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src/share/jaxws_classes/com/sun/tools/internal/xjc/reader/gbind/Sequence.java@0989ad8c0860 (annotated)

src/share/jaxws_classes/com/sun/tools/internal/xjc/reader/gbind/Sequence.java

Tue, 09 Apr 2013 14:51:13 +0100

author

alanb

date

Tue, 09 Apr 2013 14:51:13 +0100

changeset 368

0989ad8c0860

parent 0

373ffda63c9a

permissions

-rw-r--r--

8010393: Update JAX-WS RI to 2.2.9-b12941
Reviewed-by: alanb, erikj
Contributed-by: miroslav.kos@oracle.com, martin.grebac@oracle.com

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	package com.sun.tools.internal.xjc.reader.gbind;
aoqi@0	27
aoqi@0	28	/**
aoqi@0	29	* {@link Expression} that represents a concatanation of two expressions
aoqi@0	30	* "A,B".
aoqi@0	31	*
aoqi@0	32	* @author Kohsuke Kawaguchi
aoqi@0	33	*/
aoqi@0	34	public final class Sequence extends Expression {
aoqi@0	35	/**
aoqi@0	36	* 'A' of 'A,B'
aoqi@0	37	*/
aoqi@0	38	private final Expression lhs;
aoqi@0	39	/**
aoqi@0	40	* 'B' of 'A,B'
aoqi@0	41	*/
aoqi@0	42	private final Expression rhs;
aoqi@0	43	/**
aoqi@0	44	* Compute this value eagerly for better performance
aoqi@0	45	*/
aoqi@0	46	private final boolean isNullable;
aoqi@0	47
aoqi@0	48	/**
aoqi@0	49	* Cached value of {@link #lastSet()} for better performance.
aoqi@0	50	* Sequence tends to be where the recursive lastSet computation occurs.
aoqi@0	51	*/
aoqi@0	52	private ElementSet lastSet;
aoqi@0	53
aoqi@0	54	public Sequence(Expression lhs, Expression rhs) {
aoqi@0	55	this.lhs = lhs;
aoqi@0	56	this.rhs = rhs;
aoqi@0	57	isNullable = lhs.isNullable() && rhs.isNullable();
aoqi@0	58	}
aoqi@0	59
aoqi@0	60	ElementSet lastSet() {
aoqi@0	61	if(lastSet==null) {
aoqi@0	62	if(rhs.isNullable())
aoqi@0	63	lastSet = ElementSets.union(lhs.lastSet(),rhs.lastSet());
aoqi@0	64	else
aoqi@0	65	lastSet = rhs.lastSet();
aoqi@0	66	}
aoqi@0	67	return lastSet;
aoqi@0	68	}
aoqi@0	69
aoqi@0	70	boolean isNullable() {
aoqi@0	71	return isNullable;
aoqi@0	72	}
aoqi@0	73
aoqi@0	74	void buildDAG(ElementSet incoming) {
aoqi@0	75	lhs.buildDAG(incoming);
aoqi@0	76	if(lhs.isNullable())
aoqi@0	77	rhs.buildDAG(ElementSets.union(incoming,lhs.lastSet()));
aoqi@0	78	else
aoqi@0	79	rhs.buildDAG(lhs.lastSet());
aoqi@0	80	}
aoqi@0	81
aoqi@0	82	public String toString() {
aoqi@0	83	return '('+lhs.toString()+','+rhs.toString()+')';
aoqi@0	84	}
aoqi@0	85	}