info.dmtree
Class DmtData

java.lang.Object
  info.dmtree.DmtData

public final class DmtData
extends java.lang.Object

An immutable data structure representing the contents of a leaf or interior node. This structure represents only the value and the format property of the node, all other properties (like MIME type) can be set and read using the DmtSession interface.

Different constructors are available to create nodes with different formats. Nodes of null format can be created using the static NULL_VALUE constant instance of this class.

FORMAT_RAW_BINARY and FORMAT_RAW_STRING enable the support of future data formats. When using these formats, the actual format name is specified as a String. The application is responsible for the proper encoding of the data according to the specified format.

Field Summary

static int	FORMAT_BASE64 The node holds an OMA DM b64 value.
static int	FORMAT_BINARY The node holds an OMA DM bin value.
static int	FORMAT_BOOLEAN The node holds an OMA DM bool value.
static int	FORMAT_DATE The node holds an OMA DM date value.
static int	FORMAT_FLOAT The node holds an OMA DM float value.
static int	FORMAT_INTEGER The node holds an OMA DM int value.
static int	FORMAT_NODE Format specifier of an internal node.
static int	FORMAT_NULL The node holds an OMA DM null value.
static int	FORMAT_RAW_BINARY The node holds raw protocol data encoded in binary format.
static int	FORMAT_RAW_STRING The node holds raw protocol data encoded as String.
static int	FORMAT_STRING The node holds an OMA DM chr value.
static int	FORMAT_TIME The node holds an OMA DM time value.
static int	FORMAT_XML The node holds an OMA DM xml value.
static DmtData	NULL_VALUE Constant instance representing a leaf node of null format.

Constructor Summary

DmtData(boolean bool)
Create a DmtData instance of bool format and set its value.

DmtData(byte[] bytes)
Create a DmtData instance of bin format and set its value.

DmtData(byte[] bytes, boolean base64)
Create a DmtData instance of bin or b64 format and set its value.

DmtData(float flt)
Create a DmtData instance of float format and set its value.

DmtData(int integer)
Create a DmtData instance of int format and set its value.

DmtData(java.lang.Object complex)
Create a DmtData instance of node format with the given object value.

DmtData(java.lang.String str)
Create a DmtData instance of chr format with the given string value.

DmtData(java.lang.String formatName, byte[] data)
Create a DmtData instance in FORMAT_RAW_BINARY format.

DmtData(java.lang.String value, int format)
Create a DmtData instance of the specified format and set its value based on the given string.

DmtData(java.lang.String formatName, java.lang.String data)
Create a DmtData instance in FORMAT_RAW_STRING format.

Method Summary

boolean	equals(java.lang.Object obj) Compares the specified object with this DmtData instance.
byte[]	getBase64() Gets the value of a node with base 64 (b64) format.
byte[]	getBinary() Gets the value of a node with binary (bin) format.
boolean	getBoolean() Gets the value of a node with boolean (bool) format.
java.lang.String	getDate() Gets the value of a node with date format.
float	getFloat() Gets the value of a node with float format.
int	getFormat() Get the node's format, expressed in terms of type constants defined in this class.
java.lang.String	getFormatName() Returns the format of this DmtData as String.
int	getInt() Gets the value of a node with integer (int) format.
java.lang.Object	getNode() Gets the complex data associated with an interior node (node format).
byte[]	getRawBinary() Gets the value of a node in raw binary (FORMAT_RAW_BINARY) format.
java.lang.String	getRawString() Gets the value of a node in raw String (FORMAT_RAW_STRING) format.
int	getSize() Get the size of the data.
java.lang.String	getString() Gets the value of a node with string (chr) format.
java.lang.String	getTime() Gets the value of a node with time format.
java.lang.String	getXml() Gets the value of a node with xml format.
int	hashCode() Returns the hash code value for this DmtData instance.
java.lang.String	toString() Gets the string representation of the DmtData.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

FORMAT_INTEGER

public static final int FORMAT_INTEGER

The node holds an OMA DM int value.

See Also:

Constant Field Values

FORMAT_FLOAT

public static final int FORMAT_FLOAT

The node holds an OMA DM float value.

See Also:

Constant Field Values

FORMAT_STRING

public static final int FORMAT_STRING

The node holds an OMA DM chr value.

See Also:

Constant Field Values

FORMAT_BOOLEAN

public static final int FORMAT_BOOLEAN

The node holds an OMA DM bool value.

See Also:

Constant Field Values

FORMAT_DATE

public static final int FORMAT_DATE

The node holds an OMA DM date value.

See Also:

Constant Field Values

FORMAT_TIME

public static final int FORMAT_TIME

The node holds an OMA DM time value.

See Also:

Constant Field Values

FORMAT_BINARY

public static final int FORMAT_BINARY

The node holds an OMA DM bin value. The value of the node corresponds to the Java byte[] type.

See Also:

Constant Field Values

FORMAT_BASE64

public static final int FORMAT_BASE64

The node holds an OMA DM b64 value. Like FORMAT_BINARY, this format is also represented by the Java byte[] type, the difference is only in the corresponding OMA DM format.

See Also:

Constant Field Values

FORMAT_XML

public static final int FORMAT_XML

The node holds an OMA DM xml value.

See Also:

Constant Field Values

FORMAT_NULL

public static final int FORMAT_NULL

The node holds an OMA DM null value. This corresponds to the Java null type.

See Also:

Constant Field Values

FORMAT_NODE

public static final int FORMAT_NODE

Format specifier of an internal node. An interior node can hold a Java object as value (see DmtData(Object) and getNode()). This value can be used by Java programs that know a specific URI understands the associated Java type. This type is further used as a return value of the MetaNode.getFormat() method for interior nodes.

See Also:

Constant Field Values

FORMAT_RAW_STRING

public static final int FORMAT_RAW_STRING

The node holds raw protocol data encoded as String. The getFormatName() method can be used to get the actual format name.

See Also:

Constant Field Values

FORMAT_RAW_BINARY

public static final int FORMAT_RAW_BINARY

The node holds raw protocol data encoded in binary format. The getFormatName() method can be used to get the actual format name.

See Also:

Constant Field Values

NULL_VALUE

public static final DmtData NULL_VALUE

Constant instance representing a leaf node of null format.

Constructor Detail

DmtData

public DmtData(java.lang.String str)

Create a DmtData instance of chr format with the given string value. The null string argument is valid.

Parameters:

str - the string value to set

DmtData

public DmtData(java.lang.Object complex)

Create a DmtData instance of node format with the given object value. The value represents complex data associated with an interior node.

Certain interior nodes can support access to their subtrees through such complex values, making it simpler to retrieve or update all leaf nodes in a subtree.

The given value must be a non-null immutable object.

Parameters:

complex - the complex data object to set

DmtData

public DmtData(java.lang.String value,
               int format)

Create a DmtData instance of the specified format and set its value based on the given string. Only the following string-based formats can be created using this constructor:

• FORMAT_STRING - value can be any string
• FORMAT_XML - value must contain an XML fragment (the validity is not checked by this constructor)
• FORMAT_DATE - value must be parseable to an ISO 8601 calendar date in complete representation, basic format (pattern CCYYMMDD)
• FORMAT_TIME - value must be parseable to an ISO 8601 time of day in either local time, complete representation, basic format (pattern hhmmss) or Coordinated Universal Time, basic format (pattern hhmmssZ)

The null string argument is only valid if the format is string or XML.

Parameters:

value - the string, XML, date or time value to set

format - the format of the DmtData instance to be created, must be one of the formats specified above

Throws:

java.lang.IllegalArgumentException - if format is not one of the allowed formats, or value is not a valid string for the given format

java.lang.NullPointerException - if a date or time is constructed and value is null

DmtData

public DmtData(int integer)

Create a DmtData instance of int format and set its value.

Parameters:

integer - the integer value to set

DmtData

public DmtData(float flt)

Create a DmtData instance of float format and set its value.

Parameters:

flt - the float value to set

DmtData

public DmtData(boolean bool)

Create a DmtData instance of bool format and set its value.

Parameters:

bool - the boolean value to set

DmtData

public DmtData(byte[] bytes)

Create a DmtData instance of bin format and set its value.

Parameters:

bytes - the byte array to set, must not be null

Throws:

java.lang.NullPointerException - if bytes is null

DmtData

public DmtData(byte[] bytes,
               boolean base64)

Create a DmtData instance of bin or b64 format and set its value. The chosen format is specified by the base64 parameter.

Parameters:

bytes - the byte array to set, must not be null

base64 - if true, the new instance will have b64 format, if false, it will have bin format

Throws:

java.lang.NullPointerException - if bytes is null

DmtData

public DmtData(java.lang.String formatName,
               java.lang.String data)

Create a DmtData instance in FORMAT_RAW_STRING format. The data is provided encoded as a String. The actual data format is specified in formatName. The encoding used in data must conform to this format.

Parameters:

formatName - the name of the format, must not be null

data - the data encoded according to the specified format, must not be null

Throws:

java.lang.NullPointerException - if formatName or data is null

DmtData

public DmtData(java.lang.String formatName,
               byte[] data)

Create a DmtData instance in FORMAT_RAW_BINARY format. The data is provided encoded as binary. The actual data format is specified in formatName. The encoding used in data must conform to this format.

Parameters:

formatName - the name of the format, must not be null

data - the data encoded according to the specified format, must not be null

Throws:

java.lang.NullPointerException - if formatName or data is null

Method Detail

getString

public java.lang.String getString()

Gets the value of a node with string (chr) format.

Returns:

the string value

Throws:

DmtIllegalStateException - if the format of the node is not string

getDate

public java.lang.String getDate()

Gets the value of a node with date format. The returned date string is formatted according to the ISO 8601 definition of a calendar date in complete representation, basic format (pattern CCYYMMDD).

Returns:

the date value

Throws:

DmtIllegalStateException - if the format of the node is not date

getTime

public java.lang.String getTime()

Gets the value of a node with time format. The returned time string is formatted according to the ISO 8601 definition of the time of day. The exact format depends on the value the object was initialized with: either local time, complete representation, basic format (pattern hhmmss) or Coordinated Universal Time, basic format (pattern hhmmssZ).

Returns:

the time value

Throws:

DmtIllegalStateException - if the format of the node is not time

getXml

public java.lang.String getXml()

Gets the value of a node with xml format.

Returns:

the XML value

Throws:

DmtIllegalStateException - if the format of the node is not xml

getInt

public int getInt()

Gets the value of a node with integer (int) format.

Returns:

the integer value

Throws:

DmtIllegalStateException - if the format of the node is not integer

getFloat

public float getFloat()

Gets the value of a node with float format.

Returns:

the float value

Throws:

DmtIllegalStateException - if the format of the node is not float

getBoolean

public boolean getBoolean()

Gets the value of a node with boolean (bool) format.

Returns:

the boolean value

Throws:

DmtIllegalStateException - if the format of the node is not boolean

getBinary

public byte[] getBinary()

Gets the value of a node with binary (bin) format.

Returns:

the binary value

Throws:

DmtIllegalStateException - if the format of the node is not binary

getRawBinary

public byte[] getRawBinary()

Gets the value of a node in raw binary (FORMAT_RAW_BINARY) format.

Returns:

the data value in raw binary format

Throws:

DmtIllegalStateException - if the format of the node is not raw binary

getRawString

public java.lang.String getRawString()

Gets the value of a node in raw String (FORMAT_RAW_STRING) format.

Returns:

the data value in raw String format

Throws:

DmtIllegalStateException - if the format of the node is not raw String

getBase64

public byte[] getBase64()

Gets the value of a node with base 64 (b64) format.

Returns:

the binary value

Throws:

DmtIllegalStateException - if the format of the node is not base 64.

getNode

public java.lang.Object getNode()

Gets the complex data associated with an interior node (node format).

Certain interior nodes can support access to their subtrees through complex values, making it simpler to retrieve or update all leaf nodes in the subtree.

Returns:

the data object associated with an interior node

Throws:

DmtIllegalStateException - if the format of the data is not node

getFormat

public int getFormat()

Get the node's format, expressed in terms of type constants defined in this class. Note that the 'format' term is a legacy from OMA DM, it is more customary to think of this as 'type'.

Returns:

the format of the node

getFormatName

public java.lang.String getFormatName()

Returns the format of this DmtData as String. For the predefined data formats this is the OMA DM defined name of the format. For FORMAT_RAW_STRING and FORMAT_RAW_BINARY this is the format specified when the object was created.

Returns:

the format name as String

getSize

public int getSize()

Get the size of the data. The returned value depends on the format of data in the node:

• FORMAT_STRING, FORMAT_XML, FORMAT_BINARY, FORMAT_BASE64, FORMAT_RAW_STRING, and FORMAT_RAW_BINARY: the length of the stored data, or 0 if the data is null
• FORMAT_INTEGER and FORMAT_FLOAT: 4
• FORMAT_DATE and FORMAT_TIME: the length of the date or time in its string representation
• FORMAT_BOOLEAN: 1
• FORMAT_NODE: -1 (unknown)
• FORMAT_NULL: 0

Returns:

the size of the data stored by this object

toString

public java.lang.String toString()

Gets the string representation of the DmtData. This method works for all formats.

For string format data - including FORMAT_RAW_STRING - the string value itself is returned, while for XML, date, time, integer, float, boolean and node formats the string form of the value is returned. Binary - including FORMAT_RAW_BINARY - and base64 data is represented by two-digit hexadecimal numbers for each byte separated by spaces. The NULL_VALUE data has the string form of "null". Data of string or XML format containing the Java null value is represented by an empty string.

Overrides:

toString in class java.lang.Object

Returns:

the string representation of this DmtData instance

equals

public boolean equals(java.lang.Object obj)

Compares the specified object with this DmtData instance. Two DmtData objects are considered equal if their format is the same, and their data (selected by the format) is equal.

In case of FORMAT_RAW_BINARY and FORMAT_RAW_STRING the textual name of the data format - as returned by getFormatName() - must be equal as well.

Overrides:

equals in class java.lang.Object

Parameters:

obj - the object to compare with this DmtData

Returns:

true if the argument represents the same DmtData as this object

hashCode

public int hashCode()

Returns the hash code value for this DmtData instance. The hash code is calculated based on the data (selected by the format) of this object.

Overrides:

hashCode in class java.lang.Object

Returns:

the hash code value for this object