Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/DataCage.java @ 950:22bc87a42a0d
First step to factor out the "Datenkorb" logic into a service independent singleton.
flys-artifacts/trunk@2367 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Wed, 20 Jul 2011 09:56:39 +0000 |
| parents | |
| children | 92027887775a |
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| 949:ea56940bfc4c | 950:22bc87a42a0d |
|---|---|
| 1 package de.intevation.flys.artifacts.services.meta; | |
| 2 | |
| 3 import java.io.InputStream; | |
| 4 import java.io.IOException; | |
| 5 import java.io.File; | |
| 6 | |
| 7 import java.io.FileInputStream; | |
| 8 | |
| 9 import org.apache.log4j.Logger; | |
| 10 | |
| 11 import org.w3c.dom.Document; | |
| 12 | |
| 13 import de.intevation.artifacts.common.utils.Config; | |
| 14 import de.intevation.artifacts.common.utils.XMLUtils; | |
| 15 | |
| 16 public class DataCage | |
| 17 { | |
| 18 private static Logger log = Logger.getLogger(DataCage.class); | |
| 19 | |
| 20 public static final String XPATH_META_DATA_TEMPLATE = | |
| 21 "/artifact-database/metadata/@template"; | |
| 22 | |
| 23 private static DataCage INSTANCE; | |
| 24 | |
| 25 protected Builder builder; | |
| 26 | |
| 27 public DataCage() { | |
| 28 } | |
| 29 | |
| 30 public DataCage(Builder builder) { | |
| 31 this.builder = builder; | |
| 32 } | |
| 33 | |
| 34 public Builder getBuilder() { | |
| 35 return builder; | |
| 36 } | |
| 37 | |
| 38 public static synchronized DataCage getInstance() { | |
| 39 if (INSTANCE == null) { | |
| 40 INSTANCE = createDataCage(); | |
| 41 } | |
| 42 return INSTANCE; | |
| 43 } | |
| 44 | |
| 45 protected static Builder createBuilder(File file) { | |
| 46 log.debug("DataCage.createBuilder"); | |
| 47 | |
| 48 if (!file.isFile() || !file.canRead()) { | |
| 49 log.error("Cannot open template file '" + file + "'"); | |
| 50 return null; | |
| 51 } | |
| 52 | |
| 53 InputStream in = null; | |
| 54 | |
| 55 try { | |
| 56 in = new FileInputStream(file); | |
| 57 | |
| 58 Document template = XMLUtils.parseDocument(in); | |
| 59 | |
| 60 if (template == null) { | |
| 61 log.error("cannot parse meta data template"); | |
| 62 } | |
| 63 else { | |
| 64 return new Builder(template); | |
| 65 } | |
| 66 } | |
| 67 catch (IOException ioe) { | |
| 68 log.error(ioe); | |
| 69 } | |
| 70 finally { | |
| 71 if (in != null) { | |
| 72 try { | |
| 73 in.close(); | |
| 74 } | |
| 75 catch (IOException ioe) { | |
| 76 log.error(ioe); | |
| 77 } | |
| 78 } | |
| 79 } | |
| 80 return null; | |
| 81 } | |
| 82 | |
| 83 protected static DataCage createDataCage() { | |
| 84 log.debug("DataCage.createDataCage"); | |
| 85 | |
| 86 String path = Config.getStringXPath(XPATH_META_DATA_TEMPLATE); | |
| 87 if (path == null) { | |
| 88 log.error("no path to template file given"); | |
| 89 return null; | |
| 90 } | |
| 91 | |
| 92 path = Config.replaceConfigDir(path); | |
| 93 | |
| 94 return new DataCage(createBuilder(new File(path))); | |
| 95 } | |
| 96 } | |
| 97 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |