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The Policy.java Java example source code
/*
* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.xml.internal.ws.policy;
import com.sun.xml.internal.ws.policy.sourcemodel.wspolicy.NamespaceVersion;
import com.sun.xml.internal.ws.policy.privateutil.LocalizationMessages;
import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import javax.xml.namespace.QName;
/**
* A policy represents normalized policy as a wrapper of available policy alternatives represented by
* child {@link AssertionSet AssertionSets}.
*
* @author Fabian Ritzmann, Marek Potociar
*/
public class Policy implements Iterable<AssertionSet> {
/**
* A string constant used in package private constructor to customize the object's toString() method output.
*/
private static final String POLICY_TOSTRING_NAME = "policy";
/**
* Constant represents empty list of assertion sets. This represents the content of a 'NULL' policy - a policy with
* no alternatives. The constant supports memory effective creation of 'NULL' policy objects.
*/
private static final List<AssertionSet> NULL_POLICY_ASSERTION_SETS = Collections.unmodifiableList(new LinkedList());
/**
* Constant represents list of assertion sets with single empty assertion set. This represents the content of
* an 'EMPTY' policy - a policy with a single empty alternative. The constant supports memory effective creation
* of 'EMPTY' policy objects.
*/
private static final List<AssertionSet> EMPTY_POLICY_ASSERTION_SETS = Collections.unmodifiableList(new LinkedList(Arrays.asList(new AssertionSet[] {AssertionSet.emptyAssertionSet()})));
/**
* Constant represents empty vocabulary of a 'NULL' or 'EMPTY' policies. The constant supports memory effective
* creation of 'NULL' and 'EMPTY' policy objects.
*/
private static final Set<QName> EMPTY_VOCABULARY = Collections.unmodifiableSet(new TreeSet(PolicyUtils.Comparison.QNAME_COMPARATOR));
/**
* Constant representation of all 'NULL' policies returned by createNullPolicy() factory method. This is to optimize
* the memory footprint.
*/
private static final Policy ANONYMOUS_NULL_POLICY = new Policy(null, null, NULL_POLICY_ASSERTION_SETS, EMPTY_VOCABULARY);
/**
* Constant representation of all 'EMPTY' policies returned by createEmptyPolicy() factory method. This constant is
* to optimize the memory footprint.
*/
private static final Policy ANONYMOUS_EMPTY_POLICY = new Policy(null, null, EMPTY_POLICY_ASSERTION_SETS, EMPTY_VOCABULARY);
/**
* Policy ID holder
*/
private String policyId;
/**
* Policy name holder
*/
private String name;
/**
* Namespace version holder
*/
private NamespaceVersion nsVersion;
/**
* internal collection of policy alternatives
*/
private final List<AssertionSet> assertionSets;
/**
* internal collection of policy vocabulary entries (qualified names of all assertion types present in the policy expression)
*/
private final Set<QName> vocabulary;
/**
* immutable version of policy vocabulary that is made available to clients via getter method
*/
private final Collection<QName> immutableVocabulary;
/**
* policy object name used in a toString() method. This ensures that Policy class children can customize
* (via package private Policy constructors) the toString() method without having to override it.
*/
private final String toStringName;
/**
* The factory method creates an <b>immutable policy instance which represents a 'nothing allowed'
* policy expression. The policy is created using the latest namespace version supported.
*
* @return policy instance which represents a <emph>'nothing allowed' (no policy alternatives).
*/
public static Policy createNullPolicy() {
return ANONYMOUS_NULL_POLICY;
}
/**
* The factory method creates an <b>immutable policy instance which represents a 'anything allowed'
* policy expression. The policy is created using the latest namespace version supported.
*
* @return policy instance which represents a <emph>'anything allowed' (empty policy alternative with no plicy
* assertions prescribed).
*/
public static Policy createEmptyPolicy() {
return ANONYMOUS_EMPTY_POLICY;
}
/**
* The factory method creates an <b>immutable policy instance which represents a 'nothing allowed'
* policy expression. The policy is created using the latest namespace version supported.
*
* @param name global URI of the policy. May be {@code null}.
* @param policyId local URI of the policy. May be {@code null}.
* @return policy instance which represents a <emph>'nothing allowed' (no policy alternatives).
*/
public static Policy createNullPolicy(final String name, final String policyId) {
if (name == null && policyId == null) {
return ANONYMOUS_NULL_POLICY;
} else {
return new Policy(name, policyId, NULL_POLICY_ASSERTION_SETS, EMPTY_VOCABULARY);
}
}
/**
* The factory method creates an <b>immutable policy instance which represents a 'nothing allowed'
* policy expression. The policy is created using the latest namespace version supported.
*
* @param nsVersion Policy namespace version to be used when marshalling the policy expression
* @param name global URI of the policy. May be {@code null}.
* @param policyId local URI of the policy. May be {@code null}.
* @return policy instance which represents a <emph>'nothing allowed' (no policy alternatives).
*/
public static Policy createNullPolicy(final NamespaceVersion nsVersion, final String name, final String policyId) {
if ((nsVersion == null || nsVersion == NamespaceVersion.getLatestVersion()) && name == null && policyId == null) {
return ANONYMOUS_NULL_POLICY;
} else {
return new Policy(nsVersion, name, policyId, NULL_POLICY_ASSERTION_SETS, EMPTY_VOCABULARY);
}
}
/**
* The factory method creates an <b>immutable policy instance which represents a 'anything allowed'
* policy expression. The policy is created using the latest namespace version supported.
*
* @param name global URI of the policy. May be {@code null}.
* @param policyId local URI of the policy. May be {@code null}.
*
* @return policy instance which represents a <emph>'anything allowed' (empty policy alternative with no plicy
* assertions prescribed).
*/
public static Policy createEmptyPolicy(final String name, final String policyId) {
if (name == null && policyId == null) {
return ANONYMOUS_EMPTY_POLICY;
} else {
return new Policy(name, policyId, EMPTY_POLICY_ASSERTION_SETS, EMPTY_VOCABULARY);
}
}
/**
* The factory method creates an <b>immutable policy instance which represents a 'anything allowed'
* policy expression. The policy is created using the latest namespace version supported.
*
* @param nsVersion Policy namespace version to be used when marshalling the policy expression
* @param name global URI of the policy. May be {@code null}.
* @param policyId local URI of the policy. May be {@code null}.
*
* @return policy instance which represents a <emph>'anything allowed' (empty policy alternative with no plicy
* assertions prescribed).
*/
public static Policy createEmptyPolicy(final NamespaceVersion nsVersion, final String name, final String policyId) {
if ((nsVersion == null || nsVersion == NamespaceVersion.getLatestVersion()) && name == null && policyId == null) {
return ANONYMOUS_EMPTY_POLICY;
} else {
return new Policy(nsVersion, name, policyId, EMPTY_POLICY_ASSERTION_SETS, EMPTY_VOCABULARY);
}
}
/**
* The factory method creates an <b>immutable policy instance which represents a policy expression with
* alternatives specified by {@code sets} input parameter. If the collection of policy alternatives is null or empty
* an object representing a 'NULL' policy expression is returned. However, in such case it is better to use
* {@link #createNullPolicy()} factory method directly. The policy is created using the latest namespace version supported.
*
* @param sets represents the collection of policy alternatives of the policy object created. During the creation of
* the new policy object, the content of the alternatives collection is copied into an internal policy object structure,
* thus any subsequent operations on the collection will have no impact on the newly constructed policy object.
*
* @return policy instance which represents the policy with given alternatives.
*/
public static Policy createPolicy(final Collection<AssertionSet> sets) {
if (sets == null || sets.isEmpty()) {
return createNullPolicy();
} else {
return new Policy(POLICY_TOSTRING_NAME, sets);
}
}
/**
* The factory method creates an <b>immutable policy instance which represents a policy expression with
* alternatives specified by {@code sets} input parameter. If the collection of policy alternatives is null or empty
* an object representing a 'NULL' policy expression is returned. However, in such case it is better to use
* {@link #createNullPolicy(String, String)} factory method directly. The policy is created using the latest namespace version supported.
*
* @param name global URI of the policy. May be {@code null}.
* @param policyId local URI of the policy. May be {@code null}.
* @param sets represents the collection of policy alternatives of the policy object created. During the creation of
* the new policy object, the content of the alternatives collection is copied into an internal policy object structure,
* thus any subsequent operations on the collection will have no impact on the newly constructed policy object.
*
* @return policy instance which represents the policy with given alternatives.
*/
public static Policy createPolicy(final String name, final String policyId, final Collection<AssertionSet> sets) {
if (sets == null || sets.isEmpty()) {
return createNullPolicy(name, policyId);
} else {
return new Policy(POLICY_TOSTRING_NAME, name, policyId, sets);
}
}
/**
* The factory method creates an <b>immutable policy instance which represents a policy expression with
* alternatives specified by {@code sets} input parameter. If the collection of policy alternatives is null or empty
* an object representing a 'NULL' policy expression is returned. However, in such case it is better to use
* {@link #createNullPolicy(String, String)} factory method directly. The policy is created using the latest namespace version supported.
*
* @param nsVersion Policy namespace version to be used when marshalling the policy expression
* @param name global URI of the policy. May be {@code null}.
* @param policyId local URI of the policy. May be {@code null}.
* @param sets represents the collection of policy alternatives of the policy object created. During the creation of
* the new policy object, the content of the alternatives collection is copied into an internal policy object structure,
* thus any subsequent operations on the collection will have no impact on the newly constructed policy object.
*
* @return policy instance which represents the policy with given alternatives.
*/
public static Policy createPolicy(NamespaceVersion nsVersion, final String name, final String policyId, final Collection<AssertionSet> sets) {
if (sets == null || sets.isEmpty()) {
return createNullPolicy(nsVersion, name, policyId);
} else {
return new Policy(nsVersion, POLICY_TOSTRING_NAME, name, policyId, sets);
}
}
/**
* A most flexible policy object constructor that allows private creation of policy objects and direct setting
* of all its attributes.
*
* @param name global URI of the policy. May be {@code null}.
* @param policyId local URI of the policy. May be {@code null}.
* @param assertionSets represents the collection of policy alternatives of the policy object created. The list is directly
* assigned to the policy object internal attribute. Subsequent manipulations on the collection must be handled with
* care.
* @param vocabulary represents the vocabulary of the policy object. Subsequent manipulations on the collection
* must be handled with care.
*/
private Policy(final String name, final String policyId, final List<AssertionSet> assertionSets, final Set vocabulary) {
this.nsVersion = NamespaceVersion.getLatestVersion();
this.toStringName = POLICY_TOSTRING_NAME;
this.name = name;
this.policyId = policyId;
this.assertionSets = assertionSets;
this.vocabulary = vocabulary;
this.immutableVocabulary = Collections.unmodifiableCollection(this.vocabulary);
}
/**
* Constructor that should be overridden by child implementation. The constructor allows for easy toString() output
* customization.
*
* @param toStringName a general name of the object (such as 'policy' or 'nested policy') that will be used in the
* toString() method to identify the object.
* @param sets represents the collection of policy alternatives of the policy object created. During the creation of
* the new policy object, the content of the alternatives collection is copied into an internal policy object structure,
* thus any subsequent operations on the collection will have no impact on the newly constructed policy object. The
* collection may be {@code null} or empty. In such case a 'NULL' policy object is constructed.
*/
Policy(final String toStringName, final Collection<AssertionSet> sets) {
this.nsVersion = NamespaceVersion.getLatestVersion();
this.toStringName = toStringName;
if (sets == null || sets.isEmpty()) {
this.assertionSets = NULL_POLICY_ASSERTION_SETS;
this.vocabulary = EMPTY_VOCABULARY;
this.immutableVocabulary = EMPTY_VOCABULARY;
} else {
this.assertionSets = new LinkedList<AssertionSet>();
this.vocabulary = new TreeSet<QName>(PolicyUtils.Comparison.QNAME_COMPARATOR);
this.immutableVocabulary = Collections.unmodifiableCollection(this.vocabulary);
addAll(sets);
}
}
/**
* Constructor that should be overridden by child implementation. The constructor allows for easy toString() output
* customization.
*
* @param toStringName a general name of the object (such as 'policy' or 'nested policy') that will be used in the
* toString() method to identify the object.
* @param name global URI of the policy. May be {@code null}.
* @param policyId local URI of the policy. May be {@code null}.
* @param sets represents the collection of policy alternatives of the policy object created. During the creation of
* the new policy object, the content of the alternatives collection is copied into an internal policy object structure,
* thus any subsequent operations on the collection will have no impact on the newly constructed policy object. The
* collection may be {@code null} or empty. In such case a 'NULL' policy object is constructed.
*/
Policy(final String toStringName, final String name, final String policyId, final Collection<AssertionSet> sets) {
this(toStringName, sets);
this.name = name;
this.policyId = policyId;
}
/**
* A most flexible policy object constructor that allows private creation of policy objects and direct setting
* of all its attributes.
*
* @param nsVersion Policy namespace version to be used when marshalling the policy expression
* @param name global URI of the policy. May be {@code null}.
* @param policyId local URI of the policy. May be {@code null}.
* @param assertionSets represents the collection of policy alternatives of the policy object created. The list is directly
* assigned to the policy object internal attribute. Subsequent manipulations on the collection must be handled with
* care.
* @param vocabulary represents the vocabulary of the policy object. Subsequent manipulations on the collection
* must be handled with care.
*/
private Policy(final NamespaceVersion nsVersion, final String name, final String policyId, final List<AssertionSet> assertionSets, final Set vocabulary) {
this.nsVersion = nsVersion;
this.toStringName = POLICY_TOSTRING_NAME;
this.name = name;
this.policyId = policyId;
this.assertionSets = assertionSets;
this.vocabulary = vocabulary;
this.immutableVocabulary = Collections.unmodifiableCollection(this.vocabulary);
}
/**
* Constructor that should be overridden by child implementation. The constructor allows for easy toString() output
* customization.
*
* @param nsVersion Policy namespace version to be used when marshalling the policy expression
* @param toStringName a general name of the object (such as 'policy' or 'nested policy') that will be used in the
* toString() method to identify the object.
* @param sets represents the collection of policy alternatives of the policy object created. During the creation of
* the new policy object, the content of the alternatives collection is copied into an internal policy object structure,
* thus any subsequent operations on the collection will have no impact on the newly constructed policy object. The
* collection may be {@code null} or empty. In such case a 'NULL' policy object is constructed.
*/
Policy(final NamespaceVersion nsVersion, final String toStringName, final Collection<AssertionSet> sets) {
this.nsVersion = nsVersion;
this.toStringName = toStringName;
if (sets == null || sets.isEmpty()) {
this.assertionSets = NULL_POLICY_ASSERTION_SETS;
this.vocabulary = EMPTY_VOCABULARY;
this.immutableVocabulary = EMPTY_VOCABULARY;
} else {
this.assertionSets = new LinkedList<AssertionSet>();
this.vocabulary = new TreeSet<QName>(PolicyUtils.Comparison.QNAME_COMPARATOR);
this.immutableVocabulary = Collections.unmodifiableCollection(this.vocabulary);
addAll(sets);
}
}
/**
* Constructor that should be overridden by child implementation. The constructor allows for easy toString() output
* customization.
*
* @param nsVersion Policy namespace version to be used when marshalling the policy expression
* @param toStringName a general name of the object (such as 'policy' or 'nested policy') that will be used in the
* toString() method to identify the object.
* @param name global URI of the policy. May be {@code null}.
* @param policyId local URI of the policy. May be {@code null}.
* @param sets represents the collection of policy alternatives of the policy object created. During the creation of
* the new policy object, the content of the alternatives collection is copied into an internal policy object structure,
* thus any subsequent operations on the collection will have no impact on the newly constructed policy object. The
* collection may be {@code null} or empty. In such case a 'NULL' policy object is constructed.
*/
Policy(final NamespaceVersion nsVersion, final String toStringName, final String name, final String policyId, final Collection<AssertionSet> sets) {
this(nsVersion, toStringName, sets);
this.name = name;
this.policyId = policyId;
}
/**
* Adds single alternative to the internal alternatives set of the policy object.
*
* @param set assertion set (policy alternative) object to be added. May be {@code null}; in such case the method
* returns false.
*
* @return {@code true} or {@code false} depending on whether the new alternative was added to the policy object or not.
*/
private boolean add(final AssertionSet set) {
if (set == null) {
return false;
}
if (this.assertionSets.contains(set)) {
return false;
} else {
this.assertionSets.add(set);
this.vocabulary.addAll(set.getVocabulary());
return true;
}
}
/**
* Adds all alternatives from the input collection of assertion sets to the policy object's internal set of alternatives.
* The policy object's vocabulary structure is updated as well.
*
* @param sets collection of new alternatives. Must NOT be {@code null} or empty. The check for null or empty input
* parameter is performed with help of {@code assert} keyword, thus during the testing and development of this class
* {@code -ea} switch should be turned on for this class.
*
* @return {@code true} if all elements in the input collection were added to internal structure, {@code false} otherwise.
*/
private boolean addAll(final Collection<AssertionSet> sets) {
assert (sets != null && !sets.isEmpty()) : LocalizationMessages.WSP_0036_PRIVATE_METHOD_DOES_NOT_ACCEPT_NULL_OR_EMPTY_COLLECTION();
boolean result = true;
for (AssertionSet set : sets) {
result &= add(set); // this is here to ensure that vocabulary is built correctly as well
}
Collections.sort(this.assertionSets);
return result;
}
Collection<AssertionSet> getContent() {
return assertionSets;
}
/**
* Returns the policy identifier that serves as a local relative policy URI.
*
* @return policy identifier - a local relative policy URI. If no policy identifier is set, returns {@code null}.
*/
public String getId() {
return policyId;
}
/**
* Returns the policy name that serves as a global policy URI.
*
* @return policy name - a global policy URI. If no policy name is set, returns {@code null}.
*/
public String getName() {
return name;
}
public NamespaceVersion getNamespaceVersion() {
return nsVersion;
}
/**
* Returns the policy ID or if that is null the policy name. May return null
* if both attributes are null.
*
* @see #getId()
* @see #getName()
* @return The policy ID if it was set, or the name or null if no attribute was set.
*/
public String getIdOrName() {
if (policyId != null) {
return policyId;
}
return name;
}
/**
* Method returns how many policy alternatives this policy instance contains.
*
* @return number of policy alternatives contained in this policy instance
*/
public int getNumberOfAssertionSets() {
return assertionSets.size();
}
/**
* A policy usually contains one or more assertion sets. Each assertion set
* corresponds to a policy alternative as defined by WS-Policy.
*
* @return An iterator to iterate through all contained assertion sets
*/
public Iterator<AssertionSet> iterator() {
return assertionSets.iterator();
}
/**
* Returns {@code true} if the policy instance represents "nothing allowed" policy expression
*
* @return {@code true} if the policy instance represents "nothing allowed" policy expression, {@code false} otherwise.
*/
public boolean isNull() {
return assertionSets.size() == 0;
}
/**
* Returns {@code true} if the policy instance represents "anything allowed" policy expression
*
* @return {@code true} if the policy instance represents "anything allowed" policy expression, {@code false} otherwise.
*/
public boolean isEmpty() {
return assertionSets.size() == 1 && assertionSets.get(0).isEmpty();
}
/**
* Returns true if the policy contains the assertion names with specified namespace in its vocabulary
*
* @param namespaceUri the assertion namespace URI (identifying assertion domain)
* @return {@code true}, if an assertion with the given name could be found in the policy vocabulary {@code false} otherwise.
*/
public boolean contains(final String namespaceUri) {
for (QName entry : vocabulary) {
if (entry.getNamespaceURI().equals(namespaceUri)) {
return true;
}
}
return false;
}
/**
* Retrieves the vocabulary of this policy expression. The vocabulary is represented by an immutable collection of
* unique QName objects. Each of those objects represents single assertion type contained in the policy.
*
* @return immutable collection of assertion types contained in the policy (a policy vocabulary).
*/
public Collection<QName> getVocabulary() {
return immutableVocabulary;
}
/**
* Determines if the policy instance contains the assertion with the name specified in its vocabulary.
*
* @param assertionName the name of the assertion to be tested.
*
* @return {@code true} if the assertion with the specified name is part of the policy instance's vocabulary,
* {@code false} otherwise.
*/
public boolean contains(final QName assertionName) {
return vocabulary.contains(assertionName);
}
/**
* An {@code Object.equals(Object obj)} method override.
*/
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof Policy)) {
return false;
}
final Policy that = (Policy) obj;
boolean result = true;
result = result && this.vocabulary.equals(that.vocabulary);
result = result && this.assertionSets.size() == that.assertionSets.size() && this.assertionSets.containsAll(that.assertionSets);
return result;
}
/**
* An {@code Object.hashCode()} method override.
*/
@Override
public int hashCode() {
int result = 17;
result = 37 * result + vocabulary.hashCode();
result = 37 * result + assertionSets.hashCode();
return result;
}
/**
* An {@code Object.toString()} method override.
*/
@Override
public String toString() {
return toString(0, new StringBuffer()).toString();
}
/**
* A helper method that appends indented string representation of this instance to the input string buffer.
*
* @param indentLevel indentation level to be used.
* @param buffer buffer to be used for appending string representation of this instance
* @return modified buffer containing new string representation of the instance
*/
StringBuffer toString(final int indentLevel, final StringBuffer buffer) {
final String indent = PolicyUtils.Text.createIndent(indentLevel);
final String innerIndent = PolicyUtils.Text.createIndent(indentLevel + 1);
final String innerDoubleIndent = PolicyUtils.Text.createIndent(indentLevel + 2);
buffer.append(indent).append(toStringName).append(" {").append(PolicyUtils.Text.NEW_LINE);
buffer.append(innerIndent).append("namespace version = '").append(nsVersion.name()).append('\'').append(PolicyUtils.Text.NEW_LINE);
buffer.append(innerIndent).append("id = '").append(policyId).append('\'').append(PolicyUtils.Text.NEW_LINE);
buffer.append(innerIndent).append("name = '").append(name).append('\'').append(PolicyUtils.Text.NEW_LINE);
buffer.append(innerIndent).append("vocabulary {").append(PolicyUtils.Text.NEW_LINE);
if (vocabulary.isEmpty()) {
buffer.append(innerDoubleIndent).append("no entries").append(PolicyUtils.Text.NEW_LINE);
} else {
int index = 1;
for (QName entry : vocabulary) {
buffer.append(innerDoubleIndent).append(index++).append(". entry = '").append(entry.getNamespaceURI()).append(':').append(entry.getLocalPart()).append('\'').append(PolicyUtils.Text.NEW_LINE);
}
}
buffer.append(innerIndent).append('}').append(PolicyUtils.Text.NEW_LINE);
if (assertionSets.isEmpty()) {
buffer.append(innerIndent).append("no assertion sets").append(PolicyUtils.Text.NEW_LINE);
} else {
for (AssertionSet set : assertionSets) {
set.toString(indentLevel + 1, buffer).append(PolicyUtils.Text.NEW_LINE);
}
}
buffer.append(indent).append('}');
return buffer;
}
}
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