79 lines
2.1 KiB
Markdown
79 lines
2.1 KiB
Markdown
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+++
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title = "innerclasses"
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draft = false
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tags = [
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"code",
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"java",
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"dynamica",
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"innerclasses"
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]
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date = "2013-03-12"
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+++
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# code:java:dynamica >> Innerclasses
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Java is geen dynamische taal maar je kan wel gebruik maken van een aantal handige trucjes om duplicatie te vermijden.
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Bijvoorbeeld om **state bij te houden** en de implementatie zelf in een **inner klasse** te voorzien:
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```java
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private interface CrmEndpointWorker {
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void call(Holder<Status> status, Holder<String> result);
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}
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public CrmImportGatewayAction forCreation() {
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return new CrmImportGatewayAction(Action.CREATE);
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}
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public CrmImportGatewayAction forUpdating() {
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return new CrmImportGatewayAction(Action.UPDATE);
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}
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public CrmImportGatewayAction forDeletion() {
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return new CrmImportGatewayAction(Action.DELETE);
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}
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public CrmImportGatewayAction forDeactivating() {
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return new CrmImportGatewayAction(Action.DEACTIVATE);
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}
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public class CrmImportGatewayAction {
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private final Action actionType;
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public CrmImportGatewayAction(Action actionType) {
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this.actionType = actionType;
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}
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private CrmEndpointWorker accessdeviceAction(final List<Accessdevice> devices) {
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return new CrmEndpointWorker() {
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@Override
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public void call(Holder<Status> status, Holder<String> result) {
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getEndpoint().accessdeviceAction(actionType, new CrmConverter().convertDevices(devices), status, result);
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}
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};
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}
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public String sendAccessdevices(List<Accessdevice> devices) {
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return callCrmEndpoint(accessdeviceAction(devices));
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}
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}
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```
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Wat is hier cool aan?
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In plaats van 4 verschillende methods te voorzien op deze klasse:
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* voor creation
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* voor deletion
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* voor updating
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* voor activating
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Kan je dit nu zo doen:
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```java
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service.forCreation().sendAccessdevices();
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service.forDeletion().sendAccessdevices();
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```
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En de `Enum actionType` is toegankelijk binnen die inner klasse en wordt zo mee doorgegeven naar in dit geval de SOAP Endpoint call.
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Prachtig, toch?
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