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/*-
* ============LICENSE_START=======================================================
* ONAP POLICY-CLAMP
* ================================================================================
* Copyright (C) 2017, 2021 AT&T Intellectual Property. All rights
* reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END============================================
* ===================================================================
*
*/
package org.onap.policy.clamp.clds.util;
import java.io.IOException;
import java.io.InputStream;
import java.util.Scanner;
/**
* Utility methods supporting resources accesses.
*/
public final class ResourceFileUtils {
/**
* getResourceAsStram supports the "file:" prefix as they use URL.
* So here we want to eliminate classpath: prefix, so that this class can get
* files from jar resource or file system.
*/
private static final String CLASSPATH_PREFIX = "classpath:";
/**
* Private constructor to avoid creating instances of util class.
*/
private ResourceFileUtils() {
}
/**
* Method to access a file from the jar resource folder or file system.
* Give the prefix "classpath:" so that it accesses the jar resource folder (default case)
* or the prefix "file:" so that it accesses the file system.
*
* @param fileName The path of the resource (no prefix it will be a classpath access,
* "classpath:/myfilename" or "file:/myfilename")
* @return The file as inputStream
*/
public static InputStream getResourceAsStream(String fileName) {
InputStream is = Thread.currentThread().getContextClassLoader()
.getResourceAsStream(fileName.replaceFirst("^" + CLASSPATH_PREFIX, ""));
if (is == null) {
throw new IllegalArgumentException("Unable to find resource: " + fileName);
}
return is;
}
/**
* Method to access a resource file as a string.
* Give the prefix "classpath:" so that it accesses the jar resource folder (default case)
* or the prefix "file:" so that it accesses the file system.
*
* @param fileName The path of the resource (no prefix it will be a classpath access,
* "classpath:/myfilename" or "file:/myfilename")
* @return The file as String
* @throws IOException In case of failure to find the file.
*/
public static String getResourceAsString(String fileName) throws IOException {
try (InputStream is = getResourceAsStream(fileName)) {
return streamToString(is);
}
}
private static String streamToString(InputStream inputStream) {
try (Scanner scanner = new Scanner(inputStream)) {
Scanner delimitedScanner = scanner.useDelimiter("\\A");
return delimitedScanner.hasNext() ? delimitedScanner.next() : "";
}
}
}
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