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https://codeberg.org/Mercury-IM/Smack
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Adding workgroup API (SMACK-185).
git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@7400 b35dd754-fafc-0310-a699-88a17e54d16e
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Matt Tucker
matt
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318
source/org/jivesoftware/smackx/workgroup/util/ModelUtil.java
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318
source/org/jivesoftware/smackx/workgroup/util/ModelUtil.java
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/**
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* $RCSfile$
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* $Revision: 38648 $
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* $Date: 2006-12-27 01:46:18 -0800 (Wed, 27 Dec 2006) $
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*
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* Copyright (C) 2004-2005 Jive Software. All rights reserved.
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*
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* This software is the proprietary information of Jive Software.
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* Use is subject to license terms.
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*/
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package org.jivesoftware.smackx.workgroup.util;
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import java.util.*;
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/**
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* Utility methods frequently used by data classes and design-time
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* classes.
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*/
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public final class ModelUtil {
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private ModelUtil() {
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// Prevents instantiation.
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}
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/**
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* This is a utility method that compares two objects when one or
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* both of the objects might be <CODE>null</CODE> The result of
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* this method is determined as follows:
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* <OL>
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* <LI>If <CODE>o1</CODE> and <CODE>o2</CODE> are the same object
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* according to the <CODE>==</CODE> operator, return
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* <CODE>true</CODE>.
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* <LI>Otherwise, if either <CODE>o1</CODE> or <CODE>o2</CODE> is
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* <CODE>null</CODE>, return <CODE>false</CODE>.
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* <LI>Otherwise, return <CODE>o1.equals(o2)</CODE>.
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* </OL>
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* <p/>
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* This method produces the exact logically inverted result as the
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* {@link #areDifferent(Object, Object)} method.<P>
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* <p/>
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* For array types, one of the <CODE>equals</CODE> methods in
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* {@link java.util.Arrays} should be used instead of this method.
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* Note that arrays with more than one dimension will require some
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* custom code in order to implement <CODE>equals</CODE> properly.
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*/
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public static final boolean areEqual(Object o1, Object o2) {
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if (o1 == o2) {
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return true;
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}
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else if (o1 == null || o2 == null) {
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return false;
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}
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else {
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return o1.equals(o2);
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}
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}
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/**
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* This is a utility method that compares two Booleans when one or
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* both of the objects might be <CODE>null</CODE> The result of
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* this method is determined as follows:
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* <OL>
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* <LI>If <CODE>b1</CODE> and <CODE>b2</CODE> are both TRUE or
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* neither <CODE>b1</CODE> nor <CODE>b2</CODE> is TRUE,
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* return <CODE>true</CODE>.
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* <LI>Otherwise, return <CODE>false</CODE>.
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* </OL>
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* <p/>
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*/
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public static final boolean areBooleansEqual(Boolean b1, Boolean b2) {
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// !jwetherb treat NULL the same as Boolean.FALSE
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return (b1 == Boolean.TRUE && b2 == Boolean.TRUE) ||
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(b1 != Boolean.TRUE && b2 != Boolean.TRUE);
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}
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/**
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* This is a utility method that compares two objects when one or
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* both of the objects might be <CODE>null</CODE>. The result
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* returned by this method is determined as follows:
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* <OL>
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* <LI>If <CODE>o1</CODE> and <CODE>o2</CODE> are the same object
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* according to the <CODE>==</CODE> operator, return
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* <CODE>false</CODE>.
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* <LI>Otherwise, if either <CODE>o1</CODE> or <CODE>o2</CODE> is
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* <CODE>null</CODE>, return <CODE>true</CODE>.
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* <LI>Otherwise, return <CODE>!o1.equals(o2)</CODE>.
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* </OL>
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* <p/>
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* This method produces the exact logically inverted result as the
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* {@link #areEqual(Object, Object)} method.<P>
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* <p/>
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* For array types, one of the <CODE>equals</CODE> methods in
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* {@link java.util.Arrays} should be used instead of this method.
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* Note that arrays with more than one dimension will require some
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* custom code in order to implement <CODE>equals</CODE> properly.
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*/
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public static final boolean areDifferent(Object o1, Object o2) {
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return !areEqual(o1, o2);
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}
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/**
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* This is a utility method that compares two Booleans when one or
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* both of the objects might be <CODE>null</CODE> The result of
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* this method is determined as follows:
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* <OL>
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* <LI>If <CODE>b1</CODE> and <CODE>b2</CODE> are both TRUE or
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* neither <CODE>b1</CODE> nor <CODE>b2</CODE> is TRUE,
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* return <CODE>false</CODE>.
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* <LI>Otherwise, return <CODE>true</CODE>.
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* </OL>
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* <p/>
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* This method produces the exact logically inverted result as the
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* {@link #areBooleansEqual(Boolean, Boolean)} method.<P>
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*/
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public static final boolean areBooleansDifferent(Boolean b1, Boolean b2) {
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return !areBooleansEqual(b1, b2);
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}
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/**
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* Returns <CODE>true</CODE> if the specified array is not null
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* and contains a non-null element. Returns <CODE>false</CODE>
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* if the array is null or if all the array elements are null.
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*/
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public static final boolean hasNonNullElement(Object[] array) {
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if (array != null) {
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final int n = array.length;
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for (int i = 0; i < n; i++) {
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if (array[i] != null) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Returns a single string that is the concatenation of all the
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* strings in the specified string array. A single space is
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* put between each string array element. Null array elements
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* are skipped. If the array itself is null, the empty string
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* is returned. This method is guaranteed to return a non-null
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* value, if no expections are thrown.
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*/
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public static final String concat(String[] strs) {
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return concat(strs, " "); //NOTRANS
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}
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/**
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* Returns a single string that is the concatenation of all the
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* strings in the specified string array. The strings are separated
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* by the specified delimiter. Null array elements are skipped. If
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* the array itself is null, the empty string is returned. This
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* method is guaranteed to return a non-null value, if no expections
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* are thrown.
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*/
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public static final String concat(String[] strs, String delim) {
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if (strs != null) {
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final StringBuilder buf = new StringBuilder();
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final int n = strs.length;
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for (int i = 0; i < n; i++) {
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final String str = strs[i];
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if (str != null) {
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buf.append(str).append(delim);
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}
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}
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final int length = buf.length();
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if (length > 0) {
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// Trim trailing space.
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buf.setLength(length - 1);
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}
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return buf.toString();
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}
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else {
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return ""; // NOTRANS
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}
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}
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/**
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* Returns <CODE>true</CODE> if the specified {@link String} is not
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* <CODE>null</CODE> and has a length greater than zero. This is
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* a very frequently occurring check.
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*/
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public static final boolean hasLength(String s) {
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return (s != null && s.length() > 0);
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}
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/**
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* Returns <CODE>null</CODE> if the specified string is empty or
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* <CODE>null</CODE>. Otherwise the string itself is returned.
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*/
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public static final String nullifyIfEmpty(String s) {
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return ModelUtil.hasLength(s) ? s : null;
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}
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/**
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* Returns <CODE>null</CODE> if the specified object is null
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* or if its <CODE>toString()</CODE> representation is empty.
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* Otherwise, the <CODE>toString()</CODE> representation of the
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* object itself is returned.
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*/
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public static final String nullifyingToString(Object o) {
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return o != null ? nullifyIfEmpty(o.toString()) : null;
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}
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/**
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* Determines if a string has been changed.
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*
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* @param oldString is the initial value of the String
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* @param newString is the new value of the String
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* @return true If both oldString and newString are null or if they are
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* both not null and equal to each other. Otherwise returns false.
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*/
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public static boolean hasStringChanged(String oldString, String newString) {
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if (oldString == null && newString == null) {
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return false;
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}
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else if ((oldString == null && newString != null)
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|| (oldString != null && newString == null)) {
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return true;
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}
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else {
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return !oldString.equals(newString);
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}
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}
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public static String getTimeFromLong(long diff) {
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final String HOURS = "h";
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final String MINUTES = "min";
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final String SECONDS = "sec";
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final long MS_IN_A_DAY = 1000 * 60 * 60 * 24;
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final long MS_IN_AN_HOUR = 1000 * 60 * 60;
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final long MS_IN_A_MINUTE = 1000 * 60;
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final long MS_IN_A_SECOND = 1000;
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Date currentTime = new Date();
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long numDays = diff / MS_IN_A_DAY;
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diff = diff % MS_IN_A_DAY;
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long numHours = diff / MS_IN_AN_HOUR;
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diff = diff % MS_IN_AN_HOUR;
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long numMinutes = diff / MS_IN_A_MINUTE;
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diff = diff % MS_IN_A_MINUTE;
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long numSeconds = diff / MS_IN_A_SECOND;
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diff = diff % MS_IN_A_SECOND;
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long numMilliseconds = diff;
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StringBuilder buf = new StringBuilder();
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if (numHours > 0) {
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buf.append(numHours + " " + HOURS + ", ");
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}
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if (numMinutes > 0) {
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buf.append(numMinutes + " " + MINUTES + ", ");
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}
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buf.append(numSeconds + " " + SECONDS);
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String result = buf.toString();
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return result;
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}
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/**
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* Build a List of all elements in an Iterator.
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*/
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public static List iteratorAsList(Iterator i) {
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ArrayList list = new ArrayList(10);
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while (i.hasNext()) {
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list.add(i.next());
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}
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return list;
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}
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/**
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* Creates an Iterator that is the reverse of a ListIterator.
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*/
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public static Iterator reverseListIterator(ListIterator i) {
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return new ReverseListIterator(i);
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}
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}
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/**
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* An Iterator that is the reverse of a ListIterator.
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*/
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class ReverseListIterator implements Iterator {
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private ListIterator _i;
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ReverseListIterator(ListIterator i) {
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_i = i;
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while (_i.hasNext())
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_i.next();
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}
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public boolean hasNext() {
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return _i.hasPrevious();
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}
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public Object next() {
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return _i.previous();
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}
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public void remove() {
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_i.remove();
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}
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}
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