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/*
 * 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.*;
import org.codehaus.groovy.control.SourceUnit;

import java.util.concurrent.atomic.AtomicReference;

/**
 * A visitor used as a callback to {@link org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor#existsProperty(org.codehaus.groovy.ast.expr.PropertyExpression, boolean, org.codehaus.groovy.ast.ClassCodeVisitorSupport)}
 * which will return set the type of the found property in the provided reference.
 *
 * @author Cedric Champeau
 */
class PropertyLookupVisitor extends ClassCodeVisitorSupport {
    private final AtomicReference result;

    public PropertyLookupVisitor(final AtomicReference result) {
        this.result = result;
    }

    @Override
    protected SourceUnit getSourceUnit() {
        return null;
    }

    @Override
    public void visitMethod(final MethodNode node) {
        result.set(node.getReturnType());
    }

    @Override
    public void visitProperty(final PropertyNode node) {
        result.set(node.getType());
    }

    @Override
    public void visitField(final FieldNode field) {
        result.set(field.getType());
    }
}