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/*
* Copyright (C) 2007-2017 Sebastiano Vigna
*
* 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 PACKAGE;
import java.util.Map;
import java.util.NoSuchElementException;
import it.unimi.dsi.fastutil.objects.AbstractObjectIterator;
import it.unimi.dsi.fastutil.objects.AbstractObjectSet;
import it.unimi.dsi.fastutil.objects.ObjectIterator;
import VALUE_PACKAGE.VALUE_COLLECTION;
import VALUE_PACKAGE.VALUE_COLLECTIONS;
import VALUE_PACKAGE.VALUE_ARRAY_SET;
import VALUE_PACKAGE.VALUE_ARRAYS;
/** A simple, brute-force implementation of a map based on two parallel backing arrays.
*
* The main purpose of this
* implementation is that of wrapping cleanly the brute-force approach to the storage of a very
* small number of pairs: just put them into two parallel arrays and scan linearly to find an item.
*/
public class ARRAY_MAP KEY_VALUE_GENERIC extends ABSTRACT_MAP KEY_VALUE_GENERIC implements java.io.Serializable, Cloneable {
private static final long serialVersionUID = 1L;
/** The keys (valid up to {@link #size}, excluded). */
private transient KEY_TYPE[] key;
/** The values (parallel to {@link #key}). */
private transient VALUE_TYPE[] value;
/** The number of valid entries in {@link #key} and {@link #value}. */
private int size;
/** Creates a new empty array map with given key and value backing arrays. The resulting map will have as many entries as the given arrays.
*
*
It is responsibility of the caller that the elements of key are distinct.
*
* @param key the key array.
* @param value the value array (it must have the same length as key).
*/
public ARRAY_MAP(final KEY_TYPE[] key, final VALUE_TYPE[] value) {
this.key = key;
this.value = value;
size = key.length;
if(key.length != value.length) throw new IllegalArgumentException("Keys and values have different lengths (" + key.length + ", " + value.length + ")");
}
/** Creates a new empty array map.
*/
public ARRAY_MAP() {
this.key = ARRAYS.EMPTY_ARRAY;
this.value = VALUE_ARRAYS.EMPTY_ARRAY;
}
/** Creates a new empty array map of given capacity.
*
* @param capacity the initial capacity.
*/
public ARRAY_MAP(final int capacity) {
this.key = new KEY_TYPE[capacity];
this.value = new VALUE_TYPE[capacity];
}
/** Creates a new empty array map copying the entries of a given map.
*
* @param m a map.
*/
public ARRAY_MAP(final MAP KEY_VALUE_GENERIC m) {
this(m.size());
putAll(m);
}
/** Creates a new empty array map copying the entries of a given map.
*
* @param m a map.
*/
public ARRAY_MAP(final Map m) {
this(m.size());
putAll(m);
}
/** Creates a new array map with given key and value backing arrays, using the given number of elements.
*
*
It is responsibility of the caller that the first size elements of key are distinct.
*
* @param key the key array.
* @param value the value array (it must have the same length as key).
* @param size the number of valid elements in key and value.
*/
public ARRAY_MAP(final KEY_TYPE[] key, final VALUE_TYPE[] value, final int size) {
this.key = key;
this.value = value;
this.size = size;
if(key.length != value.length) throw new IllegalArgumentException("Keys and values have different lengths (" + key.length + ", " + value.length + ")");
if (size > key.length) throw new IllegalArgumentException("The provided size (" + size + ") is larger than or equal to the backing-arrays size (" + key.length + ")");
}
private final class EntrySet extends AbstractObjectSet implements FastEntrySet KEY_VALUE_GENERIC {
@Override
public ObjectIterator iterator() {
return new AbstractObjectIterator() {
int curr = -1, next = 0;
@Override
public boolean hasNext() {
return next < size;
}
@Override
SUPPRESS_WARNINGS_KEY_VALUE_UNCHECKED
public Entry KEY_VALUE_GENERIC next() {
if (! hasNext()) throw new NoSuchElementException();
return new ABSTRACT_MAP.BasicEntry KEY_VALUE_GENERIC(KEY_GENERIC_CAST key[curr = next], VALUE_GENERIC_CAST value[next++]);
}
@Override
public void remove() {
if (curr == -1) throw new IllegalStateException();
curr = -1;
final int tail = size-- - next--;
System.arraycopy(key, next + 1, key, next, tail);
System.arraycopy(value, next + 1, value, next, tail);
#if KEYS_REFERENCE
key[size] = null;
#endif
#if VALUES_REFERENCE
value[size] = null;
#endif
}
};
}
@Override
public ObjectIterator fastIterator() {
return new AbstractObjectIterator() {
int next = 0, curr = -1;
final BasicEntry KEY_VALUE_GENERIC entry = new BasicEntry KEY_VALUE_GENERIC (KEY_NULL, VALUE_NULL);
@Override
public boolean hasNext() {
return next < size;
}
@Override
SUPPRESS_WARNINGS_KEY_VALUE_UNCHECKED
public Entry KEY_VALUE_GENERIC next() {
if (! hasNext()) throw new NoSuchElementException();
entry.key = KEY_GENERIC_CAST key[curr = next];
entry.value = VALUE_GENERIC_CAST value[next++];
return entry;
}
@Override
public void remove() {
if (curr == -1) throw new IllegalStateException();
curr = -1;
final int tail = size-- - next--;
System.arraycopy(key, next + 1, key, next, tail);
System.arraycopy(value, next + 1, value, next, tail);
#if KEYS_REFERENCE
key[size] = null;
#endif
#if VALUES_REFERENCE
value[size] = null;
#endif
}
};
}
@Override
public int size() {
return size;
}
@Override
SUPPRESS_WARNINGS_KEY_UNCHECKED
public boolean contains(Object o) {
if (! (o instanceof Map.Entry)) return false;
final Map.Entry e = (Map.Entry)o;
#if KEYS_PRIMITIVE
if (e.getKey() == null || ! (e.getKey() instanceof KEY_CLASS)) return false;
#endif
#if VALUES_PRIMITIVE
if (e.getValue() == null || ! (e.getValue() instanceof VALUE_CLASS)) return false;
#endif
final KEY_GENERIC_TYPE k = KEY_OBJ2TYPE(KEY_GENERIC_CAST e.getKey());
return ARRAY_MAP.this.containsKey(k) && VALUE_EQUALS(ARRAY_MAP.this.GET_VALUE(k), VALUE_OBJ2TYPE(e.getValue()));
}
@Override
SUPPRESS_WARNINGS_KEY_VALUE_UNCHECKED
public boolean remove(final Object o) {
if (!(o instanceof Map.Entry)) return false;
final Map.Entry e = (Map.Entry)o;
#if KEYS_PRIMITIVE
if (e.getKey() == null || ! (e.getKey() instanceof KEY_CLASS)) return false;
#endif
#if VALUES_PRIMITIVE
if (e.getValue() == null || ! (e.getValue() instanceof VALUE_CLASS)) return false;
#endif
final KEY_GENERIC_TYPE k = KEY_OBJ2TYPE(KEY_GENERIC_CAST e.getKey());
final VALUE_GENERIC_TYPE v = VALUE_OBJ2TYPE(VALUE_GENERIC_CAST e.getValue());
final int oldPos = ARRAY_MAP.this.findKey(k);
if (oldPos == -1 || ! VALUE_EQUALS(v, ARRAY_MAP.this.value[oldPos])) return false;
final int tail = size - oldPos - 1;
System.arraycopy(ARRAY_MAP.this.key, oldPos + 1, ARRAY_MAP.this.key, oldPos, tail);
System.arraycopy(ARRAY_MAP.this.value, oldPos + 1, ARRAY_MAP.this.value, oldPos, tail);
ARRAY_MAP.this.size--;
#if KEYS_REFERENCE
ARRAY_MAP.this.key[size] = null;
#endif
#if VALUES_REFERENCE
ARRAY_MAP.this.value[size] = null;
#endif
return true;
}
}
@Override
public FastEntrySet KEY_VALUE_GENERIC ENTRYSET() {
return new EntrySet();
}
private int findKey(final KEY_TYPE k) {
final KEY_TYPE[] key = this.key;
for(int i = size; i-- != 0;) if (KEY_EQUALS(key[i], k)) return i;
return -1;
}
@Override
SUPPRESS_WARNINGS_VALUE_UNCHECKED
public VALUE_GENERIC_TYPE GET_VALUE(final KEY_TYPE k) {
final KEY_TYPE[] key = this.key;
for(int i = size; i-- != 0;) if (KEY_EQUALS(key[i], k)) return VALUE_GENERIC_CAST value[i];
return defRetValue;
}
@Override
public int size() {
return size;
}
@Override
public void clear() {
#if KEYS_REFERENCE || VALUES_REFERENCE
for(int i = size; i-- != 0;) {
#if KEYS_REFERENCE
key[i] = null;
#endif
#if VALUES_REFERENCE
value[i] = null;
#endif
}
#endif
size = 0;
}
@Override
public boolean containsKey(final KEY_TYPE k) {
return findKey(k) != -1;
}
@Override
public boolean containsValue(VALUE_TYPE v) {
for(int i = size; i-- != 0;) if (VALUE_EQUALS(value[i], v)) return true;
return false;
}
@Override
public boolean isEmpty() {
return size == 0;
}
@Override
SUPPRESS_WARNINGS_VALUE_UNCHECKED
public VALUE_GENERIC_TYPE put(KEY_GENERIC_TYPE k, VALUE_GENERIC_TYPE v) {
final int oldKey = findKey(k);
if (oldKey != -1) {
final VALUE_GENERIC_TYPE oldValue = VALUE_GENERIC_CAST value[oldKey];
value[oldKey] = v;
return oldValue;
}
if (size == key.length) {
final KEY_TYPE[] newKey = new KEY_TYPE[size == 0 ? 2 : size * 2];
final VALUE_TYPE[] newValue = new VALUE_TYPE[size == 0 ? 2 : size * 2];
for(int i = size; i-- != 0;) {
newKey[i] = key[i];
newValue[i] = value[i];
}
key = newKey;
value = newValue;
}
key[size] = k;
value[size] = v;
size++;
return defRetValue;
}
@Override
SUPPRESS_WARNINGS_VALUE_UNCHECKED
public VALUE_GENERIC_TYPE REMOVE_VALUE(final KEY_TYPE k) {
final int oldPos = findKey(k);
if (oldPos == -1) return defRetValue;
final VALUE_GENERIC_TYPE oldValue = VALUE_GENERIC_CAST value[oldPos];
final int tail = size - oldPos - 1;
System.arraycopy(key, oldPos + 1, key, oldPos, tail);
System.arraycopy(value, oldPos + 1, value, oldPos, tail);
size--;
#if KEYS_REFERENCE
key[size] = null;
#endif
#if VALUES_REFERENCE
value[size] = null;
#endif
return oldValue;
}
@Override
public SET KEY_GENERIC keySet() {
return new ARRAY_SET KEY_GENERIC(key, size);
}
@Override
public VALUE_COLLECTION VALUE_GENERIC values() {
return VALUE_COLLECTIONS.unmodifiable(new VALUE_ARRAY_SET VALUE_GENERIC(value, size));
}
/** Returns a deep copy of this map.
*
* This method performs a deep copy of this hash map; the data stored in the
* map, however, is not cloned. Note that this makes a difference only for object keys.
*
* @return a deep copy of this map.
*/
@Override
SUPPRESS_WARNINGS_KEY_VALUE_UNCHECKED
public ARRAY_MAP KEY_VALUE_GENERIC clone() {
ARRAY_MAP KEY_VALUE_GENERIC c;
try {
c = (ARRAY_MAP KEY_VALUE_GENERIC)super.clone();
}
catch(CloneNotSupportedException cantHappen) {
throw new InternalError();
}
c.key = key.clone();
c.value = value.clone();
return c;
}
private void writeObject(java.io.ObjectOutputStream s) throws java.io.IOException {
s.defaultWriteObject();
for(int i = 0; i < size; i++) {
s.WRITE_KEY(key[i]);
s.WRITE_VALUE(value[i]);
}
}
private void readObject(java.io.ObjectInputStream s) throws java.io.IOException, ClassNotFoundException {
s.defaultReadObject();
key = new KEY_TYPE[size];
value = new VALUE_TYPE[size];
for(int i = 0; i < size; i++) {
key[i] = s.READ_KEY();
value[i] = s.READ_VALUE();
}
}
}