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/*******************************************************************************
* Copyright (c) 2012 Wind River Systems, Inc. and others.
* 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.internal.debug.ui.model;
import java.util.Arrays;
import java.util.Set;
import java.util.TreeSet;
import org.eclipse.tcf.util.TCFDataCache;
/**
* Cache item that contains children of the node.
* The list of children is filtered according to the context query and context filter.
* An element in the list either matches both query and filter,
* or it is an ancestor of a matching node.
*/
public class TCFContextQueryDescendants extends TCFDataCache<Set<String>> {
private final TCFNode node;
private String[] query_data;
private Set<String> filter;
TCFContextQueryDescendants(TCFNode node) {
super(node.getChannel());
this.node = node;
}
public boolean setQuery(String query, Set<String> filter, Runnable done) {
String[] query_data = null;
TCFDataCache<String[]> query_cache = node.getModel().getLaunch().getContextQuery(query);
if (query_cache != null) {
if (!query_cache.validate(done)) return false;
query_data = query_cache.getData();
}
if (!Arrays.equals(query_data, this.query_data)) reset();
this.query_data = query_data;
if (this.filter == filter) return true;
if (filter != null && filter.equals(this.filter)) return true;
this.filter = filter;
reset();
return true;
}
private boolean getDescendants(Set<String> descendants, String[] ids) {
TCFModel model = node.getModel();
for (String id : ids) {
if (!model.createNode(id, this)) return false;
if (isValid()) return true; // error creating a node
TCFNode n = model.getNode(id);
while (n != null) {
if ( n.parent == node || (n.parent == null && !(node instanceof TCFNodeExecContext)) ) {
descendants.add(id);
break;
}
n = n.parent;
}
}
return true;
}
@Override
protected boolean startDataRetrieval() {
Set<String> set = new TreeSet<String>();
if (query_data != null && !getDescendants(set, query_data)) return false;
if (isValid()) return true; // error creating a node
if (filter != null) {
Set<String> filtered = new TreeSet<String>();
if (!getDescendants(filtered, filter.toArray(new String[filter.size()]))) return false;
set.retainAll(filtered);
}
if (isValid()) return true; // error creating a node
set(null, null, set);
return true;
}
}
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