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A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

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package javax.ws.rs.core;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.ConcurrentModificationException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * A hash table based implementation of {@link MultivaluedMap} interface.
 *
 * This implementation provides all of the optional map operations. This class
 * makes no guarantees as to the order of the map; in particular, it does not
 * guarantee that the order will remain constant over time. The implementation
 * permits {@code null} key. By default the implementation does also permit
 * {@code null} values, but ignores them. This behavior can be customized
 * by overriding the protected {@link #addNull(List) addNull(...)} and
 * {@link #addFirstNull(List) addFirstNull(...)} methods.
 * 

* This implementation provides constant-time performance for the basic * operations (get and put), assuming the hash function * disperses the elements properly among the buckets. Iteration over * collection views requires time proportional to the "capacity" of the * map instance (the number of buckets) plus its size (the number * of key-value mappings). Thus, it's very important not to set the initial * capacity too high (or the load factor too low) if iteration performance is * important. *

* An instance of MultivaluedHashMap has two parameters that affect its * performance: initial capacity and load factor. The capacity * is the number of buckets in the hash table, and the initial capacity is simply * the capacity at the time the hash table is created. The load factor is * a measure of how full the hash table is allowed to get before its capacity is * automatically increased. When the number of entries in the hash table exceeds * the product of the load factor and the current capacity, the hash table is * rehashed (that is, internal data structures are rebuilt) so that the * hash table has approximately twice the number of buckets. *

* As a general rule, the default load factor (.75) offers a good tradeoff * between time and space costs. Higher values decrease the space overhead * but increase the lookup cost (reflected in most of the operations of the * HashMap class, including get and put). The * expected number of entries in the map and its load factor should be taken * into account when setting its initial capacity, so as to minimize the * number of rehash operations. If the initial capacity is greater * than the maximum number of entries divided by the load factor, no * rehash operations will ever occur. *

* If many mappings are to be stored in a MultivaluedHashMap instance, * creating it with a sufficiently large capacity will allow the mappings to * be stored more efficiently than letting it perform automatic rehashing as * needed to grow the table. *

* Note that this implementation is not guaranteed to be synchronized. * If multiple threads access a hash map concurrently, and at least one of * the threads modifies the map structurally, it must be * synchronized externally. (A structural modification is any operation * that adds or deletes one or more mappings; merely changing the value * associated with a key that an instance already contains is not a * structural modification.) This is typically accomplished by * synchronizing on some object that naturally encapsulates the map. *

* The iterators returned by all of this class's "collection view methods" * are fail-fast: if the map is structurally modified at any time after * the iterator is created, in any way except through the iterator's own * remove method, the iterator will throw a {@link ConcurrentModificationException}. * Thus, in the face of concurrent modification, the iterator fails quickly and * cleanly, rather than risking arbitrary, non-deterministic behavior at an * undetermined time in the future. *

* Note that the fail-fast behavior of an iterator cannot be guaranteed * as it is, generally speaking, impossible to make any hard guarantees in the * presence of unsynchronized concurrent modification. Fail-fast iterators * throw ConcurrentModificationException on a best-effort basis. * Therefore, it would be wrong to write a program that depended on this * exception for its correctness: the fail-fast behavior of iterators * should be used only to detect bugs. * * @param the type of keys maintained by this map. * @param the type of mapped values. * @author Paul Sandoz * @author Marek Potociar * @since 2.0 */ public class MultivaluedHashMap extends AbstractMultivaluedMap implements Serializable { private static final long serialVersionUID = -6052320403766368902L; /** * Constructs an empty multivalued hash map with the default initial capacity * ({@code 16}) and the default load factor ({@code 0.75}). */ public MultivaluedHashMap() { super(new HashMap>()); } /** * Constructs an empty multivalued hash map with the specified initial * capacity and the default load factor ({@code 0.75}). * * @param initialCapacity the initial capacity. * @throws IllegalArgumentException if the initial capacity is negative. */ public MultivaluedHashMap(int initialCapacity) { super(new HashMap>(initialCapacity)); } /** * Constructs an empty multivalued hash map with the specified initial * capacity and load factor. * * @param initialCapacity the initial capacity * @param loadFactor the load factor * @throws IllegalArgumentException if the initial capacity is negative * or the load factor is nonpositive */ public MultivaluedHashMap(int initialCapacity, float loadFactor) { super(new HashMap>(initialCapacity, loadFactor)); } /** * Constructs a new multivalued hash map with the same mappings as the * specified {@link MultivaluedMap }. The {@link List} instances holding * the values of each key are created anew instead of being reused. * * @param map the multivalued map whose mappings are to be placed in this * multivalued map. * @throws NullPointerException if the specified map is {@code null} */ public MultivaluedHashMap(MultivaluedMap map) { this(); putAll(map); } /** * This private method is used by the copy constructor to avoid exposing * additional generic parameters through the public API documentation. * * @param any subclass of K * @param any subclass of V * @param map the map */ private void putAll(MultivaluedMap map) { for (Entry> e : map.entrySet()) { store.put(e.getKey(), new ArrayList(e.getValue())); } } /** * Constructs a new multivalued hash map with the same mappings as the * specified single-valued {@link Map }. * * @param map the single-valued map whose mappings are to be placed in this * multivalued map. * @throws NullPointerException if the specified map is {@code null} */ public MultivaluedHashMap(Map map) { this(); for (Entry e : map.entrySet()) { this.putSingle(e.getKey(), e.getValue()); } } }





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