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Viewing changes to src/org/hibernate/property/BackrefPropertyAccessor.java

  • Committer: Bazaar Package Importer
  • Author(s): Torsten Werner
  • Date: 2007-10-14 14:43:34 UTC
  • Revision ID: james.westby@ubuntu.com-20071014144334-eamc8i0q10gs1aro
Tags: upstream-3.2.5
Import upstream version 3.2.5

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src/org/hibernate/property/BackrefPropertyAccessor.java
 
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//$Id: BackrefPropertyAccessor.java 7516 2005-07-16 22:20:48Z oneovthafew $
 
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package org.hibernate.property;
 
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import java.lang.reflect.Method;
 
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import java.util.Map;
 
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import java.io.Serializable;
 
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import org.hibernate.HibernateException;
 
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import org.hibernate.engine.SessionImplementor;
 
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import org.hibernate.engine.SessionFactoryImplementor;
 
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/**
 
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 * Represents a "back-reference" to the id of a collection owner.
 
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 *
 
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 * @author Gavin King
 
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 */
 
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public class BackrefPropertyAccessor implements PropertyAccessor {
 
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        private final String propertyName;
 
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        private final String entityName;
 
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        /**
 
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         * A placeholder for a property value, indicating that
 
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         * we don't know the value of the back reference
 
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         */
 
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        public static final Serializable UNKNOWN = new Serializable() {
 
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                public String toString() { return "<unknown>"; }
 
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                public Object readResolve() {
 
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                        return UNKNOWN;
 
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                }
 
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        };
 
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        /**
 
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         * Constructs a new instance of BackrefPropertyAccessor.
 
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         *
 
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         * @param collectionRole The collection role which this back ref references.
 
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         */
 
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        public BackrefPropertyAccessor(String collectionRole, String entityName) {
 
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                this.propertyName = collectionRole.substring( entityName.length() + 1 );
 
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                this.entityName = entityName;
 
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        }
 
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        public Setter getSetter(Class theClass, String propertyName) {
 
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                return new BackrefSetter();
 
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        }
 
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        public Getter getGetter(Class theClass, String propertyName) {
 
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                return new BackrefGetter();
 
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        }
 
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        /**
 
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         * The Setter implementation for id backrefs.
 
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         */
 
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        public static final class BackrefSetter implements Setter {
 
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                public Method getMethod() {
 
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                        return null;
 
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                }
 
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                public String getMethodName() {
 
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                        return null;
 
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                }
 
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                public void set(Object target, Object value, SessionFactoryImplementor factory) {
 
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                        // this page intentionally left blank :)
 
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                }
 
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        }
 
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        /**
 
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         * The Getter implementation for id backrefs.
 
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         */
 
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        public class BackrefGetter implements Getter {
 
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                public Object getForInsert(Object target, Map mergeMap, SessionImplementor session)
 
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                throws HibernateException {
 
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                        if (session==null) {
 
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                                return UNKNOWN;
 
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                        }
 
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                        else {
 
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                                return session.getPersistenceContext()
 
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                                                .getOwnerId( entityName, propertyName, target, mergeMap );
 
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                        }
 
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                }
 
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                public Object get(Object target)  {
 
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                        return UNKNOWN;
 
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                }
 
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                public Method getMethod() {
 
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                        return null;
 
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                }
 
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                public String getMethodName() {
 
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                        return null;
 
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                }
 
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                public Class getReturnType() {
 
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                        return Object.class;
 
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                }
 
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        }
 
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}
 
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