com.google.errorprone.refaster.UBreak Maven / Gradle / Ivy
/*
* Copyright 2014 The Error Prone Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.errorprone.refaster;
import com.google.errorprone.util.RuntimeVersion;
import com.sun.source.tree.BreakTree;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.TreeVisitor;
import com.sun.tools.javac.tree.JCTree.JCBreak;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.TreeMaker;
import com.sun.tools.javac.util.Name;
import java.util.Objects;
import javax.annotation.Nullable;
/**
* {@code UTree} representation of {@code BreakTree}.
*
* @author [email protected] (Louis Wasserman)
*/
final class UBreak extends USimpleStatement implements BreakTree {
private final StringName label;
UBreak(StringName label) {
this.label = label;
}
static UBreak create(@Nullable CharSequence label) {
return new UBreak((label == null) ? null : StringName.of(label));
}
// TODO(b/176098078): Add @Override once compiling JDK 12+
@Nullable
public ExpressionTree getValue() {
return null;
}
@Override
@Nullable
public StringName getLabel() {
return label;
}
@Override
public Kind getKind() {
return Kind.BREAK;
}
@Override
public R accept(TreeVisitor visitor, D data) {
return visitor.visitBreak(this, data);
}
private ULabeledStatement.Key key() {
return new ULabeledStatement.Key(getLabel());
}
@Override
public JCBreak inline(Inliner inliner) {
return makeBreak(ULabeledStatement.inlineLabel(getLabel(), inliner), inliner);
}
private static JCBreak makeBreak(Name label, Inliner inliner) {
try {
if (RuntimeVersion.isAtLeast12()) {
return (JCBreak)
TreeMaker.class
.getMethod("Break", JCExpression.class)
.invoke(inliner.maker(), inliner.maker().Ident(label));
} else {
return (JCBreak)
TreeMaker.class.getMethod("Break", Name.class).invoke(inliner.maker(), label);
}
} catch (ReflectiveOperationException e) {
throw new LinkageError(e.getMessage(), e);
}
}
@Override
public Choice visitBreak(BreakTree node, Unifier unifier) {
if (getLabel() == null) {
return Choice.condition(node.getLabel() == null, unifier);
} else {
CharSequence boundName = unifier.getBinding(key());
return Choice.condition(
boundName != null && node.getLabel().contentEquals(boundName), unifier);
}
}
@Override
public int hashCode() {
return Objects.hashCode(label);
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof UBreak)) {
return false;
}
UBreak other = (UBreak) obj;
return Objects.equals(label, other.label);
}
}