processing/core/src/processing/data/StringList.java at master · appsou/processing · GitHub

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package processing.data;

import java.util.Arrays;

import java.util.Iterator;

import java.util.Random;

import processing.core.PApplet;

/**

* Helper class for a list of Strings. Lists are designed to have some of the

* features of ArrayLists, but to maintain the simplicity and efficiency of

* working with arrays.

* Functions like sort() and shuffle() always act on the list itself. To get

* a sorted copy, use list.copy().sort().

* @webref data:composite

* @see IntList

* @see FloatList

public class StringList implements Iterable<String> {

int count;

String[] data;

public StringList() {

this(10);

}

/**

* @nowebref

public StringList(int length) {

data = new String[length];

}

/**

* @nowebref

public StringList(String[] list) {

count = list.length;

data = new String[count];

System.arraycopy(list, 0, data, 0, count);

}

/**

* Construct a StringList from a random pile of objects. Null values will

* stay null, but all the others will be converted to String values.

public StringList(Object... items) {

count = items.length;

data = new String[count];

int index = 0;

for (Object o : items) {

// // Not gonna go with null values staying that way because perhaps

// // the most common case here is to immediately call join() or similar.

// data[index++] = String.valueOf(o);

// Keep null values null (because join() will make non-null anyway)

if (o != null) { // leave null values null

data[index] = o.toString();

}

index++;

}

/**

* Create from something iterable, for instance:

* StringList list = new StringList(hashMap.keySet());

* @nowebref

public StringList(Iterable<String> iter) {

this(10);

for (String s : iter) {

append(s);

}

/**

* Improve efficiency by removing allocated but unused entries from the

* internal array used to store the data. Set to private, though it could

* be useful to have this public if lists are frequently making drastic

* size changes (from very large to very small).

private void crop() {

if (count != data.length) {

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

}

/**

* Get the length of the list.

* @webref stringlist:method

* @brief Get the length of the list

public int size() {

return count;

}

public void resize(int length) {

if (length > data.length) {

String[] temp = new String[length];

System.arraycopy(data, 0, temp, 0, count);

data = temp;

} else if (length > count) {

Arrays.fill(data, count, length, 0);

}

count = length;

}

/**

* Remove all entries from the list.

* @webref stringlist:method

* @brief Remove all entries from the list

public void clear() {

count = 0;

}

/**

* Get an entry at a particular index.

* @webref stringlist:method

* @brief Get an entry at a particular index

public String get(int index) {

if (index >= count) {

throw new ArrayIndexOutOfBoundsException(index);

}

return data[index];

}

/**

* Set the entry at a particular index. If the index is past the length of

* the list, it'll expand the list to accommodate, and fill the intermediate

* entries with 0s.

* @webref stringlist:method

* @brief Set an entry at a particular index

public void set(int index, String what) {

if (index >= count) {

data = PApplet.expand(data, index+1);

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

data[i] = null;

}

count = index+1;

}

data[index] = what;

}

/** Just an alias for append(), but matches pop() */

public void push(String value) {

append(value);

}

public String pop() {

if (count == 0) {

throw new RuntimeException("Can't call pop() on an empty list");

}

String value = get(count-1);

data[--count] = null; // avoid leak

return value;

}

/**

* Remove an element from the specified index.

* @webref stringlist:method

* @brief Remove an element from the specified index

public String remove(int index) {

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

throw new ArrayIndexOutOfBoundsException(index);

}

String entry = data[index];

// int[] outgoing = new int[count - 1];

// System.arraycopy(data, 0, outgoing, 0, index);

// count--;

// System.arraycopy(data, index + 1, outgoing, 0, count - index);

// data = outgoing;

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

data[i] = data[i+1];

}

count--;

return entry;

}

// Remove the first instance of a particular value and return its index.

public int removeValue(String value) {

if (value == null) {

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

if (data[i] == null) {

remove(i);

return i;

}

} else {

int index = index(value);

if (index != -1) {

remove(index);

return index;

}

return -1;

}

// Remove all instances of a particular value and return the count removed.

public int removeValues(String value) {

int ii = 0;

if (value == null) {

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

if (data[i] != null) {

data[ii++] = data[i];

}

} else {

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

if (!value.equals(data[i])) {

data[ii++] = data[i];

}

int removed = count - ii;

count = ii;

return removed;

}

// replace the first value that matches, return the index that was replaced

public int replaceValue(String value, String newValue) {

if (value == null) {

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

if (data[i] == null) {

data[i] = newValue;

return i;

}

} else {

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

if (value.equals(data[i])) {

data[i] = newValue;

return i;

}

return -1;

}

// replace all values that match, return the count of those replaced

public int replaceValues(String value, String newValue) {

int changed = 0;

if (value == null) {

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

if (data[i] == null) {

data[i] = newValue;

changed++;

}

} else {

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

if (value.equals(data[i])) {

data[i] = newValue;

changed++;

}

return changed;

}

/**

* Add a new entry to the list.

* @webref stringlist:method

* @brief Add a new entry to the list

public void append(String value) {

if (count == data.length) {

data = PApplet.expand(data);

}

data[count++] = value;

}

public void append(String[] values) {

for (String v : values) {

append(v);

}

public void append(StringList list) {

for (String v : list.values()) { // will concat the list...

append(v);

}

/** Add this value, but only if it's not already in the list. */

public void appendUnique(String value) {

if (!hasValue(value)) {

append(value);

}

// public void insert(int index, int value) {

// if (index+1 > count) {

// if (index+1 < data.length) {

// }

// if (index >= data.length) {

// data = PApplet.expand(data, index+1);

// data[index] = value;

// count = index+1;

// } else if (count == data.length) {

// if (index >= count) {

// //int[] temp = new int[count << 1];

// System.arraycopy(data, 0, temp, 0, index);

// temp[index] = value;

// System.arraycopy(data, index, temp, index+1, count - index);

// data = temp;

// } else {

// // data[] has room to grow

// // for() loop believed to be faster than System.arraycopy over itself

// for (int i = count; i > index; --i) {

// data[i] = data[i-1];

// }

// data[index] = value;

// count++;

// }

public void insert(int index, String value) {

insert(index, new String[] { value });

}

// same as splice

public void insert(int index, String[] values) {

if (index < 0) {

throw new IllegalArgumentException("insert() index cannot be negative: it was " + index);

}

if (index >= data.length) {

throw new IllegalArgumentException("insert() index " + index + " is past the end of this list");

}

String[] temp = new String[count + values.length];

// Copy the old values, but not more than already exist

System.arraycopy(data, 0, temp, 0, Math.min(count, index));

// Copy the new values into the proper place

System.arraycopy(values, 0, temp, index, values.length);

// if (index < count) {

// The index was inside count, so it's a true splice/insert

System.arraycopy(data, index, temp, index+values.length, count - index);

count = count + values.length;

// } else {

// // The index was past 'count', so the new count is weirder

// count = index + values.length;

// }

data = temp;

}

public void insert(int index, StringList list) {

insert(index, list.values());

}

// below are aborted attempts at more optimized versions of the code

// that are harder to read and debug...

// if (index + values.length >= count) {

// // We're past the current 'count', check to see if we're still allocated

// // index 9, data.length = 10, values.length = 1

// if (index + values.length < data.length) {

// // There's still room for these entries, even though it's past 'count'.

// // First clear out the entries leading up to it, however.

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

// data[i] = 0;

// }

// data[index] =

// }

// if (index >= data.length) {

// int length = index + values.length;

// int[] temp = new int[length];

// System.arraycopy(data, 0, temp, 0, count);

// System.arraycopy(values, 0, temp, index, values.length);

// data = temp;

// count = data.length;

// } else {

// }

// } else if (count == data.length) {

// int[] temp = new int[count << 1];

// System.arraycopy(data, 0, temp, 0, index);

// temp[index] = value;

// System.arraycopy(data, index, temp, index+1, count - index);

// data = temp;

// } else {

// // data[] has room to grow

// // for() loop believed to be faster than System.arraycopy over itself

// for (int i = count; i > index; --i) {

// data[i] = data[i-1];

// }

// data[index] = value;

// count++;

// }

/** Return the first index of a particular value. */

public int index(String what) {

if (what == null) {

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

if (data[i] == null) {

return i;

}

} else {

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

if (what.equals(data[i])) {

return i;

}

return -1;

}

// !!! TODO this is not yet correct, because it's not being reset when

// the rest of the entries are changed

// protected void cacheIndices() {

// indexCache = new HashMap<Integer, Integer>();

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

// indexCache.put(data[i], i);

// }

/**

* @webref stringlist:method

* @brief Check if a value is a part of the list

public boolean hasValue(String value) {

if (value == null) {

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

if (data[i] == null) {

return true;

}

} else {

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

if (value.equals(data[i])) {

return true;

}

return false;

}

/**

* Sorts the array in place.

* @webref stringlist:method

* @brief Sorts the array in place

public void sort() {

sortImpl(false);

}

/**

* Reverse sort, orders values from highest to lowest.

* @webref stringlist:method

* @brief Reverse sort, orders values from highest to lowest

public void sortReverse() {

sortImpl(true);

}

private void sortImpl(final boolean reverse) {

new Sort() {

@Override

public int size() {

return count;

}

@Override

public float compare(int a, int b) {

float diff = data[a].compareToIgnoreCase(data[b]);

return reverse ? -diff : diff;

}

@Override

public void swap(int a, int b) {

String temp = data[a];

data[a] = data[b];

data[b] = temp;

}

}.run();

}

// use insert()

// public void splice(int index, int value) {

// }

// public void subset(int start) {

// subset(start, count - start);

// }

// public void subset(int start, int num) {

// for (int i = 0; i < num; i++) {

// data[i] = data[i+start];

// }

// count = num;

// }

/**

* @webref stringlist:method

* @brief Reverse the order of the list elements

public void reverse() {

int ii = count - 1;

for (int i = 0; i < count/2; i++) {

String t = data[i];

data[i] = data[ii];

data[ii] = t;

--ii;

}

/**

* Randomize the order of the list elements. Note that this does not

* obey the randomSeed() function in PApplet.

* @webref stringlist:method

* @brief Randomize the order of the list elements

public void shuffle() {

Random r = new Random();

int num = count;

while (num > 1) {

int value = r.nextInt(num);

num--;

String temp = data[num];

data[num] = data[value];

data[value] = temp;

}

/**

* Randomize the list order using the random() function from the specified

* sketch, allowing shuffle() to use its current randomSeed() setting.

public void shuffle(PApplet sketch) {

int num = count;

while (num > 1) {

int value = (int) sketch.random(num);

num--;

String temp = data[num];

data[num] = data[value];

data[value] = temp;

}

/**

* Make the entire list lower case.

* @webref stringlist:method

* @brief Make the entire list lower case

public void lower() {

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

if (data[i] != null) {

data[i] = data[i].toLowerCase();

}

/**

* Make the entire list upper case.

* @webref stringlist:method

* @brief Make the entire list upper case

public void upper() {

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

if (data[i] != null) {

data[i] = data[i].toUpperCase();

}

public StringList copy() {

StringList outgoing = new StringList(data);

outgoing.count = count;

return outgoing;

}

/**

* Returns the actual array being used to store the data. Suitable for

* iterating with a for() loop, but modifying the list could cause terrible

* things to happen.

public String[] values() {

crop();

return data;

}

@Override

public Iterator<String> iterator() {

// return valueIterator();

// }

// public Iterator<String> valueIterator() {

return new Iterator<String>() {

int index = -1;

public void remove() {

StringList.this.remove(index);

index--;

}

public String next() {

return data[++index];

}

public boolean hasNext() {

return index+1 < count;

}

};

}

/**

* Create a new array with a copy of all the values.

* @return an array sized by the length of the list with each of the values.

* @webref stringlist:method

* @brief Create a new array with a copy of all the values

public String[] array() {

return array(null);

}

/**

* Copy values into the specified array. If the specified array is null or

* not the same size, a new array will be allocated.

* @param array

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

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

array = new String[count];

}

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

return array;

}

public StringList getSubset(int start) {

return getSubset(start, count - start);

}

public StringList getSubset(int start, int num) {

String[] subset = new String[num];

System.arraycopy(data, start, subset, 0, num);

return new StringList(subset);

}

/** Get a list of all unique entries. */

public String[] getUnique() {

return getTally().keyArray();

}

/** Count the number of times each String entry is found in this list. */

public IntDict getTally() {

IntDict outgoing = new IntDict();

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

outgoing.increment(data[i]);

}

return outgoing;

}

/** Create a dictionary associating each entry in this list to its index. */

public IntDict getOrder() {

IntDict outgoing = new IntDict();

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

outgoing.set(data[i], i);

}

return outgoing;

}

public String join(String separator) {

if (count == 0) {

return "";

}

StringBuilder sb = new StringBuilder();

sb.append(data[0]);

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

sb.append(separator);

sb.append(data[i]);

}

return sb.toString();

}

public void print() {

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

System.out.format("[%d] %s%n", i, data[i]);

}

/**

* Return this dictionary as a String in JSON format.

public String toJSON() {

StringList temp = new StringList();

for (String item : this) {

temp.append(JSONObject.quote(item));

}

return "[ " + temp.join(", ") + " ]";

}

@Override

public String toString() {

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

}

processing/core/src/processing/data/StringList.java at master · appsou/processing · GitHub

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