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/*
 * Copyright (c) 2010. The Codehaus. All Rights Reserved.
 *
 *   Licensed 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.codehaus.httpcache4j.util;

/**
 * This class represents a context of a parsing operation:
 * 
 *  the current position the parsing operation is expected to start at
 *  the bounds limiting the scope of the parsing operation
 * 
 * 
 */
class ParserCursor {

    private final int lowerBound;
    private final int upperBound;
    private int pos;

    public ParserCursor(int lowerBound, 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(int pos) {
        if (pos < this.lowerBound) {
            throw new IndexOutOfBoundsException();
        }
        if (pos > this.upperBound) {
            throw new IndexOutOfBoundsException();
        }
        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();
    }

}