252 lines
7.9 KiB
Java
252 lines
7.9 KiB
Java
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/*
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* @(#)Base64BinaryAttribute.java
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*
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* Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistribution of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistribution in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* Neither the name of Sun Microsystems, Inc. or the names of contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* This software is provided "AS IS," without a warranty of any kind. ALL
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* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
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* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
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* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
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* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
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* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
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* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
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* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
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* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
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* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
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* EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
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*
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* You acknowledge that this software is not designed or intended for use in
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* the design, construction, operation or maintenance of any nuclear facility.
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*/
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package com.sun.xacml.attr;
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import com.sun.xacml.Constants;
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import com.sun.xacml.ParsingException;
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import java.io.IOException;
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import java.net.URI;
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import java.util.Arrays;
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import org.w3c.dom.Node;
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/**
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* Representation of an xsi:base64Binary value. This class supports parsing
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* xsi:base64Binary values. All objects of this class are immutable and
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* all methods of the class are thread-safe.
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*
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* @since 1.0
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* @author Steve Hanna
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*/
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public class Base64BinaryAttribute extends AttributeValue
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{
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/**
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* Official name of this type
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*/
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public static final String identifier =
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TypeIdentifierConstants.BASE64BINARY;
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/**
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* URI version of name for this type
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* <p>
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* This field is initialized by a static initializer so that
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* we can catch any exceptions thrown by URI(String) and
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* transform them into a RuntimeException, since this should
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* never happen but should be reported properly if it ever does.
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*/
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private static URI identifierURI;
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/**
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* RuntimeException that wraps an Exception thrown during the
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* creation of identifierURI, null if none.
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*/
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private static RuntimeException earlyException;
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/**
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* Static initializer that initializes the identifierURI
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* class field so that we can catch any exceptions thrown
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* by URI(String) and transform them into a RuntimeException.
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* Such exceptions should never happen but should be reported
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* properly if they ever do.
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*/
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static {
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try {
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identifierURI = URI.create(identifier);
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} catch (IllegalArgumentException e) {
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earlyException = e;
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}
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}
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/**
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* The actual binary value that this object represents.
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*/
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private byte [] value;
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/**
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* The value returned by toString(). Cached, but only
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* generated if needed.
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*/
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private String strValue;
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/**
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* Creates a new <code>Base64BinaryAttribute</code> that represents
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* the byte [] value supplied.
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*
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* @param value the <code>byte []</code> value to be represented
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*/
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public Base64BinaryAttribute(byte [] value) {
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super(identifierURI);
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// Shouldn't happen, but just in case...
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if (earlyException != null) {
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throw earlyException;
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}
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// This will throw a NullPointerException if value == null.
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// That's what we want in that case.
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this.value = (byte[])value.clone();
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}
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/**
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* Returns a new <code>Base64BinaryAttribute</code> that represents
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* the xsi:base64Binary at a particular DOM node.
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*
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* @param root the <code>Node</code> that contains the desired value
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* @return a new <code>Base64BinaryAttribute</code> representing the
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* appropriate value
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* @exception ParsingException if a parsing error occurs
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*/
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public static Base64BinaryAttribute getInstance(Node root)
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throws ParsingException {
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if (root.getFirstChild() != null) {
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return getInstance(root.getFirstChild().getNodeValue());
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}
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throw new ParsingException("Error while parsing"
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+ "a Base64BinaryAttribute");
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}
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/**
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* Returns a new <code>Base64BinaryAttribute</code> that represents
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* the xsi:base64Binary value indicated by the string provided.
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*
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* @param value a string representing the desired value
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* @return a new <code>Base64BinaryAttribute</code> representing the
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* desired value
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* @exception ParsingException if a parsing error occurs
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*/
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public static Base64BinaryAttribute getInstance(String value)
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throws ParsingException {
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if (value == null) {
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throw new ParsingException("Can't create a "
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+ "Base64BinaryAttribute from null input");
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}
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byte [] bytes = null;
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try {
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bytes = Base64.decode(value, false);
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} catch (IOException e) {
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throw new ParsingException("Couldn't parse purported " +
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"Base64 string: " + value, e);
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}
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return new Base64BinaryAttribute(bytes);
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}
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/**
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* Returns the <code>byte []</code> value represented by this object.
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* Note that this value is cloned before returning to prevent
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* unauthorized modifications.
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*
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* @return the <code>byte []</code> value
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*/
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public byte [] getValue() {
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return (byte[])this.value.clone();
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}
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/**
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* Returns true if the input is an instance of this class and if its
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* value equals the value contained in this class.
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*
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* @param o the object to compare
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*
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* @return true if this object and the input represent the same value
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*/
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public boolean equals(Object o) {
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if (! (o instanceof Base64BinaryAttribute)) {
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return false;
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}
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Base64BinaryAttribute other = (Base64BinaryAttribute)o;
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return Arrays.equals(this.value, other.value);
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}
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/**
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* Returns the hashcode value used to index and compare this object with
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* others of the same type. Typically this is the hashcode of the backing
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* data object.
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*
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* @return the object's hashcode value
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*/
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public int hashCode() {
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int code = this.value[0];
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for (int i = 1; i < this.value.length; i++) {
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code *= 31;
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code += this.value[i];
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}
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return code;
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}
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/**
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* Make the String representation of this object.
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*
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* @return the String representation
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*/
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private String makeStringRep() {
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return Base64.encode(this.value);
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}
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/**
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* Returns a String representation.
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*
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* @return the String representation
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*/
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public String toString() {
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if (this.strValue == null) {
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this.strValue = makeStringRep();
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}
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return "Base64BinaryAttribute: [" + Constants.nl
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+ this.strValue + "]" + Constants.nl;
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}
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/**
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* @return The String encoding this AttributeValue.
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*/
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public String encode() {
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if (this.strValue == null) {
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this.strValue = makeStringRep();
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}
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return this.strValue;
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}
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}
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