Application: gvSIG desktop » Library: org.gvsig.tools

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License as published by the Free Software

 * Foundation; either version 2 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 Public License for more

 * details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program; if not, write to the Free Software Foundation, Inc., 51

 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us at info AT

 * gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.tools.dataTypes.impl.coercion;

import java.text.NumberFormat;

import java.text.ParsePosition;

import java.util.Date;

import java.util.Locale;

import org.apache.commons.lang3.ArrayUtils;

import org.apache.commons.lang3.StringUtils;

import org.gvsig.tools.dataTypes.CoercionException;

import org.gvsig.tools.dataTypes.DataTypesManager.CoercionWithLocale;

public class CoerceToDouble implements CoercionWithLocale {

    public Object coerce(Object value) throws CoercionException {

        if (value == null) {

            return null;

        }

        try {

            if (!(value instanceof Double)) {

                if (value instanceof Number) {

                    value = ((Number) value).doubleValue();

                } else if( value instanceof Boolean ) {

                    return (double)((boolean)value ? 1:0);

                } else if (value instanceof Date) {

                    value = (double)(((Date)value).getTime());

                } else {

                    String s = value.toString();

                    if (s == null) {

                        return null;

                    }

                    s = s.trim().toLowerCase();

                    if (s.length() == 0) {

                        return null;

                    }

                    if (s.startsWith("0x")) {

                        value = new Double(Long.parseLong(s.substring(2), 16));

                    } else {

                        value = Double.valueOf(s);

                    }

                }

            }

            return value;

        } catch (Exception e) {

            throw new CoercionException(e);

        }

    }

    public Object coerce(Object value, Locale locale) throws CoercionException {

        if (value == null) {

            return null;

        }

        try {

            if (!(value instanceof Double)) {

                if (value instanceof Number) {

                    value = ((Number) value).doubleValue();

                } else if( value instanceof Boolean ) {

                    return (double)((boolean)value ? 1:0);

                } else if (value instanceof Date) {

                    value = (double)(((Date)value).getTime());

                } else {

                    String s = value.toString().trim().toLowerCase();

                    if( StringUtils.isBlank(s) ) {

                        return null;

                    }

                    if (s.startsWith("0x")) {

                        value = new Double(Long.parseLong(s.substring(2), 16));

                    } else {

                        if( locale == null ) {

                            locale = Locale.getDefault();

                        }

                        if( s.startsWith("+") ) {

                            s = s.substring(1);

                        }

                        ParsePosition p = new ParsePosition(0);

                        NumberFormat nf = NumberFormat.getInstance(locale);

                        Number num = nf.parse(s, p);

                        if (p.getErrorIndex() > 0 || p.getIndex() < s.length()) {

                            throw new CoercionException("Can't coerce '"+s+"' to double with locale " + (locale==null?"null":locale.getLanguage()) + "(error index "+p.getErrorIndex()+", index "+p.getIndex()+").");

                        }

                        value = new Double(num.doubleValue());

                    }

                }

            }

            return value;

        } catch (CoercionException e) {

            throw e;

        } catch (Exception e) {

            throw new CoercionException("Can't coerce '"+(value==null?"null":value.toString())+"' to double with locale " + (locale==null?"null":locale.getLanguage())+"'.",e);

        }

    }

}