org.hibernate.sql.QuerySelect Maven / Gradle / Ivy
/*
* 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.HashSet;
import java.util.Iterator;
import org.hibernate.dialect.Dialect;
/**
* A translated HQL query
* @author Gavin King
*/
public class QuerySelect {
private Dialect dialect;
private JoinFragment joins;
private StringBuilder select = new StringBuilder();
private StringBuilder where = new StringBuilder();
private StringBuilder groupBy = new StringBuilder();
private StringBuilder orderBy = new StringBuilder();
private StringBuilder having = new StringBuilder();
private String comment;
private boolean distinct;
private static final HashSet DONT_SPACE_TOKENS = new HashSet();
static {
//dontSpace.add("'");
DONT_SPACE_TOKENS.add(".");
DONT_SPACE_TOKENS.add("+");
DONT_SPACE_TOKENS.add("-");
DONT_SPACE_TOKENS.add("/");
DONT_SPACE_TOKENS.add("*");
DONT_SPACE_TOKENS.add("<");
DONT_SPACE_TOKENS.add(">");
DONT_SPACE_TOKENS.add("=");
DONT_SPACE_TOKENS.add("#");
DONT_SPACE_TOKENS.add("~");
DONT_SPACE_TOKENS.add("|");
DONT_SPACE_TOKENS.add("&");
DONT_SPACE_TOKENS.add("<=");
DONT_SPACE_TOKENS.add(">=");
DONT_SPACE_TOKENS.add("=>");
DONT_SPACE_TOKENS.add("=<");
DONT_SPACE_TOKENS.add("!=");
DONT_SPACE_TOKENS.add("<>");
DONT_SPACE_TOKENS.add("!#");
DONT_SPACE_TOKENS.add("!~");
DONT_SPACE_TOKENS.add("!<");
DONT_SPACE_TOKENS.add("!>");
DONT_SPACE_TOKENS.add("("); //for MySQL
DONT_SPACE_TOKENS.add(")");
}
public QuerySelect(Dialect dialect) {
this.dialect = dialect;
joins = new QueryJoinFragment(dialect, false);
}
public JoinFragment getJoinFragment() {
return joins;
}
public void addSelectFragmentString(String fragment) {
if ( fragment.length()>0 && fragment.charAt(0)==',' ) fragment = fragment.substring(1);
fragment = fragment.trim();
if ( fragment.length()>0 ) {
if ( select.length()>0 ) select.append(", ");
select.append(fragment);
}
}
public void addSelectColumn(String columnName, String alias) {
addSelectFragmentString(columnName + ' ' + alias);
}
public void setDistinct(boolean distinct) {
this.distinct = distinct;
}
public void setWhereTokens(Iterator tokens) {
//if ( conjunctiveWhere.length()>0 ) conjunctiveWhere.append(" and ");
appendTokens(where, tokens);
}
public void prependWhereConditions(String conditions) {
if (where.length() > 0) {
where.insert(0, conditions + " and ");
}
else {
where.append(conditions);
}
}
public void setGroupByTokens(Iterator tokens) {
//if ( groupBy.length()>0 ) groupBy.append(" and ");
appendTokens(groupBy, tokens);
}
public void setOrderByTokens(Iterator tokens) {
//if ( orderBy.length()>0 ) orderBy.append(" and ");
appendTokens(orderBy, tokens);
}
public void setHavingTokens(Iterator tokens) {
//if ( having.length()>0 ) having.append(" and ");
appendTokens(having, tokens);
}
public void addOrderBy(String orderByString) {
if ( orderBy.length() > 0 ) orderBy.append(", ");
orderBy.append(orderByString);
}
public String toQueryString() {
StringBuilder buf = new StringBuilder(50);
if (comment!=null) buf.append("/* ").append(comment).append(" */ ");
buf.append("select ");
if (distinct) buf.append("distinct ");
String from = joins.toFromFragmentString();
if ( from.startsWith(",") ) {
from = from.substring(1);
}
else if ( from.startsWith(" inner join") ){
from = from.substring(11);
}
buf.append( select.toString() )
.append(" from")
.append(from);
String outerJoinsAfterWhere = joins.toWhereFragmentString().trim();
String whereConditions = where.toString().trim();
boolean hasOuterJoinsAfterWhere = outerJoinsAfterWhere.length() > 0;
boolean hasWhereConditions = whereConditions.length() > 0;
if (hasOuterJoinsAfterWhere || hasWhereConditions) {
buf.append(" where ");
if (hasOuterJoinsAfterWhere) {
buf.append( outerJoinsAfterWhere.substring(4) );
}
if (hasWhereConditions) {
if (hasOuterJoinsAfterWhere) {
buf.append(" and (");
}
buf.append(whereConditions);
if (hasOuterJoinsAfterWhere) {
buf.append(")");
}
}
}
if ( groupBy.length() > 0 ) buf.append(" group by ").append( groupBy.toString() );
if ( having.length() > 0 ) buf.append(" having ").append( having.toString() );
if ( orderBy.length() > 0 ) buf.append(" order by ").append( orderBy.toString() );
return dialect.transformSelectString( buf.toString() );
}
private static void appendTokens(StringBuilder buf, Iterator iter) {
boolean lastSpaceable=true;
boolean lastQuoted=false;
while ( iter.hasNext() ) {
String token = (String) iter.next();
boolean spaceable = !DONT_SPACE_TOKENS.contains(token);
boolean quoted = token.startsWith("'");
if (spaceable && lastSpaceable) {
if ( !quoted || !lastQuoted ) buf.append(' ');
}
lastSpaceable = spaceable;
buf.append(token);
lastQuoted = token.endsWith("'");
}
}
public void setComment(String comment) {
this.comment = comment;
}
public QuerySelect copy() {
QuerySelect copy = new QuerySelect(dialect);
copy.joins = this.joins.copy();
copy.select.append( this.select.toString() );
copy.where.append( this.where.toString() );
copy.groupBy.append( this.groupBy.toString() );
copy.orderBy.append( this.orderBy.toString() );
copy.having.append( this.having.toString() );
copy.comment = this.comment;
copy.distinct = this.distinct;
return copy;
}
}