DiffElement.java

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package org.netbeans.modules.refactoring.ruby;

import java.io.IOException;
import java.lang.ref.WeakReference;
import org.netbeans.modules.csl.spi.support.ModificationResult;
import org.netbeans.modules.csl.spi.support.ModificationResult.Difference;
import org.netbeans.modules.refactoring.spi.SimpleRefactoringElementImplementation;
import org.netbeans.modules.refactoring.ruby.ui.tree.ElementGripFactory;
import org.openide.filesystems.FileObject;
import org.openide.text.PositionBounds;
import org.openide.text.PositionRef;
import org.openide.util.Exceptions;
import org.openide.util.Lookup;
import org.openide.util.lookup.Lookups;

/**
 *
 * @author Jan Becicka
 */
 public class DiffElement extends SimpleRefactoringElementImplementation {
     
    private PositionBounds bounds;
    private String displayText;
    private FileObject parentFile;
    private Difference diff;
    private ModificationResult modification;
    private WeakReference<String> newFileContent;
    
    public DiffElement(Difference diff, PositionBounds bounds, FileObject parentFile, ModificationResult modification) {
        this.bounds = bounds;
        this.displayText = diff.getDescription();
        this.parentFile = parentFile;
        this.diff = diff;
        this.modification = modification;
    }

    public String getDisplayText() {
        return displayText;
    }

    public Lookup getLookup() {
        Object composite = ElementGripFactory.getDefault().get(parentFile, bounds.getBegin().getOffset());
        if (composite==null) 
            composite = parentFile;
        return Lookups.fixed(composite, diff);
    }
    
    @Override
    public void setEnabled(boolean enabled) {
        diff.exclude(!enabled);
        newFileContent = null;
        super.setEnabled(enabled);
    }

    public PositionBounds getPosition() {
        return bounds;
    }

    public String getText() {
        return displayText;
    }

    public void performChange() {
    }

    public FileObject getParentFile() {
        return parentFile;
    }
    
    @Override
    protected String getNewFileContent() {
        String result;
        if (newFileContent !=null) {
            result = newFileContent.get();
            if (result!=null)
                return result;
        }
        try {
            result = modification.getResultingSource(parentFile);
        } catch (IOException ex) {
            Exceptions.printStackTrace(ex);
            return null;
        }
        newFileContent = new WeakReference<String>(result);
        return result;
    }
    
    public static DiffElement create(Difference diff, FileObject fileObject, ModificationResult modification) {
        PositionRef start = diff.getStartPosition();
        PositionRef end = diff.getEndPosition();
        PositionBounds bounds = new PositionBounds(start, end);
        return new DiffElement(diff, bounds, fileObject, modification);
    }    
}