| 1 | /* This file is part of the project "Hilbert II" - http://www.qedeq.org |
| 2 | * |
| 3 | * Copyright 2000-2014, Michael Meyling <mime@qedeq.org>. |
| 4 | * |
| 5 | * "Hilbert II" is free software; you can redistribute |
| 6 | * it and/or modify it under the terms of the GNU General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | package org.qedeq.base.io; |
| 17 | |
| 18 | |
| 19 | /** |
| 20 | * Wraps a text output stream. |
| 21 | * |
| 22 | * @author Michael Meyling |
| 23 | */ |
| 24 | public class SubTextInput extends TextInput { |
| 25 | |
| 26 | /** Absolute start of this input relative to base {@link SubTextInput}. */ |
| 27 | private final int absoluteStart; |
| 28 | |
| 29 | /** Absolute end of this input relative to base {@link SubTextInput}. */ |
| 30 | private final int absoluteEnd; |
| 31 | |
| 32 | /** |
| 33 | * Constructor. |
| 34 | * |
| 35 | * @param source Text input. |
| 36 | */ |
| 37 | public SubTextInput(final String source) { |
| 38 | super(source); |
| 39 | this.absoluteStart = 0; |
| 40 | this.absoluteEnd = source.length(); |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * Constructor. |
| 45 | * |
| 46 | * @param original Parent input. |
| 47 | * @param absoluteStart Input part starts here. |
| 48 | * @param absoluteEnd Input part ends here. |
| 49 | */ |
| 50 | public SubTextInput(final SubTextInput original, final int absoluteStart, final int absoluteEnd) { |
| 51 | super(original.getAbsoluteSubstring(absoluteStart, absoluteEnd)); |
| 52 | this.absoluteStart = absoluteStart; |
| 53 | this.absoluteEnd = absoluteEnd; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * Get the absolute start position of the current {@link SubTextInput}. |
| 58 | * |
| 59 | * @return Absolute start position. |
| 60 | */ |
| 61 | public int getAbsoluteStart() { |
| 62 | return absoluteStart; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Get the absolute end position of the current {@link SubTextInput}. |
| 67 | * |
| 68 | * @return Absolute end position. |
| 69 | */ |
| 70 | public int getAbsoluteEnd() { |
| 71 | return absoluteEnd; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Get the absolute position of the current position. |
| 76 | * |
| 77 | * @return Absolute position of current position. |
| 78 | */ |
| 79 | public int getAbsolutePosition() { |
| 80 | return getAbsoluteStart() + getPosition(); |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Set the current position by calculating the relative position |
| 85 | * from the given absolute position. |
| 86 | * |
| 87 | * @param absolutePosition This should be the absolute position. |
| 88 | */ |
| 89 | public void setAbsolutePosition(final int absolutePosition) { |
| 90 | setPosition(absolutePosition - getAbsoluteStart()); |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Get sub string of source. The given parameters have values for the underlying original |
| 95 | * SubTextInput at the base. |
| 96 | * |
| 97 | * @param absoluteFrom Absolute start of sub string. |
| 98 | * @param absoluteTo Absolute end of sub string. |
| 99 | * @return Sub string. |
| 100 | */ |
| 101 | public String getAbsoluteSubstring(final int absoluteFrom, final int absoluteTo) { |
| 102 | return getSubstring(absoluteFrom - getAbsoluteStart(), absoluteTo - getAbsoluteStart()); |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * Get sub string of source as a new {@link SubTextInput}. The given parameters have |
| 107 | * values for the underlying original SubTextInput at the base. |
| 108 | * |
| 109 | * @param absoluteFrom Absolute start of sub string. |
| 110 | * @param absoluteTo Absolute end of sub string. |
| 111 | * @return Sub string. |
| 112 | */ |
| 113 | public SubTextInput getSubTextInput(final int absoluteFrom, final int absoluteTo) { |
| 114 | return new SubTextInput(this, absoluteFrom, absoluteTo); |
| 115 | } |
| 116 | |
| 117 | } |