Hibernate example source code file (PersistentSortedSet.java)

This example Hibernate source code file (PersistentSortedSet.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

comparator, hibernateexception, io, iterator, object, object, persistentsortedset, persistentsortedset, setproxy, soap, sortedset, sortedset, subsetproxy, subsetproxy, treemap, util

The Hibernate PersistentSortedSet.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008-2011, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.collection.internal;

import java.io.Serializable;
import java.util.Comparator;
import java.util.Iterator;
import java.util.SortedSet;
import java.util.TreeMap;

import org.hibernate.EntityMode;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.persister.collection.BasicCollectionPersister;

/**
 * A persistent wrapper for a <tt>java.util.SortedSet. Underlying
 * collection is a <tt>TreeSet.
 *
 * @see java.util.TreeSet
 * @author <a href="mailto:doug.currie@alum.mit.edu">e
 */
public class PersistentSortedSet extends PersistentSet implements SortedSet {

	protected Comparator comparator;

	protected Serializable snapshot(BasicCollectionPersister persister, EntityMode entityMode) 
	throws HibernateException {
		//if (set==null) return new Set(session);
		TreeMap clonedSet = new TreeMap(comparator);
		Iterator iter = set.iterator();
		while ( iter.hasNext() ) {
			Object copy = persister.getElementType().deepCopy( iter.next(), persister.getFactory() );
			clonedSet.put(copy, copy);
		}
		return clonedSet;
	}

	public void setComparator(Comparator comparator) {
		this.comparator = comparator;
	}

	public PersistentSortedSet(SessionImplementor session) {
		super(session);
	}

	public PersistentSortedSet(SessionImplementor session, SortedSet set) {
		super(session, set);
		comparator = set.comparator();
	}

	public PersistentSortedSet() {} //needed for SOAP libraries, etc

	/**
	 * @see PersistentSortedSet#comparator()
	 */
	public Comparator comparator() {
		return comparator;
	}

	/**
	 * @see PersistentSortedSet#subSet(Object,Object)
	 */
	public SortedSet subSet(Object fromElement, Object toElement) {
		read();
		SortedSet s;
		s = ( (SortedSet) set ).subSet(fromElement, toElement);
		return new SubSetProxy(s);
	}

	/**
	 * @see PersistentSortedSet#headSet(Object)
	 */
	public SortedSet headSet(Object toElement) {
		read();
		SortedSet s = ( (SortedSet) set ).headSet(toElement);
		return new SubSetProxy(s);
	}

	/**
	 * @see PersistentSortedSet#tailSet(Object)
	 */
	public SortedSet tailSet(Object fromElement) {
		read();
		SortedSet s = ( (SortedSet) set ).tailSet(fromElement);
		return new SubSetProxy(s);
	}

	/**
	 * @see PersistentSortedSet#first()
	 */
	public Object first() {
		read();
		return ( (SortedSet) set ).first();
	}

	/**
	 * @see PersistentSortedSet#last()
	 */
	public Object last() {
		read();
		return ( (SortedSet) set ).last();
	}

	/** wrapper for subSets to propagate write to its backing set */
	class SubSetProxy extends SetProxy implements SortedSet {

		SubSetProxy(SortedSet s) {
			super(s);
		}

		public Comparator comparator() {
			return ( (SortedSet) this.set ).comparator();
		}

		public Object first() {
			return ( (SortedSet) this.set ).first();
		}

		public SortedSet headSet(Object toValue) {
			return new SubSetProxy( ( (SortedSet) this.set ).headSet(toValue) );
		}

		public Object last() {
			return ( (SortedSet) this.set ).last();
		}

		public SortedSet subSet(Object fromValue, Object toValue) {
			return new SubSetProxy( ( (SortedSet) this.set ).subSet(fromValue, toValue) );
		}

		public SortedSet tailSet(Object fromValue) {
			return new SubSetProxy( ( (SortedSet) this.set ).tailSet(fromValue) );
		}

	}

}