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The Apache Commons IO library contains utility classes, stream implementations, file filters, file comparators, endian transformation classes, and much more.

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/*
 * 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.IOException;
import java.io.Reader;

/**
 * Broken reader. This reader always throws an {@link IOException} from
 * all the {@link Reader} methods where the exception is declared.
 * 
 * This class is mostly useful for testing error handling in code that uses a
 * reader.
 * 
 *
 * @since 2.7
 */
public class BrokenReader extends Reader {

    /**
     * The exception that is thrown by all methods of this class.
     */
    private final IOException exception;

    /**
     * Creates a new reader that always throws the given exception.
     *
     * @param exception the exception to be thrown
     */
    public BrokenReader(final IOException exception) {
        this.exception = exception;
    }

    /**
     * Creates a new reader that always throws an {@link IOException}
     */
    public BrokenReader() {
        this(new IOException("Broken reader"));
    }

    /**
     * Throws the configured exception.
     *
     * @param cbuf ignored
     * @param off ignored
     * @param len ignored
     * @return nothing
     * @throws IOException always thrown
     */
    @Override
    public int read(final char[] cbuf, final int off, final int len) throws IOException {
        throw exception;
    }

    /**
     * Throws the configured exception.
     *
     * @param n ignored
     * @return nothing
     * @throws IOException always thrown
     */
    @Override
    public long skip(final long n) throws IOException {
        throw exception;
    }

    /**
     * Throws the configured exception.
     *
     * @return nothing
     * @throws IOException always thrown
     */
    @Override
    public boolean ready() throws IOException {
        throw exception;
    }

    /**
     * Throws the configured exception.
     *
     * @param readAheadLimit ignored
     * @throws IOException always thrown
     */
    @Override
    public void mark(final int readAheadLimit) throws IOException {
        throw exception;
    }

    /**
     * Throws the configured exception.
     *
     * @throws IOException always thrown
     */
    @Override
    public synchronized void reset() throws IOException {
        throw exception;
    }

    /**
     * Throws the configured exception.
     *
     * @throws IOException always thrown
     */
    @Override
    public void close() throws IOException {
        throw exception;
    }

}