//$Id: PreprocessingParser.java 5063 2004-12-24 03:51:20Z pgmjsd $
package org.hibernate.hql.classic;
import org.hibernate.QueryException;
import org.hibernate.hql.CollectionProperties;
import org.hibernate.util.StringHelper;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
*
*/
public class PreprocessingParser implements Parser {
private static final Set HQL_OPERATORS;
static {
HQL_OPERATORS = new HashSet();
HQL_OPERATORS.add( "<=" );
HQL_OPERATORS.add( ">=" );
HQL_OPERATORS.add( "=>" );
HQL_OPERATORS.add( "=<" );
HQL_OPERATORS.add( "!=" );
HQL_OPERATORS.add( "<>" );
HQL_OPERATORS.add( "!#" );
HQL_OPERATORS.add( "!~" );
HQL_OPERATORS.add( "!<" );
HQL_OPERATORS.add( "!>" );
HQL_OPERATORS.add( "is not" );
HQL_OPERATORS.add( "not like" );
HQL_OPERATORS.add( "not in" );
HQL_OPERATORS.add( "not between" );
HQL_OPERATORS.add( "not exists" );
}
private Map replacements;
private boolean quoted;
private StringBuffer quotedString;
private ClauseParser parser = new ClauseParser();
private String lastToken;
private String currentCollectionProp;
public PreprocessingParser(Map replacements) {
this.replacements = replacements;
}
public void token(String token, QueryTranslatorImpl q) throws QueryException {
//handle quoted strings
if ( quoted ) {
quotedString.append( token );
}
if ( "'".equals( token ) ) {
if ( quoted ) {
token = quotedString.toString();
}
else {
quotedString = new StringBuffer( 20 ).append( token );
}
quoted = !quoted;
}
if ( quoted ) return;
//ignore whitespace
if ( ParserHelper.isWhitespace( token ) ) return;
//do replacements
String substoken = ( String ) replacements.get( token );
token = ( substoken == null ) ? token : substoken;
//handle HQL2 collection syntax
if ( currentCollectionProp != null ) {
if ( "(".equals( token ) ) {
return;
}
else if ( ")".equals( token ) ) {
currentCollectionProp = null;
return;
}
else {
token = StringHelper.qualify( token, currentCollectionProp );
}
}
else {
String prop = CollectionProperties.getNormalizedPropertyName( token.toLowerCase() );
if ( prop != null ) {
currentCollectionProp = prop;
return;
}
}
//handle <=, >=, !=, is not, not between, not in
if ( lastToken == null ) {
lastToken = token;
}
else {
String doubleToken = ( token.length() > 1 ) ?
lastToken + ' ' + token :
lastToken + token;
if ( HQL_OPERATORS.contains( doubleToken.toLowerCase() ) ) {
parser.token( doubleToken, q );
lastToken = null;
}
else {
parser.token( lastToken, q );
lastToken = token;
}
}
}
public void start(QueryTranslatorImpl q) throws QueryException {
quoted = false;
parser.start( q );
}
public void end(QueryTranslatorImpl q) throws QueryException {
if ( lastToken != null ) parser.token( lastToken, q );
parser.end( q );
lastToken = null;
currentCollectionProp = null;
}
}
|