/*
    * XML Format Maven Plugin (https://github.com/acegi/xml-format-maven-plugin)
    *
    * Copyright 2011-2025 Acegi Technology Pty Limited.
    *
    * 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
    *
   *      https://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 au.com.acegi.xmlformat;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  
  import static org.hamcrest.CoreMatchers.not;
  import static org.hamcrest.CoreMatchers.nullValue;
  import static org.hamcrest.MatcherAssert.assertThat;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.OutputStream;
  import java.io.OutputStreamWriter;
  import java.io.StringWriter;
  import java.io.Writer;
  import java.nio.file.Files;
  
  /**
   * Utility methods required by the test package.
   */
  final class TestUtil {
  
      private TestUtil() {
      }
  
      static String fileToString(final File in) {
          try (InputStream is = Files.newInputStream(in.toPath())) {
              return streamToString(is);
          } catch (final IOException ex) {
              throw new IllegalStateException(ex);
          }
      }
  
      static InputStream getResource(final String resource) {
          final InputStream in = FormatUtilTest.class.getResourceAsStream(resource);
          assertThat(resource + " not found", in, not(nullValue()));
          return in;
      }
  
      static String streamToString(final InputStream in) {
          final StringWriter sw = new StringWriter();
          final InputStreamReader reader = new InputStreamReader(in, UTF_8);
          final char[] buffer = new char[4_096];
          int n;
          try {
              while (-1 != (n = reader.read(buffer))) {
                  sw.write(buffer, 0, n);
              }
          } catch (final IOException ex) {
              throw new IllegalStateException(ex);
          }
          return sw.toString();
      }
  
      static void stringToFile(final String msg, final File out) {
          try (OutputStream fos = Files.newOutputStream(out.toPath());
                  Writer writer = new OutputStreamWriter(fos, UTF_8)) {
              writer.append(msg);
          } catch (final IOException ex) {
              throw new IllegalStateException(ex);
          }
      }
  
  }