Could someone explain the objects and tables. I really don not understand the problem
domain. How is vertex used here - math (The point at which the sides of an angle
intersect), Astronomy (The highest point reached in the apparent motion of a celestial
body), or Anatomy (The highest point of the skull)? None of these jive with "sink" or
"source." Also, why does the edge table below need foreign keys to vertex?
Thanks much,
----------------------------------------------------------------- TABLES
create table vertex (
creationDate DATE,
name VARCHAR(50) not null unique,
strength FLOAT,
version_number INTEGER not null,
vertex_id BIGINT not null,
vertex_type VARCHAR(255) not null,
primary key (vertex_id))
create table edge (
creationDate DATE,
edge_cpcty FLOAT,
edge_id BIGINT not null,
edge_length FLOAT,
name VARCHAR(50) not null unique,
sink BIGINT not null,
source BIGINT not null,
primary key (edge_id))
alter table edge add constraint
edgeFK1 foreign key (sink) references vertex
alter table edge add constraint
edgeFK0 foreign key (source) references vertex
create table hibernate_unique_key ( next_hi INTEGER )
insert into hibernate_unique_key values ( 0 )
-----------------------------------------------------------------
----------------------------------------------------------------- Classes
public class Edge {
private float length;
private String name;
private float capacity;
private Vertex source;
private Vertex sink;
private long key;
private Date creationDate = new Date();
}
public class Vertex {
private Set incoming = new HashSet();
private Set outgoing = new HashSet();
private String name;
private long key;
private int version;
private Date creationDate = new Date();
}
public class Source extends Vertex {
private float strength;
}
-----------------------------------------------------------------
Jeff Boring
Custom & Web Services Development
AT&T Labs
[EMAIL PROTECTED]
(813) 878-3367
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