flink-kubernetes/src/main/java/org/apache/flink/kubernetes/utils/KubernetesUtils.java

/*
 * 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.flink.kubernetes.utils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * Common utils for Kubernetes.
 */
public class KubernetesUtils {

	public static String getContentFromFile(String filePath) {
		File file = new File(filePath);
		if (file.exists()) {
			StringBuilder content = new StringBuilder();
			String line;
			try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file)))){
				while ((line = reader.readLine()) != null) {
					content.append(line).append(System.lineSeparator());
				}
			} catch (IOException e) {
				throw new RuntimeException("Error read file content.", e);
			}
			return content.toString();
		}
		return null;
	}
}