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annotate src/org/tmatesoft/hg/internal/FilterByteChannel.java @ 157:d5268ca7715b

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Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 09 Mar 2011 05:22:17 +0100
parents 1a7a9a20e1f9
children f2c11fe7f3e9
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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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18
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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 }