Hibernate example source code file (SimpleSelect.java)

This example Hibernate source code file (SimpleSelect.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

arraylist, dialect, iterator, list, lockoptions, lockoptions, map, set, simpleselect, simpleselect, string, string, stringbuffer, stringbuffer, util

The Hibernate SimpleSelect.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC 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 Middleware LLC.
 *
 * 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.sql;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.hibernate.LockMode;
import org.hibernate.LockOptions;
import org.hibernate.dialect.Dialect;

/**
 * An SQL <tt>SELECT statement with no table joins
 *
 * @author Gavin King
 */
public class SimpleSelect {

	public SimpleSelect(Dialect dialect) {
		this.dialect = dialect;
	}

	//private static final Alias DEFAULT_ALIAS = new Alias(10, null);

	private String tableName;
	private String orderBy;
	private Dialect dialect;
	private LockOptions lockOptions = new LockOptions( LockMode.READ);
	private String comment;

	private List columns = new ArrayList();
	private Map aliases = new HashMap();
	private List whereTokens = new ArrayList();

	public SimpleSelect addColumns(String[] columnNames, String[] columnAliases) {
		for ( int i=0; i<columnNames.length; i++ ) {
			if ( columnNames[i]!=null  ) {
				addColumn( columnNames[i], columnAliases[i] );
			}
		}
		return this;
	}

	public SimpleSelect addColumns(String[] columns, String[] aliases, boolean[] ignore) {
		for ( int i=0; i<ignore.length; i++ ) {
			if ( !ignore[i] && columns[i]!=null ) {
				addColumn( columns[i], aliases[i] );
			}
		}
		return this;
	}

	public SimpleSelect addColumns(String[] columnNames) {
		for ( int i=0; i<columnNames.length; i++ ) {
			if ( columnNames[i]!=null ) addColumn( columnNames[i] );
		}
		return this;
	}
	public SimpleSelect addColumn(String columnName) {
		columns.add(columnName);
		//aliases.put( columnName, DEFAULT_ALIAS.toAliasString(columnName) );
		return this;
	}

	public SimpleSelect addColumn(String columnName, String alias) {
		columns.add(columnName);
		aliases.put(columnName, alias);
		return this;
	}

	public SimpleSelect setTableName(String tableName) {
		this.tableName = tableName;
		return this;
	}

	public SimpleSelect setLockOptions( LockOptions lockOptions ) {
	   LockOptions.copy(lockOptions, this.lockOptions);
		return this;
	}

	public SimpleSelect setLockMode(LockMode lockMode) {
		this.lockOptions.setLockMode( lockMode );
		return this;
	}

	public SimpleSelect addWhereToken(String token) {
		whereTokens.add(token);
		return this;
	}
	
	private void and() {
		if ( whereTokens.size()>0 ) {
			whereTokens.add("and");
		}
	}

	public SimpleSelect addCondition(String lhs, String op, String rhs) {
		and();
		whereTokens.add( lhs + ' ' + op + ' ' + rhs );
		return this;
	}

	public SimpleSelect addCondition(String lhs, String condition) {
		and();
		whereTokens.add( lhs + ' ' + condition );
		return this;
	}

	public SimpleSelect addCondition(String[] lhs, String op, String[] rhs) {
		for ( int i=0; i<lhs.length; i++ ) {
			addCondition( lhs[i], op, rhs[i] );
		}
		return this;
	}

	public SimpleSelect addCondition(String[] lhs, String condition) {
		for ( int i=0; i<lhs.length; i++ ) {
			if ( lhs[i]!=null ) addCondition( lhs[i], condition );
		}
		return this;
	}

	public String toStatementString() {
		StringBuffer buf = new StringBuffer( 
				columns.size()*10 + 
				tableName.length() + 
				whereTokens.size() * 10 + 
				10 
			);
		
		if ( comment!=null ) {
			buf.append("/* ").append(comment).append(" */ ");
		}
		
		buf.append("select ");
		Set uniqueColumns = new HashSet();
		Iterator iter = columns.iterator();
		boolean appendComma = false;
		while ( iter.hasNext() ) {
			String col = (String) iter.next();
			String alias = (String) aliases.get(col);
			if ( uniqueColumns.add(alias==null ? col : alias) ) {
				if (appendComma) buf.append(", ");
				buf.append(col);
				if ( alias!=null && !alias.equals(col) ) {
					buf.append(" as ")
						.append(alias);
				}
				appendComma = true;
			}
		}
		
		buf.append(" from ")
			.append( dialect.appendLockHint(lockOptions.getLockMode(), tableName) );
		
		if ( whereTokens.size() > 0 ) {
			buf.append(" where ")
				.append( toWhereClause() );
		}
		
		if (orderBy!=null) buf.append(orderBy);
		
		if (lockOptions!=null) {
			buf.append( dialect.getForUpdateString(lockOptions) );
		}

		return dialect.transformSelectString( buf.toString() );
	}

	public String toWhereClause() {
		StringBuffer buf = new StringBuffer( whereTokens.size() * 5 );
		Iterator iter = whereTokens.iterator();
		while ( iter.hasNext() ) {
			buf.append( iter.next() );
			if ( iter.hasNext() ) buf.append(' ');
		}
		return buf.toString();
	}

	public SimpleSelect setOrderBy(String orderBy) {
		this.orderBy = orderBy;
		return this;
	}

	public SimpleSelect setComment(String comment) {
		this.comment = comment;
		return this;
	}

}