEPARATOR, null, scopeContext);
			if (lineDelimiter != null)
				return lineDelimiter;
		}
		// workspace preference
		scopeContext= new IScopeContext[] { new InstanceScope() };
		String platformDefault= System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$
		return Platform.getPreferencesService().getString(Platform.PI_RUNTIME, Platform.PREF_LINE_SEPARATOR, platformDefault, scopeContext);
	}

	/**
	 * Examines a string and returns the first line delimiter found.
	 */
	public static String getLineDelimiterUsed(IRubyElement elem) {
		while (elem != null && !(elem instanceof IOpenable)) {
			elem= elem.getParent();
		}
		if (elem != null) {
			try {
				return ((IOpenable) elem).findRecommendedLineSeparator();
			} catch (RubyModelException exception) {
				// Use project setting
			}
		}
		return getProjectLineDelimiter(null);
	}
}