GetLayoutPropertyValueOperation.java example

Explorer
edt-master
/*******************************************************************************
 * Copyright © 2008, 2013 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.edt.ide.rui.document.utils;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.Status;
import org.eclipse.edt.compiler.core.ast.ClassDataDeclaration;
import org.eclipse.edt.compiler.core.ast.DefaultASTVisitor;
import org.eclipse.edt.compiler.core.ast.Expression;
import org.eclipse.edt.compiler.core.ast.NewExpression;
import org.eclipse.edt.compiler.core.ast.Node;
import org.eclipse.edt.compiler.core.ast.SimpleName;
import org.eclipse.edt.ide.core.model.EGLCore;
import org.eclipse.edt.ide.core.model.EGLModelException;
import org.eclipse.edt.ide.core.model.IEGLFile;
import org.eclipse.edt.ide.core.model.document.IEGLDocument;
import org.eclipse.edt.ide.rui.internal.Activator;
import org.eclipse.edt.ide.rui.server.PropertyValue;
import org.eclipse.edt.ide.ui.internal.EGLUI;
import org.eclipse.edt.mof.utils.NameUtile;

public class GetLayoutPropertyValueOperation {
	
	private IEGLDocument currentDocument;
	private IFile currentFile;
	private PropertyValue propertyValue = null;
	private String layoutPropertyName = "layoutData";
	private Expression layoutData; 
	
	public GetLayoutPropertyValueOperation(IEGLDocument currentDocument, IFile currentFile){
		this.currentDocument = currentDocument;		
		this.currentFile = currentFile;
	}
	public PropertyValue getPropertyValue(final String propertyName, final String propertyType, final int widgetOffset, final int widgetLength){
		if(widgetOffset <= 0 || widgetLength <= 0){ return null; }; // Guard against invalid widget locations
		
		try{
			IEGLFile modelFile = (IEGLFile)EGLCore.create(currentFile);
			IEGLFile sharedWorkingCopy = (IEGLFile)modelFile.getSharedWorkingCopy(null, EGLUI.getBufferFactory(), null);
			sharedWorkingCopy.reconcile(false, null);
		
			try{
				final Node widgetReference = DocumentUtil.getWidgetNode(currentDocument,widgetOffset, widgetLength);		
				
				if(widgetReference != null){
					widgetReference.accept(new DefaultASTVisitor(){
						public boolean visit(final NewExpression newExpression){
							// This widget is anonymous
							if(newExpression.hasSettingsBlock()){
								AssignmentLocator locator = new AssignmentLocator(NameUtile.getAsName(layoutPropertyName));
								newExpression.getSettingsBlock().accept(locator);
								if(locator.getAssignment() != null){
									//processExpression(locator.getAssignment().getRightHandSide());
									layoutData = locator.getAssignment().getRightHandSide();
								}
							}
							return false;
						}
						public boolean visit(final SimpleName simpleName){
							Node parentNode = simpleName.getParent();
							if(parentNode != null){
								parentNode.accept(new DefaultASTVisitor(){
									public boolean visit(ClassDataDeclaration classDataDeclaration){
										if(classDataDeclaration.hasSettingsBlock()){
											AssignmentLocator locator = new AssignmentLocator(NameUtile.getAsName(layoutPropertyName));
											classDataDeclaration.getSettingsBlockOpt().accept(locator);
											if(locator.getAssignment() != null){
												layoutData = locator.getAssignment().getRightHandSide();
											}
										}
										return false;
									}
								});
							}
							return false;
						}					
					});
				}
				
				// Be defensive
				if(layoutData != null){
					layoutData.accept(new DefaultASTVisitor(){
						public boolean visit(final NewExpression newExpression){
							// This widget is anonymous
							processNewExpression(propertyName, propertyType, newExpression);
							return false;
						}
						public boolean visit(final SimpleName simpleName){
							PropertyValueVisitor visitor = new PropertyValueVisitor(propertyType);
							visitor.processExpression(simpleName);
							propertyValue = new PropertyValue(visitor.getResult(), visitor.propertyTypeMatch);
							return false;
						}					
					});
				}
			}catch(Exception e){
				Activator.getDefault().getLog().log(new Status(Status.ERROR, Activator.PLUGIN_ID, "Get Property Value: Error accessing property value", e));
			}finally{
				sharedWorkingCopy.destroy();					
			}
		}catch(EGLModelException e){
			Activator.getDefault().getLog().log(new Status(Status.ERROR, Activator.PLUGIN_ID, "Get Property Value: Error creating working copy", e));
		}
		
		return propertyValue;
	}
	
	private void processNewExpression(final String propertyName, final String propertyType, final NewExpression newExpression) {
		if(newExpression.hasSettingsBlock()){
			AssignmentLocator locator = new AssignmentLocator(NameUtile.getAsName(propertyName));
			newExpression.getSettingsBlock().accept(locator);
			if(locator.getAssignment() != null){
				//processExpression(locator.getAssignment().getRightHandSide());
				PropertyValueVisitor visitor = new PropertyValueVisitor(propertyType);
				visitor.processExpression(locator.getAssignment().getRightHandSide());
				propertyValue = new PropertyValue(visitor.getResult(), visitor.propertyTypeMatch);
			}
		}
	}
}