268 lines
10 KiB
Java
268 lines
10 KiB
Java
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/*
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* @(#)BaseAttributeFactory.java
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*
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* Copyright 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.ParsingException;
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import com.sun.xacml.UnknownIdentifierException;
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import com.sun.xacml.debug.RuntimeInfo;
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import com.sun.xacml.debug.RuntimeInfo.ELEMENT_TYPE;
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import java.net.URI;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Set;
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import org.w3c.dom.Node;
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/**
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* This is a basic implementation of <code>AttributeFactory</code>. It
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* implements the insertion and retrieval methods, but doesn't actually
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* setup the factory with any datatypes.
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* <p>
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* Note that while this class is thread-safe on all creation methods, it
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* is not safe to add support for a new datatype while creating an instance
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* of a value. This follows from the assumption that most people will
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* initialize these factories up-front, and then start processing without
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* ever modifying the factories. If you need these mutual operations to
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* be thread-safe, then you should write a wrapper class that implements
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* the right synchronization.
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*
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* @since 1.2
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* @author Seth Proctor
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*/
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public class BaseAttributeFactory extends AttributeFactory
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{
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// the map of proxies
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private HashMap<String, AttributeProxy> attributeMap;
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/**
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* Default constructor.
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*/
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public BaseAttributeFactory() {
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this.attributeMap = new HashMap<String, AttributeProxy>();
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}
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/**
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* Constructor that configures this factory with an initial set of
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* supported datatypes.
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*
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* @param attributes a <code>Map</code> of <code>String</code>s to
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* </code>AttributeProxy</code>s
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*
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* @throws IllegalArgumentException if any elements of the Map are not
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* </code>AttributeProxy</code>s
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*/
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public BaseAttributeFactory(Map<String, AttributeProxy> attributes) {
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this.attributeMap = new HashMap<String, AttributeProxy>();
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Iterator<String> it = attributes.keySet().iterator();
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while (it.hasNext()) {
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try {
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String id = it.next();
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AttributeProxy proxy = attributes.get(id);
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this.attributeMap.put(id, proxy);
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} catch (ClassCastException cce) {
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throw new IllegalArgumentException("an element of the map " +
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"was not an instance of " +
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"AttributeProxy");
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}
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}
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}
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/**
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* Adds a proxy to the factory, which in turn will allow new attribute
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* types to be created using the factory. Typically the proxy is
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* provided as an anonymous class that simply calls the getInstance
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* methods (or something similar) of some <code>AttributeValue</code>
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* class.
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*
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* @param id the name of the attribute type
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* @param proxy the proxy used to create new attributes of the given type
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*/
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public void addDatatype(String id, AttributeProxy proxy) {
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// make sure this doesn't already exist
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if (this.attributeMap.containsKey(id)) {
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throw new IllegalArgumentException("datatype already exists");
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}
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this.attributeMap.put(id, proxy);
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}
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/**
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* Returns the datatype identifiers supported by this factory.
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*
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* @return a <code>Set</code> of <code>String</code>s
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*/
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public Set<String> getSupportedDatatypes() {
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return Collections.unmodifiableSet(this.attributeMap.keySet());
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}
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/**
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* Creates a value based on the given DOM root node. The type of the
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* attribute is assumed to be present in the node as an XACML attribute
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* named <code>DataType</code>, as is the case with the
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* AttributeValueType in the policy schema. The value is assumed to be
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* the first child of this node.
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*
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* @param root the DOM root of an attribute value
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*
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* @return a new <code>AttributeValue</code>
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*
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* @throws UnknownIdentifierException if the type in the node isn't
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* known to the factory
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* @throws ParsingException if the node is invalid or can't be parsed
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* by the appropriate proxy
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*/
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public AttributeValue createValue(Node root)
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throws UnknownIdentifierException, ParsingException {
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if (root.getNodeType() != Node.ELEMENT_NODE ||
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root.getAttributes().getNamedItem("DataType") == null) {
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RuntimeInfo src = RuntimeInfo.getRuntimeInfo(root, ELEMENT_TYPE.ATTRIBUTE_VALUE);
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String message = "";
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if ( root.getNodeType() != Node.ELEMENT_NODE ) {
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message = ": received element is not a node (" + root.toString() + ")";
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} else if ( root.getAttributes().getNamedItem("DataType") == null) {
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message = ": missing attribute \"DataType\"";
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}
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throw new ParsingException("Error while parsing AttributeValue" + message +
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( src == null ? "" : src.getLocationMsgForError()));
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}
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Node node = root.getAttributes().getNamedItem("DataType");
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return createValue(root, node.getNodeValue());
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}
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/**
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* Creates a value based on the given DOM root node and data type.
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*
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* @param root the DOM root of an attribute value
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* @param dataType the type of the attribute
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*
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* @return a new <code>AttributeValue</code>
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*
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* @throws UnknownIdentifierException if the data type isn't known to
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* the factory
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* @throws ParsingException if the node is invalid or can't be parsed
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* by the appropriate proxy
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*/
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public AttributeValue createValue(Node root, URI dataType)
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throws UnknownIdentifierException, ParsingException
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{
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return createValue(root, dataType.toString());
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}
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/**
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* Creates a value based on the given DOM root node and data type.
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*
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* @param root the DOM root of an attribute value
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* @param type the type of the attribute
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*
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* @return a new <code>AttributeValue</code>
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*
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* @throws UnknownIdentifierException if the type isn't known to
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* the factory
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* @throws ParsingException if the node is invalid or can't be parsed
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* by the appropriate proxy
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*/
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public AttributeValue createValue(Node root, String type)
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throws UnknownIdentifierException, ParsingException
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{
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AttributeProxy proxy = (AttributeProxy)(this.attributeMap.get(type));
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RuntimeInfo src = RuntimeInfo.getRuntimeInfo(root, ELEMENT_TYPE.ATTRIBUTE_VALUE);
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if (proxy != null) {
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try {
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AttributeValue val = proxy.getInstance(root);
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if ( src != null ) {
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val.setSrcLocFromFactory(src);
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src.setXACMLObject(val);
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}
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return val;
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} catch (Exception e) {
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throw new ParsingException("couldn't create " + type
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+ " attribute based on DOM node"
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+ (src != null ? src.getLocationMsgForError() : ""), e);
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}
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}
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throw new UnknownIdentifierException("Attributes of type " + type
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+ " aren't supported."
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+ (src != null ? src.getLocationMsgForError() : ""));
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}
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/**
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* Creates a value based on the given data type and text-encoded value.
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* Used primarily by code that does an XPath query to get an
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* attribute value, and then needs to turn the resulting value into
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* an Attribute class.
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*
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* @param dataType the type of the attribute
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* @param value the text-encoded representation of an attribute's value
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*
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* @return a new <code>AttributeValue</code>
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*
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* @throws UnknownIdentifierException if the data type isn't known to
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* the factory
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* @throws ParsingException if the text is invalid or can't be parsed
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* by the appropriate proxy
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*/
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public AttributeValue createValue(URI dataType, String value)
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throws UnknownIdentifierException, ParsingException
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{
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String type = dataType.toString();
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AttributeProxy proxy = (AttributeProxy)(this.attributeMap.get(type));
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if (proxy != null) {
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try {
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return proxy.getInstance(value);
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} catch (Exception e) {
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throw new ParsingException("couldn't create " + type
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+ " attribute from input: " + value, e);
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}
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}
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throw new UnknownIdentifierException("Attributes of type " + type
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+ " aren't supported.");
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}
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}
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