processing/core/src/processing/data/StringDict.java at master · classicist/processing · GitHub

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package processing.data;

import java.io.*;

import java.util.HashMap;

import java.util.Iterator;

import java.util.NoSuchElementException;

import processing.core.PApplet;

/**

* A simple table class to use a String as a lookup for another String value.

* @webref data:composite

* @see IntDict

* @see FloatDict

public class StringDict {

/** Number of elements in the table */

protected int count;

protected String[] keys;

protected String[] values;

/** Internal implementation for faster lookups */

private HashMap<String, Integer> indices = new HashMap<>();

public StringDict() {

count = 0;

keys = new String[10];

values = new String[10];

}

/**

* Create a new lookup pre-allocated to a specific length. This will not

* change the size(), but is more efficient than not specifying a length.

* Use it when you know the rough size of the thing you're creating.

* @nowebref

public StringDict(int length) {

count = 0;

keys = new String[length];

values = new String[length];

}

/**

* Read a set of entries from a Reader that has each key/value pair on

* a single line, separated by a tab.

* @nowebref

public StringDict(BufferedReader reader) {

String[] lines = PApplet.loadStrings(reader);

keys = new String[lines.length];

values = new String[lines.length];

for (int i = 0; i < lines.length; i++) {

String[] pieces = PApplet.split(lines[i], '\t');

if (pieces.length == 2) {

keys[count] = pieces[0];

values[count] = pieces[1];

indices.put(keys[count], count);

count++;

}

/**

* @nowebref

public StringDict(String[] keys, String[] values) {

if (keys.length != values.length) {

throw new IllegalArgumentException("key and value arrays must be the same length");

}

this.keys = keys;

this.values = values;

count = keys.length;

for (int i = 0; i < count; i++) {

indices.put(keys[i], i);

}

/**

* Constructor to allow (more intuitive) inline initialization, e.g.:

* <pre>

* new StringDict(new String[][] {

* { "key1", "value1" },

* { "key2", "value2" }

* });

* </pre>

* It's no Python, but beats a static { } block with HashMap.put() statements.

public StringDict(String[][] pairs) {

count = pairs.length;

this.keys = new String[count];

this.values = new String[count];

for (int i = 0; i < count; i++) {

keys[i] = pairs[i][0];

values[i] = pairs[i][1];

indices.put(keys[i], i);

}

/**

* Create a dictionary that maps between column titles and cell entries

* in a TableRow. If two columns have the same name, the later column's

* values will override the earlier values.

public StringDict(TableRow row) {

this(row.getColumnCount());

String[] titles = row.getColumnTitles();

if (titles == null) {

titles = new StringList(IntList.fromRange(row.getColumnCount())).array();

}

for (int col = 0; col < row.getColumnCount(); col++) {

set(titles[col], row.getString(col));

}

// remove unused and overwritten entries

crop();

}

/**

* @webref stringdict:method

* @brief Returns the number of key/value pairs

public int size() {

return count;

}

/**

* Resize the internal data, this can only be used to shrink the list.

* Helpful for situations like sorting and then grabbing the top 50 entries.

public void resize(int length) {

if (length > count) {

throw new IllegalArgumentException("resize() can only be used to shrink the dictionary");

}

if (length < 1) {

throw new IllegalArgumentException("resize(" + length + ") is too small, use 1 or higher");

}

String[] newKeys = new String[length];

String[] newValues = new String[length];

PApplet.arrayCopy(keys, newKeys, length);

PApplet.arrayCopy(values, newValues, length);

keys = newKeys;

values = newValues;

count = length;

resetIndices();

}

/**

* Remove all entries.

* @webref stringdict:method

* @brief Remove all entries

public void clear() {

count = 0;

indices = new HashMap<>();

}

private void resetIndices() {

indices = new HashMap<>(count);

for (int i = 0; i < count; i++) {

indices.put(keys[i], i);

}

// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

public class Entry {

public String key;

public String value;

Entry(String key, String value) {

this.key = key;

this.value = value;

}

public Iterable<Entry> entries() {

return new Iterable<Entry>() {

public Iterator<Entry> iterator() {

return entryIterator();

}

};

}

public Iterator<Entry> entryIterator() {

return new Iterator<Entry>() {

int index = -1;

public void remove() {

removeIndex(index);

index--;

}

public Entry next() {

++index;

Entry e = new Entry(keys[index], values[index]);

return e;

}

public boolean hasNext() {

return index+1 < size();

}

};

}

// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

public String key(int index) {

return keys[index];

}

protected void crop() {

if (count != keys.length) {

keys = PApplet.subset(keys, 0, count);

values = PApplet.subset(values, 0, count);

}

public Iterable<String> keys() {

return new Iterable<String>() {

@Override

public Iterator<String> iterator() {

return keyIterator();

}

};

}

// Use this to iterate when you want to be able to remove elements along the way

public Iterator<String> keyIterator() {

return new Iterator<String>() {

int index = -1;

public void remove() {

removeIndex(index);

index--;

}

public String next() {

return key(++index);

}

public boolean hasNext() {

return index+1 < size();

}

};

}

/**

* Return a copy of the internal keys array. This array can be modified.

* @webref stringdict:method

* @brief Return a copy of the internal keys array

public String[] keyArray() {

crop();

return keyArray(null);

}

public String[] keyArray(String[] outgoing) {

if (outgoing == null || outgoing.length != count) {

outgoing = new String[count];

}

System.arraycopy(keys, 0, outgoing, 0, count);

return outgoing;

}

public String value(int index) {

return values[index];

}

/**

* @webref stringdict:method

* @brief Return the internal array being used to store the values

public Iterable<String> values() {

return new Iterable<String>() {

@Override

public Iterator<String> iterator() {

return valueIterator();

}

};

}

public Iterator<String> valueIterator() {

return new Iterator<String>() {

int index = -1;

public void remove() {

removeIndex(index);

index--;

}

public String next() {

return value(++index);

}

public boolean hasNext() {

return index+1 < size();

}

};

}

/**

* Create a new array and copy each of the values into it.

* @webref stringdict:method

* @brief Create a new array and copy each of the values into it

public String[] valueArray() {

crop();

return valueArray(null);

}

/**

* Fill an already-allocated array with the values (more efficient than

* creating a new array each time). If 'array' is null, or not the same

* size as the number of values, a new array will be allocated and returned.

public String[] valueArray(String[] array) {

if (array == null || array.length != size()) {

array = new String[count];

}

System.arraycopy(values, 0, array, 0, count);

return array;

}

/**

* Return a value for the specified key.

* @webref stringdict:method

* @brief Return a value for the specified key

public String get(String key) {

int index = index(key);

if (index == -1) return null;

return values[index];

}

public String get(String key, String alternate) {

int index = index(key);

if (index == -1) return alternate;

return values[index];

}

/**

* @webref stringdict:method

* @brief Create a new key/value pair or change the value of one

public void set(String key, String value) {

int index = index(key);

if (index == -1) {

create(key, value);

} else {

values[index] = value;

}

public void setIndex(int index, String key, String value) {

if (index < 0 || index >= count) {

throw new ArrayIndexOutOfBoundsException(index);

}

keys[index] = key;

values[index] = value;

}

public int index(String what) {

Integer found = indices.get(what);

return (found == null) ? -1 : found.intValue();

}

/**

* @webref stringdict:method

* @brief Check if a key is a part of the data structure

public boolean hasKey(String key) {

return index(key) != -1;

}

protected void create(String key, String value) {

if (count == keys.length) {

keys = PApplet.expand(keys);

values = PApplet.expand(values);

}

indices.put(key, Integer.valueOf(count));

keys[count] = key;

values[count] = value;

count++;

}

/**

* @webref stringdict:method

* @brief Remove a key/value pair

public String remove(String key) {

int index = index(key);

if (index == -1) {

throw new NoSuchElementException("'" + key + "' not found");

}

String value = values[index];

removeIndex(index);

return value;

}

public String removeIndex(int index) {

if (index < 0 || index >= count) {

throw new ArrayIndexOutOfBoundsException(index);

}

String value = values[index];

indices.remove(keys[index]);

for (int i = index; i < count-1; i++) {

keys[i] = keys[i+1];

values[i] = values[i+1];

indices.put(keys[i], i);

}

count--;

keys[count] = null;

values[count] = null;

return value;

}

public void swap(int a, int b) {

String tkey = keys[a];

String tvalue = values[a];

keys[a] = keys[b];

values[a] = values[b];

keys[b] = tkey;

values[b] = tvalue;

// indices.put(keys[a], Integer.valueOf(a));

// indices.put(keys[b], Integer.valueOf(b));

}

/**

* Sort the keys alphabetically (ignoring case). Uses the value as a

* tie-breaker (only really possible with a key that has a case change).

* @webref stringdict:method

* @brief Sort the keys alphabetically

public void sortKeys() {

sortImpl(true, false);

}

/**

* @webref stringdict:method

* @brief Sort the keys alphabetically in reverse

public void sortKeysReverse() {

sortImpl(true, true);

}

/**

* Sort by values in descending order (largest value will be at [0]).

* @webref stringdict:method

* @brief Sort by values in ascending order

public void sortValues() {

sortImpl(false, false);

}

/**

* @webref stringdict:method

* @brief Sort by values in descending order

public void sortValuesReverse() {

sortImpl(false, true);

}

protected void sortImpl(final boolean useKeys, final boolean reverse) {

Sort s = new Sort() {

@Override

public int size() {

return count;

}

@Override

public int compare(int a, int b) {

int diff = 0;

if (useKeys) {

diff = keys[a].compareToIgnoreCase(keys[b]);

if (diff == 0) {

diff = values[a].compareToIgnoreCase(values[b]);

}

} else { // sort values

diff = values[a].compareToIgnoreCase(values[b]);

if (diff == 0) {

diff = keys[a].compareToIgnoreCase(keys[b]);

}

return reverse ? -diff : diff;

}

@Override

public void swap(int a, int b) {

StringDict.this.swap(a, b);

}

};

s.run();

// Set the indices after sort/swaps (performance fix 160411)

resetIndices();

}

/** Returns a duplicate copy of this object. */

public StringDict copy() {

StringDict outgoing = new StringDict(count);

System.arraycopy(keys, 0, outgoing.keys, 0, count);

System.arraycopy(values, 0, outgoing.values, 0, count);

for (int i = 0; i < count; i++) {

outgoing.indices.put(keys[i], i);

}

outgoing.count = count;

return outgoing;

}

public void print() {

for (int i = 0; i < size(); i++) {

System.out.println(keys[i] + " = " + values[i]);

}

/**

* Save tab-delimited entries to a file (TSV format, UTF-8 encoding)

public void save(File file) {

PrintWriter writer = PApplet.createWriter(file);

write(writer);

writer.close();

}

/**

* Write tab-delimited entries to a PrintWriter

public void write(PrintWriter writer) {

for (int i = 0; i < count; i++) {

writer.println(keys[i] + "\t" + values[i]);

}

writer.flush();

}

/**

* Return this dictionary as a String in JSON format.

public String toJSON() {

StringList items = new StringList();

for (int i = 0; i < count; i++) {

items.append(JSONObject.quote(keys[i])+ ": " + JSONObject.quote(values[i]));

}

return "{ " + items.join(", ") + " }";

}

@Override

public String toString() {

return getClass().getSimpleName() + " size=" + size() + " " + toJSON();

}

processing/core/src/processing/data/StringDict.java at master · classicist/processing · GitHub

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