org.eclipse.jetty.start.Utils Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.start;
import java.util.Collection;
public final class Utils
{
public static String join(Object[] arr, String delim)
{
if (arr == null)
{
return "";
}
return join(arr,0,arr.length,delim);
}
public static String join(Object[] arr, int start, int end, String delim)
{
if (arr == null)
{
return "";
}
StringBuilder str = new StringBuilder();
for (int i = start; i < end; i++)
{
if (i > start)
{
str.append(delim);
}
str.append(arr[i]);
}
return str.toString();
}
public static String join(Collection objs, String delim)
{
if (objs == null)
{
return "";
}
StringBuilder str = new StringBuilder();
boolean needDelim = false;
for (Object obj : objs)
{
if (needDelim)
{
str.append(delim);
}
str.append(obj);
needDelim = true;
}
return str.toString();
}
/**
* Is String null, empty, or consisting of only whitespace.
*
* @param value
* the value to test
* @return true if null, empty, or consisting of only whitespace
*/
public static boolean isBlank(String value)
{
if (value == null)
{
return true;
}
int len = value.length();
for (int i = 0; i < len; i++)
{
int c = value.codePointAt(i);
if (!Character.isWhitespace(c))
{
return false;
}
}
return true;
}
/**
* Is String valid and has something other than whitespace
*
* @param value
* the value to test
* @return true if String has something other than whitespace
*/
public static boolean isNotBlank(String value)
{
if (value == null)
{
return false;
}
int len = value.length();
for (int i = 0; i < len; i++)
{
int c = value.codePointAt(i);
if (!Character.isWhitespace(c))
{
return true;
}
}
return false;
}
}