1 //////////////////////////////////////////////////////////////////////////////// 2 // checkstyle: Checks Java source code for adherence to a set of rules. 3 // Copyright (C) 2001-2019 the original author or authors. 4 // 5 // This library is free software; you can redistribute it and/or 6 // modify it under the terms of the GNU Lesser General Public 7 // License as published by the Free Software Foundation; either 8 // version 2.1 of the License, or (at your option) any later version. 9 // 10 // This library is distributed in the hope that it will be useful, 11 // but WITHOUT ANY WARRANTY; without even the implied warranty of 12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 // Lesser General Public License for more details. 14 // 15 // You should have received a copy of the GNU Lesser General Public 16 // License along with this library; if not, write to the Free Software 17 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 //////////////////////////////////////////////////////////////////////////////// 19 20 package com.puppycrawl.tools.checkstyle.internal.utils; 21 22 import java.util.List; 23 import java.util.stream.Collectors; 24 25 import com.puppycrawl.tools.checkstyle.xpath.AbstractNode; 26 import net.sf.saxon.om.Item; 27 import net.sf.saxon.om.NodeInfo; 28 import net.sf.saxon.sxpath.XPathDynamicContext; 29 import net.sf.saxon.sxpath.XPathEvaluator; 30 import net.sf.saxon.sxpath.XPathExpression; 31 import net.sf.saxon.trans.XPathException; 32 33 /** 34 * XpathUtil. 35 * @noinspection ClassOnlyUsedInOnePackage 36 */ 37 public final class XpathUtil { 38 39 private XpathUtil() { 40 } 41 42 /** 43 * Returns list of nodes matching xpath expression given node context. 44 * @param xpath Xpath expression 45 * @param rootNode {@code NodeInfo} node context 46 * @return list of nodes matching xpath expression given node context 47 */ 48 public static List<NodeInfo> getXpathItems(String xpath, AbstractNode rootNode) 49 throws XPathException { 50 final XPathEvaluator xpathEvaluator = new XPathEvaluator(); 51 final XPathExpression xpathExpression = xpathEvaluator.createExpression(xpath); 52 final XPathDynamicContext xpathDynamicContext = xpathExpression 53 .createDynamicContext(rootNode); 54 final List<Item<?>> items = xpathExpression.evaluate(xpathDynamicContext); 55 return items.stream().map(item -> (NodeInfo) item).collect(Collectors.toList()); 56 } 57 58 }