Mercurial > projects > dwt2
view org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/conversion/StringToNumberParser.d @ 78:0a55d2d5a946
Added file for databinding
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 14 Apr 2009 11:35:29 +0200 |
parents | |
children | 6be48cf9f95c |
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/******************************************************************************* * Copyright (c) 2007, 2008 IBM Corporation and others. * 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 * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ module org.eclipse.core.internal.databinding.conversion.StringToNumberParser; import java.lang.all; import java.math.BigDecimal; import java.math.BigInteger; import java.text.ParsePosition; import org.eclipse.core.internal.databinding.BindingMessages; import com.ibm.icu.text.NumberFormat; /** * Utility class for the parsing of strings to numbers. * * @since 1.0 */ public class StringToNumberParser { private static final BigDecimal FLOAT_MAX_BIG_DECIMAL = new BigDecimal( Float.MAX_VALUE); private static final BigDecimal FLOAT_MIN_BIG_DECIMAL = new BigDecimal( -Float.MAX_VALUE); private static final BigDecimal DOUBLE_MAX_BIG_DECIMAL = new BigDecimal( Double.MAX_VALUE); private static final BigDecimal DOUBLE_MIN_BIG_DECIMAL = new BigDecimal( -Double.MAX_VALUE); /** * @param value * @param numberFormat * @param primitive * @return result */ public static ParseResult parse(Object value, NumberFormat numberFormat, bool primitive) { if (!( null !is cast(String)value )) { throw new IllegalArgumentException( "Value to convert is not a String"); //$NON-NLS-1$ } String source = cast(String) value; ParseResult result = new ParseResult(); if (!primitive && source.trim().length() is 0) { return result; } synchronized (numberFormat) { ParsePosition position = new ParsePosition(0); Number parseResult = null; parseResult = numberFormat.parse(source, position); if (position.getIndex() !is source.length() || position.getErrorIndex() > -1) { result.position = position; } else { result.number = parseResult; } } return result; } /** * The result of a parse operation. * * @since 1.0 */ public static class ParseResult { /* package */Number number; /* package */ParsePosition position; /** * The number as a result of the conversion. <code>null</code> if the * value could not be converted or if the type is not a primitive and * the value was an empty string. * * @return number */ public Number getNumber() { return number; } /** * ParsePosition if an error occurred while parsing. <code>null</code> * if no error occurred. * * @return parse position */ public ParsePosition getPosition() { return position; } } /** * Formats an appropriate message for a parsing error. * * @param value * @param position * @return message */ public static String createParseErrorMessage(String value, ParsePosition position) { int errorIndex = (position.getErrorIndex() > -1) ? position .getErrorIndex() : position.getIndex(); if (errorIndex < value.length()) { return BindingMessages.formatString(BindingMessages.VALIDATE_NUMBER_PARSE_ERROR, [cast(Object) stringcast(value), new Integer(errorIndex + 1), new Character(value.charAt(errorIndex)) ]); } return BindingMessages.formatString(BindingMessages.VALIDATE_NUMBER_PARSE_ERROR_NO_CHARACTER, [cast(Object) stringcast(value), new Integer(errorIndex + 1) ]); } /** * Formats an appropriate message for an out of range error. * * @param minValue * @param maxValue * @param numberFormat when accessed method synchronizes on instance * @return message */ public static String createOutOfRangeMessage(Number minValue, Number maxValue, NumberFormat numberFormat) { String min = null; String max = null; synchronized (numberFormat) { min = numberFormat.format(minValue); max = numberFormat.format(maxValue); } return BindingMessages.formatString( "Validate_NumberOutOfRangeError", [ cast(Object)min, max ]); //$NON-NLS-1$ } /** * Returns <code>true</code> if the provided <code>number</code> is in * the range of a integer. * * @param number * @return <code>true</code> if a valid integer * @throws IllegalArgumentException * if the number type is unsupported */ public static bool inIntegerRange(Number number) { return checkInteger(number, 31); } /** * Validates the range of the provided <code>number</code>. * * @param number * @param bitLength number of bits allowed to be in range * @return <code>true</code> if in range */ private static bool checkInteger(Number number, int bitLength) { BigInteger bigInteger = null; if ( null !is cast(Integer )number || null !is cast(Long)number ) { bigInteger = BigInteger.valueOf(number.longValue()); } else if ( null !is cast(Float )number || null !is cast(Double)number ) { double doubleValue = number.doubleValue(); /* * doubleValue is doubleValue is used to check for NaN because NaN !is * NaN. The only way to check for NaN is to compare that the value * is equal to itself. */ if (doubleValue is doubleValue && doubleValue !is Double.NEGATIVE_INFINITY && doubleValue !is Double.POSITIVE_INFINITY) { bigInteger = (new BigDecimal(doubleValue)).toBigInteger(); } else { return false; } } else if ( null !is cast(BigInteger)number ) { bigInteger = cast(BigInteger) number; } else if ( null !is cast(BigDecimal)number ) { bigInteger = (cast(BigDecimal) number).toBigInteger(); } else { /* * The else is necessary as the ICU4J plugin has it's own BigDecimal * implementation which isn't part of the replacement plugin. So * that this will work we fall back on the double value of the * number. */ bigInteger = (new BigDecimal(number.doubleValue())).toBigInteger(); } if (bigInteger !is null) { return bigInteger.bitLength() <= bitLength; } throw new IllegalArgumentException( "Number of type [" + number.getClass().getName() + "] is not supported."); //$NON-NLS-1$ //$NON-NLS-2$ } /** * Returns <code>true</code> if the provided <code>number</code> is in * the range of a long. * * @param number * @return <code>true</code> if in range * @throws IllegalArgumentException * if the number type is unsupported */ public static bool inLongRange(Number number) { return checkInteger(number, 63); } /** * Returns <code>true</code> if the provided <code>number</code> is in * the range of a float. * * @param number * @return <code>true</code> if in range * @throws IllegalArgumentException * if the number type is unsupported */ public static bool inFloatRange(Number number) { return checkDecimal(number, FLOAT_MIN_BIG_DECIMAL, FLOAT_MAX_BIG_DECIMAL); } private static bool checkDecimal(Number number, BigDecimal min, BigDecimal max) { BigDecimal bigDecimal = null; if ( null !is cast(Integer )number || null !is cast(Long)number ) { bigDecimal = new BigDecimal(number.doubleValue()); } else if ( null !is cast(Float )number || null !is cast(Double)number ) { double doubleValue = number.doubleValue(); /* * doubleValue is doubleValue is used to check for NaN because NaN !is * NaN. The only way to check for NaN is to compare that the value * is equal to itself. */ if (doubleValue is doubleValue && doubleValue !is Double.NEGATIVE_INFINITY && doubleValue !is Double.POSITIVE_INFINITY) { bigDecimal = new BigDecimal(doubleValue); } else { return false; } } else if ( null !is cast(BigInteger)number ) { bigDecimal = new BigDecimal(cast(BigInteger) number); } else if ( null !is cast(BigDecimal)number ) { bigDecimal = cast(BigDecimal) number; } else { /* * The else is necessary as the ICU4J plugin has it's own BigDecimal * implementation which isn't part of the replacement plugin. So * that this will work we fall back on the double value of the * number. */ bigDecimal = new BigDecimal(number.doubleValue()); } if (bigDecimal !is null) { return max.compareTo(bigDecimal) >= 0 && min.compareTo(bigDecimal) <= 0; } throw new IllegalArgumentException( "Number of type [" + number.getClass().getName() + "] is not supported."); //$NON-NLS-1$ //$NON-NLS-2$ } /** * Returns <code>true</code> if the provided <code>number</code> is in * the range of a double. * * @param number * @return <code>true</code> if in range * @throws IllegalArgumentException * if the number type is unsupported */ public static bool inDoubleRange(Number number) { return checkDecimal(number, DOUBLE_MIN_BIG_DECIMAL, DOUBLE_MAX_BIG_DECIMAL); } /** * Returns <code>true</code> if the provided <code>number</code> is in * the range of a short. * * @param number * @return <code>true</code> if in range */ public static bool inShortRange(Number number) { return checkInteger(number, 15); } /** * Returns <code>true</code> if the provided <code>number</code> is in * the range of a byte. * * @param number * @return <code>true</code> if in range */ public static bool inByteRange(Number number) { return checkInteger(number, 7); } }