/*
 * @(#)Scope.java	1.1 06/06/24
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 * Use and Distribution is subject to the Java Research License available
 * at <http://wwws.sun.com/software/communitysource/jrl.html>.
 */

package com.sun.source.tree;

import com.sun.source.tree.Tree;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;

/**
 * Interface for determining locally available program elements, such as
 * local variables and imports. 
 * Upon creation, a Scope is associated with a given program position; 
 * for example, a {@linkplain Tree tree node}. This position may be used to
 * infer an enclosing method and/or class.
 * 
 * <p>A Scope does not itself contain the details of the elements corresponding 
 * to the parameters, methods and fields of the methods and classes containing
 * its position. However, these elements can be determined from the enclosing
 * elements.
 *
 * <p>Scopes may be contained in an enclosing scope. The outermost scope contains
 * those elements available via "star import" declarations; the scope within that
 * contains the top level elements of the compilation unit, including any named
 * imports.
 *
 * @since 1.6
 */
public interface Scope {
    /**
     * Returns the enclosing scope.
     */
    public Scope getEnclosingScope();
    
    /**
     * Returns the innermost type element containing the position of this scope
     */
    public TypeElement getEnclosingClass();
    
    /**
     * Returns the innermost executable element containing the position of this scope.
     */
    public ExecutableElement getEnclosingMethod();
    
    /**
     * Returns the elements directly contained in this scope.
     */
    public Iterable<? extends Element> getLocalElements();
}
