Package org.hibernate.persister.entity

Source Code of org.hibernate.persister.entity.AbstractPropertyMapping

//$Id: AbstractPropertyMapping.java 10852 2006-11-21 17:39:14Z steve.ebersole@jboss.com $
package org.hibernate.persister.entity;

import java.util.HashMap;
import java.util.Map;

import org.hibernate.MappingException;
import org.hibernate.QueryException;
import org.hibernate.engine.Mapping;
import org.hibernate.sql.Template;
import org.hibernate.type.AbstractComponentType;
import org.hibernate.type.AssociationType;
import org.hibernate.type.EntityType;
import org.hibernate.type.Type;
import org.hibernate.util.ArrayHelper;
import org.hibernate.util.StringHelper;

/**
* Base implementation of a <tt>PropertyMapping</tt>
*
* @author Gavin King
*/
public abstract class AbstractPropertyMapping implements PropertyMapping {

  private final Map typesByPropertyPath = new HashMap();
  private final Map columnsByPropertyPath = new HashMap();
  private final Map formulaTemplatesByPropertyPath = new HashMap();

  public String[] getIdentifierColumnNames() {
    throw new UnsupportedOperationException("one-to-one is not supported here");
  }

  protected abstract String getEntityName();

  public Type toType(String propertyName) throws QueryException {
    Type type = (Type) typesByPropertyPath.get(propertyName);
    if ( type == null ) {
      throw propertyException( propertyName );
    }
    return type;
  }

  protected final QueryException propertyException(String propertyName) throws QueryException {
    return new QueryException( "could not resolve property: " + propertyName + " of: " + getEntityName() );
  }

  public String[] getColumnNames(String propertyName) {
    String[] cols = (String[]) columnsByPropertyPath.get(propertyName);
    if (cols==null) {
      throw new MappingException("unknown property: " + propertyName);
    }
    return cols;
  }

  public String[] toColumns(String alias, String propertyName) throws QueryException {
    //TODO: *two* hashmap lookups here is one too many...
    String[] columns = (String[]) columnsByPropertyPath.get(propertyName);
    if ( columns == null ) {
      throw propertyException( propertyName );
    }
    String[] templates = (String[]) formulaTemplatesByPropertyPath.get(propertyName);
    String[] result = new String[columns.length];
    for ( int i=0; i<columns.length; i++ ) {
      if ( columns[i]==null ) {
        result[i] = StringHelper.replace( templates[i], Template.TEMPLATE, alias );
      }
      else {
        result[i] = StringHelper.qualify( alias, columns[i] );
      }
    }
    return result;
  }

  public String[] toColumns(String propertyName) throws QueryException {
    String[] columns = (String[]) columnsByPropertyPath.get(propertyName);
    if ( columns == null ) {
      throw propertyException( propertyName );
    }
    String[] templates = (String[]) formulaTemplatesByPropertyPath.get(propertyName);
    String[] result = new String[columns.length];
    for ( int i=0; i<columns.length; i++ ) {
      if ( columns[i]==null ) {
        result[i] = StringHelper.replace( templates[i], Template.TEMPLATE, "" );
      }
      else {
        result[i] = columns[i];
      }
    }
    return result;
  }

  protected void addPropertyPath(String path, Type type, String[] columns, String[] formulaTemplates) {
    typesByPropertyPath.put(path, type);
    columnsByPropertyPath.put(path, columns);
    if (formulaTemplates!=null) {
      formulaTemplatesByPropertyPath.put(path, formulaTemplates);
    }
  }

  /*protected void initPropertyPaths(
      final String path,
      final Type type,
      final String[] columns,
      final String[] formulaTemplates,
      final Mapping factory)
  throws MappingException {
    //addFormulaPropertyPath(path, type, formulaTemplates);
    initPropertyPaths(path, type, columns, formulaTemplates, factory);
  }*/

  protected void initPropertyPaths(
      final String path,
      final Type type,
      String[] columns,
      final String[] formulaTemplates,
      final Mapping factory)
  throws MappingException {

    if ( columns.length!=type.getColumnSpan(factory) ) {
      throw new MappingException(
          "broken column mapping for: " + path +
          " of: " + getEntityName()
        );
    }

    if ( type.isAssociationType() ) {
      AssociationType actype = (AssociationType) type;
      if ( actype.useLHSPrimaryKey() ) {
        columns = getIdentifierColumnNames();
      }
      else {
        String foreignKeyProperty = actype.getLHSPropertyName();
        if ( foreignKeyProperty!=null && !path.equals(foreignKeyProperty) ) {
          //TODO: this requires that the collection is defined after the
          //      referenced property in the mapping file (ok?)
          columns = (String[]) columnsByPropertyPath.get(foreignKeyProperty);
          if (columns==null) return; //get em on the second pass!
        }
      }
    }

    if (path!=null) addPropertyPath(path, type, columns, formulaTemplates);

    if ( type.isComponentType() ) {
      AbstractComponentType actype = (AbstractComponentType) type;
      initComponentPropertyPaths( path, actype, columns, formulaTemplates, factory );
      if ( actype.isEmbedded() ) {
        initComponentPropertyPaths(
            path==null ? null : StringHelper.qualifier(path),
            actype,
            columns,
            formulaTemplates,
            factory
          );
      }
    }
    else if ( type.isEntityType() ) {
      initIdentifierPropertyPaths( path, (EntityType) type, columns, factory );
    }
  }

  protected void initIdentifierPropertyPaths(
      final String path,
      final EntityType etype,
      final String[] columns,
      final Mapping factory) throws MappingException {

    Type idtype = etype.getIdentifierOrUniqueKeyType( factory );
    String idPropName = etype.getIdentifierOrUniqueKeyPropertyName(factory);
    boolean hasNonIdentifierPropertyNamedId = hasNonIdentifierPropertyNamedId( etype, factory );

    if ( etype.isReferenceToPrimaryKey() ) {
      if ( !hasNonIdentifierPropertyNamedId ) {
        String idpath1 = extendPath(path, EntityPersister.ENTITY_ID);
        addPropertyPath(idpath1, idtype, columns, null);
        initPropertyPaths(idpath1, idtype, columns, null, factory);
      }
    }

    if (idPropName!=null) {
      String idpath2 = extendPath(path, idPropName);
      addPropertyPath(idpath2, idtype, columns, null);
      initPropertyPaths(idpath2, idtype, columns, null, factory);
    }
  }

  private boolean hasNonIdentifierPropertyNamedId(final EntityType entityType, final Mapping factory) {
    // TODO : would be great to have a Mapping#hasNonIdentifierPropertyNamedId method
    // I don't believe that Mapping#getReferencedPropertyType accounts for the identifier property; so
    // if it returns for a property named 'id', then we should have a non-id field named id
    try {
      return factory.getReferencedPropertyType( entityType.getAssociatedEntityName(), EntityPersister.ENTITY_ID ) != null;
    }
    catch( MappingException e ) {
      return false;
    }
  }

  protected void initComponentPropertyPaths(
      final String path,
      final AbstractComponentType type,
      final String[] columns,
      String[] formulaTemplates, final Mapping factory)
  throws MappingException {

    Type[] types = type.getSubtypes();
    String[] properties = type.getPropertyNames();
    int begin=0;
    for ( int i=0; i<properties.length; i++ ) {
      String subpath = extendPath( path, properties[i] );
      try {
        int length = types[i].getColumnSpan(factory);
        String[] columnSlice = ArrayHelper.slice(columns, begin, length);
        String[] formulaSlice = formulaTemplates==null ?
            null : ArrayHelper.slice(formulaTemplates, begin, length);
        initPropertyPaths(subpath, types[i], columnSlice, formulaSlice, factory);
        begin+=length;
      }
      catch (Exception e) {
        throw new MappingException("bug in initComponentPropertyPaths", e);
      }
    }
  }

  private static String extendPath(String path, String property) {
    if ( path==null || "".equals(path) ) {
      return property;
    }
    else {
      return StringHelper.qualify(path, property);
    }
  }

}
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