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/*
* ====================================================================
* 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 ch.boye.httpclientandroidlib.message;
import ch.boye.httpclientandroidlib.annotation.NotThreadSafe;
/**
* 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
*/
@NotThreadSafe
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();
}
}
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