//$Id: SelectFragment.java 7479 2005-07-14 23:56:53Z oneovthafew $
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.util.StringHelper;
/**
* A fragment of an SQL <tt>SELECT</tt> 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 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 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();
}
}
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