/*
 * ====================================================================
 * 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.hc.core5.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();
    }

}

@@ -1221,16 +1221,55 @@
 ssage;%0A%0A
+import org.apache.hc.core5.util.Args;%0A%0A
 /**%0A * T
@@ -1727,134 +1727,70 @@
     
-if (lowerBound %3C 0) %7B%0A            throw new IndexOutOfBoundsException(%22L
+Args.notNegative(lowerBound, %22l
 ower
- b
+B
 ound
- cannot be negative%22);%0A        %7D%0A        if 
+%22);%0A        Args.check
 (low
@@ -1797,17 +1797,18 @@
 erBound 
-%3E
+%3C=
  upperBo
@@ -1814,68 +1814,17 @@
 ound
-) %7B%0A            throw new IndexOutOfBoundsException(%22L
+, %22l
 ower
- b
+B
 ound
@@ -1848,26 +1848,25 @@
 r th
-e
+a
 n upper
- b
+B
 ound%22);%0A
     
@@ -1861,26 +1861,16 @@
 ound%22);%0A
-        %7D%0A
         

Use Args for argument check