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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;

/**
 * Looks up keys from an XML document.
 * 

* Looks up the value for a given key in the format "Charset:Path". *

*

* For example: "UTF-8:com/domain/document.properties". *

* * @since 1.5 */ final class FileStringLookup extends AbstractStringLookup { /** * Defines the singleton for this class. */ static final AbstractStringLookup INSTANCE = new FileStringLookup(); /** * No need to build instances for now. */ private FileStringLookup() { // 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(String.valueOf(SPLIT_CH)); final int keyLen = keys.length; if (keyLen < 2) { throw IllegalArgumentExceptions .format("Bad file key format [%s], expected format is CharsetName:DocumentPath.", key); } final String charsetName = keys[0]; final String fileName = substringAfter(key, SPLIT_CH); try { return new String(Files.readAllBytes(Paths.get(fileName)), charsetName); } catch (final Exception e) { throw IllegalArgumentExceptions.format(e, "Error looking up file [%s] with charset [%s].", fileName, charsetName); } } }




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