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annotate src/ch/ethz/ssh2/compression/CompressionFactory.java @ 273:91a31873c42a ganymed

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author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
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children 071eccdff8ea
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1 package ch.ethz.ssh2.compression;
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2
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3 import java.util.ArrayList;
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4 import java.util.List;
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5
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6 /**
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7 * @author Kenny Root
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8 * @version $Id: CompressionFactory.java 156 2014-04-29 12:02:35Z dkocher@sudo.ch $
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9 */
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10 public class CompressionFactory {
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11 static class CompressorEntry {
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12 String type;
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13 String compressorClass;
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14
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15 public CompressorEntry(String type, String compressorClass) {
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16 this.type = type;
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17 this.compressorClass = compressorClass;
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18 }
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19 }
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20
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21 private static final List<CompressorEntry> compressors
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22 = new ArrayList<CompressorEntry>();
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23
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24 static {
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25 // Higher priority first
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26 compressors.add(new CompressorEntry("none", null));
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27 }
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28
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29 public static String[] getDefaultCompressorList() {
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30 String list[] = new String[compressors.size()];
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31 for(int i = 0; i < compressors.size(); i++) {
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32 CompressorEntry ce = compressors.get(i);
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33 list[i] = ce.type;
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34 }
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35 return list;
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36 }
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37
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38 public static void checkCompressorList(String[] list) {
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39 for(final String candidate : list) {
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40 getEntry(candidate);
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41 }
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42 }
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43
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44 public static Compressor createCompressor(String type) {
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45 try {
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46 CompressorEntry ce = getEntry(type);
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47 if(null == ce.compressorClass) {
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48 return null;
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49 }
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50 Class<?> cc = Class.forName(ce.compressorClass);
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51 return (Compressor) cc.newInstance();
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52 }
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53 catch(Exception e) {
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54 throw new IllegalArgumentException("Cannot instantiate " + type);
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55 }
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56 }
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57
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58 private static CompressorEntry getEntry(String type) {
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59 for(CompressorEntry ce : compressors) {
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60 if(ce.type.equals(type)) {
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61 return ce;
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62 }
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63 }
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64 throw new IllegalArgumentException("Unknown algorithm " + type);
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65 }
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66 }