| /* Copyright 2004 The Apache Software Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.xmlbeans.impl.xpath.xmlbeans; |
| |
| import org.apache.xmlbeans.impl.store.Cur; |
| import org.apache.xmlbeans.impl.store.Locale; |
| import org.apache.xmlbeans.impl.xpath.XPath; |
| import org.apache.xmlbeans.impl.xpath.XPathEngine; |
| import org.apache.xmlbeans.impl.xpath.XPathExecutionContext; |
| |
| import java.util.ConcurrentModificationException; |
| |
| class XmlbeansXPathEngine extends XPathExecutionContext implements XPathEngine { |
| XmlbeansXPathEngine(XPath xpath, Cur c) { |
| assert c.isContainer(); |
| |
| _version = c.getLocale().version(); |
| _cur = c.weakCur(this); |
| |
| _cur.push(); |
| |
| init(xpath); |
| |
| int ret = start(); |
| |
| if ((ret & HIT) != 0) { |
| c.addToSelection(); |
| } |
| |
| doAttrs(ret, c); |
| |
| if ((ret & DESCEND) == 0 || !Locale.toFirstChildElement(_cur)) { |
| release(); |
| } |
| } |
| |
| private void advance(Cur c) { |
| assert _cur != null; |
| |
| if (_cur.isFinish()) { |
| if (_cur.isAtEndOfLastPush()) { |
| release(); |
| } else { |
| end(); |
| _cur.next(); |
| } |
| } else if (_cur.isElem()) { |
| int ret = element(_cur.getName()); |
| |
| if ((ret & HIT) != 0) { |
| c.addToSelection(_cur); |
| } |
| |
| doAttrs(ret, c); |
| |
| if ((ret & DESCEND) == 0 || !Locale.toFirstChildElement(_cur)) { |
| end(); |
| _cur.skip(); |
| } |
| } else { |
| do { |
| _cur.next(); |
| } |
| while (!_cur.isContainerOrFinish()); |
| } |
| } |
| |
| private void doAttrs(int ret, Cur c) { |
| assert _cur.isContainer(); |
| |
| if ((ret & ATTRS) != 0) { |
| if (_cur.toFirstAttr()) { |
| do { |
| if (attr(_cur.getName())) { |
| c.addToSelection(_cur); |
| } |
| } |
| while (_cur.toNextAttr()); |
| |
| _cur.toParent(); |
| } |
| } |
| } |
| |
| public boolean next(Cur c) { |
| if (_cur != null && _version != _cur.getLocale().version()) { |
| throw new ConcurrentModificationException("Document changed during select"); |
| } |
| |
| int startCount = c.selectionCount(); |
| |
| while (_cur != null) { |
| advance(c); |
| |
| if (startCount != c.selectionCount()) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| public void release() { |
| if (_cur != null) { |
| _cur.release(); |
| _cur = null; |
| } |
| } |
| |
| private final long _version; |
| private Cur _cur; |
| } |
| |