zkoss/zk

package org.zkoss.json.parser;

/**
 * ParseException explains why and where the error occurs in source JSON text.
 * 
 * @author FangYidong<fangyidong@yahoo.com.cn>
 *
 */
public class ParseException extends RuntimeException {
    private static final long serialVersionUID = -7880698968187728548L;
    
    public static final int ERROR_UNEXPECTED_CHAR = 0;
    public static final int ERROR_UNEXPECTED_TOKEN = 1;
    public static final int ERROR_UNEXPECTED_EXCEPTION = 2;

    private int errorType;
    private Object unexpectedObject;
    private int position;
    
    public ParseException(int errorType){
        this(-1, errorType, null);
    }
    
    public ParseException(int errorType, Object unexpectedObject){
        this(-1, errorType, unexpectedObject);
    }
    
    public ParseException(int position, int errorType, Object unexpectedObject){
        this.position = position;
        this.errorType = errorType;
        this.unexpectedObject = unexpectedObject;
    }
    
    public int getErrorType() {
        return errorType;
    }
    
    public void setErrorType(int errorType) {
        this.errorType = errorType;
    }
    
    /**
     * @see org.zkoss.json.parser.JSONParser#getPosition()
     * 
     * @return The character position (starting with 0) of the input where the error occurs.
     */
    public int getPosition() {
        return position;
    }
    
    public void setPosition(int position) {
        this.position = position;
    }
    
    /**
     * @see org.zkoss.json.parser.Yytoken
     * 
     * @return One of the following base on the value of errorType:
     *                ERROR_UNEXPECTED_CHAR        java.lang.Character
     *             ERROR_UNEXPECTED_TOKEN        org.zkoss.json.parser.Yytoken
     *             ERROR_UNEXPECTED_EXCEPTION    java.lang.Exception
     */
    public Object getUnexpectedObject() {
        return unexpectedObject;
    }
    
    public void setUnexpectedObject(Object unexpectedObject) {
        this.unexpectedObject = unexpectedObject;
    }
    
    public String toString(){
        StringBuffer sb = new StringBuffer();
        
        switch(errorType){
        case ERROR_UNEXPECTED_CHAR:
            sb.append("Unexpected character (").append(unexpectedObject).append(") at position ").append(position).append('.');
            break;
        case ERROR_UNEXPECTED_TOKEN:
            sb.append("Unexpected token ").append(unexpectedObject).append(" at position ").append(position).append('.');
            break;
        case ERROR_UNEXPECTED_EXCEPTION:
            sb.append("Unexpected exception at position ").append(position).append(": ").append(unexpectedObject);
            break;
        default:
            sb.append("Unkown error at position ").append(position).append('.');
            break;
        }
        return sb.toString();
    }
}