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OkHttp Digest Authentication

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/*
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * 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 com.burgstaller.okhttp.digest.fromhttpclient;

public class ParserCursor {
    private final int lowerBound;
    private final int upperBound;
    private int pos;

    public ParserCursor(int lowerBound, int upperBound) {
        if(lowerBound < 0) {
            throw new IndexOutOfBoundsException("Lower bound cannot be negative");
        } else if(lowerBound > upperBound) {
            throw new IndexOutOfBoundsException("Lower bound cannot be greater then upper bound");
        } else {
            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(int pos) {
        if(pos < this.lowerBound) {
            throw new IndexOutOfBoundsException();
        } else if(pos > this.upperBound) {
            throw new IndexOutOfBoundsException();
        } else {
            this.pos = pos;
        }
    }

    public boolean atEnd() {
        return this.pos >= this.upperBound;
    }

    public String toString() {
        StringBuilder buffer = new StringBuilder(16);
        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();
    }
}