From 8640a6e4b2d50cf2068207b1ddec965c07cec3aa Mon Sep 17 00:00:00 2001 From: liamfallon Date: Thu, 14 Mar 2019 14:24:14 +0000 Subject: Add support for TOSCA JSON Parsing Added a getter to allow the Gson object to be retrieved from a GSON message body handler, useful for testing. Moved the TextFileUtils utility class from APEX utilites to policy common utils Issue-ID: POLICY-1195 Change-Id: I7c8074e8177a90b292c6dfd6e7f0d352063818e7 Signed-off-by: liamfallon --- .../common/utils/resources/TextFileUtils.java | 110 +++++++++++++++++++++ 1 file changed, 110 insertions(+) create mode 100644 utils/src/main/java/org/onap/policy/common/utils/resources/TextFileUtils.java (limited to 'utils/src/main/java/org') diff --git a/utils/src/main/java/org/onap/policy/common/utils/resources/TextFileUtils.java b/utils/src/main/java/org/onap/policy/common/utils/resources/TextFileUtils.java new file mode 100644 index 00000000..5aeacf26 --- /dev/null +++ b/utils/src/main/java/org/onap/policy/common/utils/resources/TextFileUtils.java @@ -0,0 +1,110 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2019 Nordix Foundation. + * ================================================================================ + * 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. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.common.utils.resources; + +import java.io.File; +import java.io.IOException; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.io.Reader; +import java.nio.file.Files; + +/** + * The Class TextFileUtils is class that provides useful functions for handling text files. Functions to read and write + * text files to strings and strings are provided. + * + * @author Liam Fallon (liam.fallon@est.tech) + */ +public abstract class TextFileUtils { + private static final String UTF_8 = "UTF-8"; + private static final int READER_CHAR_BUFFER_SIZE_4096 = 4096; + + private TextFileUtils() { + // This class cannot be initialized + } + + /** + * Method to return the contents of a text file as a string. + * + * @param textFilePath The path to the file as a string + * @return A string containing the contents of the file + * @throws IOException on errors reading text from the file + */ + public static String getTextFileAsString(final String textFilePath) throws IOException { + final File textFile = new File(textFilePath); + return new String(Files.readAllBytes(textFile.toPath()), UTF_8); + } + + /** + * Method to write contents of a string to a text file. + * + * @param outString The string to write + * @param textFilePath The path to the file as a string + * @throws IOException on errors reading text from the file + */ + public static void putStringAsTextFile(final String outString, final String textFilePath) throws IOException { + final File textFile = new File(textFilePath); + putStringAsFile(outString, textFile); + } + + /** + * Method to write contents of a string to a text file. + * + * @param outString The string to write + * @param textFile The file to write the string to + * @throws IOException on errors reading text from the file + */ + public static void putStringAsFile(final String outString, final File textFile) throws IOException { + Files.write(textFile.toPath(), outString.getBytes(UTF_8)); + } + + /** + * Method to return the contents of a text steam as a string. + * + * @param textStream The stream + * @return A string containing the output of the stream as text + * @throws IOException on errors reading text from the file + */ + public static String getStreamAsString(final InputStream textStream) throws IOException { + return getReaderAsString(new InputStreamReader(textStream, UTF_8)); + } + + /** + * Method to return the contents of a reader steam as a string. This closes the reader after use + * + * @param textReader The reader + * @return A string containing the output of the reader as text + * @throws IOException on errors reading text from the file + */ + public static String getReaderAsString(final Reader textReader) throws IOException { + final StringBuilder builder = new StringBuilder(); + int charsRead = -1; + final char[] chars = new char[READER_CHAR_BUFFER_SIZE_4096]; + do { + charsRead = textReader.read(chars); + if (charsRead > 0) { + builder.append(chars, 0, charsRead); + } + } + while (charsRead > 0); + return builder.toString(); + } +} -- cgit 1.2.3-korg