// $Id: GeneratedCollectionAliases.java 8410 2005-10-14 22:43:44Z maxcsaucdk $
package org.hibernate.loader;
import java.util.Map;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.util.CollectionHelper;
import org.hibernate.util.StringHelper;
/**
* CollectionAliases which handles the logic of selecting user provided aliases (via return-property),
* before using the default aliases.
*
* @author Steve Ebersole and Max Rydahl Andersen
*/
public class GeneratedCollectionAliases implements CollectionAliases {
private final String suffix;
private final String[] keyAliases;
private final String[] indexAliases;
private final String[] elementAliases;
private final String identifierAlias;
private Map userProvidedAliases;
public GeneratedCollectionAliases(Map userProvidedAliases, CollectionPersister persister, String suffix) {
this.suffix = suffix;
this.userProvidedAliases = userProvidedAliases;
this.keyAliases = getUserProvidedAliases(
"key",
persister.getKeyColumnAliases( suffix )
);
this.indexAliases = getUserProvidedAliases(
"index",
persister.getIndexColumnAliases( suffix )
);
this.elementAliases = getUserProvidedAliases( "element",
persister.getElementColumnAliases( suffix )
);
this.identifierAlias = getUserProvidedAlias( "id",
persister.getIdentifierColumnAlias( suffix )
);
}
public GeneratedCollectionAliases(CollectionPersister persister, String string) {
this(CollectionHelper.EMPTY_MAP, persister, string);
}
/**
* Returns the suffixed result-set column-aliases for columns making up the key for this collection (i.e., its FK to
* its owner).
*
* @return The key result-set column aliases.
*/
public String[] getSuffixedKeyAliases() {
return keyAliases;
}
/**
* Returns the suffixed result-set column-aliases for the collumns making up the collection's index (map or list).
*
* @return The index result-set column aliases.
*/
public String[] getSuffixedIndexAliases() {
return indexAliases;
}
/**
* Returns the suffixed result-set column-aliases for the columns making up the collection's elements.
*
* @return The element result-set column aliases.
*/
public String[] getSuffixedElementAliases() {
return elementAliases;
}
/**
* Returns the suffixed result-set column-aliases for the column defining the collection's identifier (if any).
*
* @return The identifier result-set column aliases.
*/
public String getSuffixedIdentifierAlias() {
return identifierAlias;
}
/**
* Returns the suffix used to unique the column aliases for this particular alias set.
*
* @return The uniqued column alias suffix.
*/
public String getSuffix() {
return suffix;
}
public String toString() {
return super.toString() + " [suffix=" + suffix +
", suffixedKeyAliases=[" + join( keyAliases ) +
"], suffixedIndexAliases=[" + join( indexAliases ) +
"], suffixedElementAliases=[" + join( elementAliases ) +
"], suffixedIdentifierAlias=[" + identifierAlias + "]]";
}
private String join(String[] aliases) {
if ( aliases == null) return null;
return StringHelper.join( ", ", aliases );
}
private String[] getUserProvidedAliases(String propertyPath, String[] defaultAliases) {
String[] result = (String[]) userProvidedAliases.get(propertyPath);
if (result==null) {
return defaultAliases;
}
else {
return result;
}
}
private String getUserProvidedAlias(String propertyPath, String defaultAlias) {
String[] columns = (String[]) userProvidedAliases.get(propertyPath);
if (columns==null) {
return defaultAlias;
}
else {
return columns[0];
}
}
}
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