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1 /*
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2 * ConnectBot: simple, powerful, open-source SSH client for Android
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3 * Copyright 2007 Kenny Root, Jeffrey Sharkey
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4 *
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5 * Licensed under the Apache License, Version 2.0 (the "License");
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6 * you may not use this file except in compliance with the License.
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7 * You may obtain a copy of the License at
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8 *
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9 * http://www.apache.org/licenses/LICENSE-2.0
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10 *
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11 * Unless required by applicable law or agreed to in writing, software
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12 * distributed under the License is distributed on an "AS IS" BASIS,
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13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 * See the License for the specific language governing permissions and
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15 * limitations under the License.
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16 */
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17
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18 package com.trilead.ssh2.compression;
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19
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20 import java.util.Vector;
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21
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22 /**
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23 * @author Kenny Root
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24 *
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25 */
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26 public class CompressionFactory {
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27 static class CompressorEntry {
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28 String type;
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29 String compressorClass;
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30
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31 public CompressorEntry(String type, String compressorClass) {
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32 this.type = type;
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33 this.compressorClass = compressorClass;
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34 }
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35 }
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36
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37 static Vector<CompressorEntry> compressors = new Vector<CompressorEntry>();
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38
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39 static {
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40 /* Higher Priority First */
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41 compressors.addElement(new CompressorEntry("zlib", "com.trilead.ssh2.compression.Zlib"));
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42 compressors.addElement(new CompressorEntry("zlib@openssh.com", "com.trilead.ssh2.compression.ZlibOpenSSH"));
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43 compressors.addElement(new CompressorEntry("none", ""));
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44 }
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45
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46 public static String[] getDefaultCompressorList() {
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47 String list[] = new String[compressors.size()];
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48
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49 for (int i = 0; i < compressors.size(); i++) {
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50 CompressorEntry ce = compressors.elementAt(i);
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51 list[i] = new String(ce.type);
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52 }
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53
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54 return list;
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55 }
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56
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57 public static void checkCompressorList(String[] compressorCandidates) {
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58 for (int i = 0; i < compressorCandidates.length; i++)
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59 getEntry(compressorCandidates[i]);
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60 }
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61
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62 public static ICompressor createCompressor(String type) {
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63 try {
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64 CompressorEntry ce = getEntry(type);
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65
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66 if ("".equals(ce.compressorClass))
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67 return null;
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68
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69 Class<?> cc = Class.forName(ce.compressorClass);
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70 ICompressor cmp = (ICompressor) cc.newInstance();
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71 return cmp;
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72 }
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73 catch (Exception e) {
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74 throw new IllegalArgumentException("Cannot instantiate " + type);
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75 }
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76 }
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77
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78 private static CompressorEntry getEntry(String type) {
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79 for (int i = 0; i < compressors.size(); i++) {
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80 CompressorEntry ce = compressors.elementAt(i);
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81
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82 if (ce.type.equals(type))
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83 return ce;
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84 }
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85
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86 throw new IllegalArgumentException("Unkown algorithm " + type);
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87 }
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88 }
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