org.jaudiotagger.tag.id3
Class ID3v1TagField

java.lang.Object
  org.jaudiotagger.tag.id3.ID3v1TagField

All Implemented Interfaces:

TagField, TagTextField

public class ID3v1TagField
extends java.lang.Object
implements TagTextField

This class encapsulates the name and content of a tag entry in id3 fields

Author:

@author Raphael Slinckx (KiKiDonK), Christian Laireiter (liree)

Field Summary

private boolean	common If true, the id of the current encapsulated tag field is specified as a common field.
private java.lang.String	content Stores the content of the tag field.
private java.lang.String	id Stores the id (name) of the tag field.

Constructor Summary

ID3v1TagField(byte[] raw)
Creates an instance.

ID3v1TagField(java.lang.String fieldId, java.lang.String fieldContent)
Creates an instance.

Method Summary

private void	checkCommon() This method examines the ID of the current field and modifies commonin order to reflect if the tag id is a commonly used one.
protected void	copy(byte[] src, byte[] dst, int dstOffset) This method will copy all bytes of src to dst at the specified location.
void	copyContent(TagField field) This method copies the data of the given field to the current data.
java.lang.String	getContent() Returns the content of the field.
java.lang.String	getEncoding() Returns the current used charset encoding.
java.lang.String	getId() Returns the Id of the represented tag field. This value should uniquely identify a kind of tag data, like title.
byte[]	getRawContent() This method delivers the binary representation of the fields data in order to be directly written to the file.
boolean	isBinary() Determines whether the represented field contains (is made up of) binary data, instead of text data. Software can identify fields to be displayed because they are human readable if this method returns false.
void	isBinary(boolean b) This method will set the field to represent binary data. Some implementations may support conversions. As of now (Octobre 2005) there is no implementation really using this method to perform useful operations.
boolean	isCommon() Identifies a field to be of common use. Some software may differ between common and not common fields.
boolean	isEmpty() Determines whether the content of the field is empty.
void	setContent(java.lang.String s) Sets the content of the field.
void	setEncoding(java.lang.String s) Sets the charset encoding used by the field.
java.lang.String	toString() This method returns a human readable description of the fields contents. For text fields it should be the text itself.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

common

private boolean common

If true, the id of the current encapsulated tag field is specified as a common field.
Example is "ARTIST" which should be interpreted by any application as the artist of the media content.
Will be set during construction with checkCommon().

content

private java.lang.String content

Stores the content of the tag field.

id

private java.lang.String id

Stores the id (name) of the tag field.

Constructor Detail

ID3v1TagField

public ID3v1TagField(byte[] raw)
              throws java.io.UnsupportedEncodingException

Creates an instance.

Parameters:

raw - Raw byte data of the tagfield.

Throws:

java.io.UnsupportedEncodingException - If the data doesn't conform "UTF-8" specification.

ID3v1TagField

public ID3v1TagField(java.lang.String fieldId,
                     java.lang.String fieldContent)

Creates an instance.

Parameters:

fieldId - ID (name) of the field.

fieldContent - Content of the field.

Method Detail

checkCommon

private void checkCommon()

This method examines the ID of the current field and modifies commonin order to reflect if the tag id is a commonly used one.

copy

protected void copy(byte[] src,
                    byte[] dst,
                    int dstOffset)

This method will copy all bytes of src to dst at the specified location.

Parameters:

src - bytes to copy.

dst - where to copy to.

dstOffset - at which position of dst the data should be copied.

copyContent

public void copyContent(TagField field)

Description copied from interface: TagField

This method copies the data of the given field to the current data.

Specified by:

copyContent in interface TagField

Parameters:

field - The field containing the data to be taken.

See Also:

TagField.copyContent(TagField)

getContent

public java.lang.String getContent()

Description copied from interface: TagTextField

Returns the content of the field.

Specified by:

getContent in interface TagTextField

Returns:

Content

See Also:

TagTextField.getContent()

getEncoding

public java.lang.String getEncoding()

Description copied from interface: TagTextField

Returns the current used charset encoding.

Specified by:

getEncoding in interface TagTextField

Returns:

Charset encoding.

See Also:

TagTextField.getEncoding()

getId

public java.lang.String getId()

Description copied from interface: TagField

Returns the Id of the represented tag field.
This value should uniquely identify a kind of tag data, like title. AbstractTag will use the "id" to summarize multiple fields.

Specified by:

getId in interface TagField

Returns:

Unique identifier for the fields type. (title, artist...)

See Also:

TagField.getId()

getRawContent

public byte[] getRawContent()
                     throws java.io.UnsupportedEncodingException

Description copied from interface: TagField

This method delivers the binary representation of the fields data in order to be directly written to the file.

Specified by:

getRawContent in interface TagField

Returns:

Binary data representing the current tag field.

Throws:

java.io.UnsupportedEncodingException - Most tag data represents text. In some cases the underlying implementation will need to convert the text data in java to a specific charset encoding. In these cases an UnsupportedEncodingException may occur.

See Also:

TagField.getRawContent()

isBinary

public boolean isBinary()

Description copied from interface: TagField

Determines whether the represented field contains (is made up of) binary data, instead of text data.
Software can identify fields to be displayed because they are human readable if this method returns false.

Specified by:

isBinary in interface TagField

Returns:

true if field represents binary data (not human readable).

See Also:

TagField.isBinary()

isBinary

public void isBinary(boolean b)

Description copied from interface: TagField

This method will set the field to represent binary data.

Some implementations may support conversions.
As of now (Octobre 2005) there is no implementation really using this method to perform useful operations.

Specified by:

isBinary in interface TagField

Parameters:

b - true, if the field contains binary data. //@deprecated As for now is of no use. Implementations should use another // way of setting this property.

See Also:

TagField.isBinary(boolean)

isCommon

public boolean isCommon()

Description copied from interface: TagField

Identifies a field to be of common use.

Some software may differ between common and not common fields. A common one is for sure the title field. A web link may not be of common use for tagging. However some file formats, or future development of users expectations will make more fields common than now can be known.

Specified by:

isCommon in interface TagField

Returns:

true if the field is of common use.

See Also:

TagField.isCommon()

isEmpty

public boolean isEmpty()

Description copied from interface: TagField

Determines whether the content of the field is empty.

Specified by:

isEmpty in interface TagField

Returns:

true if no data is stored (or empty String).

See Also:

TagField.isEmpty()

setContent

public void setContent(java.lang.String s)

Description copied from interface: TagTextField

Sets the content of the field.

Specified by:

setContent in interface TagTextField

Parameters:

s - fields content.

See Also:

TagTextField.setContent(String)

setEncoding

public void setEncoding(java.lang.String s)

Description copied from interface: TagTextField

Sets the charset encoding used by the field.

Specified by:

setEncoding in interface TagTextField

Parameters:

s - charset.

See Also:

TagTextField.setEncoding(String)

toString

public java.lang.String toString()

Description copied from interface: TagField

This method returns a human readable description of the fields contents.
For text fields it should be the text itself. Other fields containing images may return a formatted string with image properties like width, height and so on.

Specified by:

toString in interface TagField

Overrides:

toString in class java.lang.Object

Returns:

Description of the fields content.