| /* |
| * Copyright 2003-2009 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.ClosureExpression; |
| 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<VariableExpression> closureSharedExpressions = new LinkedHashSet<VariableExpression>(); |
| private boolean visited = false; |
| public SharedVariableCollector(final SourceUnit unit) { |
| this.unit = unit; |
| } |
| |
| @Override |
| protected SourceUnit getSourceUnit() { |
| return unit; |
| } |
| |
| public Set<VariableExpression> 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); |
| } |
| |
| } |