Add exists methods for index and cluster and change shortName to alias [moved]

[lvca]

This is Issue 901 moved from a Google Code project.
Added by 2012-06-19T16:20:25.000Z by odbu...@hotmail.com.
Please review that bug for more context and additional comments, but update this bug.

Original labels: Type-Enhancement, Priority-Low

Original description

Requested in the forum:
-----
Can you add a few more convenience methods to check existence of objects?


These already exist:
db.exists()
db.getMetadata().getSchema().existsClass(...)
db.getMetadata().getSchema().getClass(...).existsProperty(...)

These should probably be added for consistency:
db.getMetadata().getIndexManager().existsIndex(...)
db.existsCluster(...)

Also, the method name on OClass and the term "alias" should be unified in the console and java api:
OClass o = ...;
//Instead of:
o.setShortName("thisIsAnAlias");
//Should be:
o.setAlias("thisIsAnAlias");
//So that it matches the output in the console:
Class................: test
Alias................: thisIsAnAlias
Default cluster......: test (id=6)
Supported cluster ids: [6]