/*
* @(#)StandardAttributeFactory
*
* Copyright 2004-2006 Sun Microsystems, Inc. All Rights Reserved.
*
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* modification, are permitted provided that the following conditions are met:
*
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*
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* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
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package com.sun.xacml.attr;
import java.util.Collections;
import java.util.HashMap;
import java.util.Set;
import java.util.logging.Logger;
import com.sun.xacml.PolicyMetaData;
import com.sun.xacml.UnknownIdentifierException;
import com.sun.xacml.attr.proxy.AnyURIAttributeProxy;
import com.sun.xacml.attr.proxy.Base64BinaryAttributeProxy;
import com.sun.xacml.attr.proxy.BooleanAttributeProxy;
import com.sun.xacml.attr.proxy.DNSNameAttributeProxy;
import com.sun.xacml.attr.proxy.DateAttributeProxy;
import com.sun.xacml.attr.proxy.DateTimeAttributeProxy;
import com.sun.xacml.attr.proxy.DayTimeDurationAttributeProxy;
import com.sun.xacml.attr.proxy.DoubleAttributeProxy;
import com.sun.xacml.attr.proxy.HexBinaryAttributeProxy;
import com.sun.xacml.attr.proxy.IPAddressAttributeProxy;
import com.sun.xacml.attr.proxy.IntegerAttributeProxy;
import com.sun.xacml.attr.proxy.RFC822NameAttributeProxy;
import com.sun.xacml.attr.proxy.StringAttributeProxy;
import com.sun.xacml.attr.proxy.TimeAttributeProxy;
import com.sun.xacml.attr.proxy.X500NameAttributeProxy;
import com.sun.xacml.attr.proxy.YearMonthDurationAttributeProxy;
/**
* This factory supports the standard set of datatypes specified in XACML 1.x and 2.0. It is the
* default factory used by the system, and imposes a singleton pattern insuring that there is only
* ever one instance of this class.
* <p>
* Note that because this supports only the standard datatypes, this factory does not allow the
* addition of any other datatypes. If you call <code>addDatatype</code> on an instance of this
* class, an exception will be thrown. If you need a standard factory that is modifiable, you should
* create a new <code>BaseAttributeFactory</code> (or some other <code>AttributeFactory</code>) and
* configure it with the standard datatypes using <code>addStandardDatatypes</code> (or, in the case
* of <code>BaseAttributeFactory</code>, by providing the datatypes in the constructor).
*
* @since 1.2
* @author Seth Proctor
*
* Adding generic type support by Christian Mueller (geotools)
*/
public class StandardAttributeFactory extends BaseAttributeFactory {
// the one instance of this factory
private static StandardAttributeFactory factoryInstance = null;
// the datatypes supported by this factory
private static HashMap<String, AttributeProxy> supportedDatatypes = null;
// the supported identifiers for each version of XACML
private static Set<String> supportedV1Identifiers;
private static Set<String> supportedV2Identifiers;
// the logger we'll use for all messages
private static final Logger logger = Logger.getLogger(StandardAttributeFactory.class.getName());
/**
* Private constructor that sets up proxies for all of the standard datatypes.
*/
private StandardAttributeFactory() {
super(supportedDatatypes);
}
/**
* Private initializer for the supported datatypes. This isn't called until something needs
* these values, and is only called once.
*/
private static void initDatatypes() {
logger.config("Initializing standard datatypes");
supportedDatatypes = new HashMap<String, AttributeProxy>();
// the 1.x datatypes
supportedDatatypes.put(BooleanAttribute.identifier, new BooleanAttributeProxy());
supportedDatatypes.put(StringAttribute.identifier, new StringAttributeProxy());
supportedDatatypes.put(DateAttribute.identifier, new DateAttributeProxy());
supportedDatatypes.put(TimeAttribute.identifier, new TimeAttributeProxy());
supportedDatatypes.put(DateTimeAttribute.identifier, new DateTimeAttributeProxy());
supportedDatatypes.put(DayTimeDurationAttribute.identifier,
new DayTimeDurationAttributeProxy());
supportedDatatypes.put(YearMonthDurationAttribute.identifier,
new YearMonthDurationAttributeProxy());
supportedDatatypes.put(DoubleAttribute.identifier, new DoubleAttributeProxy());
supportedDatatypes.put(IntegerAttribute.identifier, new IntegerAttributeProxy());
supportedDatatypes.put(AnyURIAttribute.identifier, new AnyURIAttributeProxy());
supportedDatatypes.put(HexBinaryAttribute.identifier, new HexBinaryAttributeProxy());
supportedDatatypes.put(Base64BinaryAttribute.identifier, new Base64BinaryAttributeProxy());
supportedDatatypes.put(X500NameAttribute.identifier, new X500NameAttributeProxy());
supportedDatatypes.put(RFC822NameAttribute.identifier, new RFC822NameAttributeProxy());
supportedV1Identifiers = Collections.unmodifiableSet(supportedDatatypes.keySet());
// the 2.0 datatypes
supportedDatatypes.put(DNSNameAttribute.identifier, new DNSNameAttributeProxy());
supportedDatatypes.put(IPAddressAttribute.identifier, new IPAddressAttributeProxy());
supportedV2Identifiers = Collections.unmodifiableSet(supportedDatatypes.keySet());
}
/**
* Returns an instance of this factory. This method enforces a singleton model, meaning that
* this always returns the same instance, creating the factory if it hasn't been requested
* before. This is the default model used by the <code>AttributeFactory</code>, ensuring quick
* access to this factory.
*
* @return the factory instance
*/
public static StandardAttributeFactory getFactory() {
if (factoryInstance == null) {
synchronized (StandardAttributeFactory.class) {
if (factoryInstance == null) {
initDatatypes();
factoryInstance = new StandardAttributeFactory();
}
}
}
return factoryInstance;
}
/**
* A convenience method that returns a new instance of an <codeAttributeFactory</code> that
* supports all of the standard datatypes. The new factory allows adding support for new
* datatypes. This method should only be used when you need a new, mutable instance (eg, when
* you want to create a new factory that extends the set of supported datatypes). In general,
* you should use <code>getFactory</code> which is more efficient and enforces a singleton
* pattern.
*
* @return a new factory supporting the standard datatypes
*/
public static AttributeFactory getNewFactory() {
// first we make sure that everything has been initialized...
getFactory();
// ...then we create the new instance
return new BaseAttributeFactory(supportedDatatypes);
}
/**
* Returns the identifiers supported for the given version of XACML. Because this factory
* supports identifiers from all versions of the XACML specifications, this method is useful for
* getting a list of which specific identifiers are supported by a given version of XACML.
*
* @param xacmlVersion
* a standard XACML identifier string, as provided in <code>PolicyMetaData</code>
*
* @return a <code>Set</code> of identifiers
*
* @throws UnknownIdentifierException
* if the version string is unknown
*/
public static Set<String> getStandardDatatypes(String xacmlVersion)
throws UnknownIdentifierException {
if (xacmlVersion.equals(PolicyMetaData.XACML_1_0_IDENTIFIER)) {
return supportedV1Identifiers;
} else if (xacmlVersion.equals(PolicyMetaData.XACML_2_0_IDENTIFIER)) {
return supportedV2Identifiers;
}
throw new UnknownIdentifierException("Unknown XACML version: " + xacmlVersion);
}
/**
* Throws an <code>UnsupportedOperationException</code> since you are not allowed to modify what
* a standard factory supports.
*
* @param id
* the name of the attribute type
* @param proxy
* the proxy used to create new attributes of the given type
*
* @throws UnsupportedOperationException
* always
*/
public void addDatatype(String id, AttributeProxy proxy) {
throw new UnsupportedOperationException("a standard factory cannot "
+ "support new datatypes");
}
}