Mig-infocom MiG Calendar DBConnect Guide Manual de usuario descargar pdf (Pagina 24)

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// Keys normally created somewhere else

static final PropertyKey MY_KEY = PropertyKey.getKey("myKey");

static final PropertyKey MY_KEY_TMP1 = PropertyKey.getKey("myKey_tmp1");

static final PropertyKey MY_KEY_TMP2 = PropertyKey.getKey("myKey_tmp2");

// The mappings that goes in the PropertyMappingList

new SimplePropertyMapping("my_col_1", MY_KEY, MY_KEY_TMP1,

PropertyMapping.MTYPE_GENERIC, PropertyMapping.INTEGER_NOT_NULL ) {

public Object getColumnValueToStorage(PropertyConsumer pc)

{

return ((MyComplexType) pc.getProperty(MY_KEY)).getFirstInt();

}

new SimplePropertyMapping("my_col_2", MY_KEY, MY_KEY_TMP2,

PropertyMapping.MTYPE_GENERIC, PropertyMapping.INTEGER_NOT_NULL) {

public Object getColumnValueToStorage(PropertyConsumer pc)

{

return ((MyComplexType) pc.getProperty(MY_KEY)).getSecondInt();

}

The reason the property can't be read back into the correct property at

once is that the mapping is for one field in the backing store and when

read you only have one of the Integers at a time. This makes it

impossible to create the object from one PropertyMapping.

To create the final property you add a Resolver into the

PropertyMappingList.

Resolver.resolve(PropertyConsumer) is called when all

properties has been read into the PropertyConsumer. All you

have to do is to remove the temporary properties your property

mappings created and create the real property with them. Something

like this:

class MyComplexResolver implements Resolver

{

private static final PropertyKey MY_KEY = PropertyKey.getKey("myKey");

private static final PropertyKey MY_KEY_TMP1 = PropertyKey.getKey("myKey_tmp1");

private static final PropertyKey MY_KEY_TMP2 = PropertyKey.getKey("myKey_tmp2");

public void resolve(PropertyConsumer pc)

{

Integer int1 = (Integer) pc.removePropertySilent(MY_KEY_TMP1, Boolean.FALSE);

Integer int2 = (Integer) pc.removePropertySilent(MY_KEY_TMP1, Boolean.FALSE);

if (int1 != null && int2 != null)

pc.setPropertySilent(MY_KEY, new MyComplexType(int1, int2), Boolean.FALSE);

}

Then just add that resolver to the PropertyMappingList that

you added the SimplePropertyMappings you created.

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