/*
    * 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.commons.io.input;
  
  import java.io.FilterReader;
  import java.io.IOException;
  import java.io.Reader;
  import java.io.UncheckedIOException;
  import java.nio.CharBuffer;
  
  import org.apache.commons.io.build.AbstractStreamBuilder;
  import org.apache.commons.io.function.Uncheck;
  
  /**
   * A {@link FilterReader} that throws {@link UncheckedIOException} instead of {@link IOException}.
   * <p>
   * To build an instance, use {@link Builder}.
   * </p>
   *
   * @see Builder
   * @see FilterReader
   * @see IOException
   * @see UncheckedIOException
   * @since 2.12.0
   */
  public final class UncheckedFilterReader extends FilterReader {
  
      // @formatter:off
      /**
       * Builds a new {@link UncheckedFilterReader}.
       *
       * <p>
       * Using File IO:
       * </p>
       * <pre>{@code
       * UncheckedFilterReader s = UncheckedFilterReader.builder()
       *   .setFile(file)
       *   .get();}
       * </pre>
       * <p>
       * Using NIO Path:
       * </p>
       * <pre>{@code
       * UncheckedFilterReader s = UncheckedFilterReader.builder()
       *   .setPath(path)
       *   .get();}
       * </pre>
       *
       * @see #get()
       */
      // @formatter:on
      public static class Builder extends AbstractStreamBuilder<UncheckedFilterReader, Builder> {
  
          /**
           * Builds a new {@link UncheckedFilterReader}.
           * <p>
           * You must set input that supports {@link #getReader()} on this builder, otherwise, this method throws an exception.
           * </p>
           * <p>
           * This builder use the following aspects:
           * </p>
           * <ul>
           * <li>{@link #getReader()}</li>
           * </ul>
           *
           * @return a new instance.
           * @throws UnsupportedOperationException if the origin cannot provide a Reader.
           * @throws IllegalStateException if the {@code origin} is {@code null}.
           * @see #getReader()
           */
          @Override
          public UncheckedFilterReader get() {
              // This an unchecked class, so this method is as well.
              return Uncheck.get(() -> new UncheckedFilterReader(getReader()));
          }
  
      }
  
      /**
       * Constructs a new {@link Builder}.
       *
       * @return a new {@link Builder}.
       */
      public static Builder builder() {
         return new Builder();
     }
 
     /**
      * Constructs a new filtered reader.
      *
      * @param reader a Reader object providing the underlying stream.
      * @throws NullPointerException if {@code reader} is {@code null}.
      */
     private UncheckedFilterReader(final Reader reader) {
         super(reader);
     }
 
     /**
      * Calls this method's super and rethrow {@link IOException} as {@link UncheckedIOException}.
      */
     @Override
     public void close() throws UncheckedIOException {
         Uncheck.run(super::close);
     }
 
     /**
      * Calls this method's super and rethrow {@link IOException} as {@link UncheckedIOException}.
      */
     @Override
     public void mark(final int readAheadLimit) throws UncheckedIOException {
         Uncheck.accept(super::mark, readAheadLimit);
     }
 
     /**
      * Calls this method's super and rethrow {@link IOException} as {@link UncheckedIOException}.
      */
     @Override
     public int read() throws UncheckedIOException {
         return Uncheck.get(super::read);
     }
 
     /**
      * Calls this method's super and rethrow {@link IOException} as {@link UncheckedIOException}.
      */
     @Override
     public int read(final char[] cbuf) throws UncheckedIOException {
         return Uncheck.apply(super::read, cbuf);
     }
 
     /**
      * Calls this method's super and rethrow {@link IOException} as {@link UncheckedIOException}.
      */
     @Override
     public int read(final char[] cbuf, final int off, final int len) throws UncheckedIOException {
         return Uncheck.apply(super::read, cbuf, off, len);
     }
 
     /**
      * Calls this method's super and rethrow {@link IOException} as {@link UncheckedIOException}.
      */
     @Override
     public int read(final CharBuffer target) throws UncheckedIOException {
         return Uncheck.apply(super::read, target);
     }
 
     /**
      * Calls this method's super and rethrow {@link IOException} as {@link UncheckedIOException}.
      */
     @Override
     public boolean ready() throws UncheckedIOException {
         return Uncheck.get(super::ready);
     }
 
     /**
      * Calls this method's super and rethrow {@link IOException} as {@link UncheckedIOException}.
      */
     @Override
     public void reset() throws UncheckedIOException {
         Uncheck.run(super::reset);
     }
 
     /**
      * Calls this method's super and rethrow {@link IOException} as {@link UncheckedIOException}.
      */
     @Override
     public long skip(final long n) throws UncheckedIOException {
         return Uncheck.apply(super::skip, n);
     }
 
 }