/*
* 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.
*/
package org.apache.jena.atlas.lib;
/** Operations in someway related to XML */
public class XMLLib
{
/** Trim the XML whitespace characters strictly needed for whitespace facet collapse.
* This <b>not</b> full whitespace facet collapse, which also requires processing of
* internal spaces. Because none of the datatypes that have whitespace facet
* collapse and have values we extract can legally contain internal whitespace,
* we just need to trim the string.
*
* Java String.trim removes any characters less than 0x20.
*/
static String WScollapse(String string)
{
int len = string.length();
if ( len == 0 )
return string ;
if ( (string.charAt(0) > 0x20) && (string.charAt(len-1) > 0x20) )
return string ;
int idx1 = 0 ;
for ( ; idx1 < len ; idx1++ )
{
char ch = string.charAt(idx1) ;
if ( ! testForWS(ch) )
break ;
}
int idx2 = len-1 ;
for ( ; idx2 > idx1 ; idx2-- )
{
char ch = string.charAt(idx2) ;
if ( ! testForWS(ch) )
break ;
}
return string.substring(idx1, idx2+1) ;
}
private static boolean testForWS(char ch)
{
return ch == ' ' || ch == '\n' || ch == '\r' || ch == '\t' ;
}
}