jakarta.ws.rs.core.AbstractMultivaluedMap Maven / Gradle / Ivy
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* Copyright (c) 2012, 2019 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.ws.rs.core;
import java.io.Serializable;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Abstract skeleton implementation of a {@link MultivaluedMap} that is backed by a [key, multi-value] store represented
* as a {@link Map Map<K, List<V>>}.
*
* @param the type of keys maintained by this map.
* @param the type of mapped values.
* @author Marek Potociar
*/
public abstract class AbstractMultivaluedMap implements MultivaluedMap, Serializable {
/**
* Backing store for the [key, multi-value] pairs.
*/
protected final Map> store;
/**
* Initialize the backing store in the abstract parent multivalued map implementation.
*
* @param store the backing {@link Map} to be used as a [key, multi-value] store. Must not be {@code null}.
* @throws NullPointerException in case the underlying {@code store} parameter is {@code null}.
*/
public AbstractMultivaluedMap(final Map> store) {
if (store == null) {
throw new NullPointerException("Underlying store must not be 'null'.");
}
this.store = store;
}
/**
*
* Set the value for the key to be a one item list consisting of the supplied value. Any existing values will be
* replaced.
*
* NOTE: This implementation ignores {@code null} values; A supplied value of {@code null} is ignored and not added to
* the purged value list. As a result of such operation, empty value list would be registered for the supplied key.
* Overriding implementations may modify this behavior by redefining the {@link #addNull(java.util.List)} method.
*
* @param key the key
* @param value the single value of the key. If the value is {@code null} it will be ignored.
*/
@Override
public final void putSingle(final K key, final V value) {
List values = getValues(key);
values.clear();
if (value != null) {
values.add(value);
} else {
addNull(values);
}
}
/**
*
* Define the behavior for adding a {@code null} values to the value list.
*
* Default implementation is a no-op, i.e. the {@code null} values are ignored. Overriding implementations may modify
* this behavior by providing their own definitions of this method.
*
* @param values value list where the {@code null} value addition is being requested.
*/
@SuppressWarnings("UnusedParameters")
protected void addNull(final List values) {
// do nothing in the default implementation; ignore the null value
}
/**
*
* Define the behavior for adding a {@code null} values to the first position in the value list.
*
* Default implementation is a no-op, i.e. the {@code null} values are ignored. Overriding implementations may modify
* this behavior by providing their own definitions of this method.
*
* @param values value list where the {@code null} value addition is being requested.
*/
@SuppressWarnings("UnusedParameters")
protected void addFirstNull(final List values) {
// do nothing in the default implementation; ignore the null value
}
/**
*
* Add a value to the current list of values for the supplied key.
*
* NOTE: This implementation ignores {@code null} values; A supplied value of {@code null} is ignored and not added to
* the value list. Overriding implementations may modify this behavior by redefining the
* {@link #addNull(java.util.List)} method.
*
* @param key the key
* @param value the value to be added.
*/
@Override
public final void add(final K key, final V value) {
List values = getValues(key);
if (value != null) {
values.add(value);
} else {
addNull(values);
}
}
/**
*
* Add multiple values to the current list of values for the supplied key. If the supplied array of new values is empty,
* method returns immediately. Method throws a {@code NullPointerException} if the supplied array of values is
* {@code null}.
*
* NOTE: This implementation ignores {@code null} values; Any of the supplied values of {@code null} is ignored and not
* added to the value list. Overriding implementations may modify this behavior by redefining the
* {@link #addNull(java.util.List)} method.
*
* @param key the key.
* @param newValues the values to be added.
* @throws NullPointerException if the supplied array of new values is {@code null}.
*/
@Override
public final void addAll(final K key, final V... newValues) {
if (newValues == null) {
throw new NullPointerException("Supplied array of values must not be null.");
}
if (newValues.length == 0) {
return;
}
List values = getValues(key);
for (V value : newValues) {
if (value != null) {
values.add(value);
} else {
addNull(values);
}
}
}
/**
*
* Add all the values from the supplied value list to the current list of values for the supplied key. If the supplied
* value list is empty, method returns immediately. Method throws a {@code NullPointerException} if the supplied array
* of values is {@code null}.
*
* NOTE: This implementation ignores {@code null} values; Any {@code null} value in the supplied value list is ignored
* and not added to the value list. Overriding implementations may modify this behavior by redefining the
* {@link #addNull(java.util.List)} method.
*
* @param key the key.
* @param valueList the list of values to be added.
* @throws NullPointerException if the supplied value list is {@code null}.
*/
@Override
public final void addAll(final K key, final List valueList) {
if (valueList == null) {
throw new NullPointerException("Supplied list of values must not be null.");
}
if (valueList.isEmpty()) {
return;
}
List values = getValues(key);
for (V value : valueList) {
if (value != null) {
values.add(value);
} else {
addNull(values);
}
}
}
@Override
public final V getFirst(final K key) {
List values = store.get(key);
if (values != null && values.size() > 0) {
return values.get(0);
} else {
return null;
}
}
/**
*
* Add a value to the first position in the current list of values for the supplied key.
*
* NOTE: This implementation ignores {@code null} values; A supplied value of {@code null} is ignored and not added to
* the purged value list. Overriding implementations may modify this behavior by redefining the
* {@link #addFirstNull(java.util.List)} method.
*
* @param key the key
* @param value the value to be added.
*/
@Override
public final void addFirst(final K key, final V value) {
List values = getValues(key);
if (value != null) {
values.add(0, value);
} else {
addFirstNull(values);
}
}
/**
*
* Return a non-null list of values for a given key. The returned list may be empty.
*
* If there is no entry for the key in the map, a new empty {@link List} instance is created, registered within the map
* to hold the values of the key and returned from the method.
*
* @param key the key.
* @return value list registered with the key. The method is guaranteed to never return {@code null}.
*/
protected final List getValues(final K key) {
List l = store.get(key);
if (l == null) {
l = new LinkedList();
store.put(key, l);
}
return l;
}
@Override
public String toString() {
return store.toString();
}
/**
* {@inheritDoc }
*
* This implementation delegates the method call to to the the underlying [key, multi-value] store.
*
*
* @return a hash code value for the underlying [key, multi-value] store.
*/
@Override
public int hashCode() {
return store.hashCode();
}
/**
* {@inheritDoc }
*
* This implementation delegates the method call to to the the underlying [key, multi-value] store.
*
*
* @return {@code true} if the specified object is equal to the underlying [key, multi-value] store, {@code false}
* otherwise.
*/
@Override
@SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
public boolean equals(final Object o) {
return store.equals(o);
}
@Override
public Collection> values() {
return store.values();
}
@Override
public int size() {
return store.size();
}
@Override
public List remove(final Object key) {
return store.remove(key);
}
@Override
public void putAll(final Map> m) {
store.putAll(m);
}
@Override
public List put(final K key, final List value) {
return store.put(key, value);
}
@Override
public Set keySet() {
return store.keySet();
}
@Override
public boolean isEmpty() {
return store.isEmpty();
}
@Override
public List get(final Object key) {
return store.get(key);
}
@Override
public Set>> entrySet() {
return store.entrySet();
}
@Override
public boolean containsValue(final Object value) {
return store.containsValue(value);
}
@Override
public boolean containsKey(final Object key) {
return store.containsKey(key);
}
@Override
public void clear() {
store.clear();
}
@Override
public boolean equalsIgnoreValueOrder(final MultivaluedMap omap) {
if (this == omap) {
return true;
}
if (!keySet().equals(omap.keySet())) {
return false;
}
for (Entry> e : entrySet()) {
List olist = omap.get(e.getKey());
if (e.getValue().size() != olist.size()) {
return false;
}
for (V v : e.getValue()) {
if (!olist.contains(v)) {
return false;
}
}
}
return true;
}
}
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