CounterexampleHover.java

package org.jmlspecs.openjml.eclipse;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor;
import org.eclipse.jdt.ui.text.java.hover.IJavaEditorTextHover;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextHover;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Region;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IFileEditorInput;

public class CounterexampleHover implements IJavaEditorTextHover {
	
	IEditorPart editor;
	IResource res;
	IJavaProject currentProject;
	
	@Override
	public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
		// TODO Auto-generated method stub
		
		try {
			//Object o = ((CompilationUnitEditor)textViewer).
			if (res == null) return null;
			int pos = hoverRegion.getOffset();
			int end = pos + hoverRegion.getLength();
			String value = Activator.utils().getInterface(currentProject).getCEValue(pos, end, null, res);
			//if (value != null) Log.log("Counterexample hover: " + value);
			return value == null ? null : ("Counterexample: " + value);
		} catch (Exception e) {
			return null;
		}
	}

	@Override
	public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
		Point selection= textViewer.getSelectedRange();
		if (selection.x <= offset && offset < selection.x + selection.y)
			return new Region(selection.x, selection.y);
		return new Region(offset, 0);
	}

	@Override
	public void setEditor(IEditorPart editor) {
		this.editor = editor;
		try {
			IEditorInput einput = editor.getEditorInput();
			res = (IResource)einput.getAdapter(IResource.class);

			IFileEditorInput input = (IFileEditorInput) einput;
			IProject p = input.getFile().getProject();
			currentProject = p.hasNature(JavaCore.NATURE_ID) ? JavaCore.create(p) : null;
		} catch (Exception e) {
			res = null;
			currentProject = null;
		}
	}

	
}