001/**
002 * Copyright (c) 2012, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.utils.threads;
031
032/**
033 * CharSequence that noticed thread interrupts -- as might be necessary 
034 * to recover from a loose regex on unexpected challenging input. 
035 * 
036 * @author gojomo
037 */
038public class InterruptibleCharSequence implements CharSequence {
039    CharSequence inner;
040    // public long counter = 0; 
041
042    public InterruptibleCharSequence(CharSequence inner) {
043        super();
044        this.inner = inner;
045    }
046
047    @Override
048        public char charAt(int index) {
049        if (Thread.interrupted()) { // clears flag if set
050            throw new RuntimeException(new InterruptedException());
051        }
052        // counter++;
053        return inner.charAt(index);
054    }
055
056    @Override
057        public int length() {
058        return inner.length();
059    }
060
061    @Override
062        public CharSequence subSequence(int start, int end) {
063        return new InterruptibleCharSequence(inner.subSequence(start, end));
064    }
065
066    @Override
067    public String toString() {
068        return inner.toString();
069    }
070}