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annotate src/org/tmatesoft/hg/internal/FilterByteChannel.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents d5268ca7715b
children f2c11fe7f3e9
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import java.io.IOException;
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20 import java.nio.ByteBuffer;
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21 import java.util.Collection;
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23 import org.tmatesoft.hg.util.Adaptable;
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24 import org.tmatesoft.hg.util.ByteChannel;
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25 import org.tmatesoft.hg.util.CancelledException;
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27 /**
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 public class FilterByteChannel implements ByteChannel, Adaptable {
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33 private final Filter[] filters;
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34 private final ByteChannel delegate;
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35
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36 public FilterByteChannel(ByteChannel delegateChannel, Collection<Filter> filtersToApply) {
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37 if (delegateChannel == null || filtersToApply == null) {
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38 throw new IllegalArgumentException();
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39 }
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40 delegate = delegateChannel;
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41 filters = filtersToApply.toArray(new Filter[filtersToApply.size()]);
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42 }
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44 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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45 final int srcPos = buffer.position();
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46 ByteBuffer processed = buffer;
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47 for (Filter f : filters) {
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48 // each next filter consumes not more than previous
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49 // hence total consumed equals position shift in the original buffer
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50 processed = f.filter(processed);
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51 }
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52 delegate.write(processed);
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53 return buffer.position() - srcPos; // consumed as much from original buffer
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54 }
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56 // adapters or implemented interfaces of the original class shall not be obfuscated by filter
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57 public <T> T getAdapter(Class<T> adapterClass) {
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58 if (delegate instanceof Adaptable) {
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59 return ((Adaptable) delegate).getAdapter(adapterClass);
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60 }
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61 if (adapterClass != null && adapterClass.isInstance(delegate)) {
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62 return adapterClass.cast(delegate);
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63 }
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64 return null;
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65 }
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66 }