78 lines
2.3 KiB
Java
78 lines
2.3 KiB
Java
/*
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* Copyright 2023 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package rife.render;
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import rife.template.Template;
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import rife.template.ValueRenderer;
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/**
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* <p>Swap case of a template value.</p>
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*
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* <p>Usage:</p>
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*
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* <pre>
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* <!--v render:rife.render.SwapCase:valueId/-->
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* {{v render:rife.render.SwapCase:valueId/}}
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* </pre>
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*
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* @author <a href="https://erik.thauvin.net/">Erik C. Thauvin</a>
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* @since 1.0
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*/
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public class SwapCase implements ValueRenderer {
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/**
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* Swaps the case of a String.
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*
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* @param src the String to swap the case of
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* @return the modified String or null
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*/
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public static String swapCase(final String src) {
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if (src == null || src.isEmpty()) {
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return src;
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}
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int offset = 0;
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var len = src.length();
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var buff = new int[len];
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for (var i = 0; i < len; ) {
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int newCodePoint;
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var curCodePoint = src.codePointAt(i);
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if (Character.isUpperCase(curCodePoint) || Character.isTitleCase(curCodePoint)) {
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newCodePoint = Character.toLowerCase(curCodePoint);
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} else if (Character.isLowerCase(curCodePoint)) {
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newCodePoint = Character.toUpperCase(curCodePoint);
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} else {
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newCodePoint = curCodePoint;
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}
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buff[offset++] = newCodePoint;
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i += Character.charCount(newCodePoint);
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}
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return new String(buff, 0, offset);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public String render(Template template, String valueId, String differentiator) {
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if (template.hasValueId(differentiator)) {
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return swapCase(template.getValue(differentiator));
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} else {
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return "";
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}
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}
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}
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