| 1 | package org.farng.mp3.object; |
| 2 | |
| 3 | import org.farng.mp3.TagUtility; |
| 4 | |
| 5 | /** |
| 6 | * ID3v2 and Lyrics3v2 tags have individual fields <code>AbstractMP3Fragment</code>s Then each fragment is broken down |
| 7 | * in to individual <code>AbstractMP3Object</code>s |
| 8 | * |
| 9 | * @author Eric Farng |
| 10 | * @version $Revision: 1.5 $ |
| 11 | */ |
| 12 | public class ObjectNumberVariableLength extends AbstractMP3Object { |
| 13 | |
| 14 | int minLength = 1; |
| 15 | |
| 16 | /** |
| 17 | * Creates a new ObjectNumberVariableLength object. |
| 18 | */ |
| 19 | public ObjectNumberVariableLength(final String identifier, final int minimumSize) { |
| 20 | this.identifier = identifier; |
| 21 | if (minimumSize > 0) { |
| 22 | this.minLength = minimumSize; |
| 23 | } |
| 24 | } |
| 25 | |
| 26 | /** |
| 27 | * Creates a new ObjectNumberVariableLength object. |
| 28 | */ |
| 29 | public ObjectNumberVariableLength(final ObjectNumberVariableLength copyObject) { |
| 30 | super(copyObject); |
| 31 | this.minLength = copyObject.minLength; |
| 32 | } |
| 33 | |
| 34 | public int getMaximumLenth() { |
| 35 | return 8; |
| 36 | } |
| 37 | |
| 38 | public int getMinimumLength() { |
| 39 | return this.minLength; |
| 40 | } |
| 41 | |
| 42 | public void setMinimumSize(final int minimumSize) { |
| 43 | if (minimumSize > 0) { |
| 44 | this.minLength = minimumSize; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | public int getSize() { |
| 49 | if (this.value == null) { |
| 50 | return 0; |
| 51 | } |
| 52 | int current; |
| 53 | long temp = TagUtility.getWholeNumber(this.value); |
| 54 | int size = 0; |
| 55 | for (int i = 1; i <= 8; i++) { |
| 56 | current = (byte) temp & 0xFF; |
| 57 | if (current != 0) { |
| 58 | size = i; |
| 59 | } |
| 60 | temp >>= 8; |
| 61 | } |
| 62 | return (this.minLength > size) ? this.minLength : size; |
| 63 | } |
| 64 | |
| 65 | public boolean equals(final Object obj) { |
| 66 | if ((obj instanceof ObjectNumberVariableLength) == false) { |
| 67 | return false; |
| 68 | } |
| 69 | final ObjectNumberVariableLength objectNumberVariableLength = (ObjectNumberVariableLength) obj; |
| 70 | if (this.minLength != objectNumberVariableLength.minLength) { |
| 71 | return false; |
| 72 | } |
| 73 | return super.equals(obj); |
| 74 | } |
| 75 | |
| 76 | public void readByteArray(final byte[] arr, final int offset) { |
| 77 | if (arr == null) { |
| 78 | throw new NullPointerException("Byte array is null"); |
| 79 | } |
| 80 | if ((offset < 0) || (offset >= arr.length)) { |
| 81 | throw new IndexOutOfBoundsException("Offset to byte array is out of bounds: offset = " + |
| 82 | offset + |
| 83 | ", array.length = " + |
| 84 | arr |
| 85 | .length); |
| 86 | } |
| 87 | long lvalue = 0; |
| 88 | for (int i = offset; i < arr.length; i++) { |
| 89 | lvalue <<= 8; |
| 90 | lvalue += arr[i]; |
| 91 | } |
| 92 | this.value = new Long(lvalue); |
| 93 | } |
| 94 | |
| 95 | public void readString(final String str, final int offset) { |
| 96 | if (str == null) { |
| 97 | throw new NullPointerException("Number string is null"); |
| 98 | } |
| 99 | if ((offset < 0) || (offset >= str.length())) { |
| 100 | throw new IndexOutOfBoundsException("Offset to number string is out of bounds: offset = " + |
| 101 | offset + |
| 102 | ", string.length()" + |
| 103 | str.length()); |
| 104 | } |
| 105 | this.value = Long.getLong(str.substring(offset)); |
| 106 | } |
| 107 | |
| 108 | public String toString() { |
| 109 | if (this.value == null) { |
| 110 | return ""; |
| 111 | } |
| 112 | return this.value.toString(); |
| 113 | } |
| 114 | |
| 115 | public byte[] writeByteArray() { |
| 116 | final int size = getSize(); |
| 117 | final byte[] arr; |
| 118 | if (size == 0) { |
| 119 | arr = new byte[0]; |
| 120 | } else { |
| 121 | long temp = TagUtility.getWholeNumber(this.value); |
| 122 | arr = new byte[size]; |
| 123 | for (int i = size - 1; i >= 0; i--) { |
| 124 | arr[i] = (byte) (temp & 0xFF); |
| 125 | temp >>= 8; |
| 126 | } |
| 127 | } |
| 128 | return arr; |
| 129 | } |
| 130 | |
| 131 | public String writeString() { |
| 132 | if (this.value == null) { |
| 133 | return ""; |
| 134 | } |
| 135 | return this.value.toString(); |
| 136 | } |
| 137 | } |