| /* |
| * 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 static org.apache.commons.io.IOUtils.EOF; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| |
| /** |
| * Closed reader. This reader returns EOF to all attempts to read something from it. |
| * <p> |
| * Typically uses of this class include testing for corner cases in methods that accept readers and acting as a sentinel |
| * value instead of a {@code null} reader. |
| * </p> |
| * |
| * @since 2.7 |
| */ |
| public class ClosedReader extends Reader { |
| |
| /** |
| * A singleton. |
| */ |
| public static final ClosedReader CLOSED_READER = new ClosedReader(); |
| |
| /** |
| * Returns -1 to indicate that the stream is closed. |
| * |
| * @param cbuf ignored |
| * @param off ignored |
| * @param len ignored |
| * @return always -1 |
| */ |
| @Override |
| public int read(final char[] cbuf, final int off, final int len) { |
| return EOF; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| // noop |
| } |
| |
| } |