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MessageHelper.java
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MessageHelper.java
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package org.apache.maven.internal;
/*
* 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.
*/
import java.util.ArrayList;
import java.util.List;
/**
* Helper class to format warning messages to the console
*/
public class MessageHelper
{
private static final int DEFAULT_MAX_SIZE = 65;
private static final char BOX_CHAR = '*';
public static String separatorLine()
{
StringBuilder sb = new StringBuilder( DEFAULT_MAX_SIZE );
repeat( sb, '*', DEFAULT_MAX_SIZE );
return sb.toString();
}
public static List<String> formatWarning( String... lines )
{
int size = DEFAULT_MAX_SIZE;
int rem = size - 4; // 4 chars = 2 box_char + 2 spaces
List<String> result = new ArrayList<>();
StringBuilder sb = new StringBuilder( size );
// first line
sb.setLength( 0 );
repeat( sb, BOX_CHAR, size );
result.add( sb.toString() );
// lines
for ( String line : lines )
{
sb.setLength( 0 );
String[] words = line.split( " " );
for ( String word : words )
{
if ( sb.length() >= rem - word.length() - ( sb.length() > 0 ? 1 : 0 ) )
{
repeat( sb, ' ', rem - sb.length() );
result.add( BOX_CHAR + " " + sb + " " + BOX_CHAR );
sb.setLength( 0 );
}
if ( sb.length() > 0 )
{
sb.append( ' ' );
}
sb.append( word );
}
while ( sb.length() < rem )
{
sb.append( ' ' );
}
result.add( BOX_CHAR + " " + sb + " " + BOX_CHAR );
}
// last line
sb.setLength( 0 );
repeat( sb, BOX_CHAR, size );
result.add( sb.toString() );
return result;
}
private static void repeat( StringBuilder sb, char c, int nb )
{
for ( int i = 0; i < nb; i++ )
{
sb.append( c );
}
}
}