com.ibatis.common.Objects Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jbatis Show documentation
The jBATIS persistence framework will help you to significantly reduce the amount of Java code that you normally need to access a relational database. iBATIS simply maps JavaBeans to SQL statements using a very simple XML descriptor.
The newest version!
/*-
 * Copyright 2012 Owl Group
 * All rights reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 */

package com.ibatis.common;

import java.io.IOException;
import java.util.Calendar;
import java.util.Date;

/**
 * Objects for internal use only
 * 
 * Date: 2014-10-27,10:09:35 +0800
 * 
 * @author Song Sun
 * @version 1.0
 */
public final class Objects {

    final Object[] array;

    Objects(Object ... args) {
        array = args;
    }

    public int hashCode() {
        int hashCode = 1;
        if (array != null) {
            for (Object o : array) {
                hashCode = 31 * hashCode + (o == null ? 0 : o.hashCode());
            }
        }
        return hashCode;
    }

    public boolean equals(Object o) {
        if (o == this)
            return true;
        if (o instanceof Objects) {
            Objects os = (Objects) o;
            if (array == os.array) {
                return true;
            }
            if (array == null || os.array == null) {
                return false;
            }
            if (array.length != os.array.length) {
                return false;
            }
            for (int i = array.length - 1; i > 0; i--) {
                Object o1 = array[i];
                Object o2 = os.array[i];
                if (!(o1 == null ? o2 == null : o1.equals(o2)))
                    return false;
            }
            return true;
        }

        return false;
    }

    /**
     * Helps to avoid using {@code @SuppressWarnings( "unchecked"})} when casting to a generic type.
     */
    @SuppressWarnings("unchecked")
    public static  T uncheckedCast(Object obj) {
        return (T) obj;
    }

    public static Object getKey(Object... args) {
        return new Objects(args);
    }

    public static int indexOf(StringBuilder buf, char delim, int from) {
        boolean inQuote = false;
        for (int i = from; i < buf.length(); i++) {
            char c = buf.charAt(i);
            if (inQuote) {
                if (c == '\'') {
                    inQuote = false;
                }
            } else {
                if (c == delim) {
                    return i;
                } else if (c == '\'') {
                    inQuote = true;
                }
            }
        }
        return -1;
    }

    /**
     * Append date object with format 'yyyy-MM-dd HH:mm:ss'
     */
    public static void outputDate(Appendable a, Date d) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(d.getTime());
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH) + 1;
        int day = calendar.get(Calendar.DAY_OF_MONTH);
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);
        int second = calendar.get(Calendar.SECOND);
        try {
            a.append('\'');
            padInt(year, 4, a);
            a.append('-');
            padInt(month, 2, a);
            a.append('-');
            padInt(day, 2, a);
            a.append(' ');
            padInt(hour, 2, a);
            a.append(':');
            padInt(minute, 2, a);
            a.append(':');
            padInt(second, 2, a);
            a.append('\'');
        } catch (IOException e) {
        }
    }

    static void padInt(int val, int width, Appendable buf) throws IOException {
        if (val < 0) {
            val = 0;
        }
        String s = Integer.toString(val);
        if (s.length() > width) {
            s = s.substring(s.length() - width);
        }
        for (int j = width - s.length(); j > 0; j--) {
            buf.append('0');
        }
        buf.append(s);
    }
}