| /******************************************************************************* |
| * Copyright (c) 2007 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.databinding.conversion; |
| |
| import java.math.BigInteger; |
| |
| import com.ibm.icu.text.NumberFormat; |
| |
| /** |
| * Converts a Number to a String using <code>NumberFormat.format(...)</code>. |
| * This class is thread safe. |
| * |
| * @since 1.0 |
| */ |
| public class NumberToStringConverter extends Converter { |
| private final NumberFormat numberFormat; |
| private final Class fromType; |
| private boolean fromTypeIsLong; |
| private boolean fromTypeIsDecimalType; |
| private boolean fromTypeIsBigInteger; |
| |
| /** |
| * Constructs a new instance. |
| * <p> |
| * Private to restrict public instantiation. |
| * </p> |
| * |
| * @param numberFormat |
| * @param fromType |
| */ |
| private NumberToStringConverter(NumberFormat numberFormat, Class fromType) { |
| super(fromType, String.class); |
| |
| this.numberFormat = numberFormat; |
| this.fromType = fromType; |
| |
| if (Integer.class.equals(fromType) || Integer.TYPE.equals(fromType) |
| || Long.class.equals(fromType) || Long.TYPE.equals(fromType)) { |
| fromTypeIsLong = true; |
| } else if (Float.class.equals(fromType) || Float.TYPE.equals(fromType) |
| || Double.class.equals(fromType) |
| || Double.TYPE.equals(fromType)) { |
| fromTypeIsDecimalType = true; |
| } else if (BigInteger.class.equals(fromType)) { |
| fromTypeIsBigInteger = true; |
| } |
| } |
| |
| /** |
| * Converts the provided <code>fromObject</code> to a <code>String</code>. |
| * If the converter was constructed for an object type, non primitive, a |
| * <code>fromObject</code> of <code>null</code> will be converted to an |
| * empty string. |
| * |
| * @param fromObject |
| * value to convert. May be <code>null</code> if the converter |
| * was constructed for a non primitive type. |
| * @see org.eclipse.core.databinding.conversion.IConverter#convert(java.lang.Object) |
| */ |
| public Object convert(Object fromObject) { |
| // Null is allowed when the type is not primitve. |
| if (fromObject == null && !fromType.isPrimitive()) { |
| return ""; //$NON-NLS-1$ |
| } |
| |
| Number number = (Number) fromObject; |
| String result = null; |
| if (fromTypeIsLong) { |
| synchronized (numberFormat) { |
| result = numberFormat.format(number.longValue()); |
| } |
| } else if (fromTypeIsDecimalType) { |
| synchronized (numberFormat) { |
| result = numberFormat.format(number.doubleValue()); |
| } |
| } else if (fromTypeIsBigInteger) { |
| synchronized (numberFormat) { |
| result = numberFormat.format((BigInteger) number); |
| } |
| } |
| |
| return result; |
| } |
| |
| /** |
| * @param primitive |
| * <code>true</code> if the type is a double |
| * @return Double converter for the default locale |
| */ |
| public static NumberToStringConverter fromDouble(boolean primitive) { |
| return fromDouble(NumberFormat.getNumberInstance(), primitive); |
| } |
| |
| /** |
| * @param numberFormat |
| * @param primitive |
| * @return Double converter with the provided numberFormat |
| */ |
| public static NumberToStringConverter fromDouble(NumberFormat numberFormat, |
| boolean primitive) { |
| return new NumberToStringConverter(numberFormat, |
| (primitive) ? Double.TYPE : Double.class); |
| } |
| |
| /** |
| * @param primitive |
| * <code>true</code> if the type is a long |
| * @return Long converter for the default locale |
| */ |
| public static NumberToStringConverter fromLong(boolean primitive) { |
| return fromLong(NumberFormat.getIntegerInstance(), primitive); |
| } |
| |
| /** |
| * @param numberFormat |
| * @param primitive |
| * @return Long convert with the provided numberFormat |
| */ |
| public static NumberToStringConverter fromLong(NumberFormat numberFormat, |
| boolean primitive) { |
| return new NumberToStringConverter(numberFormat, |
| (primitive) ? Long.TYPE : Long.class); |
| } |
| |
| /** |
| * @param primitive |
| * <code>true</code> if the type is a float |
| * @return Float converter for the default locale |
| */ |
| public static NumberToStringConverter fromFloat(boolean primitive) { |
| return fromFloat(NumberFormat.getNumberInstance(), primitive); |
| } |
| |
| /** |
| * @param numberFormat |
| * @param primitive |
| * @return Float converter with the provided numberFormat |
| */ |
| public static NumberToStringConverter fromFloat(NumberFormat numberFormat, |
| boolean primitive) { |
| return new NumberToStringConverter(numberFormat, |
| (primitive) ? Float.TYPE : Float.class); |
| } |
| |
| /** |
| * @param primitive |
| * <code>true</code> if the type is a int |
| * @return Integer converter for the default locale |
| */ |
| public static NumberToStringConverter fromInteger(boolean primitive) { |
| return fromInteger(NumberFormat.getIntegerInstance(), primitive); |
| } |
| |
| /** |
| * @param numberFormat |
| * @param primitive |
| * @return Integer converter with the provided numberFormat |
| */ |
| public static NumberToStringConverter fromInteger( |
| NumberFormat numberFormat, boolean primitive) { |
| return new NumberToStringConverter(numberFormat, |
| (primitive) ? Integer.TYPE : Integer.class); |
| } |
| |
| /** |
| * @return BigInteger convert for the default locale |
| */ |
| public static NumberToStringConverter fromBigInteger() { |
| return fromBigInteger(NumberFormat.getIntegerInstance()); |
| } |
| |
| /** |
| * @param numberFormat |
| * @return BigInteger converter with the provided numberFormat |
| */ |
| public static NumberToStringConverter fromBigInteger( |
| NumberFormat numberFormat) { |
| return new NumberToStringConverter(numberFormat, BigInteger.class); |
| } |
| } |