/*
* #%L
* JSQLParser library
* %%
* Copyright (C) 2004 - 2013 JSQLParser
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 2.1 of the
* License, or (at your option) any later version.
*
* 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 General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/lgpl-2.1.html>.
* #L%
*/
package net.sf.jsqlparser.util.deparser;
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.expression.ExpressionVisitor;
import net.sf.jsqlparser.schema.Column;
import net.sf.jsqlparser.statement.select.Join;
import net.sf.jsqlparser.statement.select.PlainSelect;
import net.sf.jsqlparser.statement.update.Update;
import net.sf.jsqlparser.statement.select.Select;
import net.sf.jsqlparser.statement.select.SelectVisitor;
/**
* A class to de-parse (that is, tranform from JSqlParser hierarchy into a
* string) an {@link net.sf.jsqlparser.statement.update.Update}
*/
public class UpdateDeParser {
private StringBuilder buffer;
private ExpressionVisitor expressionVisitor;
private SelectVisitor selectVisitor;
/**
* @param expressionVisitor a {@link ExpressionVisitor} to de-parse
* expressions. It has to share the same<br>
* StringBuilder (buffer parameter) as this object in order to work
* @param selectVisitor a {@link SelectVisitor} to de-parse
* {@link net.sf.jsqlparser.statement.select.Select}s. It has to share the
* same<br>
* StringBuilder (buffer parameter) as this object in order to work
* @param buffer the buffer that will be filled with the select
*/
public UpdateDeParser(ExpressionVisitor expressionVisitor, SelectVisitor selectVisitor, StringBuilder buffer) {
this.buffer = buffer;
this.expressionVisitor = expressionVisitor;
this.selectVisitor = selectVisitor;
}
public StringBuilder getBuffer() {
return buffer;
}
public void setBuffer(StringBuilder buffer) {
this.buffer = buffer;
}
public void deParse(Update update) {
buffer.append("UPDATE ").append(PlainSelect.getStringList(update.getTables(), true, false)).append(" SET ");
if (!update.isUseSelect()) {
for (int i = 0; i < update.getColumns().size(); i++) {
Column column = update.getColumns().get(i);
buffer.append(column.getFullyQualifiedName()).append(" = ");
Expression expression = update.getExpressions().get(i);
expression.accept(expressionVisitor);
if (i < update.getColumns().size() - 1) {
buffer.append(", ");
}
}
} else {
if (update.isUseColumnsBrackets()) {
buffer.append("(");
}
for (int i = 0; i < update.getColumns().size(); i++) {
if (i != 0) {
buffer.append(", ");
}
Column column = update.getColumns().get(i);
buffer.append(column.getFullyQualifiedName());
}
if (update.isUseColumnsBrackets()) {
buffer.append(")");
}
buffer.append(" = ");
buffer.append("(");
Select select = update.getSelect();
select.getSelectBody().accept(selectVisitor);
buffer.append(")");
}
if (update.getFromItem() != null) {
buffer.append(" FROM ").append(update.getFromItem());
if (update.getJoins() != null) {
for (Join join : update.getJoins()) {
if (join.isSimple()) {
buffer.append(", ").append(join);
} else {
buffer.append(" ").append(join);
}
}
}
}
if (update.getWhere() != null) {
buffer.append(" WHERE ");
update.getWhere().accept(expressionVisitor);
}
}
public ExpressionVisitor getExpressionVisitor() {
return expressionVisitor;
}
public void setExpressionVisitor(ExpressionVisitor visitor) {
expressionVisitor = visitor;
}
}