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package edu.stanford.nlp.util;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Consumer;
import edu.stanford.nlp.util.logging.PrettyLogger;
import edu.stanford.nlp.util.logging.Redwood;
import edu.stanford.nlp.util.logging.Redwood.RedwoodChannels;
/**
*
* Base implementation of {@link CoreMap} backed by two Java arrays.
*
*
*
* Reasonable care has been put into ensuring that this class is both fast and
* has a light memory footprint.
*
*
*
* Note that like the base classes in the Collections API, this implementation
* is not thread-safe. For speed reasons, these methods are not
* synchronized. A synchronized wrapper could be developed by anyone so
* inclined.
*
*
*
* Equality is defined over the complete set of keys and values currently
* stored in the map. Because this class is mutable, it should not be used
* as a key in a Map.
*
*
* @author dramage
* @author rafferty
*/
public class ArrayCoreMap implements CoreMap /*, Serializable */ {
/**
* A listener for when a key is retrieved by the CoreMap.
* This should only be used for testing.
*/
public static Consumer>> listener; // = null;
/** Initial capacity of the array */
private static final int INITIAL_CAPACITY = 4;
/** Array of keys */
private Class>[] keys;
/** Array of values */
private Object[] values;
/** Total number of elements actually in keys,values */
private int size; // = 0;
/**
* Default constructor - initializes with default initial annotation
* capacity of 4.
*/
public ArrayCoreMap() {
this(INITIAL_CAPACITY);
}
/**
* Initializes this ArrayCoreMap, pre-allocating arrays to hold
* up to capacity key,value pairs. This array will grow if necessary.
*
* @param capacity Initial capacity of object in key,value pairs
*/
public ArrayCoreMap(int capacity) {
keys = ErasureUtils.uncheckedCast(new Class[capacity]);
values = new Object[capacity];
// size starts at 0
}
/**
* Copy constructor.
* @param other The ArrayCoreMap to copy. It may not be null.
*/
public ArrayCoreMap(ArrayCoreMap other) {
size = other.size;
keys = Arrays.copyOf(other.keys, size);
values = Arrays.copyOf(other.values, size);
}
/**
* Copy constructor.
* @param other The ArrayCoreMap to copy. It may not be null.
*/
@SuppressWarnings("unchecked")
public ArrayCoreMap(CoreMap other) {
Set> otherKeys = other.keySet();
size = otherKeys.size();
keys = new Class[size];
values = new Object[size];
int i = 0;
for (Class key : otherKeys) {
this.keys[i] = key;
this.values[i] = other.get(key);
i++;
}
}
/**
* {@inheritDoc}
*/
@Override
@SuppressWarnings("unchecked")
public VALUE get(Class> key) {
for (int i = 0; i < size; i++) {
if (key == keys[i]) {
if (listener != null) {
listener.accept(key); // For tracking which entities were returned by the CoreMap
}
return (VALUE)values[i];
}
}
return null;
}
/**
* {@inheritDoc}
*/
@Override
@SuppressWarnings("unchecked")
public VALUE set(Class> key, VALUE value) {
// search array for existing value to replace
for (int i = 0; i < size; i++) {
if (keys[i] == key) {
VALUE rv = (VALUE)values[i];
values[i] = value;
return rv;
}
}
// not found in arrays, add to end ...
// increment capacity of arrays if necessary
if (size >= keys.length) {
int capacity = keys.length + (keys.length < 16 ? 4: 8);
Class[] newKeys = new Class[capacity];
Object[] newValues = new Object[capacity];
System.arraycopy(keys, 0, newKeys, 0, size);
System.arraycopy(values, 0, newValues, 0, size);
keys = newKeys;
values = newValues;
}
// store value
keys[size] = key;
values[size] = value;
size++;
return null;
}
/**
* {@inheritDoc}
*/
@Override
public Set> keySet() {
return new AbstractSet>() {
@Override
public Iterator> iterator() {
return new Iterator>() {
private int i; // = 0;
@Override
public boolean hasNext() {
return i < size;
}
@Override
public Class next() {
try {
return keys[i++];
} catch (ArrayIndexOutOfBoundsException aioobe) {
throw new NoSuchElementException("ArrayCoreMap keySet iterator exhausted");
}
}
@Override
@SuppressWarnings("unchecked")
public void remove() {
ArrayCoreMap.this.remove((Class)keys[i]);
}
};
}
@Override
public int size() {
return size;
}
};
}
/**
* Return a set of keys such that the value of that key is not null.
*
* @return A hash set such that each element of the set is a key in this CoreMap that has a
* non-null value.
*/
public Set> keySetNotNull() {
Set> mapKeys = new IdentityHashSet<>();
for (int i = 0; i < size(); ++i) {
if (values[i] != null) {
mapKeys.add(this.keys[i]);
}
}
return mapKeys;
}
/**
* {@inheritDoc}
*/
@Override
@SuppressWarnings("unchecked")
public VALUE remove(Class> key) {
Object rv = null;
for (int i = 0; i < size; i++) {
if (keys[i] == key) {
rv = values[i];
if (i < size - 1) {
System.arraycopy(keys, i+1, keys, i, size-(i+1));
System.arraycopy(values, i+1, values, i, size-(i+1));
}
size--;
break;
}
}
return (VALUE)rv;
}
/**
* {@inheritDoc}
*/
@Override
public boolean containsKey(Class> key) {
for (int i = 0; i < size; i++) {
if (keys[i] == key) {
return true;
}
}
return false;
}
/**
* Reduces memory consumption to the minimum for representing the values
* currently stored stored in this object.
*/
public void compact() {
if (keys.length > size) {
Class[] newKeys = new Class[size];
Object[] newValues = new Object[size];
System.arraycopy(keys, 0, newKeys, 0, size);
System.arraycopy(values, 0, newValues, 0, size);
keys = ErasureUtils.uncheckedCast(newKeys);
values = newValues;
}
}
public void setCapacity(int newSize) {
if (size > newSize) { throw new RuntimeException("You cannot set capacity to smaller than the current size."); }
Class[] newKeys = new Class[newSize];
Object[] newValues = new Object[newSize];
System.arraycopy(keys, 0, newKeys, 0, size);
System.arraycopy(values, 0, newValues, 0, size);
keys = ErasureUtils.uncheckedCast(newKeys);
values = newValues;
}
/**
* Returns the number of elements in this map.
* @return The number of elements in this map.
*/
@Override
public int size() {
return size;
}
/**
* Keeps track of which ArrayCoreMaps have had toString called on
* them. We do not want to loop forever when there are cycles in
* the annotation graph. This is kept on a per-thread basis so that
* each thread where toString gets called can keep track of its own
* state. When a call to toString is about to return, this is reset
* to null for that particular thread.
*/
private static final ThreadLocal> toStringCalled =
new ThreadLocal>() {
@Override protected IdentityHashSet initialValue() {
return new IdentityHashSet<>();
}
};
/** Prints a full dump of a CoreMap. This method is robust to
* circularity in the CoreMap.
*
* @return A String representation of the CoreMap
*/
@Override
public String toString() {
IdentityHashSet calledSet = toStringCalled.get();
boolean createdCalledSet = calledSet.isEmpty();
if (calledSet.contains(this)) {
return "[...]";
}
calledSet.add(this);
StringBuilder s = new StringBuilder("[");
for (int i = 0; i < size; i++) {
s.append(keys[i].getSimpleName());
s.append('=');
s.append(values[i]);
if (i < size-1) {
s.append(' ');
}
}
s.append(']');
if (createdCalledSet) {
toStringCalled.remove();
} else {
// Remove the object from the already called set so that
// potential later calls in this object graph have something
// more description than [...]
calledSet.remove(this);
}
return s.toString();
}
// support caching of String form of keys for speedier printing
private static final ConcurrentHashMap shortNames =
new ConcurrentHashMap<>(12, 0.75f, 1);
private static final int SHORTER_STRING_CHARSTRING_START_SIZE = 64;
private static final int SHORTER_STRING_MAX_SIZE_BEFORE_HASHING = 5;
/**
* {@inheritDoc}
*/
@Override
public String toShorterString(String... what) {
StringBuilder s = new StringBuilder(SHORTER_STRING_CHARSTRING_START_SIZE);
s.append('[');
Set whatSet = null;
if (size > SHORTER_STRING_MAX_SIZE_BEFORE_HASHING && what.length > SHORTER_STRING_MAX_SIZE_BEFORE_HASHING) {
// if there's a lot of stuff, hash.
whatSet = new HashSet<>(Arrays.asList(what));
}
for (int i = 0; i < size; i++) {
Class klass = keys[i];
String name = shortNames.get(klass);
if (name == null) {
name = klass.getSimpleName();
int annoIdx = name.lastIndexOf("Annotation");
if (annoIdx >= 0) {
name = name.substring(0, annoIdx);
}
shortNames.put(klass, name);
}
boolean include;
if (what.length == 0) {
include = true;
} else if (whatSet != null) {
include = whatSet.contains(name);
} else {
include = false;
for (String item : what) {
if (item.equals(name)) {
include = true;
break;
}
}
}
if (include) {
if (s.length() > 1) {
s.append(' ');
}
s.append(name);
s.append('=');
s.append(values[i]);
}
}
s.append(']');
return s.toString();
}
/** This gives a very short String representation of a CoreMap
* by leaving it to the content to reveal what field is being printed.
*
* @param what An array (varargs) of Strings that say what annotation keys
* to print. These need to be provided in a shortened form where you
* are just giving the part of the class name without package and up to
* "Annotation". That is,
* edu.stanford.nlp.ling.CoreAnnotations.PartOfSpeechAnnotation
* -> PartOfSpeech . As a special case, an empty array means
* to print everything, not nothing.
* @return Brief string where the field values are just separated by a
* character. If the string contains spaces, it is wrapped in "{...}".
*/
public String toShortString(String... what) {
return toShortString('/', what);
}
/** This gives a very short String representation of a CoreMap
* by leaving it to the content to reveal what field is being printed.
*
* @param separator Character placed between fields in output
* @param what An array (varargs) of Strings that say what annotation keys
* to print. These need to be provided in a shortened form where you
* are just giving the part of the class name without package and up to
* "Annotation". That is,
* edu.stanford.nlp.ling.CoreAnnotations.PartOfSpeechAnnotation
* -> PartOfSpeech . As a special case, an empty array means
* to print everything, not nothing.
* @return Brief string where the field values are just separated by a
* character. If the string contains spaces, it is wrapped in "{...}".
*/
public String toShortString(char separator, String... what) {
StringBuilder s = new StringBuilder();
for (int i = 0; i < size; i++) {
boolean include;
if (what.length > 0) {
String name = keys[i].getSimpleName();
int annoIdx = name.lastIndexOf("Annotation");
if (annoIdx >= 0) {
name = name.substring(0, annoIdx);
}
include = false;
for (String item : what) {
if (item.equals(name)) {
include = true;
break;
}
}
} else {
include = true;
}
if (include) {
if (s.length() > 0) {
s.append(separator);
}
s.append(values[i]);
}
}
String answer = s.toString();
if (answer.indexOf(' ') < 0) {
return answer;
} else {
return '{' + answer + '}';
}
}
/**
* Keeps track of which pairs of ArrayCoreMaps have had equals
* called on them. We do not want to loop forever when there are
* cycles in the annotation graph. This is kept on a per-thread
* basis so that each thread where equals gets called can keep
* track of its own state. When a call to toString is about to
* return, this is reset to null for that particular thread.
*/
private static final ThreadLocal> equalsCalled =
new ThreadLocal<>();
/**
* Two CoreMaps are equal iff all keys and values are .equal.
*/
@SuppressWarnings("unchecked")
@Override
public boolean equals(Object obj) {
if (!(obj instanceof CoreMap)) {
return false;
}
if (obj instanceof HashableCoreMap) {
// overridden behavior for HashableCoreMap
return obj.equals(this);
}
if (obj instanceof ArrayCoreMap) {
// specialized equals for ArrayCoreMap
return equals((ArrayCoreMap)obj);
}
// TODO: make the general equality work in the situation of loops
// in the object graph
// general equality
CoreMap other = (CoreMap)obj;
if ( ! this.keySet().equals(other.keySet())) {
return false;
}
for (Class key : this.keySet()) {
if (!other.containsKey(key)) {
return false;
}
Object thisV = this.get(key), otherV = other.get(key);
if (thisV == otherV) {
continue;
}
// the two values must be unequal, so if either is null, the other isn't
if (thisV == null || otherV == null) {
return false;
}
if ( ! thisV.equals(otherV)) {
return false;
}
}
return true;
}
private boolean equals(ArrayCoreMap other) {
TwoDimensionalMap calledMap = equalsCalled.get();
boolean createdCalledMap = (calledMap == null);
if (createdCalledMap) {
calledMap = TwoDimensionalMap.identityHashMap();
equalsCalled.set(calledMap);
}
// Note that for the purposes of recursion, we assume the two maps
// are equals. The two maps will therefore be equal if they
// encounter each other again during the recursion unless there is
// some other key that causes the equality to fail.
// We do not need to later put false, as the entire call to equals
// will unwind with false if any one equality check returns false.
// TODO: since we only ever keep "true", we would rather use a
// TwoDimensionalSet, but no such thing exists
if (calledMap.contains(this, other)) {
return true;
}
boolean result = true;
calledMap.put(this, other, true);
calledMap.put(other, this, true);
if (this.size != other.size) {
result = false;
} else {
for (int i = 0; i < this.size; i++) {
// test if other contains this key,value pair
boolean matched = false;
for (int j = 0; j < other.size; j++) {
if (this.keys[i] == other.keys[j]) {
if ((this.values[i] == null && other.values[j] != null) ||
(this.values[i] != null && other.values[j] == null)) {
matched = false;
break;
}
if ((this.values[i] == null && other.values[j] == null) ||
(this.values[i].equals(other.values[j]))) {
matched = true;
break;
}
}
}
if (!matched) {
result = false;
break;
}
}
}
if (createdCalledMap) {
equalsCalled.set(null);
}
return result;
}
/**
* Keeps track of which ArrayCoreMaps have had hashCode called on
* them. We do not want to loop forever when there are cycles in
* the annotation graph. This is kept on a per-thread basis so that
* each thread where hashCode gets called can keep track of its own
* state. When a call to toString is about to return, this is reset
* to null for that particular thread.
*/
private static final ThreadLocal> hashCodeCalled =
new ThreadLocal<>();
/**
* Returns a composite hashCode over all the keys and values currently
* stored in the map. Because they may change over time, this class
* is not appropriate for use as map keys.
*/
@Override
public int hashCode() {
IdentityHashSet calledSet = hashCodeCalled.get();
boolean createdCalledSet = (calledSet == null);
if (createdCalledSet) {
calledSet = new IdentityHashSet<>();
hashCodeCalled.set(calledSet);
}
if (calledSet.contains(this)) {
return 0;
}
calledSet.add(this);
int keysCode = 0;
int valuesCode = 0;
for (int i = 0; i < size; i++) {
keysCode += (i < keys.length && values[i] != null ? keys[i].hashCode() : 0);
valuesCode += (i < values.length && values[i] != null ? values[i].hashCode() : 0);
}
if (createdCalledSet) {
hashCodeCalled.set(null);
} else {
// Remove the object after processing is complete so that if
// there are multiple instances of this CoreMap in the overall
// object graph, they each have their hash code calculated.
// TODO: can we cache this for later?
calledSet.remove(this);
}
return keysCode * 37 + valuesCode;
}
//
// serialization magic
//
/** Serialization version id */
private static final long serialVersionUID = 1L;
/**
* Overridden serialization method: compacts our map before writing.
*
* @param out Stream to write to
* @throws IOException If IO error
*/
private void writeObject(ObjectOutputStream out) throws IOException {
compact();
out.defaultWriteObject();
}
// TODO: make prettyLog work in the situation of loops
// in the object graph
/**
* {@inheritDoc}
*/
@Override
@SuppressWarnings("unchecked")
public void prettyLog(RedwoodChannels channels, String description) {
Redwood.startTrack(description);
// sort keys by class name
List sortedKeys = new ArrayList<>(this.keySet());
Collections.sort(sortedKeys,
(a, b) -> a.getCanonicalName().compareTo(b.getCanonicalName()));
// log key/value pairs
for (Class key : sortedKeys) {
String keyName = key.getCanonicalName().replace("class ", "");
Object value = this.get(key);
if (PrettyLogger.dispatchable(value)) {
PrettyLogger.log(channels, keyName, value);
} else {
channels.logf("%s = %s", keyName, value);
}
}
Redwood.endTrack(description);
}
}