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OPENJPA-340: Unique names are unique. 

git-svn-id: https://svn.apache.org/repos/asf/openjpa/trunk@672960 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Pinaki Poddar 2008-07-01 00:02:11 +00:00
parent d52998d074
commit 54d1a24320
1 changed files with 31 additions and 30 deletions
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61
openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/schema/Unique.java
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@ -32,8 +32,8 @@ public class Unique
/** /**
* Default constructor without a name. * Default constructor without a name.
* Assumes that this constraint will set its own name automatically from * Implies that this constraint will auto-generate its name from the names
* the names of the columns added to it. * of its columns, unless later the name is set explicitly.
*/ */
public Unique() { public Unique() {
_autoNaming = true; _autoNaming = true;
@ -41,7 +41,7 @@ public class Unique
/** /**
* Construct with given name. * Construct with given name.
* Assumes that this constraint will not set its own name. * Implies that this constraint will not auto-generate its name.
* *
* @param name the name of the constraint, if any * @param name the name of the constraint, if any
* @param table the table of the constraint * @param table the table of the constraint
@ -60,36 +60,10 @@ public class Unique
* The added column is set to non-nullable because a unique constraint * The added column is set to non-nullable because a unique constraint
* on the database requires that its constituent columns are NOT NULL. * on the database requires that its constituent columns are NOT NULL.
* @see Column#setNotNull(boolean) * @see Column#setNotNull(boolean)
* If this instance is constructing its own name, then this method also
* has the side effect of changing its own name by appending the newly
* added column name to its own name.
*/ */
public void addColumn(Column col) { public void addColumn(Column col) {
super.addColumn(col); super.addColumn(col);
col.setNotNull(true); col.setNotNull(true);
if (_autoNaming && getTable() == null) {
String prefix = createPrefix();
setName(prefix + "_" + chop(col.getName(), 4));
_autoNaming = true;
}
}
private String createPrefix() {
String currentName = getName();
if (StringUtils.isEmpty(currentName)) {
String tname = getTableName();
if (StringUtils.isEmpty(tname))
return "UNQ";
else
return "UNQ_" + chop(tname, 3);
}
return currentName;
}
private String chop(String name, int head) {
if (StringUtils.isEmpty(name))
return name;
return name.substring(0, Math.min(Math.max(1,head), name.length()));
} }
/** /**
@ -102,7 +76,19 @@ public class Unique
super.setName(name); super.setName(name);
_autoNaming = false; _autoNaming = false;
} }
/**
* Gets the name of the constraint. If no name has been set by the user
* then this method has the side-effect of auto-generating a name from
* the name of its columns.
*/
public String getName() {
if (getTable() == null && _autoNaming) {
setName(createAutoName());
_autoNaming = true;
}
return super.getName();
}
/** /**
* Return true if the structure of this primary key matches that of * Return true if the structure of this primary key matches that of
@ -120,4 +106,19 @@ public class Unique
public boolean isAutoNaming() { public boolean isAutoNaming() {
return _autoNaming; return _autoNaming;
} }
private String createAutoName() {
Column[] columns = getColumns();
int l = 32/Math.max(columns.length,1);
StringBuffer autoName = new StringBuffer("UNQ_");
for (Column column : columns)
autoName.append(chop(column.getName(),l));
return autoName.toString();
}
private String chop(String name, int head) {
if (StringUtils.isEmpty(name))
return name;
return name.substring(0, Math.min(Math.max(1,head), name.length()));
}
} }