org.thymeleaf.standard.expression.NumberTokenExpression Maven / Gradle / Ivy
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Modern server-side Java template engine for both web and standalone environments
/*
* =============================================================================
*
* Copyright (c) 2011-2018, The THYMELEAF team (http://www.thymeleaf.org)
*
* 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.thymeleaf.standard.expression;
import java.math.BigDecimal;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.IExpressionContext;
import org.thymeleaf.util.StringUtils;
/**
*
* Number token (Thymeleaf Standard Expressions)
*
*
* Note a class with this name existed since 1.1, but it was completely reimplemented
* in Thymeleaf 3.0
*
*
* @author Daniel Fernández
*
* @since 3.0.0
*
*/
public final class NumberTokenExpression extends Token {
private static final Logger logger = LoggerFactory.getLogger(NumberTokenExpression.class);
private static final long serialVersionUID = -3729844055243242571L;
public static final char DECIMAL_POINT = '.';
static Number computeValue(final String value) {
final BigDecimal bigDecimalValue = new BigDecimal(value);
if (bigDecimalValue.scale() > 0) {
return bigDecimalValue;
}
return bigDecimalValue.toBigInteger();
}
public NumberTokenExpression(final String value) {
super(computeValue(value));
}
@Override
public String getStringRepresentation() {
final Object value = getValue();
if (value instanceof BigDecimal) {
return ((BigDecimal)getValue()).toPlainString();
}
return value.toString();
}
static NumberTokenExpression parseNumberTokenExpression(final String input) {
if (StringUtils.isEmptyOrWhitespace(input)) {
return null;
}
boolean decimalFound = false;
final int inputLen = input.length();
for (int i = 0; i < inputLen; i++) {
final char c = input.charAt(i);
if (Character.isDigit(c)) {
continue;
} else if (c == DECIMAL_POINT) {
if (decimalFound) {
return null;
}
decimalFound = true;
continue;
} else {
return null;
}
}
try {
return new NumberTokenExpression(input);
} catch (final NumberFormatException e) {
// It seems after all it wasn't valid as a number
return null;
}
}
static Object executeNumberTokenExpression(
final IExpressionContext context,
final NumberTokenExpression expression,
final StandardExpressionExecutionContext expContext) {
if (logger.isTraceEnabled()) {
logger.trace("[THYMELEAF][{}] Evaluating number token: \"{}\"", TemplateEngine.threadIndex(), expression.getStringRepresentation());
}
return expression.getValue();
}
}
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