| /* |
| * 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.io.InputStream; |
| import java.nio.file.Files; |
| import java.nio.file.Paths; |
| import java.util.Properties; |
| |
| /** |
| * Looks up keys from an XML document. |
| * <p> |
| * Looks up the value for a given key in the format "Document::Key". |
| * </p> |
| * <p> |
| * Note the use of "::" instead of ":" to allow for "C:" drive letters in paths. |
| * </p> |
| * <p> |
| * For example: "com/domain/document.properties:key". |
| * </p> |
| * |
| * @since 1.5 |
| */ |
| final class PropertiesStringLookup extends AbstractStringLookup { |
| |
| /** |
| * Defines the singleton for this class. |
| */ |
| static final PropertiesStringLookup INSTANCE = new PropertiesStringLookup(); |
| |
| /** |
| * No need to build instances for now. |
| */ |
| private PropertiesStringLookup() { |
| // empty |
| } |
| |
| /** |
| * Looks up the value for the key in the format "DocumentPath:XPath". |
| * <p> |
| * For example: "com/domain/document.xml::/path/to/node". |
| * </p> |
| * <p> |
| * Note the use of "::" instead of ":" to allow for "C:" drive letters in paths. |
| * </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("::"); |
| final int keyLen = keys.length; |
| if (keyLen < 2) { |
| throw IllegalArgumentExceptions |
| .format("Bad properties key format [%s]; expected format is DocumentPath::Key.", key); |
| } |
| final String documentPath = keys[0]; |
| final String propertyKey = substringAfter(key, "::"); |
| try { |
| final Properties properties = new Properties(); |
| try (InputStream inputStream = Files.newInputStream(Paths.get(documentPath))) { |
| properties.load(inputStream); |
| } |
| return properties.getProperty(propertyKey); |
| } catch (final Exception e) { |
| throw IllegalArgumentExceptions.format(e, "Error looking up properties [%s] and key [%s].", documentPath, |
| propertyKey); |
| } |
| } |
| |
| } |