/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
/**
* Various string manipulation methods that are more efficient then chaining
* string operations: all is done in the same buffer without creating a bunch of
* string objects.
*
* @author Dungeon Project
*/
public class Main {
/**
* Truncates large Strings showing a portion of the String's head and tail
* with the center cut out and replaced with '...'. Also displays the total
* length of the truncated string so size of '...' can be interpreted.
* Useful for large strings in UIs or hex dumps to log files.
*
* @param str
* the string to truncate
* @param head
* the amount of the head to display
* @param tail
* the amount of the tail to display
* @return the center truncated string
*/
public static final String centerTrunc( String str, int head, int tail )
{
StringBuffer buf = null;
// Return as-is if String is smaller than or equal to the head plus the
// tail plus the number of characters added to the trunc representation
// plus the number of digits in the string length.
if ( str.length() <= ( head + tail + 7 + str.length() / 10 ) )
{
return str;
}
buf = new StringBuffer();
buf.append( '[' ).append( str.length() ).append( "][" );
buf.append( str.substring( 0, head ) ).append( "..." );
buf.append( str.substring( str.length() - tail ) );
buf.append( ']' );
return buf.toString();
}
}