java.lang.Object
- com.snowtide.pdf.forms.AcroSignatureField

All Implemented Interfaces:

DocumentLocation, AcroFormField, FormField, Bounded
```
public class AcroSignatureField
extends Object
```
Represents a digital signature field in an interactive AcroForm.

PDFxStream does not provide higher-level support for this type of field, and its value cannot be updated (calling setValue(String) on an AcroSignatureField will result in an UnsupportedOperationException exception being thrown).

However, all of a signature field's raw data may be accessed via getValue(), which will return a java.util.Map object containing dictionary values as specified by Section 8.6.3 ('Signature Fields') and Table 8.9.3 in the PDF document specification.

Version:

©2004-2025 Snowtide

Field Summary
- Fields inherited from interface com.snowtide.pdf.forms.AcroFormField
  FIELD_TYPE_BUTTON, FIELD_TYPE_CHOICE, FIELD_TYPE_OTHER, FIELD_TYPE_SIGNATURE, FIELD_TYPE_TEXT

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Region`	`bounds()`
`boolean`	`canChangeValue()`	This function returns true only if this form field is of a subtype that supports setting its value.
`Object`	`getDefaultValue()`	Returns the default value to which the field reverts when a reset-form action is executed, as specified in the /DV entry in this field's PDF dictionary.
`String`	`getFullName()`	Returns the fully-qualified name of this field, which should be unique within a PDF document form.
`String`	`getLocalName()`	Returns the local name of the field, as specified in the /T entry in this field's PDF dictionary.
`String`	`getMappingName()`	Returns the 'mapping name' of this field, as specified in the /TM entry in this field's PDF dictionary.
`String`	`getName()`	Returns the canonical name of this field.
`Object`	`getType()`	Returns the type of field, as specified in the /FT entry in this field's PDF dictionary.
`String`	`getUIName()`	Returns the user-friendly name of this field, as specified in the /TU entry in this field's PDF dictionary.
`Object`	`getValue()`	Returns the value of this field, as specified in the /V entry in this field's PDF dictionary.
`boolean`	`hasValueChanged()`	Returns true only if this field's value has been changed since being loaded from the PDF document.
`boolean`	`isReadOnly()`	Returns true only if this field is designated as read-only.
`int`	`pageNumber()`	This page number is 0-indexed, and may be used to retrieve a `Page` object representing the page's content using the `Document#getPage(int)` function.
`boolean`	`setValue(String arg0)`	Sets the value of this form field.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - bounds
```
public Region bounds()
```
    Specified by:
    
    bounds in interface Bounded
  - pageNumber
```
public int pageNumber()
```
    Description copied from interface: DocumentLocation
    
    This page number is 0-indexed, and may be used to retrieve a Page object representing the page's content using the Document.getPage(int) function.
    If a page number is not available for some reason, then this method will return -1.
    
    Specified by:
    
    pageNumber in interface DocumentLocation
  - isReadOnly
```
public boolean isReadOnly()
```
    Description copied from interface: AcroFormField
    
    Returns true only if this field is designated as read-only. Note that this is just a hint, provided for the benefit of end-user tools. PDFxStream does not enforce the read-only state of a form field; i.e. it will allow a field's value to be set even if it is designated as read-only.
    
    Specified by:
    
    isReadOnly in interface AcroFormField
  - getDefaultValue
```
public Object getDefaultValue()
```
    Description copied from interface: AcroFormField
    
    Returns the default value to which the field reverts when a reset-form action is executed, as specified in the /DV entry in this field's PDF dictionary. The type of the returned object will be the same as the type of object returned by the AcroFormField.getValue() function, and depends upon the type of this field.
    
    Specified by:
    
    getDefaultValue in interface AcroFormField
  - getFullName
```
public String getFullName()
```
    Description copied from interface: AcroFormField
    
    Returns the fully-qualified name of this field, which should be unique within a PDF document form. Details of how full names are constructed are specified in Section 8.6.2 (Field Names) of the PDF Document Specification.
    
    It suffices to say here that form fields in an interactive AcroForm are defined in a hierarchical manner, and that their local names are used to derive a period-delimited full name that guarantees each name's uniqueness within the parent AcroForm.
    
    Specified by:
    
    getFullName in interface AcroFormField
  - getLocalName
```
public String getLocalName()
```
    Description copied from interface: AcroFormField
    
    Returns the local name of the field, as specified in the /T entry in this field's PDF dictionary. This name is also used as the value returned by the FormField.getName() implementation.
    
    Specified by:
    
    getLocalName in interface AcroFormField
  - getMappingName
```
public String getMappingName()
```
    Description copied from interface: AcroFormField
    
    Returns the 'mapping name' of this field, as specified in the /TM entry in this field's PDF dictionary. The mapping name is used to identify the field in exported form data formats. This function can return null if no mapping name is defined.
    
    Specified by:
    
    getMappingName in interface AcroFormField
  - getName
```
public String getName()
```
    Description copied from interface: FormField
    
    Returns the canonical name of this field. Only one FormField instance with a particular name should be available from a Form instance.
    
    Specified by:
    
    getName in interface FormField
  - getType
```
public Object getType()
```
    Description copied from interface: AcroFormField
    Returns the type of field, as specified in the /FT entry in this field's PDF dictionary. This is an indication of the subtype of this AcroFormField instance:
    
    If the return value is FIELD_TYPE_BUTTON, then this AcroFormField is an instance of AcroButtonField
    
    If the return value is FIELD_TYPE_TEXT, then this AcroFormField is an instance of AcroTextField
    
    If the return value is FIELD_TYPE_CHOICE, then this AcroFormField is an instance of AcroChoiceField
    
    If the return value is FIELD_TYPE_SIGNATURE, then this AcroFormField is an instance of AcroSignatureField
    
    If the return value is FIELD_TYPE_OTHER, then this AcroFormField has no specific concrete implementation. This case is reserved for form fields with new type indicators that may be introduced by Adobe in the future.
    Specified by:
    
    getType in interface AcroFormField
  - setValue
```
public boolean setValue(String arg0)
                 throws UnsupportedOperationException
```
    Description copied from interface: AcroFormField
    
    Sets the value of this form field. Each AcroFormField implementation may specify additional varieties of setValue() to support unique functionality (such as holding multiple values). For any form field instance, this function will throw an UnsupportedOperationException if it does not support updates; such instances will return false from AcroFormField.canChangeValue(). This function will return true if the form field's value changes as a result of calling this function (i.e. the given value is different from the current value of the form field).
    
    Either AcroForm.writeUpdatedDocument(java.io.File) or AcroForm.writeUpdatedDocument(java.io.OutputStream) must be called after setting any form field values in order to persist such changes to a PDF document.
    
    Specified by:
    
    setValue in interface AcroFormField
    
    Throws:
    
    UnsupportedOperationException - if an AcroFormField implementation does not support updates.
  - hasValueChanged
```
public boolean hasValueChanged()
```
    Description copied from interface: AcroFormField
    
    Returns true only if this field's value has been changed since being loaded from the PDF document.
    
    Specified by:
    
    hasValueChanged in interface AcroFormField
  - canChangeValue
```
public boolean canChangeValue()
```
    Description copied from interface: AcroFormField
    
    This function returns true only if this form field is of a subtype that supports setting its value. This includes checkboxes, radio button groups, text fields, and choice fields (lists and dropdown controls).
    
    Specified by:
    
    canChangeValue in interface AcroFormField
  - getUIName
```
public String getUIName()
```
    Description copied from interface: AcroFormField
    
    Returns the user-friendly name of this field, as specified in the /TU entry in this field's PDF dictionary. This function can return null if no user-friendly field name is defined.
    
    Specified by:
    
    getUIName in interface AcroFormField
    
    Specified by:
    
    getUIName in interface FormField
  - getValue
```
public Object getValue()
```
    Description copied from interface: AcroFormField
    
    Returns the value of this field, as specified in the /V entry in this field's PDF dictionary. The type of the returned object depends upon the type of this field.
    
    Specified by:
    
    getValue in interface AcroFormField
    
    Specified by:
    
    getValue in interface FormField

Class AcroSignatureField

Field Summary

Fields inherited from interface com.snowtide.pdf.forms.AcroFormField

Method Summary

Methods inherited from class java.lang.Object

Method Detail

bounds

pageNumber

isReadOnly

getDefaultValue

getFullName

getLocalName

getMappingName

getName

getType

setValue

hasValueChanged

canChangeValue

getUIName

getValue