org.apache.poi.ddf
Class EscherRecord

java.lang.Object
  org.apache.poi.ddf.EscherRecord

Direct Known Subclasses:

EscherBlipRecord, EscherBSERecord, EscherChildAnchorRecord, EscherClientAnchorRecord, EscherClientDataRecord, EscherContainerRecord, EscherDggRecord, EscherDgRecord, EscherOptRecord, EscherSpgrRecord, EscherSplitMenuColorsRecord, EscherSpRecord, EscherTextboxRecord, UnknownEscherRecord

public abstract class EscherRecord
extends java.lang.Object

The base abstract record from which all escher records are defined. Subclasses will need to define methods for serialization/deserialization and for determining the record size.

Author:

Glen Stampoultzis

Constructor Summary

EscherRecord()
Create a new instance

Method Summary

java.lang.Object	clone() Escher records may need to be clonable in the future.
void	display(java.io.PrintWriter w, int indent) The display methods allows escher variables to print the record names according to their hierarchy.
protected int	fillFields(byte[] data, EscherRecordFactory f) Delegates to fillFields(byte[], int, EscherRecordFactory)
abstract int	fillFields(byte[] data, int offset, EscherRecordFactory recordFactory) The contract of this method is to deserialize an escher record including it's children.
EscherRecord	getChild(int index) Returns the indexed child record.
java.util.List	getChildRecords()
short	getInstance() Returns the instance part of the option record.
short	getOptions()
short	getRecordId() Return the current record id.
abstract java.lang.String	getRecordName() Subclasses should return the short name for this escher record.
abstract int	getRecordSize() Subclasses should effeciently return the number of bytes required to serialize the record.
boolean	isContainerRecord() Determine whether this is a container record by inspecting the option field.
protected int	readHeader(byte[] data, int offset) Reads the 8 byte header information and populates the options and recordId records.
byte[]	serialize() Serializes to a new byte array.
int	serialize(int offset, byte[] data) Serializes to an existing byte array without serialization listener.
abstract int	serialize(int offset, byte[] data, EscherSerializationListener listener) Serializes the record to an existing byte array.
void	setChildRecords(java.util.List childRecords) Sets the child records for this record.
void	setOptions(short options) Set the options this this record.
void	setRecordId(short recordId) Sets the record id for this record.

Methods inherited from class java.lang.Object

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

Constructor Detail

EscherRecord

public EscherRecord()

Create a new instance

Method Detail

fillFields

protected int fillFields(byte[] data,
                         EscherRecordFactory f)

Delegates to fillFields(byte[], int, EscherRecordFactory)

See Also:

fillFields(byte[], int, org.apache.poi.ddf.EscherRecordFactory)

fillFields

public abstract int fillFields(byte[] data,
                               int offset,
                               EscherRecordFactory recordFactory)

The contract of this method is to deserialize an escher record including it's children.

Parameters:

data - The byte array containing the serialized escher records.

offset - The offset into the byte array.

recordFactory - A factory for creating new escher records.

Returns:

The number of bytes written.

readHeader

protected int readHeader(byte[] data,
                         int offset)

Reads the 8 byte header information and populates the options and recordId records.

Parameters:

data - the byte array to read from

offset - the offset to start reading from

Returns:

the number of bytes remaining in this record. This may include the children if this is a container.

isContainerRecord

public boolean isContainerRecord()

Determine whether this is a container record by inspecting the option field.

Returns:

true is this is a container field.

getOptions

public short getOptions()

Returns:

The options field for this record. All records have one.

setOptions

public void setOptions(short options)

Set the options this this record. Container records should have the last nibble set to 0xF.

serialize

public byte[] serialize()

Serializes to a new byte array. This is done by delegating to serialize(int, byte[]);

Returns:

the serialized record.

See Also:

serialize(int, byte[])

serialize

public int serialize(int offset,
                     byte[] data)

Serializes to an existing byte array without serialization listener. This is done by delegating to serialize(int, byte[], EscherSerializationListener).

Parameters:

offset - the offset within the data byte array.

data - the data array to serialize to.

Returns:

The number of bytes written.

See Also:

serialize(int, byte[], org.apache.poi.ddf.EscherSerializationListener)

serialize

public abstract int serialize(int offset,
                              byte[] data,
                              EscherSerializationListener listener)

Serializes the record to an existing byte array.

Parameters:

offset - the offset within the byte array

data - the data array to serialize to

listener - a listener for begin and end serialization events. This is useful because the serialization is hierarchical/recursive and sometimes you need to be able break into that.

Returns:

the number of bytes written.

getRecordSize

public abstract int getRecordSize()

Subclasses should effeciently return the number of bytes required to serialize the record.

Returns:

number of bytes

getRecordId

public short getRecordId()

Return the current record id.

Returns:

The 16 bit record id.

setRecordId

public void setRecordId(short recordId)

Sets the record id for this record.

getChildRecords

public java.util.List getChildRecords()

Returns:

Returns the children of this record. By default this will be an empty list. EscherCotainerRecord is the only record that may contain children.

See Also:

EscherContainerRecord

setChildRecords

public void setChildRecords(java.util.List childRecords)

Sets the child records for this record. By default this will throw an exception as only EscherContainerRecords may have children.

Parameters:

childRecords - Not used in base implementation.

clone

public java.lang.Object clone()

Escher records may need to be clonable in the future.

Overrides:

clone in class java.lang.Object

getChild

public EscherRecord getChild(int index)

Returns the indexed child record.

display

public void display(java.io.PrintWriter w,
                    int indent)

The display methods allows escher variables to print the record names according to their hierarchy.

Parameters:

w - The print writer to output to.

indent - The current indent level.

getRecordName

public abstract java.lang.String getRecordName()

Subclasses should return the short name for this escher record.

getInstance

public short getInstance()

Returns the instance part of the option record.

Returns:

The instance part of the record