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POOrmlite: Use generic as type for id
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9843203
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9979374
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2012-03-23T16:49:34.063
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2012-04-02T15:40:37.557
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I'm using ormlite for database interaction in java. Works fine. Now I want to create a generic entity class. Perhaps I'll start with a bit of code to explain it. AbstractId is something like a base class for all ids: <pre><code>public abstract class AbstractId { public AbstractId(String id) { this.id = id; } public String value() { return this.id; } } </code></pre> Extended to: <pre><code> public class SampleId extends AbstractId { public SampleId(String id) { super(id); } } </code></pre> Now I have a abstract base entity to save some typing ;) <pre><code>public abstract class AbstractEntity<T> { @DatabaseField(id = true, columnName = "id") private T id; @DatabaseField(columnName = "name", canBeNull = false) private String name; public AbstractEntity() { } } </code></pre> which is extended by a sample entity: <pre><code>@DatabaseTable(tableName = "sample") public class SampleEntity<T extends AbstractId> extends AbstractEntity<T> { @DatabaseField(canBeNull = false, columnName = "key") private String otherValue; public SampleEntity() { } } </code></pre> So how can i persist T? The entity instance is created by <pre><code>SampleEntity<SampleId> entity = new SampleEntity<>() // (*) </code></pre> I tried to create a new BaseDataType and setting the DatabaseField to use this as persisterClass: <pre><code>public class AbstractIdPersister extends BaseDataType { public AbstractIdPersister(SqlType sqlType, Class<?>[] classes) { super(sqlType, classes); } @Override public Object parseDefaultString(FieldType fieldType, String defaultStr) throws SQLException { return null; } @Override public Object javaToSqlArg(FieldType fieldType, Object obj) { AbstractId abstractId = (AbstractId) obj; return abstractId.value(); } @Override public Object sqlArgToJava(FieldType fieldType, Object sqlArg, int columnPos) throws SQLException { // HOW DO I GET THE GENERIC TYPE DEFINED ABOVE (*) } @Override public Object resultToSqlArg(FieldType fieldType, DatabaseResults results, int columnPos) throws SQLException { return results.getString(columnPos); } } </code></pre> Didn't work ... of course.. Does anyone has any idea how to solve this problem? Thank you!
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<java><database><generics><ormlite>
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Ormlite: Use generic as type for id
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