Mercurial > hg > release > icedtea7-forest-2.1 > jaxws
view sources/jaxws_src/src/com/sun/tools/internal/xjc/reader/gbind/Sequence.java @ 282:78c175236707
Update to jdk7-jaxws-2009_09_28.zip
author | andrew |
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date | Thu, 22 Sep 2011 02:57:13 +0100 |
parents | c608b38af726 |
children | 4f4a2cd249d8 |
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/* * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Sun designates this * particular file as subject to the "Classpath" exception as provided * by Sun in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. */ package com.sun.tools.internal.xjc.reader.gbind; /** * {@link Expression} that represents a concatanation of two expressions * "A,B". * * @author Kohsuke Kawaguchi */ public final class Sequence extends Expression { /** * 'A' of 'A,B' */ private final Expression lhs; /** * 'B' of 'A,B' */ private final Expression rhs; /** * Compute this value eagerly for better performance */ private final boolean isNullable; /** * Cached value of {@link #lastSet()} for better performance. * Sequence tends to be where the recursive lastSet computation occurs. */ private ElementSet lastSet; public Sequence(Expression lhs, Expression rhs) { this.lhs = lhs; this.rhs = rhs; isNullable = lhs.isNullable() && rhs.isNullable(); } ElementSet lastSet() { if(lastSet==null) { if(rhs.isNullable()) lastSet = ElementSets.union(lhs.lastSet(),rhs.lastSet()); else lastSet = rhs.lastSet(); } return lastSet; } boolean isNullable() { return isNullable; } void buildDAG(ElementSet incoming) { lhs.buildDAG(incoming); if(lhs.isNullable()) rhs.buildDAG(ElementSets.union(incoming,lhs.lastSet())); else rhs.buildDAG(lhs.lastSet()); } public String toString() { return '('+lhs.toString()+','+rhs.toString()+')'; } }