Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/fixings/FixingsFacet.java @ 4442:26774405c884
Introduce a new FixingsFacet to add save access to the current Km
Values which are accessed by a String like a map must be checked for null. The
new FixingsFacet adds a getCurrentKm method that abstracts the direct access to
the CallContext and always returns a valid double value.
| author | Björn Ricks <bjoern.ricks@intevation.de> |
|---|---|
| date | Wed, 07 Nov 2012 14:06:03 +0100 |
| parents | |
| children | b195fede1c3b |
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| 4441:093f9333f66b | 4442:26774405c884 |
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| 1 package de.intevation.flys.artifacts.model.fixings; | |
| 2 | |
| 3 import de.intevation.artifacts.CallContext; | |
| 4 import de.intevation.flys.artifacts.model.DataFacet; | |
| 5 import de.intevation.flys.artifacts.states.DefaultState.ComputeType; | |
| 6 | |
| 7 /** | |
| 8 * Facet to access the current Km from the context safely | |
| 9 * | |
| 10 * @author <a href="mailto:bjoern.ricks@intevation.de">Björn Ricks</a> | |
| 11 */ | |
| 12 public class FixingsFacet extends DataFacet { | |
| 13 | |
| 14 public static final Double INVALID_KM = Double.valueOf(-1d); | |
| 15 public static final String CURRENT_KM = "currentKm"; | |
| 16 | |
| 17 public FixingsFacet() { | |
| 18 } | |
| 19 | |
| 20 public FixingsFacet(String name, String description) { | |
| 21 super(0, name, description, ComputeType.ADVANCE, null, null); | |
| 22 } | |
| 23 | |
| 24 public FixingsFacet( | |
| 25 int index, | |
| 26 String name, | |
| 27 String description, | |
| 28 ComputeType type, | |
| 29 String hash, | |
| 30 String stateId | |
| 31 ) { | |
| 32 super(index, name, description, type, hash, stateId); | |
| 33 } | |
| 34 | |
| 35 /** | |
| 36 * Returns the current km from the context. | |
| 37 * If the context is null or doesn't contain a currentKm then a double value of -1 will | |
| 38 * be returned. | |
| 39 * @param context The CallContext instance | |
| 40 * @return the current km as double | |
| 41 */ | |
| 42 protected double getCurrentKm(CallContext context) { | |
| 43 if (context == null) { | |
| 44 return INVALID_KM; | |
| 45 } | |
| 46 Double dkm = (Double)context.getContextValue(CURRENT_KM); | |
| 47 if (dkm == null) { | |
| 48 return INVALID_KM; | |
| 49 } | |
| 50 return dkm.doubleValue(); | |
| 51 } | |
| 52 } |