[6785] | 1 | /**************************************************************** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one * |
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| 3 | * or more contributor license agreements. See the NOTICE file * |
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| 4 | * distributed with this work for additional information * |
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| 5 | * regarding copyright ownership. The ASF licenses this file * |
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| 6 | * to you under the Apache License, Version 2.0 (the * |
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| 7 | * "License"); you may not use this file except in compliance * |
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| 8 | * with the License. You may obtain a copy of the License at * |
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| 9 | * * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 * |
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| 11 | * * |
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| 12 | * Unless required by applicable law or agreed to in writing, * |
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| 13 | * software distributed under the License is distributed on an * |
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| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
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| 15 | * KIND, either express or implied. See the License for the * |
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| 16 | * specific language governing permissions and limitations * |
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| 17 | * under the License. * |
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| 18 | ****************************************************************/ |
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| 19 | |
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| 20 | package org.apache.james.mime4j.stream; |
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| 21 | |
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| 22 | /** |
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| 23 | * This class represents a context of a parsing operation: |
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| 24 | * <ul> |
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| 25 | * <li>the current position the parsing operation is expected to start at</li> |
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| 26 | * <li>the bounds limiting the scope of the parsing operation</li> |
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| 27 | * </ul> |
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| 28 | * <p/> |
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| 29 | * Copied from Apache HttpCore project |
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| 30 | */ |
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| 31 | class ParserCursor { |
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| 32 | |
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| 33 | private final int lowerBound; |
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| 34 | private final int upperBound; |
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| 35 | private int pos; |
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| 36 | |
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| 37 | public ParserCursor(int lowerBound, int upperBound) { |
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| 38 | super(); |
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| 39 | if (lowerBound < 0) { |
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| 40 | throw new IndexOutOfBoundsException("Lower bound cannot be negative"); |
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| 41 | } |
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| 42 | if (lowerBound > upperBound) { |
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| 43 | throw new IndexOutOfBoundsException("Lower bound cannot be greater then upper bound"); |
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| 44 | } |
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| 45 | this.lowerBound = lowerBound; |
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| 46 | this.upperBound = upperBound; |
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| 47 | this.pos = lowerBound; |
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| 48 | } |
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| 49 | |
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| 50 | public int getLowerBound() { |
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| 51 | return this.lowerBound; |
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| 52 | } |
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| 53 | |
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| 54 | public int getUpperBound() { |
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| 55 | return this.upperBound; |
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| 56 | } |
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| 57 | |
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| 58 | public int getPos() { |
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| 59 | return this.pos; |
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| 60 | } |
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| 61 | |
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| 62 | public void updatePos(int pos) { |
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| 63 | if (pos < this.lowerBound) { |
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| 64 | throw new IndexOutOfBoundsException("pos: "+pos+" < lowerBound: "+this.lowerBound); |
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| 65 | } |
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| 66 | if (pos > this.upperBound) { |
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| 67 | throw new IndexOutOfBoundsException("pos: "+pos+" > upperBound: "+this.upperBound); |
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| 68 | } |
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| 69 | this.pos = pos; |
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| 70 | } |
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| 71 | |
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| 72 | public boolean atEnd() { |
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| 73 | return this.pos >= this.upperBound; |
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| 74 | } |
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| 75 | |
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| 76 | public String toString() { |
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| 77 | StringBuilder buffer = new StringBuilder(); |
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| 78 | buffer.append('['); |
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| 79 | buffer.append(Integer.toString(this.lowerBound)); |
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| 80 | buffer.append('>'); |
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| 81 | buffer.append(Integer.toString(this.pos)); |
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| 82 | buffer.append('>'); |
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| 83 | buffer.append(Integer.toString(this.upperBound)); |
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| 84 | buffer.append(']'); |
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| 85 | return buffer.toString(); |
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| 86 | } |
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| 87 | |
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| 88 | } |
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