| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.commons.text.lookup; |
| |
| import java.nio.file.Files; |
| import java.nio.file.Paths; |
| |
| import javax.xml.xpath.XPathFactory; |
| |
| import org.xml.sax.InputSource; |
| |
| /** |
| * Looks up keys from an XML document. |
| * <p> |
| * Looks up the value for a given key in the format "Document:XPath". |
| * </p> |
| * <p> |
| * For example: "com/domain/document.xml:/path/to/node". |
| * </p> |
| * |
| * @since 1.5 |
| */ |
| final class XmlStringLookup extends AbstractStringLookup { |
| |
| /** |
| * Defines the singleton for this class. |
| */ |
| static final XmlStringLookup INSTANCE = new XmlStringLookup(); |
| |
| /** |
| * No need to build instances for now. |
| */ |
| private XmlStringLookup() { |
| // empty |
| } |
| |
| /** |
| * Looks up the value for the key in the format "DocumentPath:XPath". |
| * <p> |
| * For example: "com/domain/document.xml:/path/to/node". |
| * </p> |
| * |
| * @param key |
| * the key to be looked up, may be null |
| * @return The value associated with the key. |
| */ |
| @Override |
| public String lookup(final String key) { |
| if (key == null) { |
| return null; |
| } |
| final String[] keys = key.split(SPLIT_STR); |
| final int keyLen = keys.length; |
| if (keyLen != 2) { |
| throw IllegalArgumentExceptions.format("Bad XML key format [%s]; expected format is DocumentPath:XPath.", |
| key); |
| } |
| final String documentPath = keys[0]; |
| final String xpath = substringAfter(key, SPLIT_CH); |
| try { |
| return XPathFactory.newInstance().newXPath().evaluate(xpath, |
| new InputSource(Files.newInputStream(Paths.get(documentPath)))); |
| } catch (final Exception e) { |
| throw IllegalArgumentExceptions.format(e, "Error looking up XML document [%s] and XPath [%s].", |
| documentPath, xpath); |
| } |
| } |
| |
| } |