| 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 ObjectNumberFixedLength extends AbstractMP3Object { |
| 13 | |
| 14 | int length = 0; |
| 15 | |
| 16 | /** |
| 17 | * Creates a new ObjectNumberFixedLength object. |
| 18 | */ |
| 19 | public ObjectNumberFixedLength(final String identifier, final int size) { |
| 20 | if (size < 0) { |
| 21 | throw new IllegalArgumentException("Length is less than zero: " + this.length); |
| 22 | } |
| 23 | this.length = size; |
| 24 | this.identifier = identifier; |
| 25 | } |
| 26 | |
| 27 | /** |
| 28 | * Creates a new ObjectNumberFixedLength object. |
| 29 | */ |
| 30 | public ObjectNumberFixedLength(final ObjectNumberFixedLength copyObject) { |
| 31 | super(copyObject); |
| 32 | this.length = copyObject.length; |
| 33 | } |
| 34 | |
| 35 | public int getLength() { |
| 36 | return this.length; |
| 37 | } |
| 38 | |
| 39 | public void setSize(final int length) { |
| 40 | if (length > 0) { |
| 41 | this.length = length; |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | public int getSize() { |
| 46 | return this.length; |
| 47 | } |
| 48 | |
| 49 | public boolean equals(final Object obj) { |
| 50 | if ((obj instanceof ObjectNumberFixedLength) == false) { |
| 51 | return false; |
| 52 | } |
| 53 | final ObjectNumberFixedLength objectNumberFixedLength = (ObjectNumberFixedLength) obj; |
| 54 | if (this.length != objectNumberFixedLength.length) { |
| 55 | return false; |
| 56 | } |
| 57 | return super.equals(obj); |
| 58 | } |
| 59 | |
| 60 | public void readByteArray(final byte[] arr, final int offset) { |
| 61 | if (arr == null) { |
| 62 | throw new NullPointerException("Byte array is null"); |
| 63 | } |
| 64 | if ((offset < 0) || (offset >= arr.length)) { |
| 65 | throw new IndexOutOfBoundsException("Offset to byte array is out of bounds: offset = " + |
| 66 | offset + |
| 67 | ", array.length = " + |
| 68 | arr |
| 69 | .length); |
| 70 | } |
| 71 | long lvalue = 0; |
| 72 | for (int i = offset; i < (offset + this.length); i++) { |
| 73 | lvalue <<= 8; |
| 74 | lvalue += arr[i]; |
| 75 | } |
| 76 | this.value = new Long(lvalue); |
| 77 | } |
| 78 | |
| 79 | public void readString(final String str, final int offset) { |
| 80 | if (str == null) { |
| 81 | throw new NullPointerException("Number string is null"); |
| 82 | } |
| 83 | if ((offset < 0) || (offset >= str.length())) { |
| 84 | throw new IndexOutOfBoundsException("Offset to number string is out of bounds: offset = " + |
| 85 | offset + |
| 86 | ", string.length()" + |
| 87 | str.length()); |
| 88 | } |
| 89 | this.value = Long.getLong(str.substring(offset)); |
| 90 | } |
| 91 | |
| 92 | public String toString() { |
| 93 | if (this.value == null) { |
| 94 | return ""; |
| 95 | } |
| 96 | return this.value.toString(); |
| 97 | } |
| 98 | |
| 99 | public byte[] writeByteArray() { |
| 100 | final byte[] arr; |
| 101 | arr = new byte[this.length]; |
| 102 | if (this.value != null) { |
| 103 | long temp = TagUtility.getWholeNumber(this.value); |
| 104 | for (int i = this.length - 1; i >= 0; i--) { |
| 105 | arr[i] = (byte) (temp & 0xFF); |
| 106 | temp >>= 8; |
| 107 | } |
| 108 | } |
| 109 | return arr; |
| 110 | } |
| 111 | |
| 112 | public String writeString() { |
| 113 | if (this.value == null) { |
| 114 | return String.valueOf(new char[this.length]); |
| 115 | } |
| 116 | return this.value.toString(); |
| 117 | } |
| 118 | } |