antville/helma
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made localField and remoteField protected

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hns 2001-01-25 20:56:47 +00:00
parent 46a17c3028
commit d807e4a340
1 changed files with 19 additions and 5 deletions
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24
src/helma/objectmodel/Relation.java
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@ -23,7 +23,7 @@ public class Relation {
public DbMapping home;
public DbMapping other;
public String propname;
public String localField, remoteField;
protected String localField, remoteField;
public int direction;
public boolean virtual;
@ -164,8 +164,11 @@ public class Relation {
}
public boolean usesPrimaryKey () {
if (remoteField == null || other == null)
if (other == null)
return false;
if (remoteField == null)
// if remote field is null, it is assumed that it points to the primary key
return true;
return remoteField.equalsIgnoreCase (other.getIDField());
}
@ -192,19 +195,30 @@ public class Relation {
}
/**
* Get the local column name for this relation. Uses the home node's id as fallback if local field is not specified.
* Get the local column name for this relation to use in where clauses of select statements.
* This uses the home node's id as fallback if local field is not specified.
*/
public String getLocalField () {
if (localField == null)
// only assume local field is primary key if other objects "point" to this object
if (localField == null && direction == BACKWARD)
return home.getIDField ();
return localField;
}
/**
* Return the local field name for updates. This is the same as getLocalField, but does not return the
* primary key name as a fallback.
*/
public String getDbField () {
return localField;
}
/**
* Get the "remote" column name for this relation. Uses the remote node's id as fallback if the remote field is not specified.
*/
public String getRemoteField () {
if (remoteField == null)
// only assume remote field is primary key if this relation "points" to an object
if (remoteField == null && direction == FORWARD)
return other.getIDField ();
return remoteField;
}