/**
* 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.hadoop.gateway.filter.rewrite.impl.form;
import java.io.IOException;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
public class FormReader {
private static final String DEFFAULT_FORM_ENCODING = "UTF-8";
private static final int DEFAULT_BUFFER_SIZE = 1024;
private Reader reader;
private FormPair current;
private StringBuilder buffer;
private int sepIndex;
public FormReader( Reader reader ) {
this.reader = reader;
this.current = null;
this.buffer = new StringBuilder( DEFAULT_BUFFER_SIZE );
this.sepIndex = -1;
}
public FormPair getNextPair() throws IOException {
while( true ) {
int c = reader.read();
switch( c ) {
case '=':
sepIndex = buffer.length();
break;
case '&':
// Ignore adjacent &s.
if( buffer.length() == 0 ) {
sepIndex = -1;
continue;
} else {
return createCurrentPair();
}
case -1:
// Ignore adjacent &s.
if( buffer.length() == 0 ) {
sepIndex = -1;
return null;
} else {
return createCurrentPair();
}
default:
buffer.append( (char)c );
break;
}
}
}
private FormPair createCurrentPair() throws UnsupportedEncodingException {
String name;
String value;
if( sepIndex >= 0 ) {
name = buffer.substring( 0, sepIndex );
value = buffer.substring( sepIndex );
} else {
name = buffer.toString();
value = "";
}
name = URLDecoder.decode( name, DEFFAULT_FORM_ENCODING );
value = URLDecoder.decode( value, DEFFAULT_FORM_ENCODING );
FormPair pair = new FormPair( name, value );
current = pair;
buffer.setLength( 0 );
sepIndex = -1;
return pair;
}
public FormPair getCurrentPair() {
return current;
}
}