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/*
* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package compiler.lib.template_framework;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Optional;
import jdk.test.lib.Utils;
/**
* The {@link NameSet} defines a set of {@link Name}s (e.g. fields or variable names). They extend the
* set of the {@code 'parent'} set.
*/
class NameSet {
private static final Random RANDOM = Utils.getRandomInstance();
private final NameSet parent;
private final List<NameSet> children = new ArrayList<>();
private final List<Name> names = new ArrayList<>();
interface Predicate {
boolean check(Name type);
}
NameSet(NameSet parent) {
this.parent = parent;
if (parent != null) { parent.registerChild(this); }
}
void registerChild(NameSet child) {
children.add(child);
}
private long weight(Predicate predicate) {
long w = names.stream().filter(predicate::check).mapToInt(Name::weight).sum();
if (parent != null) { w += parent.weight(predicate); }
return w;
}
public int count(Predicate predicate) {
int c = (int)names.stream().filter(predicate::check).count();
if (parent != null) { c += parent.count(predicate); }
return c;
}
public boolean hasAny(Predicate predicate) {
return names.stream().anyMatch(predicate::check) ||
(parent != null && parent.hasAny(predicate));
}
public List<Name> toList(Predicate predicate) {
List<Name> list = (parent != null) ? parent.toList(predicate)
: new ArrayList<>();
list.addAll(names.stream().filter(predicate::check).toList());
return list;
}
/**
* Randomly sample a name from this set or a parent set, restricted to the predicate.
*/
public Name sample(Predicate predicate) {
long w = weight(predicate);
if (w <= 0) {
// Negative weight should never happen, as all names have positive weight.
if (w < 0) {
throw new RuntimeException("Negative weight not allowed: " + w);
}
// If the weight is zero, there is no matching Name available.
// Return null, and let the caller handle the situation, e.g.
// throw an exception.
return null;
}
long r = RANDOM.nextLong(w);
return sample(predicate, r);
}
private Name sample(Predicate predicate, long r) {
for (var name : names) {
if (predicate.check(name)) {
r -= name.weight();
if (r < 0) { return name; }
}
}
return parent.sample(predicate, r);
}
private Name findLocal(String name) {
Optional<Name> opt = names.stream().filter(n -> n.name().equals(name)).findAny();
return opt.orElse(null);
}
private Name findParents(String name) {
if (parent == null) { return null; }
Name n = parent.findLocal(name);
if (n != null) { return n; }
return parent.findParents(name);
}
private Name findChildren(String name) {
for (NameSet child : children) {
Name n1 = child.findLocal(name);
if (n1 != null) { return n1; }
Name n2 = child.findChildren(name);
if (n2 != null) { return n2; }
}
return null;
}
private Name find(String name) {
Name n1 = findLocal(name);
if (n1 != null) { return n1; }
Name n2 = findParents(name);
if (n2 != null) { return n2; }
return findChildren(name);
}
/**
* Add a variable of a specified type to the set.
*/
public void add(Name name) {
Name other = find(name.name());
if (other != null) {
throw new RendererException("Duplicate name: " + name + ", previously: " + other);
}
names.add(name);
}
}
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