/*
* JBoss, Home of Professional Open Source.
* Copyright 2016 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wildfly.security.auth.server;
import static org.wildfly.common.math.HashMath.multiHashOrdered;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.StreamSupport;
import org.wildfly.common.Assert;
import org.wildfly.security.credential.source.CredentialSource;
import org.wildfly.security.auth.SupportLevel;
import org.wildfly.security.credential.AlgorithmCredential;
import org.wildfly.security.credential.Credential;
import org.wildfly.security.evidence.Evidence;
import org.wildfly.security.util.EnumerationIterator;
/**
* The public or private credentials retained by an identity, which can be used for authentication forwarding. This
* credentials set can contain zero or one credential of a given type and algorithm name. If the credential type
* does not support algorithm names, then the set can contain zero or one credential of that type. The credential
* set may be iterated; iteration order is not prescribed and may change if the implementation is changed.
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
public abstract class IdentityCredentials implements Iterable<Credential>, CredentialSource {
IdentityCredentials() {
}
/**
* Determine whether a credential of the given type is present in this set.
*
* @param credentialType the credential type class (must not be {@code null})
* @return {@code true} if a matching credential is contained in this set, {@code false} otherwise
*/
public final boolean contains(Class<? extends Credential> credentialType) {
return contains(credentialType, null);
}
@Override
public final SupportLevel getCredentialAcquireSupport(final Class<? extends Credential> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
return contains(credentialType, algorithmName, parameterSpec) ? SupportLevel.SUPPORTED : SupportLevel.UNSUPPORTED;
}
@Override
public final SupportLevel getCredentialAcquireSupport(final Class<? extends Credential> credentialType, final String algorithmName) {
return contains(credentialType, algorithmName) ? SupportLevel.SUPPORTED : SupportLevel.UNSUPPORTED;
}
@Override
public final SupportLevel getCredentialAcquireSupport(final Class<? extends Credential> credentialType) {
return contains(credentialType) ? SupportLevel.SUPPORTED : SupportLevel.UNSUPPORTED;
}
/**
* Determine whether a credential of the given type and algorithm are present in this set.
*
* @param credentialType the credential type class (must not be {@code null})
* @param algorithmName the algorithm name, or {@code null} if any algorithm is acceptable or the credential type
* does not support algorithm names
* @param parameterSpec the parameter specification or {@code null} if any parameter specification is acceptable
* @return {@code true} if a matching credential is contained in this set, {@code false} otherwise
*/
public abstract boolean contains(Class<? extends Credential> credentialType, String algorithmName, AlgorithmParameterSpec parameterSpec);
/**
* Determine whether a credential of the given type and algorithm are present in this set.
*
* @param credentialType the credential type class (must not be {@code null})
* @param algorithmName the algorithm name, or {@code null} if any algorithm is acceptable or the credential type
* does not support algorithm names
* @return {@code true} if a matching credential is contained in this set, {@code false} otherwise
*/
public final boolean contains(Class<? extends Credential> credentialType, String algorithmName) {
Assert.checkNotNullParam("credentialType", credentialType);
return contains(credentialType, algorithmName, null);
}
/**
* Determine whether a credential of the type, algorithm, and parameters of the given credential is present in this set.
*
* @param credential the credential to check against (must not be {@code null})
* @return {@code true} if a matching credential is contained in this set, {@code false} otherwise
*/
public final boolean containsMatching(Credential credential) {
Assert.checkNotNullParam("credential", credential);
if (credential instanceof AlgorithmCredential) {
final AlgorithmCredential algorithmCredential = (AlgorithmCredential) credential;
return contains(credential.getClass(), algorithmCredential.getAlgorithm(), algorithmCredential.getParameters());
} else {
return contains(credential.getClass(), null, null);
}
}
/**
* Acquire a credential of the given type.
*
* @param credentialType the credential type class (must not be {@code null})
* @param <C> the credential type
* @return the credential, or {@code null} if no such credential exists
*/
@Override
public final <C extends Credential> C getCredential(Class<C> credentialType) {
return getCredential(credentialType, null, null);
}
/**
* Acquire a credential of the given type and algorithm name.
*
* @param credentialType the credential type class (must not be {@code null})
* @param algorithmName the algorithm name, or {@code null} if any algorithm is acceptable or the credential type
* does not support algorithm names
* @param <C> the credential type
* @return the credential, or {@code null} if no such credential exists
*/
@Override
public final <C extends Credential> C getCredential(final Class<C> credentialType, final String algorithmName) {
return getCredential(credentialType, algorithmName, null);
}
/**
* Acquire a credential of the given type and algorithm name.
*
* @param credentialType the credential type class (must not be {@code null})
* @param algorithmName the algorithm name, or {@code null} if any algorithm is acceptable or the credential type
* does not support algorithm names
* @param parameterSpec the parameter specification or {@code null} if any parameter specification is acceptable
* @param <C> the credential type
*
* @return the credential, or {@code null} if no such credential exists
*/
@Override
public abstract <C extends Credential> C getCredential(Class<C> credentialType, String algorithmName, AlgorithmParameterSpec parameterSpec);
/**
* Apply the given function to the acquired credential, if it is set and of the given type.
*
* @param credentialType the credential type class (must not be {@code null})
* @param function the function to apply (must not be {@code null})
* @param <C> the credential type
* @param <R> the return type
* @return the result of the function, or {@code null} if the criteria are not met
*/
@Override
public final <C extends Credential, R> R applyToCredential(Class<C> credentialType, Function<C, R> function) {
final Credential credential = getCredential(credentialType);
return credential == null ? null : credential.castAndApply(credentialType, function);
}
/**
* Apply the given function to the acquired credential, if it is set and of the given type and algorithm.
*
* @param credentialType the credential type class (must not be {@code null})
* @param algorithmName the algorithm name
* @param function the function to apply (must not be {@code null})
* @param <C> the credential type
* @param <R> the return type
* @return the result of the function, or {@code null} if the criteria are not met
*/
@Override
public final <C extends Credential, R> R applyToCredential(Class<C> credentialType, String algorithmName, Function<C, R> function) {
final Credential credential = getCredential(credentialType, algorithmName);
return credential == null ? null : credential.castAndApply(credentialType, algorithmName, function);
}
/**
* Apply the given function to the acquired credential, if it is set and of the given type and algorithm.
*
* @param credentialType the credential type class (must not be {@code null})
* @param algorithmName the algorithm name
* @param function the function to apply (must not be {@code null})
* @param <C> the credential type
* @param <R> the return type
* @return the result of the function, or {@code null} if the criteria are not met
*/
@Override
public <C extends Credential, R> R applyToCredential(final Class<C> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec, final Function<C, R> function) {
final Credential credential = getCredential(credentialType, algorithmName, parameterSpec);
return credential == null ? null : credential.castAndApply(credentialType, algorithmName, parameterSpec, function);
}
/**
* Return a copy of this credential set, but with the given credential added to it.
*
* @param credential the credential to append (must not be {@code null})
* @return the new credential set (not {@code null})
*/
public abstract IdentityCredentials withCredential(Credential credential);
/**
* Return a copy of this credential set with the given credential set added to it.
*
* @param other the credential set to append (must not be {@code null})
* @return the new credential set (not {@code null})
*/
public abstract IdentityCredentials with(IdentityCredentials other);
/**
* Return a copy of this credential set without any credentials with a type, algorithm name, and parameters matching that of the
* given credential. If the credential type, algorithm name, and parameters are not found in this set, return this instance.
*
* @param credential the credential to match against (must not be {@code null})
* @return the new credential set (not {@code null})
*/
public IdentityCredentials withoutMatching(Credential credential) {
Assert.checkNotNullParam("credential", credential);
return without(credential::matches);
}
/**
* Return a copy of this credential set without any credentials of the given type. If the credential type is not
* found in this set, return this instance.
*
* @param credentialType the credential type to remove (must not be {@code null})
* @return the new credential set (not {@code null})
*/
public final IdentityCredentials without(Class<? extends Credential> credentialType) {
Assert.checkNotNullParam("credentialType", credentialType);
return without(credentialType::isInstance);
}
/**
* Return a copy of this credential set without any credentials of the given type and algorithm name. If the
* credential type and algorithm name is not found in this set, return this instance.
*
* @param credentialType the credential type to remove (must not be {@code null})
* @param algorithmName the algorithm name to remove, or {@code null} to match any algorithm name
* @return the new credential set (not {@code null})
*/
public final IdentityCredentials without(final Class<? extends Credential> credentialType, final String algorithmName) {
Assert.checkNotNullParam("credentialType", credentialType);
return without(credentialType, algorithmName, null);
}
public IdentityCredentials without(final Class<? extends Credential> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
Assert.checkNotNullParam("credentialType", credentialType);
return without(c -> c.matches(credentialType, algorithmName, parameterSpec));
}
/**
* Return a copy of this credential set without any credentials that match the predicate. If no credentials match
* the predicate, return this instance.
*
* @param predicate the predicate to test (must not be {@code null})
* @return the new credential set (not {@code null})
*/
public abstract IdentityCredentials without(Predicate<? super Credential> predicate);
/**
* Return a copy of this credential set without any credentials of the given type that match the predicate. If no credentials match
* the predicate, return this instance.
*
* @param credentialType the credential type class
* @param predicate the predicate to test (must not be {@code null})
* @param <C> the credential type
* @return the new credential set (not {@code null})
*/
public final <C extends Credential> IdentityCredentials without(Class<C> credentialType, Predicate<? super C> predicate) {
return without(c -> credentialType.isInstance(c) && predicate.test(credentialType.cast(c)));
}
/**
* Get a {@link Spliterator} for this credential set.
*
* @return the spliterator (not {@code null})
*/
public Spliterator<Credential> spliterator() {
return Spliterators.spliterator(iterator(), size(), Spliterator.IMMUTABLE | Spliterator.DISTINCT | Spliterator.NONNULL | Spliterator.ORDERED | Spliterator.SIZED);
}
public boolean canVerify(Class<? extends Evidence> evidenceClass, String algorithmName) {
return StreamSupport.stream(spliterator(), false)
.filter(credential -> credential.canVerify(evidenceClass, algorithmName))
.count() != 0;
}
public boolean canVerify(Evidence evidence) {
return StreamSupport.stream(spliterator(), false)
.filter(credential -> credential.canVerify(evidence))
.count() != 0;
}
public boolean verify(Evidence evidence) {
return StreamSupport.stream(spliterator(), false)
.filter(credential -> credential.canVerify(evidence))
.filter(credential -> credential.verify(evidence))
.count() != 0;
}
/**
* Get the size of this credential set.
*
* @return the size of this credential set
*/
public abstract int size();
/**
* The empty credentials object.
*/
public static final IdentityCredentials NONE = new IdentityCredentials() {
public boolean contains(final Class<? extends Credential> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
Assert.checkNotNullParam("credentialType", credentialType);
return false;
}
public <C extends Credential> C getCredential(final Class<C> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
Assert.checkNotNullParam("credentialType", credentialType);
return null;
}
public IdentityCredentials with(final IdentityCredentials other) {
Assert.checkNotNullParam("other", other);
return other;
}
public IdentityCredentials withCredential(final Credential credential) {
Assert.checkNotNullParam("credential", credential);
return new One(credential);
}
public CredentialSource with(final CredentialSource other) {
Assert.checkNotNullParam("other", other);
return other;
}
public Iterator<Credential> iterator() {
return Collections.emptyIterator();
}
public <C extends Credential, R> R applyToCredential(final Class<C> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec, final Function<C, R> function) {
Assert.checkNotNullParam("credentialType", credentialType);
return null;
}
public IdentityCredentials withoutMatching(final Credential credential) {
Assert.checkNotNullParam("credential", credential);
return this;
}
public IdentityCredentials without(final Class<? extends Credential> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
Assert.checkNotNullParam("credentialType", credentialType);
return this;
}
public IdentityCredentials without(final Predicate<? super Credential> predicate) {
Assert.checkNotNullParam("predicate", predicate);
return this;
}
public Spliterator<Credential> spliterator() {
return Spliterators.emptySpliterator();
}
public void forEach(final Consumer<? super Credential> action) {
Assert.checkNotNullParam("action", action);
}
public int size() {
return 0;
}
public int hashCode() {
return 0;
}
public boolean equals(Object o) {
return o == this;
}
};
static class One extends IdentityCredentials {
private final Credential credential;
One(final Credential credential) {
this.credential = credential;
}
public boolean contains(final Class<? extends Credential> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
Assert.checkNotNullParam("credentialType", credentialType);
return credential.matches(credentialType, algorithmName, parameterSpec);
}
public <C extends Credential> C getCredential(final Class<C> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
Assert.checkNotNullParam("credentialType", credentialType);
return credential.matches(credentialType, algorithmName, parameterSpec) ? credentialType.cast(credential.clone()) : null;
}
public IdentityCredentials withCredential(final Credential credential) {
Assert.checkNotNullParam("credential", credential);
if (this.credential.matches(credential)) {
return new One(credential);
} else {
return new Two(this.credential, credential);
}
}
public IdentityCredentials with(final IdentityCredentials other) {
Assert.checkNotNullParam("other", other);
if (other == NONE) {
return this;
} else if (other instanceof One) {
return withCredential(((One) other).credential);
} else {
return other.with(this);
}
}
public CredentialSource with(final CredentialSource other) {
Assert.checkNotNullParam("other", other);
if (other instanceof IdentityCredentials) {
return with((IdentityCredentials) other);
} else {
return super.with(other);
}
}
public Iterator<Credential> iterator() {
return EnumerationIterator.over(credential);
}
public <C extends Credential, R> R applyToCredential(final Class<C> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec, final Function<C, R> function) {
Assert.checkNotNullParam("credentialType", credentialType);
return credential.castAndApply(credentialType, algorithmName, parameterSpec, function);
}
public IdentityCredentials withoutMatching(final Credential credential) {
Assert.checkNotNullParam("credential", credential);
return this.credential.matches(credential) ? NONE : this;
}
public IdentityCredentials without(final Class<? extends Credential> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
Assert.checkNotNullParam("credentialType", credentialType);
return credential.matches(credentialType, algorithmName, parameterSpec) ? NONE : this;
}
public IdentityCredentials without(final Predicate<? super Credential> predicate) {
Assert.checkNotNullParam("predicate", predicate);
return predicate.test(credential) ? NONE : this;
}
public void forEach(final Consumer<? super Credential> action) {
Assert.checkNotNullParam("action", action);
action.accept(credential);
}
public int size() {
return 1;
}
public int hashCode() {
return typeHash(credential);
}
public boolean equals(final Object obj) {
return obj instanceof One && ((One) obj).credential.equals(credential);
}
}
static class Two extends IdentityCredentials {
private final Credential credential1;
private final Credential credential2;
Two(final Credential credential1, final Credential credential2) {
this.credential1 = credential1;
this.credential2 = credential2;
}
public boolean contains(final Class<? extends Credential> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
Assert.checkNotNullParam("credentialType", credentialType);
return credential1.matches(credentialType, algorithmName, parameterSpec) || credential2.matches(credentialType, algorithmName, parameterSpec);
}
public <C extends Credential> C getCredential(final Class<C> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
Assert.checkNotNullParam("credentialType", credentialType);
return credential1.matches(credentialType, algorithmName, parameterSpec) ? credentialType.cast(credential1.clone()) :
credential2.matches(credentialType, algorithmName, parameterSpec) ? credentialType.cast(credential2.clone()) : null;
}
public IdentityCredentials withCredential(final Credential credential) {
Assert.checkNotNullParam("credential", credential);
if (credential.matches(credential1)) {
return new Two(credential2, credential);
} else if (credential.matches(credential2)) {
return new Two(credential1, credential);
} else {
return new Many(credential1, credential2, credential);
}
}
public IdentityCredentials with(final IdentityCredentials other) {
Assert.checkNotNullParam("other", other);
if (other == NONE) {
return this;
} else if (other instanceof One) {
return withCredential(((One) other).credential);
} else if (other instanceof Two) {
final Two otherTwo = (Two) other;
return withCredential(otherTwo.credential1).withCredential(otherTwo.credential2);
} else if (other instanceof Many) {
Many otherMany = (Many) other;
if (otherMany.containsMatching(credential1)) {
if (otherMany.containsMatching(credential2)) {
return otherMany;
} else {
return new Many(credential2, otherMany);
}
} else if (otherMany.containsMatching(credential2)) {
return new Many(credential1, otherMany);
} else {
return new Many(credential1, credential2, otherMany);
}
} else {
throw Assert.unreachableCode();
}
}
public CredentialSource with(final CredentialSource other) {
Assert.checkNotNullParam("other", other);
if (other instanceof IdentityCredentials) {
return with((IdentityCredentials) other);
} else {
return super.with(other);
}
}
public Iterator<Credential> iterator() {
return EnumerationIterator.over(credential1);
}
public <C extends Credential, R> R applyToCredential(final Class<C> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec, final Function<C, R> function) {
Assert.checkNotNullParam("credentialType", credentialType);
return credential1.castAndApply(credentialType, algorithmName, parameterSpec, function);
}
public IdentityCredentials withoutMatching(final Credential credential) {
Assert.checkNotNullParam("credential", credential);
return this.credential1.matches(credential) ? NONE : this;
}
public IdentityCredentials without(final Class<? extends Credential> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
Assert.checkNotNullParam("credentialType", credentialType);
return credential1.matches(credentialType, algorithmName, parameterSpec) ? NONE : this;
}
public IdentityCredentials without(final Predicate<? super Credential> predicate) {
Assert.checkNotNullParam("predicate", predicate);
return predicate.test(credential1) ? predicate.test(credential2) ? NONE : new One(credential2) : predicate.test(credential2) ? new One(credential1) : this;
}
public void forEach(final Consumer<? super Credential> action) {
Assert.checkNotNullParam("action", action);
action.accept(credential1);
action.accept(credential2);
}
public int size() {
return 2;
}
public int hashCode() {
return typeHash(credential1) ^ typeHash(credential2);
}
public boolean equals(final Object obj) {
if (! (obj instanceof Two)) {
return false;
}
final Two two = (Two) obj;
return credential1.equals(two.credential1) && credential2.equals(two.credential2) || credential1.equals(two.credential2) && credential2.equals(two.credential1);
}
}
/**
* A (hopefully) unique hash code for the kind of credential.
*
* @param credential the credential
* @return the type hash
*/
static int typeHash(Credential credential) {
int ch = credential.getClass().hashCode();
if (credential instanceof AlgorithmCredential) {
final AlgorithmCredential algorithmCredential = (AlgorithmCredential) credential;
return multiHashOrdered(multiHashOrdered(ch, 42979, Objects.hashCode(algorithmCredential.getAlgorithm())), 62861, Objects.hashCode(algorithmCredential.getParameters()));
} else {
return ch;
}
}
static class Many extends IdentityCredentials {
private final LinkedHashMap<Key, Credential> map;
private final int hashCode;
Many(final Credential c1, final Many subsequent) {
LinkedHashMap<Key, Credential> map = new LinkedHashMap<>(subsequent.map.size() + 1);
map.put(Key.of(c1), c1);
map.putAll(subsequent.map);
this.map = map;
int hc = 0;
for (Credential credential : map.values()) {
hc ^= typeHash(credential);
}
hashCode = hc;
assert size() > 2;
}
Many(final Credential c1, final Credential c2, final Many subsequent) {
LinkedHashMap<Key, Credential> map = new LinkedHashMap<>(subsequent.map.size() + 2);
map.put(Key.of(c1), c1);
map.put(Key.of(c2), c2);
map.putAll(subsequent.map);
this.map = map;
int hc = 0;
for (Credential credential : map.values()) {
hc ^= typeHash(credential);
}
hashCode = hc;
assert size() > 2;
}
Many(final LinkedHashMap<Key, Credential> map) {
this.map = map;
int hc = 0;
for (Credential credential : map.values()) {
hc ^= typeHash(credential);
}
hashCode = hc;
assert size() > 2;
}
Many(final Credential credential1, final Credential credential2, final Credential credential3) {
LinkedHashMap<Key, Credential> map = new LinkedHashMap<>(3);
map.put(Key.of(credential1), credential1);
map.put(Key.of(credential2), credential2);
map.put(Key.of(credential3), credential3);
this.map = map;
int hc = 0;
for (Credential credential : map.values()) {
hc ^= typeHash(credential);
}
hashCode = hc;
assert size() > 2;
}
public boolean contains(final Class<? extends Credential> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
return map.containsKey(new Key(credentialType, algorithmName, parameterSpec));
}
public <C extends Credential> C getCredential(final Class<C> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) {
return credentialType.cast(map.get(new Key(credentialType, algorithmName, parameterSpec)).clone());
}
public IdentityCredentials withoutMatching(final Credential credential) {
final Key key = Key.of(credential);
if (map.containsKey(key)) {
final LinkedHashMap<Key, Credential> clone = new LinkedHashMap<>(map);
clone.remove(key);
if (clone.size() == 2) {
final Iterator<Credential> iterator = clone.values().iterator();
return new Two(iterator.next(), iterator.next());
} else {
return new Many(clone);
}
} else {
return this;
}
}
public void forEach(final Consumer<? super Credential> action) {
map.values().forEach(action);
}
public int size() {
return map.size();
}
public IdentityCredentials withCredential(final Credential credential) {
final LinkedHashMap<Key, Credential> clone = new LinkedHashMap<>(map);
final Key key = Key.of(credential);
// do this as two steps so it's added to the end
clone.remove(key);
clone.put(key, credential);
return new Many(clone);
}
public IdentityCredentials with(final IdentityCredentials other) {
final LinkedHashMap<Key, Credential> clone = new LinkedHashMap<>(map);
for (Credential credential : other) {
final Key key = Key.of(credential);
clone.remove(key);
clone.put(key, credential);
}
return new Many(clone);
}
public CredentialSource with(final CredentialSource other) {
return other instanceof IdentityCredentials ? with((IdentityCredentials) other) : super.with(other);
}
public Iterator<Credential> iterator() {
return Collections.unmodifiableCollection(map.values()).iterator();
}
public <C extends Credential, R> R applyToCredential(final Class<C> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec, final Function<C, R> function) {
final Key key = new Key(credentialType, algorithmName, parameterSpec);
final Credential credential = map.get(key);
if (credential != null) {
return function.apply(credentialType.cast(credential));
}
return null;
}
public IdentityCredentials without(final Predicate<? super Credential> predicate) {
final LinkedHashMap<Key, Credential> clone = new LinkedHashMap<>(map);
final Collection<Credential> values = clone.values();
values.removeIf(predicate);
final Iterator<Credential> iterator = values.iterator();
if (iterator.hasNext()) {
final Credential c1 = iterator.next();
if (iterator.hasNext()) {
final Credential c2 = iterator.next();
if (iterator.hasNext()) {
return new Many(clone);
} else {
return new Two(c1, c2);
}
} else {
return new One(c1);
}
} else {
return NONE;
}
}
public int hashCode() {
return hashCode;
}
public boolean equals(final Object obj) {
if (! (obj instanceof Many)) {
return false;
}
Many many = (Many) obj;
// check is potentially expensive so start here
if (hashCode != many.hashCode) {
return false;
}
if (map.size() != many.map.size()) {
return false;
}
// now the O(n) part
for (Map.Entry<Key, Credential> entry : map.entrySet()) {
if (! Objects.equals(many.map.get(entry.getKey()), entry.getValue())) {
return false;
}
}
return true;
}
}
static final class Key {
private final Class<? extends Credential> clazz;
private final String algorithm;
private final AlgorithmParameterSpec parameterSpec;
private final int hashCode;
Key(final Class<? extends Credential> clazz, final String algorithm, final AlgorithmParameterSpec parameterSpec) {
this.clazz = clazz;
this.algorithm = algorithm;
this.parameterSpec = parameterSpec;
hashCode = multiHashOrdered(multiHashOrdered(clazz.hashCode(), 42979, Objects.hashCode(algorithm)), 62861, Objects.hashCode(parameterSpec));
}
static Key of(Credential c) {
if (c instanceof AlgorithmCredential) {
final AlgorithmCredential ac = (AlgorithmCredential) c;
return new Key(ac.getClass(), ac.getAlgorithm(), ac.getParameters());
} else {
return new Key(c.getClass(), null, null);
}
}
public int hashCode() {
return hashCode;
}
public boolean equals(final Object obj) {
return obj instanceof Key && equals((Key) obj);
}
private boolean equals(final Key key) {
return clazz == key.clazz && Objects.equals(algorithm, key.algorithm) && Objects.equals(parameterSpec, key.parameterSpec);
}
Class<? extends Credential> getClazz() {
return clazz;
}
String getAlgorithm() {
return algorithm;
}
AlgorithmParameterSpec getParameterSpec() {
return parameterSpec;
}
}
}