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/*
 * 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.
 * 

* Looks up the value for a given key in the format "Document:XPath". *

*

* For example: "com/domain/document.xml:/path/to/node". *

* * @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". *

* For example: "com/domain/document.xml:/path/to/node". *

* * @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); } } }




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