| gvSIG desktop 1

package org.gvsig.tools.exception;

import java.lang.reflect.Method;

import java.util.Iterator;

import java.util.Map;

/**

 * 

 * Esta clase esta pensada para actuar como clase base para las excepciones que

 * se lanzan dentro del proyecto de gvSIG.

 * 

 * A?ade la implementacion necesaria para disponer de mensajes de error

 * internacionalizables, a traves del metodo getLocalizedMessage, asi como una

 * serie de metodos que nos permiten obtener los mesanes de error de la cadena

 * de excepciones enlazadas a traves de su "causa", asi como utilidades que

 * permitan recorrer de forma comoda esta cadena de excepciones por medio de un

 * Iterador.

 * 

 * @author Equipo de desarrollo de gvSIG.

 * 

 */

public abstract class BaseException extends Exception implements IBaseException {

        private final static String BLANKS ="                                                                                                     ";

        private static IExceptionTranslator translator= null;

        protected String messageKey;

        /**

     * TODO: remove the variable, use the Exception get/setMessage() instead.

     */

        protected String formatString;

        /**

         * Unique code of error.

         */

        protected long code;

    /**

     * Empty constructor, don't use it anymore.

     * 

     * @deprecated

     */

    public BaseException() {

    }

    /**

     * Constructs a BaseException with a default message format, a key to find a

     * localized message format, and a unique code to identify the exception.

     * 

     * @param message

     *            the default messageFormat to describe the exception

     * @param key

     *            the key to use to search a localized messageFormnata

     * @param code

     *            the unique code to identify the exception

     */

    public BaseException(String message, String key, long code) {

        super(message);

        this.formatString = message;

        this.messageKey = key;

        this.code = code;

    }

    /**

     * Constructs a BaseException with a default message format, a key to find a

     * localized message format, and a unique code to identify the exception.

     * 

     * @param message

     *            the default messageFormat to describe the exception

     * @param cause

     *            the original cause of the exception

     * @param key

     *            the key to use to search a localized messageFormnata

     * @param code

     *            the unique code to identify the exception

     */

    public BaseException(String message, Throwable cause, String key, long code) {

        super(message, cause);

        this.formatString = message;

        this.messageKey = key;

        this.code = code;

    }

        /**

     * Returns the format string received in the parameter with its keys

     * replaced with the corresponding values of the map.

     * 

     * @param formatString

     * @param values

     *            map

     * @return string formatted

     */

    private String format(String formatString, Map values) {

        if (values != null) {

            // If there is no message format, create a text with the values.

            if (formatString == null) {

                return "values = ".concat(values.toString());

            } else {

                // Replace the keys as variables with the values in the Map

                Iterator keys = values.keySet().iterator();

                String message = formatString;

                while (keys.hasNext()) {

                    String key = (String) keys.next();

                    String varName = "%\\(".concat(key).concat("\\)");

                    message = message.replaceAll(varName, (String) values

                            .get(key));

                }

                return message;

            }

        }

        // Return the original format message in any other case

        return formatString;

    }

        /* (non-Javadoc)

         * @see java.lang.Throwable#getMessage()

         */

        public String getMessage() {

                return format(this.formatString, values());

        }

        /* (non-Javadoc)

         * @see org.gvsig.exceptions.IBaseException#getMessage(int)

         */

        public String getMessage(int indent) {

                return insertBlanksAtStart(format(formatString, values()),indent);

        }

        /* (non-Javadoc)

         * @see java.lang.Throwable#getLocalizedMessage()

         */

        public String getLocalizedMessage() {

                return getLocalizedMessage(translator,0);

        }

        /* (non-Javadoc)

         * @see org.gvsig.exceptions.IBaseException#getLocalizedMessage(org.gvsig.exceptions.IExceptionTranslator, int)

         */

        public String getLocalizedMessage(IExceptionTranslator translator, int indent){

                String fmt;

                if (translator == null){

                        translator = BaseException.translator;

                }

                if (translator == null){

                        fmt = getFormatString();

                } else {

                        fmt = getMessageKey();

                        if (fmt == null){

                                fmt = getFormatString();

                        } else {

                                fmt = translator.getText(fmt);

                        }

                }

                return insertBlanksAtStart(format(fmt,values()),indent);

        }

        /* (non-Javadoc)

         * @see org.gvsig.exceptions.IBaseException#getMessageStack()

         */

        public String getMessageStack() {

                return getMessageStack(0);

        }

        /* (non-Javadoc)

         * @see org.gvsig.exceptions.IBaseException#getMessageStack(int)

         */

        public String getMessageStack(int indent) {

                Iterator iter = this.iterator();

                StringBuffer msgBuffer = new StringBuffer();

                int i = 1;

                while (iter.hasNext()){

                    Exception ex = ((Exception) iter.next());

            if (msgBuffer.length() > 0) {

                msgBuffer.append("\n");

            }

                        if ( ex instanceof BaseException ) {

                                BaseException bex = (BaseException) ex;

                                msgBuffer.append(bex.getMessage(indent * i));

                        } else {

                            msgBuffer.append(insertBlanksAtStart(ex.getMessage(), indent

                        * i));

                        }

                        i++;

                }

                return msgBuffer.toString();

        }

        /* (non-Javadoc)

         * @see org.gvsig.exceptions.IBaseException#getLocalizedMessageStack()

         */

        public String getLocalizedMessageStack() {

                return getLocalizedMessageStack(BaseException.translator,0);

        }

        /* (non-Javadoc)

         * @see org.gvsig.exceptions.IBaseException#getLocalizedMessageStack(org.gvsig.exceptions.IExceptionTranslator, int)

         */

        public String getLocalizedMessageStack(IExceptionTranslator translator, int indent) {

                Iterator iter = this.iterator();

        StringBuffer msgBuffer = new StringBuffer();

        Exception ex;

        while (iter.hasNext()) {

            ex = ((Exception) iter.next());

            if (msgBuffer.length() > 0) {

                msgBuffer.append("\n");

            }

            if (ex instanceof BaseException) {

                BaseException bex = (BaseException) ex;

                msgBuffer.append(bex.getLocalizedMessage(translator, indent));

            } else {

                msgBuffer.append(ex.getLocalizedMessage());

            }

        }

        return msgBuffer.toString();

        }

        /**

         * Inserts blanks at the start of a string.

         *

         * @param str A string.

         * @param len Quantity of blanks to insert at the start of str.

         * @return A string compund by the quantity of blanks that

         *         len indicates and str.

         */

        static String insertBlanksAtStart(String str, int len){

        int blanksLen = len > BLANKS.length() ? BLANKS.length() : (len < 0 ? 0

                : len);

        return BLANKS.substring(0, blanksLen) + str;

        }

        /* (non-Javadoc)

         * @see org.gvsig.exceptions.IBaseException#getCode()

         */

        public long getCode() {

                return this.code;

        }

        /**

         * Sets the exception's code.

         */

        public void setCode(long code) {

                this.code = code;

        }

        /* (non-Javadoc)

         * @see org.gvsig.exceptions.IBaseException#getFormatString()

         */

        public String getFormatString() {

                return this.formatString;

        }

        /**

         * Sets the format string.

         *

         * @param formatString

         */

        public void setFormatString(String formatString) {

                this.formatString = formatString;

        }

        /* (non-Javadoc)

         * @see org.gvsig.exceptions.IBaseException#getMessageKey()

         */

        public String getMessageKey() {

                return this.messageKey;

        }

        /**

         * Sets the property messageKey.

         *

         * @param messageKey

         */

        public void setMessageKey(String messageKey) {

                this.messageKey = messageKey;

        }

        /* (non-Javadoc)

         * @see org.gvsig.exceptions.IBaseException#iterator()

         */

        public Iterator iterator() {

                return new BaseExceptionIterator(this);

        }

        /**

         * @return A map that serves to replace in the format string

         * the keys with the corresponding values.

         */

        abstract protected Map values();

        /**

         * Sets the property translator.

         * @param translator It(He,She) is used to translate

         *        the messages associated with the exceptions.

         */

        public static void setTranslator(IExceptionTranslator translator){

                BaseException.translator = translator;

        }

        public static void setTranslator(Object translator){

                BaseException.translator = new TranslatorWraper(translator);

        }

        public String toString(){

                return format(this.formatString, values());

        }

}

class TranslatorWraper implements IExceptionTranslator {

        private Object translator = null;

        private Method method = null;

        public TranslatorWraper(Object translator) {

                Class theClass = translator.getClass();

                String s = "";

                this.translator = translator;

                try {

                        method = theClass.getMethod("getText",new Class[] { s.getClass() });

                } catch (Exception e) {

                        throw new RuntimeException("El objeto translator suministrado no tiene el metodo getText apropiado.", e);

                }

        }

        public String getText(String key) {

                try {

                        return (String)(method.invoke(translator,new String[] { key }));

                } catch (Exception e) {

                        return key;

                }

        }

}