Mercurial > dive4elements > framework
annotate artifacts/src/main/java/de/intevation/artifacts/Artifact.java @ 4:13a12b607baf
Added mechanism to create an share a global context in the artifact database.
artifacts/trunk@13 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 04 Sep 2009 08:32:09 +0000 |
parents | 141457e0d7b1 |
children | a5a279a0ee35 |
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1 package de.intevation.artifacts; |
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2 |
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3 import org.w3c.dom.Document; |
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4 |
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5 import java.io.Serializable; |
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6 |
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7 /** |
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8 * Interface of the core component of the artifact system: <strong>The artifact</strong>. |
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9 * <br> |
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10 * |
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11 * An artifact is an abstract data type offering the following methods: |
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12 * |
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13 * <ol> |
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14 * <li>{@link #identifier() identifier()}: Returns a gobally unique identfier |
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15 * of this artifact.</li> |
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16 * <li>{@link #hash() hash()}: Returns a hash value over the internal state |
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17 * of this artifact.</li> |
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18 * <li>{@link #describe(Object)}: Returns a description of this artifact.</li> |
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19 * <li>{@link #advance(Document, Object) advance()}: Advances this artifact |
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20 * to the next internal state</li> |
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21 * <li>{@link #feed(Document, Object) feed()}: Feed new data into this artifact.</li> |
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22 * <li>{@link #out(Document, Object) out()}: Produces output for this artifact.</li> |
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23 * </ol> |
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24 * |
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25 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de) |
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26 */ |
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27 public interface Artifact |
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28 extends Serializable |
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29 { |
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30 /** |
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31 * Identify this artifact. |
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32 * @return Returns unique string to identify this artifact globally. |
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33 */ |
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34 public String identifier(); |
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35 |
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36 /** |
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37 * Internal hash of this artifact. |
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38 * @return Returns hash that should stay the same if the internal |
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39 * value has not changed. Useful for caching |
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40 */ |
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41 public String hash(); |
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42 |
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43 /** |
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44 * A description used to build a interface to interact with this artifact. |
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45 * @param context The global context of the runtime system. |
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46 * @return An XML representation of the current state of the artifact. |
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47 */ |
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48 public Document describe(Object context); |
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49 |
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50 /** |
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51 * Change the internal state of the artifact. |
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52 * @return An XML representation of the success of the advancing. |
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53 * @param target Target of internal state to move to. |
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54 * @param context The global context of the runtime system. |
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55 */ |
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56 public Document advance(Document target, Object context); |
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57 |
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58 /** |
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59 * Feed data into this artifact. |
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60 * @param data Data to feed artifact with. |
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61 * @param context The global context of the runtime system. |
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62 * @return An XML representation of the success of the feeding. |
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63 */ |
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64 public Document feed(Document data, Object context); |
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65 |
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66 /** |
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67 * Produce output from this artifact. |
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68 * @param format Specifies the format of the output. |
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69 * @param context The global context of the runtime system. |
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70 * @return a byte representation of the output. |
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71 */ |
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72 public byte [] out(Document format, Object context); |
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73 } |
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74 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |