| /* |
| * 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.lucene.analysis; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.util.Random; |
| |
| import org.apache.lucene.util.TestUtil; |
| |
| /** Wraps a Reader, and can throw random or fixed |
| * exceptions, and spoon feed read chars. */ |
| |
| public class MockReaderWrapper extends Reader { |
| |
| private final Reader in; |
| private final Random random; |
| |
| private int excAtChar = -1; |
| private int readSoFar; |
| private boolean throwExcNext; |
| |
| public MockReaderWrapper(Random random, Reader in) { |
| this.in = in; |
| this.random = random; |
| } |
| |
| /** Throw an exception after reading this many chars. */ |
| public void throwExcAfterChar(int charUpto) { |
| excAtChar = charUpto; |
| // You should only call this on init!: |
| assert readSoFar == 0; |
| } |
| |
| public void throwExcNext() { |
| throwExcNext = true; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| in.close(); |
| } |
| |
| @Override |
| public int read(char[] cbuf, int off, int len) throws IOException { |
| if (throwExcNext || (excAtChar != -1 && readSoFar >= excAtChar)) { |
| throw new RuntimeException("fake exception now!"); |
| } |
| final int read; |
| final int realLen; |
| if (len == 1) { |
| realLen = 1; |
| } else { |
| // Spoon-feed: intentionally maybe return less than |
| // the consumer asked for |
| realLen = TestUtil.nextInt(random, 1, len); |
| } |
| if (excAtChar != -1) { |
| final int left = excAtChar - readSoFar; |
| assert left != 0; |
| read = in.read(cbuf, off, Math.min(realLen, left)); |
| assert read != -1; |
| readSoFar += read; |
| } else { |
| read = in.read(cbuf, off, realLen); |
| } |
| return read; |
| } |
| |
| @Override |
| public boolean markSupported() { |
| return false; |
| } |
| |
| @Override |
| public boolean ready() { |
| return false; |
| } |
| |
| public static boolean isMyEvilException(Throwable t) { |
| return (t instanceof RuntimeException) && "fake exception now!".equals(t.getMessage()); |
| } |
| }; |