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Hibernate example source code file (SelectFragment.java)

This example Hibernate source code file (SelectFragment.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, hashset, iterator, iterator, list, list, selectfragment, selectfragment, string, string, stringbuffer, util

The Hibernate SelectFragment.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.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import org.hibernate.internal.util.StringHelper;

/**
 * A fragment of an SQL <tt>SELECT clause
 *
 * @author Gavin King
 */
public class SelectFragment {
	private String suffix;
	private List columns = new ArrayList();
	//private List aliases = new ArrayList();
	private List columnAliases = new ArrayList();
	private String extraSelectList;
	private String[] usedAliases;

	public SelectFragment() {}

	public List getColumns() {
		return columns;
	}

	public String getExtraSelectList() {
		return extraSelectList;
	}

	public SelectFragment setUsedAliases(String[] aliases) {
		usedAliases = aliases;
		return this;
	}

	public SelectFragment setExtraSelectList(String extraSelectList) {
		this.extraSelectList = extraSelectList;
		return this;
	}

	public SelectFragment setExtraSelectList(CaseFragment caseFragment, String fragmentAlias) {
		setExtraSelectList( caseFragment.setReturnColumnName(fragmentAlias, suffix).toFragmentString() );
		return this;
	}

	public SelectFragment setSuffix(String suffix) {
		this.suffix = suffix;
		return this;
	}

	public SelectFragment addColumn(String columnName) {
		addColumn(null, columnName);
		return this;
	}

	public SelectFragment addColumns(String[] columnNames) {
		for (int i=0; i<columnNames.length; i++) addColumn( columnNames[i] );
		return this;
	}

	public SelectFragment addColumn(String tableAlias, String columnName) {
		return addColumn(tableAlias, columnName, columnName);
	}

	public SelectFragment addColumn(String tableAlias, String columnName, String columnAlias) {
		columns.add( StringHelper.qualify(tableAlias, columnName) );
		//columns.add(columnName);
		//aliases.add(tableAlias);
		columnAliases.add(columnAlias);
		return this;
	}

	public SelectFragment addColumns(String tableAlias, String[] columnNames) {
		for (int i=0; i<columnNames.length; i++) addColumn( tableAlias, columnNames[i] );
		return this;
	}

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

	public SelectFragment addFormulas(String tableAlias, String[] formulas, String[] formulaAliases) {
		for ( int i=0; i<formulas.length; i++ ) {
			if ( formulas[i]!=null ) addFormula( tableAlias, formulas[i], formulaAliases[i] );
		}
		return this;
	}

	public SelectFragment addFormula(String tableAlias, String formula, String formulaAlias) {
		columns.add( StringHelper.replace( formula, Template.TEMPLATE, tableAlias ) );
		columnAliases.add(formulaAlias);
		return this;
	}

	public SelectFragment addColumnTemplate(String tableAlias, String columnTemplate, String columnAlias) {
		// In this context, there's no difference between a column template and a formula.
		return addFormula( tableAlias, columnTemplate, columnAlias );
	}

	public SelectFragment addColumnTemplates(String tableAlias, String[] columnTemplates, String columnAliases[]) {
		// In this context, there's no difference between a column template and a formula.
		return addFormulas( tableAlias, columnTemplates, columnAliases );
	}

	public String toFragmentString() {
		StringBuffer buf = new StringBuffer( columns.size() * 10 );
		Iterator iter = columns.iterator();
		Iterator columnAliasIter = columnAliases.iterator();
		//HashMap columnsUnique = new HashMap();
		HashSet columnsUnique = new HashSet();
		if (usedAliases!=null) columnsUnique.addAll( Arrays.asList(usedAliases) );
		while ( iter.hasNext() ) {
			String column = (String) iter.next();
			String columnAlias = (String) columnAliasIter.next();
			//TODO: eventually put this back in, once we think all is fixed
			//Object otherAlias = columnsUnique.put(qualifiedColumn, columnAlias);
			/*if ( otherAlias!=null && !columnAlias.equals(otherAlias) ) {
				throw new AssertionFailure("bug in Hibernate SQL alias generation");
			}*/
			if ( columnsUnique.add(columnAlias) ) {
				buf.append(", ")
					.append(column)
					.append(" as ");
				if (suffix==null) {
					buf.append(columnAlias);
				}
				else {
					buf.append( new Alias(suffix).toAliasString(columnAlias) );
				}
			}
		}
		if (extraSelectList!=null) {
			buf.append(", ")
				.append(extraSelectList);
		}
		return buf.toString();
	}

}

Other Hibernate examples (source code examples)

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