import org.eclipse.compare.ResourceNode; //导入依赖的package包/类
@Override
protected Object prepareInput(IProgressMonitor pm) {
	try {
		ResourceNode ancestor = new ResourceNode(file);
		String ancestorContent = getContent(ancestor);
		String leftContent, rightContent;

		leftContent = this.comparisonFailure.getExpected();
		rightContent = this.comparisonFailure.getActual();
		if (!leftContent.equals(ancestorContent))
			getCompareConfiguration().setProperty(ICompareUIConstants.PROP_ANCESTOR_VISIBLE, Boolean.TRUE);
		CompareItem left = new EditableCompareItem("Left", leftContent, file);
		CompareItem right = new CompareItem("Right", rightContent);
		return new DiffNode(null, Differencer.CHANGE | Differencer.DIRECTION_MASK, ancestor, left, right);
	} catch (Throwable t) {
		LOG.error(t.getMessage(), t);
		Exceptions.throwUncheckedException(t);
		return null;
	}
}
 

import org.eclipse.compare.ResourceNode; //导入依赖的package包/类
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
	leftPlan = null;
	rightPlan = null;
	diffTrees = null;
	if (newInput instanceof ICompareInput) {
		ICompareInput input = (ICompareInput) newInput;
		ResourceNode left = (ResourceNode) input.getLeft();
		ResourceNode right = (ResourceNode) input.getRight();
		try {
			leftPlan = EPlanUtils.loadOnePlan(left.getResource());
			rightPlan = EPlanUtils.loadOnePlan(right.getResource());
			diffTrees = computeDiffTrees(leftPlan, rightPlan);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}
 

import org.eclipse.compare.ResourceNode; //导入依赖的package包/类
static final ITypedElement[] buildEditions(ITypedElement target, IFile file) {

		// setup array of editions
		IFileState[] states= null;
		// add available editions
		try {
			states= file.getHistory(null);
		} catch (CoreException ex) {
			JavaPlugin.log(ex);
		}

		int count= 1;
		if (states != null)
			count+= states.length;

		ITypedElement[] editions= new ITypedElement[count];
		editions[0]= new ResourceNode(file);
		if (states != null)
			for (int i= 0; i < states.length; i++)
				editions[i+1]= new HistoryItem(target, states[i]);
		return editions;
	}
 

import org.eclipse.compare.ResourceNode; //导入依赖的package包/类
final ITypedElement[] buildEditions(ITypedElement target, IFile file) {

		// setup array of editions
		IFileState[] states= null;
		// add available editions
		try {
			states= file.getHistory(null);
		} catch (CoreException ex) {
			JavaPlugin.log(ex);
		}

		int count= 1;
		if (states != null)
			count+= states.length;

		ITypedElement[] editions= new ITypedElement[count];
		editions[0]= new ResourceNode(file);
		if (states != null)
			for (int i= 0; i < states.length; i++)
				editions[i+1]= new HistoryItem(target, states[i]);
		return editions;
	}