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## org.apache.poi.hpsf
Class ClassID

    java.lang.Object
      org.apache.poi.hpsf.ClassID

    public class ClassID

extends java.lang.Object

Represents a class ID (16 bytes). Unlike other little-endian type the `ClassID` is not just 16 bytes stored in the wrong order. Instead, it is a double word (4 bytes) followed by two words (2 bytes each) followed by 8 bytes.

The ClassID (or CLSID) is a UUID - see RFC 4122

Field Summary
`static ClassID` | `EQUATION30`
`static ClassID` | `EXCEL_V3`
`static ClassID` | `EXCEL_V3_CHART`
`static ClassID` | `EXCEL_V3_MACRO`
`static ClassID` | `EXCEL2003`
`static ClassID` | `EXCEL2007`
`static ClassID` | `EXCEL2007_MACRO`
`static ClassID` | `EXCEL2007_XLSB`
`static ClassID` | `EXCEL2010`
`static ClassID` | `EXCEL2010_CHART`
`static ClassID` | `EXCEL2010_ODS`
`static ClassID` | `EXCEL95`
`static ClassID` | `EXCEL95_CHART`
`static ClassID` | `EXCEL97`
`static ClassID` | `EXCEL97_CHART`
`static int` | `LENGTH` The number of bytes occupied by this object in the byte stream.
`static ClassID` | `OLE10_PACKAGE`
`static ClassID` | `POWERPOINT2007`
`static ClassID` | `POWERPOINT2007_MACRO`
`static ClassID` | `POWERPOINT95`
`static ClassID` | `POWERPOINT97`
`static ClassID` | `PPT_SHOW`
`static ClassID` | `TXT_ONLY`
`static ClassID` | `WORD2007`
`static ClassID` | `WORD2007_MACRO`
`static ClassID` | `WORD95`
`static ClassID` | `WORD97`
`static ClassID` | `XLS_WORKBOOK`

Constructor Summary
`ClassID()` Creates a `ClassID` and initializes its value with 0x00 bytes.
`ClassID(byte[] src, int offset)` Creates a `ClassID` and reads its value from a byte array.
`ClassID(java.lang.String externalForm)` Creates a `ClassID` from a human-readable representation of the Class ID in standard format `"{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}"`.

Method Summary
`boolean` | `equals(java.lang.Object o)` Checks whether this `ClassID` is equal to another object.
`boolean` | `equalsInverted(ClassID o)` Checks whether this `ClassID` is equal to another ClassID with inverted endianess, because there are apparently not only version 1 GUIDs (aka "network" with big-endian encoding), but also version 2 GUIDs (aka "native" with little-endian encoding) out there.
`byte[]` | `getBytes()` Gets the bytes making out the class ID.
`int` | `hashCode()`
`int` | `length()`
`byte[]` | `read(byte[] src, int offset)` Reads the class ID's value from a byte array by turning little-endian into big-endian.
`void` | `setBytes(byte[] bytes)` Sets the bytes making out the class ID.
`java.lang.String` | `toString()` Returns a human-readable representation of the Class ID in standard format `"{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}"`.
`void` | `write(byte[] dst, int offset)` Writes the class ID to a byte array in the little-endian format.

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

### OLE10_PACKAGE

    public static final ClassID OLE10_PACKAGE

### PPT_SHOW

    public static final ClassID PPT_SHOW

### XLS_WORKBOOK

    public static final ClassID XLS_WORKBOOK

### TXT_ONLY

    public static final ClassID TXT_ONLY

### EXCEL_V3

    public static final ClassID EXCEL_V3

### EXCEL_V3_CHART

    public static final ClassID EXCEL_V3_CHART

### EXCEL_V3_MACRO

    public static final ClassID EXCEL_V3_MACRO

### EXCEL95

    public static final ClassID EXCEL95

### EXCEL95_CHART

    public static final ClassID EXCEL95_CHART

### EXCEL97

    public static final ClassID EXCEL97

### EXCEL97_CHART

    public static final ClassID EXCEL97_CHART

### EXCEL2003

    public static final ClassID EXCEL2003

### EXCEL2007

    public static final ClassID EXCEL2007

### EXCEL2007_MACRO

    public static final ClassID EXCEL2007_MACRO

### EXCEL2007_XLSB

    public static final ClassID EXCEL2007_XLSB

### EXCEL2010

    public static final ClassID EXCEL2010

### EXCEL2010_CHART

    public static final ClassID EXCEL2010_CHART

### EXCEL2010_ODS

    public static final ClassID EXCEL2010_ODS

### WORD97

    public static final ClassID WORD97

### WORD95

    public static final ClassID WORD95

### WORD2007

    public static final ClassID WORD2007

### WORD2007_MACRO

    public static final ClassID WORD2007_MACRO

### POWERPOINT97

    public static final ClassID POWERPOINT97

### POWERPOINT95

    public static final ClassID POWERPOINT95

### POWERPOINT2007

    public static final ClassID POWERPOINT2007

### POWERPOINT2007_MACRO

    public static final ClassID POWERPOINT2007_MACRO

### EQUATION30

    public static final ClassID EQUATION30

### LENGTH

    public static final int LENGTH

  The number of bytes occupied by this object in the byte stream.

  See Also:
    Constant Field Values

Constructor Detail

### ClassID

    public ClassID(byte[] src,
                   int offset)

  Creates a `ClassID` and reads its value from a byte array.

  Parameters:
    `src` - The byte array to read from.
    `offset` - The offset of the first byte to read.

### ClassID

    public ClassID()

  Creates a `ClassID` and initializes its value with 0x00 bytes.

### ClassID

    public ClassID(java.lang.String externalForm)

  Creates a `ClassID` from a human-readable representation of the Class ID in standard format `"{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}"`.

  Parameters:
    `externalForm` - representation of the Class ID represented by this object.

Method Detail

### length

    public int length()

  Returns:
    The number of bytes occupied by this object in the byte stream.

### getBytes

    public byte[] getBytes()

  Gets the bytes making out the class ID. They are returned in correct order, i.e. big-endian.

  Returns:
    the bytes making out the class ID.

### setBytes

    public void setBytes(byte[] bytes)

  Sets the bytes making out the class ID.

  Parameters:
    `bytes` - The bytes making out the class ID in big-endian format. They are copied without their order being changed.

### read

    public byte[] read(byte[] src,
                       int offset)

  Reads the class ID's value from a byte array by turning little-endian into big-endian.

  Parameters:
    `src` - The byte array to read from
    `offset` - The offset within the `src` byte array
  Returns:
    A byte array containing the class ID.

### write

    public void write(byte[] dst,
                      int offset)
               throws java.lang.ArrayStoreException

  Writes the class ID to a byte array in the little-endian format.

  Parameters:
    `dst` - The byte array to write to.
    `offset` - The offset within the `dst` byte array.
  Throws:
    `java.lang.ArrayStoreException` - if there is not enough room for the class ID 16 bytes in the byte array after the `offset` position.

### equals

    public boolean equals(java.lang.Object o)

  Checks whether this `ClassID` is equal to another object.

  Overrides:
    `equals` in class `java.lang.Object`
  Parameters:
    `o` - the object to compare this `ClassID` with
  Returns:
    `true` if the objects are equal, else `false`.

### equalsInverted

    public boolean equalsInverted(ClassID o)

  Checks whether this `ClassID` is equal to another ClassID with inverted endianess, because there are apparently not only version 1 GUIDs (aka "network" with big-endian encoding), but also version 2 GUIDs (aka "native" with little-endian encoding) out there.

  Parameters:
    `o` - the object to compare this `ClassID` with
  Returns:
    `true` if the objects are equal, else `false`.

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `java.lang.Object`
  See Also:
    `Object.hashCode()`

### toString

    public java.lang.String toString()

  Returns a human-readable representation of the Class ID in standard format `"{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}"`.

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    String representation of the Class ID represented by this object.

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Copyright 2017 The Apache Software Foundation or its licensors, as applicable.