| /******************************************************************************* |
| * Copyright (c) 2007, 2010 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 |
| *******************************************************************************/ |
| |
| package org.eclipse.core.internal.databinding.conversion; |
| |
| 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, |
| boolean primitive) { |
| if (!(value instanceof String)) { |
| throw new IllegalArgumentException( |
| "Value to convert is not a String"); //$NON-NLS-1$ |
| } |
| |
| String source = (String) value; |
| ParseResult result = new ParseResult(); |
| if (!primitive && source.trim().length() == 0) { |
| return result; |
| } |
| |
| synchronized (numberFormat) { |
| ParsePosition position = new ParsePosition(0); |
| Number parseResult = null; |
| parseResult = numberFormat.parse(source, position); |
| |
| if (position.getIndex() != 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, new Object[] { |
| value, new Integer(errorIndex + 1), |
| new Character(value.charAt(errorIndex)) }); |
| } |
| return BindingMessages.formatString( |
| BindingMessages.VALIDATE_NUMBER_PARSE_ERROR_NO_CHARACTER, |
| new Object[] { 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", new 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 boolean 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 boolean checkInteger(Number number, int bitLength) { |
| BigInteger bigInteger = null; |
| |
| if (number instanceof Integer || number instanceof Long) { |
| bigInteger = BigInteger.valueOf(number.longValue()); |
| } else if (number instanceof Float || number instanceof Double) { |
| double doubleValue = number.doubleValue(); |
| if (!Double.isNaN(doubleValue) |
| && doubleValue != Double.NEGATIVE_INFINITY |
| && doubleValue != Double.POSITIVE_INFINITY) { |
| bigInteger = new BigDecimal(doubleValue).toBigInteger(); |
| } else { |
| return false; |
| } |
| } else if (number instanceof BigInteger) { |
| bigInteger = (BigInteger) number; |
| } else if (number instanceof BigDecimal) { |
| bigInteger = ((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 != 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 boolean 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 boolean inFloatRange(Number number) { |
| return checkDecimal(number, FLOAT_MIN_BIG_DECIMAL, |
| FLOAT_MAX_BIG_DECIMAL); |
| } |
| |
| private static boolean checkDecimal(Number number, BigDecimal min, |
| BigDecimal max) { |
| BigDecimal bigDecimal = null; |
| if (number instanceof Integer || number instanceof Long) { |
| bigDecimal = new BigDecimal(number.doubleValue()); |
| } else if (number instanceof Float || number instanceof Double) { |
| double doubleValue = number.doubleValue(); |
| |
| if (!Double.isNaN(doubleValue) |
| && doubleValue != Double.NEGATIVE_INFINITY |
| && doubleValue != Double.POSITIVE_INFINITY) { |
| bigDecimal = new BigDecimal(doubleValue); |
| } else { |
| return false; |
| } |
| } else if (number instanceof BigInteger) { |
| bigDecimal = new BigDecimal((BigInteger) number); |
| } else if (number instanceof BigDecimal) { |
| bigDecimal = (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. |
| */ |
| // if this is ever taken out, take care to un-comment the throw |
| // clause and the if condition below, they were commented because |
| // the |
| // compiler complained about dead code.. |
| bigDecimal = new BigDecimal(number.doubleValue()); |
| } |
| |
| /* if (bigDecimal != 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 boolean 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 boolean 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 boolean inByteRange(Number number) { |
| return checkInteger(number, 7); |
| } |
| } |