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JSR 354 provides an API for representing, transporting, and performing comprehensive calculations with
Money and Currency.
This module implements JSR 354.
/**
* Copyright (c) 2012, 2014, Credit Suisse (Anatole Tresch), Werner Keil and others by the @author tag.
*
* 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 org.javamoney.moneta.internal.format;
import java.util.Optional;
/**
* Small utility class that supports flexible grouping of an input String using
* different grouping characters and sizes.
*
* @author Anatole Tresch
*/
final class StringGrouper {
private char[] groupCharacters = new char[] { ' ' };
private int[] groupSizes = new int[] { 3 };
private boolean reverse;
StringGrouper() {
}
StringGrouper(char... groupCharacters) {
setGroupChars(groupCharacters);
}
StringGrouper(char groupCharacter, int... groupSizes) {
setGroupChars(groupCharacter);
setGroupSizes(groupSizes);
}
StringGrouper(char[] groupCharacters, int... groupSizes) {
setGroupChars(groupCharacters);
setGroupSizes(groupSizes);
}
public StringGrouper setGroupChars(char... groupCharacters) {
this.groupCharacters = Optional.ofNullable(groupCharacters)
.orElseThrow(
() -> new IllegalArgumentException(
"groupCharacters is required."));
return this;
}
public char[] getGroupChars() {
return this.groupCharacters.clone();
}
public int[] getGroupSizes() {
return this.groupSizes.clone();
}
public StringGrouper setGroupSizes(int... groupSizes) {
this.groupSizes = Optional
.ofNullable(groupSizes)
.orElseThrow(
() -> new IllegalArgumentException(
"groupSizes is required.")).clone();
return this;
}
public StringGrouper setReverse(boolean reverse) {
this.reverse = reverse;
return this;
}
public boolean isReverse() {
return this.reverse;
}
public String group(String input) {
// strip way starting and ending alpha chars
StringBuilder builder = new StringBuilder(4);
String start;
String end;
char[] inputArr = input.toCharArray();
for (char ch : inputArr) {
if (Character.isDigit(ch)) {
break;
}
builder.append(ch);
}
start = builder.toString();
builder.setLength(0);
for (int i = inputArr.length - 1; i >= 0; i--) {
if (Character.isDigit(inputArr[i])) {
break;
}
builder.insert(0, inputArr[i]);
}
end = builder.toString();
builder.setLength(0);
builder.append(start);
builder.append(groupNumeric(input.substring(start.length(),
input.length() - end.length())));
builder.append(end);
return builder.toString();
}
public String groupNumeric(String input) {
if (groupSizes.length == 0 || groupCharacters.length == 0) {
return input;
}
if (reverse) {
return formatInternalReverse(input);
}
int groupIndex = 0;
int sizeIndex = 0;
char groupChar = groupCharacters[groupIndex];
int groupSize = groupSizes[sizeIndex];
if (groupSize <= 0) {
// Bad case
return input;
}
char[] group = new char[groupSize];
int pos = input.length();
StringBuilder result = new StringBuilder(input.length() + 4);
while (pos > 0) {
if (groupSize == 0) {
// Bad case
return input;
}
int start = pos - groupSize;
if (!(result.length() == 0)) {
result.insert(0, groupChar);
// move characters/sizes forward if possible.
if (groupIndex < (groupCharacters.length - 1)) {
groupChar = groupCharacters[++groupIndex];
}
}
if (start >= 0) {
input.getChars(start, pos, group, 0);
result.insert(0, group, 0, groupSize);
pos -= groupSize;
if (sizeIndex < (groupSizes.length - 1)) {
groupSize = groupSizes[++sizeIndex];
if (groupSize > group.length) {
group = new char[groupSize];
}
}
} else {
input.getChars(0, pos, group, 0);
result.insert(0, group, 0, pos);
break;
}
}
return result.toString();
}
private String formatInternalReverse(String input) {
int groupIndex = 0;
int sizeIndex = 0;
char groupChar = groupCharacters[groupIndex];
int groupSize = groupSizes[sizeIndex];
if (groupSize <= 0) {
// Bad case
return input;
}
char[] group = new char[groupSize];
int pos = 0;
StringBuilder result = new StringBuilder(input.length() + 4);
while (pos < input.length()) {
if (groupSize == 0) {
// Bad case
return input;
}
int end = pos + groupSize;
if (!(result.length() == 0)) {
result.append(groupChar);
// move characters/sizes forward if possible.
if (groupIndex < (groupCharacters.length - 1)) {
groupChar = groupCharacters[++groupIndex];
}
}
if (end <= input.length()) {
input.getChars(pos, end, group, 0);
result.append(group, 0, groupSize);
pos += groupSize;
if (sizeIndex < (groupSizes.length - 1)) {
groupSize = groupSizes[++sizeIndex];
if (groupSize > group.length) {
group = new char[groupSize];
}
}
} else {
input.getChars(pos, input.length(), group, 0);
result.append(group, 0, input.length() - pos);
break;
}
}
return result.toString();
}
}