ScopeZoom.java

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package edu.rice.cs.hpc.viewer.scope;

import edu.rice.cs.hpc.data.experiment.scope.CallSiteScopeCallerView;
import edu.rice.cs.hpc.data.experiment.scope.Scope;

public class ScopeZoom {
    // --------------------------------------------------------------------
    //  ATTRIBUTES
    // --------------------------------------------------------------------
    private ScopeTreeViewer viewer;
    private ScopeViewActionsGUI objActionsGUI;
    
    private java.util.Stack<Scope> stackRootTree;
    private java.util.Stack<Object[]> stackTreeStates;

    // --------------------------------------------------------------------
    //  CONSTRUCTORS
    // --------------------------------------------------------------------
    public ScopeZoom ( ScopeTreeViewer treeViewer, ScopeViewActionsGUI objGUI ) {
        this.viewer = treeViewer;
        this.objActionsGUI = objGUI;
        stackRootTree = new java.util.Stack<Scope>();
        stackTreeStates = new java.util.Stack<Object[]>();
    }
    
    // --------------------------------------------------------------------
    //  METHODS
    // --------------------------------------------------------------------
    public void zoomIn (Scope current, Scope old) {
        // ---------------------- save the current view
        this.stackRootTree.push(old); // save the node for future zoom-out
        Object treeStates[] = viewer.getExpandedElements();
        this.stackTreeStates.push(treeStates);
        // ---------------------- 

        viewer.setInput(current);
        // we need to insert the selected node on the top of the table
        // FIXME: this approach is not elegant, but we don't have any choice
        //          at the moment
        this.objActionsGUI.insertParentNode(current);
    }
    
    public void zoomOut () {
        Scope parent; 
        if(this.stackRootTree.size()>0) {
            // the tree has been zoomed
            parent = this.stackRootTree.pop();
        } else {
            // case where the tree hasn't been zoomed
            // FIXME: there must be a bug if the code comes to here !
            parent = (Scope)viewer.getInput();
            throw( new java.lang.RuntimeException("ScopeViewActions - illegal zoomout"+parent));
        }

        viewer.setInput( parent );
        // Bug fix: we need to insert the parent on the top of the table
        this.objActionsGUI.insertParentNode(parent);

        // return the previous expanded tree items
        if(this.stackTreeStates.size()>0) {
            Object o[] = this.stackTreeStates.pop();
            viewer.setExpandedElements(o);
        }
    }
    
    public boolean canZoomOut () {
        boolean bRet = (this.stackRootTree != null);
        if (bRet) {
            bRet = ( this.stackRootTree.size()>0 );
        }
        return bRet;
    }
    
    public boolean canZoomIn ( Scope node ) {
        if (node == null)
            return false;
        if (node instanceof CallSiteScopeCallerView) {
            // in caller view, we don't know exactly how many children a scope has
            // the most reliable way is to retrieve the "mark" if the scope has a child or not
            return ((CallSiteScopeCallerView)node).hasScopeChildren();
        }
        return ( node.getChildCount()>0 );
    }
    
    public void setViewer ( ScopeTreeViewer treeViewer ) {
        viewer = treeViewer;
    }
}