File	Doc	Category	Size	Date	Package
KeySelector.java	API Doc	Java SE 6 API	4547	Tue Jun 10 00:27:06 BST 2008	javax.xml.crypto

KeySelector

• java.lang.Object

Fields Summary

Constructors Summary
protected KeySelector() Default no-args constructor; intended for invocation by subclasses only.

Methods Summary
public abstract javax.xml.crypto.KeySelectorResult	select(javax.xml.crypto.dsig.keyinfo.KeyInfo keyInfo, javax.xml.crypto.KeySelector$Purpose purpose, javax.xml.crypto.AlgorithmMethod method, javax.xml.crypto.XMLCryptoContext context) Attempts to find a key that satisfies the specified constraints. param keyInfo a KeyInfo (may be null) param purpose the key's purpose ({@link Purpose#SIGN}, {@link Purpose#VERIFY}, {@link Purpose#ENCRYPT}, or {@link Purpose#DECRYPT}) param method the algorithm method that this key is to be used for. Only keys that are compatible with the algorithm and meet the constraints of the specified algorithm should be returned. param context an XMLCryptoContext that may contain useful information for finding an appropriate key. If this key selector supports resolving {@link RetrievalMethod} types, the context's baseURI and dereferencer parameters (if specified) should be used by the selector to resolve and dereference the URI. return the result of the key selector throws KeySelectorException if an exceptional condition occurs while attempting to find a key. Note that an inability to find a key is not considered an exception (null should be returned in that case). However, an error condition (ex: network communications failure) that prevented the KeySelector from finding a potential key should be considered an exception. throws ClassCastException if the data type of method is not supported by this key selector
public static javax.xml.crypto.KeySelector	singletonKeySelector(java.security.Key key) Returns a KeySelector that always selects the specified key, regardless of the KeyInfo passed to it. param key the sole key to be stored in the key selector return a key selector that always selects the specified key throws NullPointerException if key is null return new SingletonKeySelector(key);