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/*
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* Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package com.sun.tools.javac.comp;
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import com.sun.tools.javac.util.*;
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import com.sun.tools.javac.tree.*;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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/** A class for environments, instances of which are passed as
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* arguments to tree visitors. Environments refer to important ancestors
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* of the subtree that's currently visited, such as the enclosing method,
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* the enclosing class, or the enclosing toplevel node. They also contain
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* a generic component, represented as a type parameter, to carry further
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* information specific to individual passes.
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*
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* <p><b>This is NOT part of any API supported by Sun Microsystems. If
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* you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public class Env<A> implements Iterable<Env<A>> {
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/** The next enclosing environment.
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*/
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public Env<A> next;
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/** The environment enclosing the current class.
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*/
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public Env<A> outer;
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/** The tree with which this environment is associated.
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*/
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public JCTree tree;
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/** The enclosing toplevel tree.
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*/
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public JCTree.JCCompilationUnit toplevel;
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/** The next enclosing class definition.
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*/
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public JCTree.JCClassDecl enclClass;
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/** The next enclosing method definition.
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*/
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public JCTree.JCMethodDecl enclMethod;
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/** A generic field for further information.
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*/
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public A info;
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/** Is this an environment for evaluating a base clause?
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*/
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public boolean baseClause = false;
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/** Create an outermost environment for a given (toplevel)tree,
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* with a given info field.
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*/
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public Env(JCTree tree, A info) {
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this.next = null;
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this.outer = null;
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this.tree = tree;
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this.toplevel = null;
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this.enclClass = null;
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this.enclMethod = null;
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this.info = info;
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}
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/** Duplicate this environment, updating with given tree and info,
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* and copying all other fields.
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*/
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public Env<A> dup(JCTree tree, A info) {
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return dupto(new Env<A>(tree, info));
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}
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/** Duplicate this environment into a given Environment,
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* using its tree and info, and copying all other fields.
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*/
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public Env<A> dupto(Env<A> that) {
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that.next = this;
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that.outer = this.outer;
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that.toplevel = this.toplevel;
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that.enclClass = this.enclClass;
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that.enclMethod = this.enclMethod;
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return that;
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}
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/** Duplicate this environment, updating with given tree,
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* and copying all other fields.
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*/
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public Env<A> dup(JCTree tree) {
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return dup(tree, this.info);
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}
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/** Return closest enclosing environment which points to a tree with given tag.
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*/
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public Env<A> enclosing(int tag) {
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Env<A> env1 = this;
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while (env1 != null && env1.tree.getTag() != tag) env1 = env1.next;
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return env1;
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}
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public String toString() {
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return "Env[" + info + (outer == null ? "" : ",outer=" + outer) + "]";
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}
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public Iterator<Env<A>> iterator() {
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return new Iterator<Env<A>>() {
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Env<A> next = Env.this;
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public boolean hasNext() {
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return next.outer != null;
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}
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public Env<A> next() {
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if (hasNext()) {
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Env<A> current = next;
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next = current.outer;
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return current;
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}
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throw new NoSuchElementException();
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}
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public void remove() {
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throw new UnsupportedOperationException();
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}
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};
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}
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}
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