com.bstek.dorado.core.el.ExpressionUtilsObject.java Source code

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Here is the source code for com.bstek.dorado.core.el.ExpressionUtilsObject.java

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/*
 * This file is part of Dorado 7.x (http://dorado7.bsdn.org).
 * 
 * Copyright (c) 2002-2012 BSTEK Corp. All rights reserved.
 * 
 * This file is dual-licensed under the AGPLv3 (http://www.gnu.org/licenses/agpl-3.0.html) 
 * and BSDN commercial (http://www.bsdn.org/licenses) licenses.
 * 
 * If you are unsure which license is appropriate for your use, please contact the sales department
 * at http://www.bstek.com/contact.
 */

package com.bstek.dorado.core.el;

import java.text.DecimalFormat;
import java.util.Calendar;

import org.apache.commons.lang.StringUtils;

import com.bstek.dorado.core.Constants;
import com.bstek.dorado.util.DateUtils;

/**
 * @author Benny Bao (mailto:benny.bao@bstek.com)
 * @since 2010-12-24
 */
public class ExpressionUtilsObject {

    public java.util.Date getDate() {
        return new Date();
    }

    public String getDate(String format) {
        return formatDate(new Date(), format);
    }

    public String formatDate(java.util.Date date, String format) {
        return DateUtils.format(format, date);
    }

    public java.util.Date getToday() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime();
    }

    public java.util.Date calculateDate(String expression) {
        return calculateDate(new java.util.Date(), expression);
    }

    public java.util.Date calculateDate(java.util.Date date, String expression) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);

        if (StringUtils.isNotBlank(expression)) {
            char fieldChar = 0;
            int field = 0, offset = 0;
            boolean offsetFound = false;
            StringBuffer numText = new StringBuffer();
            for (int i = 0, len = expression.length(); i < len; i++) {
                char c = expression.charAt(i);
                if (c == ' ' || c == ',' || c == ';') {
                    if (field != 0) {
                        if (numText.length() == 0) {
                            throw new IllegalArgumentException(
                                    "Argument missed for Date field \"" + fieldChar + "\".");
                        }

                        int num = Integer.parseInt(numText.toString());
                        if (offset == 0) {
                            calendar.set(field, num);
                        } else {
                            calendar.add(field, num * offset);
                        }
                    }

                    fieldChar = 0;
                    field = 0;
                    offset = 0;
                    offsetFound = false;
                    numText.setLength(0);
                } else if (field == 0) {
                    switch (c) {
                    case 'y':
                    case 'Y':
                        field = Calendar.YEAR;
                        break;
                    case 'M':
                        field = Calendar.MONTH;
                        break;
                    case 'd':
                        field = Calendar.DAY_OF_MONTH;
                        break;
                    case 'h':
                    case 'H':
                        field = Calendar.HOUR_OF_DAY;
                        break;
                    case 'm':
                        field = Calendar.MINUTE;
                        break;
                    case 's':
                        field = Calendar.SECOND;
                        break;
                    case 'z':
                    case 'Z':
                        field = Calendar.MILLISECOND;
                        break;
                    default:
                        throw new IllegalArgumentException("Unknown Date field \"" + c + "\".");
                    }
                    fieldChar = c;
                } else if (!offsetFound && numText.length() == 0) {
                    if (c == '+') {
                        offset = 1;
                        offsetFound = true;
                    } else if (c == '-') {
                        offset = -1;
                        offsetFound = true;
                    }
                } else if (c >= '0' && c <= '9') {
                    numText.append(c);
                }
            }

            if (field != 0) {
                if (numText.length() == 0) {
                    throw new IllegalArgumentException("Argument missed for Date field \"" + fieldChar + "\".");
                }

                int num = Integer.parseInt(numText.toString());
                if (offset == 0) {
                    calendar.set(field, num);
                } else {
                    calendar.add(field, num * offset);
                }
            }
        }

        return calendar.getTime();
    }

    public String formatNumber(Number d, String format) {
        return new DecimalFormat(format).format(d);
    }

    public String trim(String s) {
        return StringUtils.trim(s);
    }

    public Object defaultValue(Object value, Object defaultValue) {
        if (value == null || (value instanceof String && value.equals(""))
                || (value instanceof Number && ((Number) value).doubleValue() == 0)
                || (value instanceof Boolean && !((Boolean) value).booleanValue())) {
            return defaultValue;
        }
        return value;
    }

}

class Date extends java.util.Date {
    private static final long serialVersionUID = 4952841582905835573L;

    public Date() {
        super();
    }

    public Date(long l) {
        super(l);
    }

    @Override
    public String toString() {
        return DateUtils.format(Constants.ISO_DATETIME_FORMAT1, this);
    }

}