//$Id: TypeNames.java 6254 2005-03-30 18:01:41Z oneovthafew $
package org.hibernate.dialect;
import java.util.Map;
import java.util.HashMap;
import java.util.TreeMap;
import java.util.Iterator;
import org.hibernate.MappingException;
import org.hibernate.util.StringHelper;
/**
* This class maps a type to names. Associations
* may be marked with a capacity. Calling the get()
* method with a type and actual size n will return
* the associated name with smallest capacity >= n,
* if available and an unmarked default type otherwise.
* Eg, setting
* <pre>
* names.put(type, "TEXT" );
* names.put(type, 255, "VARCHAR($l)" );
* names.put(type, 65534, "LONGVARCHAR($l)" );
* </pre>
* will give you back the following:
* <pre>
* names.get(type) // --> "TEXT" (default)
* names.get(type, 100) // --> "VARCHAR(100)" (100 is in [0:255])
* names.get(type, 1000) // --> "LONGVARCHAR(1000)" (1000 is in [256:65534])
* names.get(type, 100000) // --> "TEXT" (default)
* </pre>
* On the other hand, simply putting
* <pre>
* names.put(type, "VARCHAR($l)" );
* </pre>
* would result in
* <pre>
* names.get(type) // --> "VARCHAR($l)" (will cause trouble)
* names.get(type, 100) // --> "VARCHAR(100)"
* names.get(type, 10000) // --> "VARCHAR(10000)"
* </pre>
*
* @author Christoph Beck
*/
public class TypeNames {
private HashMap weighted = new HashMap();
private HashMap defaults = new HashMap();
/**
* get default type name for specified type
* @param typecode the type key
* @return the default type name associated with specified key
*/
public String get(int typecode) throws MappingException {
String result = (String) defaults.get( new Integer(typecode) );
if (result==null) throw new MappingException("No Dialect mapping for JDBC type: " + typecode);
return result;
}
/**
* get type name for specified type and size
* @param typecode the type key
* @param size the SQL length
* @param scale the SQL scale
* @param precision the SQL precision
* @return the associated name with smallest capacity >= size,
* if available and the default type name otherwise
*/
public String get(int typecode, int size, int precision, int scale) throws MappingException {
Map map = (Map) weighted.get( new Integer(typecode) );
if ( map!=null && map.size()>0 ) {
// iterate entries ordered by capacity to find first fit
Iterator entries = map.entrySet().iterator();
while ( entries.hasNext() ) {
Map.Entry entry = (Map.Entry)entries.next();
if ( size <= ( (Integer) entry.getKey() ).intValue() ) {
return replace( (String) entry.getValue(), size, precision, scale );
}
}
}
return replace( get(typecode), size, precision, scale );
}
private static String replace(String type, int size, int precision, int scale) {
type = StringHelper.replaceOnce(type, "$s", Integer.toString(scale) );
type = StringHelper.replaceOnce(type, "$l", Integer.toString(size) );
return StringHelper.replaceOnce(type, "$p", Integer.toString(precision) );
}
/**
* set a type name for specified type key and capacity
* @param typecode the type key
*/
public void put(int typecode, int capacity, String value) {
TreeMap map = (TreeMap)weighted.get( new Integer(typecode) );
if (map == null) {// add new ordered map
map = new TreeMap();
weighted.put( new Integer(typecode), map );
}
map.put(new Integer(capacity), value);
}
/**
* set a default type name for specified type key
* @param typecode the type key
*/
public void put(int typecode, String value) {
defaults.put( new Integer(typecode), value );
}
}
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