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Groovy: A powerful, dynamic language for the JVM
/*
* Copyright 2003-2012 the original author or 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 org.codehaus.groovy.transform.stc;
import org.codehaus.groovy.ast.ClassCodeVisitorSupport;
import org.codehaus.groovy.ast.expr.VariableExpression;
import org.codehaus.groovy.control.SourceUnit;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* A visitor which collects the list of variable expressions which are closure shared.
*/
public class SharedVariableCollector extends ClassCodeVisitorSupport {
private final SourceUnit unit;
private final Set closureSharedExpressions = new LinkedHashSet();
private boolean visited = false;
public SharedVariableCollector(final SourceUnit unit) {
this.unit = unit;
}
@Override
protected SourceUnit getSourceUnit() {
return unit;
}
public Set getClosureSharedExpressions() {
return Collections.unmodifiableSet(closureSharedExpressions);
}
@Override
public void visitVariableExpression(final VariableExpression expression) {
if (visited) {
// we should not visit embedded closures recursively
return;
}
visited = true;
if (expression.isClosureSharedVariable()) closureSharedExpressions.add(expression);
super.visitVariableExpression(expression);
}
}