| /**************************************************************** |
| * 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 org.apache.james.mime4j.stream; |
| |
| /** |
| * 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> |
| * <p/> |
| * Copied from Apache HttpCore project |
| */ |
| public 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("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; |
| } |
| |
| public String toString() { |
| 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(); |
| } |
| |
| } |