/*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.message;
/**
* This class represents a context of a parsing operation:
* <ul>
* <li>the current position the parsing operation is expected to start at</li>
* <li>the bounds limiting the scope of the parsing operation</li>
* </ul>
*
* @since 4.0
*/
public class
ParserCursor {
private final int
lowerBound;
private final int
upperBound;
private int
pos;
public
ParserCursor(final int
lowerBound, final int
upperBound) {
super();
if (
lowerBound < 0) {
throw new
IndexOutOfBoundsException("Lower bound cannot be negative");
}
if (
lowerBound >
upperBound) {
throw new
IndexOutOfBoundsException("Lower bound cannot be greater then upper bound");
}
this.
lowerBound =
lowerBound;
this.
upperBound =
upperBound;
this.
pos =
lowerBound;
}
public int
getLowerBound() {
return this.
lowerBound;
}
public int
getUpperBound() {
return this.
upperBound;
}
public int
getPos() {
return this.
pos;
}
public void
updatePos(final int
pos) {
if (
pos < this.
lowerBound) {
throw new
IndexOutOfBoundsException("pos: "+
pos+" < lowerBound: "+this.
lowerBound);
}
if (
pos > this.
upperBound) {
throw new
IndexOutOfBoundsException("pos: "+
pos+" > upperBound: "+this.
upperBound);
}
this.
pos =
pos;
}
public boolean
atEnd() {
return this.
pos >= this.
upperBound;
}
@
Override
public
String toString() {
final
StringBuilder buffer = new
StringBuilder();
buffer.
append('[');
buffer.
append(
Integer.
toString(this.
lowerBound));
buffer.
append('>');
buffer.
append(
Integer.
toString(this.
pos));
buffer.
append('>');
buffer.
append(
Integer.
toString(this.
upperBound));
buffer.
append(']');
return
buffer.
toString();
}
}