org.farng.mp3.object.ObjectNumberVariableLength Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of jid3lib Show documentation

This library reads song information, such as song title, artist, and album, from an MP3 file. It supports ID3v1, ID3v1.1, Lyrics3v1, Lyrics3v2, ID3v2.2, ID3v2.3, and ID3v2.4 tags. MP3 Frame Headers can also be read. There is a FilenameTag, a ID3v2.4 tag that is intelligently derived from the file name. It contains tag synchronization utilities, multiple save options, and easy tag conversion methods.

The newest version!

package org.farng.mp3.object;

import org.farng.mp3.TagUtility;

/**
 * ID3v2 and Lyrics3v2 tags have individual fields AbstractMP3Fragments Then each fragment is broken down
 * in to individual AbstractMP3Objects
 *
 * @author Eric Farng
 * @version $Revision: 1.5 $
 */
public class ObjectNumberVariableLength extends AbstractMP3Object {

    int minLength = 1;

    /**
     * Creates a new ObjectNumberVariableLength object.
     */
    public ObjectNumberVariableLength(final String identifier, final int minimumSize) {
        this.identifier = identifier;
        if (minimumSize > 0) {
            this.minLength = minimumSize;
        }
    }

    /**
     * Creates a new ObjectNumberVariableLength object.
     */
    public ObjectNumberVariableLength(final ObjectNumberVariableLength copyObject) {
        super(copyObject);
        this.minLength = copyObject.minLength;
    }

    public int getMaximumLenth() {
        return 8;
    }

    public int getMinimumLength() {
        return this.minLength;
    }

    public void setMinimumSize(final int minimumSize) {
        if (minimumSize > 0) {
            this.minLength = minimumSize;
        }
    }

    public int getSize() {
        if (this.value == null) {
            return 0;
        }
        int current;
        long temp = TagUtility.getWholeNumber(this.value);
        int size = 0;
        for (int i = 1; i <= 8; i++) {
            current = (byte) temp & 0xFF;
            if (current != 0) {
                size = i;
            }
            temp >>= 8;
        }
        return (this.minLength > size) ? this.minLength : size;
    }

    public boolean equals(final Object obj) {
        if ((obj instanceof ObjectNumberVariableLength) == false) {
            return false;
        }
        final ObjectNumberVariableLength objectNumberVariableLength = (ObjectNumberVariableLength) obj;
        if (this.minLength != objectNumberVariableLength.minLength) {
            return false;
        }
        return super.equals(obj);
    }

    public void readByteArray(final byte[] arr, final int offset) {
        if (arr == null) {
            throw new NullPointerException("Byte array is null");
        }
        if ((offset < 0) || (offset >= arr.length)) {
            throw new IndexOutOfBoundsException("Offset to byte array is out of bounds: offset = " +
                                                offset +
                                                ", array.length = " +
                                                arr
                                                        .length);
        }
        long lvalue = 0;
        for (int i = offset; i < arr.length; i++) {
            lvalue <<= 8;
            lvalue += arr[i];
        }
        this.value = new Long(lvalue);
    }

    public void readString(final String str, final int offset) {
        if (str == null) {
            throw new NullPointerException("Number string is null");
        }
        if ((offset < 0) || (offset >= str.length())) {
            throw new IndexOutOfBoundsException("Offset to number string is out of bounds: offset = " +
                                                offset +
                                                ", string.length()" +
                                                str.length());
        }
        this.value = Long.getLong(str.substring(offset));
    }

    public String toString() {
        if (this.value == null) {
            return "";
        }
        return this.value.toString();
    }

    public byte[] writeByteArray() {
        final int size = getSize();
        final byte[] arr;
        if (size == 0) {
            arr = new byte[0];
        } else {
            long temp = TagUtility.getWholeNumber(this.value);
            arr = new byte[size];
            for (int i = size - 1; i >= 0; i--) {
                arr[i] = (byte) (temp & 0xFF);
                temp >>= 8;
            }
        }
        return arr;
    }

    public String writeString() {
        if (this.value == null) {
            return "";
        }
        return this.value.toString();
    }
}