138 lines
4.6 KiB
Java
138 lines
4.6 KiB
Java
/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* Copyright (C) 2004-2011
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.sun.xml.internal.rngom.binary;
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public class PatternBuilder {
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private final EmptyPattern empty;
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protected final NotAllowedPattern notAllowed;
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protected final PatternInterner interner;
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public PatternBuilder() {
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empty = new EmptyPattern();
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notAllowed = new NotAllowedPattern();
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interner = new PatternInterner();
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}
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public PatternBuilder(PatternBuilder parent) {
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empty = parent.empty;
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notAllowed = parent.notAllowed;
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interner = new PatternInterner(parent.interner);
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}
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Pattern makeEmpty() {
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return empty;
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}
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Pattern makeNotAllowed() {
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return notAllowed;
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}
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Pattern makeGroup(Pattern p1, Pattern p2) {
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if (p1 == empty)
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return p2;
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if (p2 == empty)
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return p1;
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if (p1 == notAllowed || p2 == notAllowed)
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return notAllowed;
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if (false && p1 instanceof GroupPattern) {
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GroupPattern sp = (GroupPattern)p1;
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return makeGroup(sp.p1, makeGroup(sp.p2, p2));
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}
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Pattern p = new GroupPattern(p1, p2);
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return interner.intern(p);
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}
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Pattern makeInterleave(Pattern p1, Pattern p2) {
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if (p1 == empty)
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return p2;
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if (p2 == empty)
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return p1;
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if (p1 == notAllowed || p2 == notAllowed)
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return notAllowed;
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if (false && p1 instanceof InterleavePattern) {
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InterleavePattern ip = (InterleavePattern)p1;
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return makeInterleave(ip.p1, makeInterleave(ip.p2, p2));
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}
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if (false) {
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if (p2 instanceof InterleavePattern) {
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InterleavePattern ip = (InterleavePattern)p2;
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if (p1.hashCode() > ip.p1.hashCode())
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return makeInterleave(ip.p1, makeInterleave(p1, ip.p2));
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}
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else if (p1.hashCode() > p2.hashCode())
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return makeInterleave(p2, p1);
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}
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Pattern p = new InterleavePattern(p1, p2);
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return interner.intern(p);
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}
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Pattern makeChoice(Pattern p1, Pattern p2) {
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if (p1 == empty && p2.isNullable())
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return p2;
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if (p2 == empty && p1.isNullable())
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return p1;
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Pattern p = new ChoicePattern(p1, p2);
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return interner.intern(p);
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}
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Pattern makeOneOrMore(Pattern p) {
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if (p == empty
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|| p == notAllowed
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|| p instanceof OneOrMorePattern)
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return p;
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Pattern p1 = new OneOrMorePattern(p);
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return interner.intern(p1);
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}
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Pattern makeOptional(Pattern p) {
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return makeChoice(p, empty);
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}
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Pattern makeZeroOrMore(Pattern p) {
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return makeOptional(makeOneOrMore(p));
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}
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}
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