org.codehaus.plexus.util.cli.EnhancedStringTokenizer Maven / Gradle / Ivy
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A collection of various utility classes to ease working with strings, files, command lines, XML and more.
package org.codehaus.plexus.util.cli;
/*
* Copyright The Codehaus Foundation.
*
* Licensed 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.StringTokenizer;
/**
* The java.util.StringTokenizer is horribly broken. Given the string 1,,,3,,4 (, delim) It will return 1,3,4 Which is
* clearly wrong - 1,EMPTY,EMPTY,3,EMPTY,4 is what it should return
*
*
*/
public final class EnhancedStringTokenizer
{
private StringTokenizer cst = null;
String cdelim;
final boolean cdelimSingleChar;
final char cdelimChar;
boolean creturnDelims;
String lastToken = null;
boolean delimLast = true;
public EnhancedStringTokenizer( String str )
{
this( str, " \t\n\r\f", false );
}
public EnhancedStringTokenizer( String str, String delim )
{
this( str, delim, false );
}
public EnhancedStringTokenizer( String str, String delim, boolean returnDelims )
{
cst = new StringTokenizer( str, delim, true );
cdelim = delim;
creturnDelims = returnDelims;
cdelimSingleChar = ( delim.length() == 1 );
cdelimChar = delim.charAt( 0 );
}
public boolean hasMoreTokens()
{
return cst.hasMoreTokens();
}
private String internalNextToken()
{
if ( lastToken != null )
{
String last = lastToken;
lastToken = null;
return last;
}
String token = cst.nextToken();
if ( isDelim( token ) )
{
if ( delimLast )
{
lastToken = token;
return "";
}
else
{
delimLast = true;
return token;
}
}
else
{
delimLast = false;
return token;
}
}
public String nextToken()
{
String token = internalNextToken();
if ( creturnDelims )
{
return token;
}
if ( isDelim( token ) )
{
return hasMoreTokens() ? internalNextToken() : "";
}
else
{
return token;
}
}
private boolean isDelim( String str )
{
if ( str.length() == 1 )
{
char ch = str.charAt( 0 );
if ( cdelimSingleChar )
{
if ( cdelimChar == ch )
{
return true;
}
}
else
{
if ( cdelim.indexOf( ch ) >= 0 )
{
return true;
}
}
}
return false;
}
}