| /* |
| * Copyright (c) 2011 Google Inc. |
| * |
| * All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse |
| * Public License v1.0 which accompanies this distribution, and is available at |
| * |
| * http://www.eclipse.org/legal/epl-v10.html |
| */ |
| package com.google.eclipse.protobuf.conversion; |
| |
| import static java.lang.Double.NEGATIVE_INFINITY; |
| import static java.lang.Double.NaN; |
| import static java.lang.Double.POSITIVE_INFINITY; |
| |
| import static org.eclipse.xtext.util.Strings.isEmpty; |
| |
| import static com.google.common.collect.Maps.newHashMap; |
| |
| import java.util.Map; |
| |
| import org.eclipse.xtext.conversion.ValueConverterException; |
| import org.eclipse.xtext.conversion.impl.AbstractLexerBasedConverter; |
| import org.eclipse.xtext.nodemodel.INode; |
| |
| /** |
| * Converts floating-point numbers to {@code double}s. |
| * |
| * @author alruiz@google.com (Alex Ruiz) |
| */ |
| public class DOUBLEValueConverter extends AbstractLexerBasedConverter<Double> { |
| private static final Map<String, Double> PREDEFINED_VALUES = newHashMap(); |
| |
| static { |
| PREDEFINED_VALUES.put("nan", NaN); |
| PREDEFINED_VALUES.put("inf", POSITIVE_INFINITY); |
| PREDEFINED_VALUES.put("-inf", NEGATIVE_INFINITY); |
| } |
| |
| /** |
| * Creates an {@code float} from the given input, if the given input represents a floating-point number. |
| * @param string the given input. |
| * @param node the parsed node including hidden parts. |
| * @return the new {@code float}. |
| * @throws ValueConverterException if the given input is {@code null}, empty or does not represent a floating-point |
| * number. |
| */ |
| @Override public Double toValue(String string, INode node) throws ValueConverterException { |
| if (isEmpty(string)) { |
| throw new ValueConverterException("Couldn't convert empty string to double.", node, null); |
| } |
| Double predefinedValue = PREDEFINED_VALUES.get(string); |
| if (predefinedValue != null) { |
| return predefinedValue; |
| } |
| try { |
| return Double.parseDouble(string); |
| } catch (NumberFormatException e) { |
| throw parsingError(string, node, e); |
| } |
| } |
| |
| private ValueConverterException parsingError(String string, INode node, Exception cause) { |
| return new ValueConverterException("Couldn't convert '" + string + "' to double.", node, cause); |
| } |
| } |