content: 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.update.Update;
  
  /**
   * 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 {
  	protected StringBuffer buffer;
  	protected ExpressionVisitor expressionVisitor;
  	
  	public UpdateDeParser() {
  	}
  	
  	/**
  	 * @param expressionVisitor a {@link ExpressionVisitor} to de-parse expressions. It has to share the same<br>
  	 * StringBuffer (buffer parameter) as this object in order to work
  	 * @param buffer the buffer that will be filled with the select
  	 */
  	public UpdateDeParser(ExpressionVisitor expressionVisitor, StringBuffer buffer) {
  		this.buffer = buffer;
  		this.expressionVisitor = expressionVisitor;
  	}
  
  	public StringBuffer getBuffer() {
  		return buffer;
  	}
  
  	public void setBuffer(StringBuffer buffer) {
  		this.buffer = buffer;
  	}
  
  	public void deParse(Update update) {
  		buffer.append("UPDATE " + update.getTable().getWholeTableName() + " SET ");
  		for (int i = 0; i < update.getColumns().size(); i++) {
  			Column column = (Column) update.getColumns().get(i);
  			buffer.append(column.getWholeColumnName() + "=");
  
  			Expression expression = (Expression) update.getExpressions().get(i);
  			expression.accept(expressionVisitor);
  			if (i < update.getColumns().size() - 1) {
  				buffer.append(", ");
  			}
  
  		}
  		
  		if (update.getWhere() != null) {
  			buffer.append(" WHERE ");
  			update.getWhere().accept(expressionVisitor);
  		}
  
  	}
  
  	public ExpressionVisitor getExpressionVisitor() {
  		return expressionVisitor;
  	}
  
  	public void setExpressionVisitor(ExpressionVisitor visitor) {
  		expressionVisitor = visitor;
  	}
  
  }
  