Mercurial > dive4elements > framework
comparison artifact-database/src/main/java/de/intevation/artifactdatabase/AbstractCallContext.java @ 362:5b6ba54d488a
Never return null from a function which is documented to do so.
artifacts/trunk@3443 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
|---|---|
| date | Fri, 16 Dec 2011 14:05:52 +0000 |
| parents | 1d11a0531242 |
| children | 1f51f3c46efe |
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| 361:b47d0464f0db | 362:5b6ba54d488a |
|---|---|
| 5 * Read the file LGPL.txt coming with the software for details | 5 * Read the file LGPL.txt coming with the software for details |
| 6 * or visit http://www.gnu.org/licenses/ if it does not exist. | 6 * or visit http://www.gnu.org/licenses/ if it does not exist. |
| 7 */ | 7 */ |
| 8 package de.intevation.artifactdatabase; | 8 package de.intevation.artifactdatabase; |
| 9 | 9 |
| 10 import org.apache.log4j.Logger; | |
| 11 | |
| 10 import java.util.ArrayList; | 12 import java.util.ArrayList; |
| 11 import java.util.List; | 13 import java.util.List; |
| 14 import java.util.Map; | |
| 12 import java.util.HashMap; | 15 import java.util.HashMap; |
| 13 | 16 |
| 14 import de.intevation.artifacts.ArtifactDatabase; | 17 import de.intevation.artifacts.ArtifactDatabase; |
| 15 import de.intevation.artifacts.CallContext; | 18 import de.intevation.artifacts.CallContext; |
| 16 import de.intevation.artifacts.CallMeta; | 19 import de.intevation.artifacts.CallMeta; |
| 22 * | 25 * |
| 23 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> | 26 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
| 24 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> | 27 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
| 25 */ | 28 */ |
| 26 public abstract class AbstractCallContext implements CallContext { | 29 public abstract class AbstractCallContext implements CallContext { |
| 30 | |
| 31 Logger logger = Logger.getLogger(AbstractCallContext.class); | |
| 27 | 32 |
| 28 /** | 33 /** |
| 29 * The ArtifactDatabase instance. | 34 * The ArtifactDatabase instance. |
| 30 */ | 35 */ |
| 31 protected ArtifactDatabaseImpl database; | 36 protected ArtifactDatabaseImpl database; |
| 113 /** | 118 /** |
| 114 * Get list of DataProviders that registered for given key. | 119 * Get list of DataProviders that registered for given key. |
| 115 * @return list (empty list if none found, never null). | 120 * @return list (empty list if none found, never null). |
| 116 */ | 121 */ |
| 117 public List<DataProvider> getDataProvider(Object key) { | 122 public List<DataProvider> getDataProvider(Object key) { |
| 118 return dataProviders != null | 123 if (dataProviders != null) { |
| 119 ? dataProviders.get(key) | 124 List<DataProvider> list = dataProviders.get(key); |
| 120 : java.util.Collections.<DataProvider>emptyList(); | 125 return list != null |
| 126 ? list | |
| 127 : java.util.Collections.<DataProvider>emptyList(); | |
| 128 } | |
| 129 return java.util.Collections.<DataProvider>emptyList(); | |
| 121 } | 130 } |
| 131 | |
| 122 | 132 |
| 123 /** | 133 /** |
| 124 * Let a DataProvider register itself with given key. | 134 * Let a DataProvider register itself with given key. |
| 125 * Multiple DataProvider can register under the same key. | 135 * Multiple DataProvider can register under the same key. |
| 126 */ | 136 */ |