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## javax.xml.crypto.dom
Class DOMCryptoContext

    java.lang.Object
      javax.xml.crypto.dom.DOMCryptoContext

All Implemented Interfaces:
  XMLCryptoContext

Direct Known Subclasses:
  DOMSignContext, DOMValidateContext

    public class DOMCryptoContext

extends Object
implements XMLCryptoContext

This class provides a DOM-specific implementation of the `XMLCryptoContext` interface. It also includes additional methods that are specific to a DOM-based implementation for registering and retrieving elements that contain attributes of type ID.

Since:
  1.6

Constructor Summary
`protected` | `DOMCryptoContext()` Default constructor.

Method Summary
`Object` | `get(Object key)` This implementation uses an internal `HashMap` to get the object that the specified key maps to.
`String` | `getBaseURI()` Returns the base URI.
`String` | `getDefaultNamespacePrefix()` Returns the default namespace prefix.
`Element` | `getElementById(String idValue)` Returns the `Element` with the specified ID attribute value.
`KeySelector` | `getKeySelector()` Returns the key selector for finding a key.
`String` | `getNamespacePrefix(String namespaceURI, String defaultPrefix)` This implementation uses an internal `HashMap` to get the prefix that the specified URI maps to.
`Object` | `getProperty(String name)` This implementation uses an internal `HashMap` to get the object that the specified name maps to.
`URIDereferencer` | `getURIDereferencer()` Returns a `URIDereferencer` that is used to dereference `URIReference`s.
`Iterator` | `iterator()` Returns a read-only iterator over the set of Id/Element mappings of this `DOMCryptoContext`.
`Object` | `put(Object key, Object value)` This implementation uses an internal `HashMap` to map the key to the specified object.
`String` | `putNamespacePrefix(String namespaceURI, String prefix)` This implementation uses an internal `HashMap` to map the URI to the specified prefix.
`void` | `setBaseURI(String baseURI)` Sets the base URI.
`void` | `setDefaultNamespacePrefix(String defaultPrefix)` Sets the default namespace prefix.
`void` | `setIdAttributeNS(Element element, String namespaceURI, String localName)` Registers the element's attribute specified by the namespace URI and local name to be of type ID.
`void` | `setKeySelector(KeySelector ks)` Sets the key selector for finding a key.
`Object` | `setProperty(String name, Object value)` This implementation uses an internal `HashMap` to map the name to the specified object.
`void` | `setURIDereferencer(URIDereferencer dereferencer)` Sets a `URIDereferencer` that is used to dereference `URIReference`s.

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

Constructor Detail

### DOMCryptoContext

    protected DOMCryptoContext()

  Default constructor. (For invocation by subclass constructors).

Method Detail

### getNamespacePrefix

    public String getNamespacePrefix(String namespaceURI,
                                     String defaultPrefix)

  This implementation uses an internal `HashMap` to get the prefix that the specified URI maps to. It returns the `defaultPrefix` if it maps to `null`.

  Specified by:
    `getNamespacePrefix` in interface `XMLCryptoContext`
  Parameters:
    `namespaceURI` - a namespace URI
    `defaultPrefix` - the prefix to be returned in the event that the the specified namespace URI has not been bound to a prefix.
  Returns:
    the prefix that is associated with the specified namespace URI, or `defaultPrefix` if the URI is not registered. If the namespace URI is registered but has no prefix, an empty string (`""`) is returned.
  Throws:
    `NullPointerException` - if `namespaceURI` is `null`
  See Also:
    `XMLCryptoContext.putNamespacePrefix(String, String)`

### putNamespacePrefix

    public String putNamespacePrefix(String namespaceURI,
                                     String prefix)

  This implementation uses an internal `HashMap` to map the URI to the specified prefix.

  Specified by:
    `putNamespacePrefix` in interface `XMLCryptoContext`
  Parameters:
    `namespaceURI` - a namespace URI
    `prefix` - a namespace prefix (or `null` to remove any existing mapping). Specifying the empty string (`""`) binds no prefix to the namespace URI.
  Returns:
    the previous prefix associated with the specified namespace URI, or `null` if there was none
  Throws:
    `NullPointerException` - if `namespaceURI` is `null`
  See Also:
    `XMLCryptoContext.getNamespacePrefix(String, String)`

### getDefaultNamespacePrefix

    public String getDefaultNamespacePrefix()

  Description copied from interface: `XMLCryptoContext`
  Returns the default namespace prefix. The default namespace prefix is the prefix for all namespace URIs not explicitly set by the `putNamespacePrefix` method.

  Specified by:
    `getDefaultNamespacePrefix` in interface `XMLCryptoContext`
  Returns:
    the default namespace prefix, or `null` if none has been set.
  See Also:
    `XMLCryptoContext.setDefaultNamespacePrefix(String)`

### setDefaultNamespacePrefix

    public void setDefaultNamespacePrefix(String defaultPrefix)

  Description copied from interface: `XMLCryptoContext`
  Sets the default namespace prefix. This sets the namespace prefix for all namespace URIs not explicitly set by the `putNamespacePrefix` method.

  Specified by:
    `setDefaultNamespacePrefix` in interface `XMLCryptoContext`
  Parameters:
    `defaultPrefix` - the default namespace prefix, or `null` to remove the current setting. Specify the empty string (`""`) to bind no prefix.
  See Also:
    `XMLCryptoContext.getDefaultNamespacePrefix()`

### getBaseURI

    public String getBaseURI()

  Description copied from interface: `XMLCryptoContext`
  Returns the base URI.

  Specified by:
    `getBaseURI` in interface `XMLCryptoContext`
  Returns:
    the base URI, or `null` if not specified
  See Also:
    `XMLCryptoContext.setBaseURI(String)`

### setBaseURI

    public void setBaseURI(String baseURI)

  Description copied from interface: `XMLCryptoContext`
  Sets the base URI.

  Specified by:
    `setBaseURI` in interface `XMLCryptoContext`
  Parameters:
    `baseURI` - the base URI, or `null` to remove current value
  Throws:
    `IllegalArgumentException` - if `baseURI` is not RFC 2396 compliant
  See Also:
    `XMLCryptoContext.getBaseURI()`

### getURIDereferencer

    public URIDereferencer getURIDereferencer()

  Description copied from interface: `XMLCryptoContext`
  Returns a `URIDereferencer` that is used to dereference `URIReference`s.

  Specified by:
    `getURIDereferencer` in interface `XMLCryptoContext`
  Returns:
    the `URIDereferencer`, or `null` if not specified
  See Also:
    `XMLCryptoContext.setURIDereferencer(URIDereferencer)`

### setURIDereferencer

    public void setURIDereferencer(URIDereferencer dereferencer)

  Description copied from interface: `XMLCryptoContext`
  Sets a `URIDereferencer` that is used to dereference `URIReference`s. The specified `URIDereferencer` is used in place of an implementation's default `URIDereferencer`.

  Specified by:
    `setURIDereferencer` in interface `XMLCryptoContext`
  Parameters:
    `dereferencer` - the `URIDereferencer`, or `null` to remove any current setting
  See Also:
    `XMLCryptoContext.getURIDereferencer()`

### getProperty

    public Object getProperty(String name)

  This implementation uses an internal `HashMap` to get the object that the specified name maps to.

  Specified by:
    `getProperty` in interface `XMLCryptoContext`
  Parameters:
    `name` - the name of the property
  Returns:
    the current value of the specified property, or `null` if it does not have a value
  Throws:
    `NullPointerException` - if `name` is `null`
  See Also:
    `XMLCryptoContext.setProperty(String, Object)`

### setProperty

    public Object setProperty(String name,
                              Object value)

  This implementation uses an internal `HashMap` to map the name to the specified object.

  Specified by:
    `setProperty` in interface `XMLCryptoContext`
  Parameters:
    `name` - the name of the property
    `value` - the value of the property to be set
  Returns:
    the previous value of the specified property, or `null` if it did not have a value
  Throws:
    `NullPointerException` - if `name` is `null`
  See Also:
    `XMLCryptoContext.getProperty(String)`

### getKeySelector

    public KeySelector getKeySelector()

  Description copied from interface: `XMLCryptoContext`
  Returns the key selector for finding a key.

  Specified by:
    `getKeySelector` in interface `XMLCryptoContext`
  Returns:
    the key selector, or `null` if not specified
  See Also:
    `XMLCryptoContext.setKeySelector(KeySelector)`

### setKeySelector

    public void setKeySelector(KeySelector ks)

  Description copied from interface: `XMLCryptoContext`
  Sets the key selector for finding a key.

  Specified by:
    `setKeySelector` in interface `XMLCryptoContext`
  Parameters:
    `ks` - the key selector, or `null` to remove the current setting
  See Also:
    `XMLCryptoContext.getKeySelector()`

### getElementById

    public Element getElementById(String idValue)

  Returns the `Element` with the specified ID attribute value.

  This implementation uses an internal `HashMap` to get the element that the specified attribute value maps to.

  Parameters:
    `idValue` - the value of the ID
  Returns:
    the `Element` with the specified ID attribute value, or `null` if none.
  Throws:
    `NullPointerException` - if `idValue` is `null`
  See Also:
    `setIdAttributeNS(org.w3c.dom.Element, java.lang.String, java.lang.String)`

### setIdAttributeNS

    public void setIdAttributeNS(Element element,
                                 String namespaceURI,
                                 String localName)

  Registers the element's attribute specified by the namespace URI and local name to be of type ID. The attribute must have a non-empty value.

  This implementation uses an internal `HashMap` to map the attribute's value to the specified element.

  Parameters:
    `element` - the element
    `namespaceURI` - the namespace URI of the attribute (specify `null` if not applicable)
    `localName` - the local name of the attribute
  Throws:
    `IllegalArgumentException` - if `localName` is not an attribute of the specified element or it does not contain a specific value
    `NullPointerException` - if `element` or `localName` is `null`
  See Also:
    `getElementById(java.lang.String)`

### iterator

    public Iterator iterator()

  Returns a read-only iterator over the set of Id/Element mappings of this `DOMCryptoContext`. Attempts to modify the set via the `Iterator.remove()` method throw an `UnsupportedOperationException`. The mappings are returned in no particular order. Each element in the iteration is represented as a `Map.Entry`. If the `DOMCryptoContext` is modified while an iteration is in progress, the results of the iteration are undefined.

  Returns:
    a read-only iterator over the set of mappings

### get

    public Object get(Object key)

  This implementation uses an internal `HashMap` to get the object that the specified key maps to.

  Specified by:
    `get` in interface `XMLCryptoContext`
  Parameters:
    `key` - the key whose associated value is to be returned
  Returns:
    the value to which this context maps the specified key, or `null` if there is no mapping for the key
  See Also:
    `XMLCryptoContext.put(Object, Object)`

### put

    public Object put(Object key,
                      Object value)

  This implementation uses an internal `HashMap` to map the key to the specified object.

  Specified by:
    `put` in interface `XMLCryptoContext`
  Parameters:
    `key` - key with which the specified value is to be associated with
    `value` - value to be associated with the specified key
  Returns:
    the previous value associated with the key, or `null` if there was no mapping for the key
  Throws:
    `IllegalArgumentException` - if some aspect of this key or value prevents it from being stored in this context
  See Also:
    `XMLCryptoContext.get(Object)`

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