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/*******************************************************************************
* Copyright (c) 2014 Red Hat, Inc.
* 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:
* Red Hat - initial API and implementation
*******************************************************************************/
package org.eclipse.linuxtools.internal.systemtap.ui.ide.structures;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.linuxtools.internal.systemtap.ui.ide.IDEPlugin;
import org.eclipse.linuxtools.systemtap.structures.TreeNode;
/**
* A base abstract class to be used for extensions of {@link TapsetParser}
* that construct a displayable {@link TreeNode}.
*/
public abstract class TreeTapsetParser extends TapsetParser {
protected TreeNode tree = null;
private TreeNode forcedTree = null;
protected TreeTapsetParser(String jobTitle) {
super(jobTitle);
}
/**
* Prepares the parser for a run. Clients must override this method to perform
* actions during the run; a call to super.run() is necessary.
*/
@Override
protected final synchronized IStatus run(IProgressMonitor monitor) {
if (forcedTree != null) {
tree = forcedTree;
forcedTree = null;
return new Status(IStatus.OK, IDEPlugin.PLUGIN_ID, ""); //$NON-NLS-1$
} else {
tree = new TreeNode(null, false);
return runAction(monitor);
}
}
protected IStatus runAction(IProgressMonitor monitor) {
return new Status(!monitor.isCanceled() ? IStatus.OK : IStatus.CANCEL,
IDEPlugin.PLUGIN_ID, ""); //$NON-NLS-1$
}
/**
* @return The tree that this parser constructs.
*/
public final synchronized TreeNode getTree() {
return tree;
}
/**
* Forcefully set this parser's tree, and subsequently fire update events
* that normally get called when a parse operation completes.
* @param tree The tree to put into this parser.
*/
final synchronized void setTree(TreeNode tree) {
String errorMessage = isValidTree(tree);
if (errorMessage != null) {
throw new IllegalArgumentException(errorMessage);
}
cancel();
forcedTree = tree;
schedule();
}
/**
* Check if the provided tree a valid tree for this parser.
* Called internally by {@link #setTree(TreeNode)}.
* @param tree The tree to check for validity.
* @return <code>null</code> if the tree is valid; otherwise,
* an error message signifying why the tree is invalid.
*/
protected String isValidTree(TreeNode tree) {
return null;
}
}
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