/*
    * 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
    *
    *      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 org.apache.commons.io.input;
  
  import static org.junit.jupiter.api.Assertions.assertSame;
  
  import java.io.IOException;
  import java.io.Reader;
  import java.nio.CharBuffer;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link ProxyReader}.
   */
  class ProxyReaderTest {
  
      /** Custom NullReader implementation. */
      private static final class CustomNullReader extends NullReader {
  
          CustomNullReader(final int len) {
              super(len);
          }
  
          @Override
          public int read(final char[] chars) throws IOException {
              return chars == null ? 0 : super.read(chars);
          }
  
          @Override
          public int read(final char[] chars, final int offset, final int length) throws IOException {
              return chars == null ? 0 : super.read(chars, offset, length);
          }
  
          @Override
          public int read(final CharBuffer target) throws IOException {
              return target == null ? 0 : super.read(target);
          }
      }
  
      /** ProxyReader implementation. */
      private static final class ProxyReaderImpl extends ProxyReader {
  
          ProxyReaderImpl(final Reader proxy) {
              super(proxy);
          }
      }
  
      @Test
      void testNullCharArray() throws Exception {
          try (ProxyReader proxy = new ProxyReaderImpl(new CustomNullReader(0))) {
              proxy.read((char[]) null);
              proxy.read(null, 0, 0);
          }
      }
  
      @Test
      void testNullCharBuffer() throws Exception {
          try (ProxyReader proxy = new ProxyReaderImpl(new CustomNullReader(0))) {
              proxy.read((CharBuffer) null);
          }
      }
  
      @Test
      void testSetReference() throws Exception {
          try (CustomNullReader wrapped = new CustomNullReader(0); ProxyReader proxy = new ProxyReaderImpl(wrapped)) {
              assertSame(wrapped, proxy.unwrap());
              proxy.setReference(NullReader.INSTANCE);
              assertSame(NullReader.INSTANCE, proxy.unwrap());
          }
      }
  
      @Test
      void testUnwrap() throws Exception {
          try (CustomNullReader wrapped = new CustomNullReader(0); ProxyReader proxy = new ProxyReaderImpl(wrapped)) {
              assertSame(wrapped, proxy.unwrap());
          }
      }
  }