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//
// ========================================================================
// Copyright (c) 1995-2016 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.websocket.common.util;
/**
* Collection of utility methods for Text content
*/
public final class TextUtil
{
/**
* Create a hint of what the text is like.
* <p>
* Used by logging and error messages to get a hint of what the text is like.
*
* @param text
* the text to abbreviate, quote, and generally give you a hint of what the value is.
* @return the abbreviated text
*/
public static String hint(String text)
{
if (text == null)
{
return "<null>";
}
return '"' + maxStringLength(30,text) + '"';
}
/**
* Smash a long string to fit within the max string length, by taking the middle section of the string and replacing them with an ellipsis "..."
* <p>
*
* <pre>
* Examples:
* .maxStringLength( 9, "Eatagramovabits") == "Eat...its"
* .maxStringLength(10, "Eatagramovabits") == "Eat...bits"
* .maxStringLength(11, "Eatagramovabits") == "Eata...bits"
* </pre>
*
* @param max
* the maximum size of the string (minimum size supported is 9)
* @param raw
* the raw string to smash
* @return the ellipsis'd version of the string.
*/
public static String maxStringLength(int max, String raw)
{
int length = raw.length();
if (length <= max)
{
// already short enough
return raw;
}
if (max < 9)
{
// minimum supported
return raw.substring(0,max);
}
StringBuilder ret = new StringBuilder();
int startLen = (int)Math.round((double)max / (double)3);
ret.append(raw.substring(0,startLen));
ret.append("...");
ret.append(raw.substring(length - (max - startLen - 3)));
return ret.toString();
}
}
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