StringToNumberConverterTest.java :  » IDE-Eclipse » jface » org » eclipse » core » tests » databinding » conversion » Java Open Source

/*******************************************************************************
 * 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.tests.databinding.conversion;

import java.math.BigInteger;

import junit.framework.TestCase;

import org.eclipse.core.databinding.conversion.StringToNumberConverter;

import com.ibm.icu.text.NumberFormat;

/**
 * @since 1.1
 */
//TODO test for ICU4Js BigDecimal
public class StringToNumberConverterTest extends TestCase {
  private NumberFormat numberFormat;
  private NumberFormat numberIntegerFormat;

  /*
   * (non-Javadoc)
   * 
   * @see junit.framework.TestCase#setUp()
   */
  protected void setUp() throws Exception {
    super.setUp();
    numberFormat = NumberFormat.getInstance();
    numberIntegerFormat = NumberFormat.getIntegerInstance();
  }

  public void testToTypes() throws Exception {
    assertEquals("Integer.class", Integer.class, StringToNumberConverter.toInteger(false).getToType());
    assertEquals("Integer.TYPE", Integer.TYPE, StringToNumberConverter.toInteger(true).getToType());
    assertEquals("Double.class", Double.class, StringToNumberConverter.toDouble(false).getToType());
    assertEquals("Double.TYPE", Double.TYPE, StringToNumberConverter.toDouble(true).getToType());
    assertEquals("Long.class", Long.class, StringToNumberConverter.toLong(false).getToType());
    assertEquals("Long.TYPE", Long.TYPE, StringToNumberConverter.toLong(true).getToType());
    assertEquals("Float.class", Float.class, StringToNumberConverter.toFloat(false).getToType());
    assertEquals("Float.TYPE", Float.TYPE, StringToNumberConverter.toFloat(true).getToType());
    assertEquals("BigInteger.TYPE", BigInteger.class, StringToNumberConverter.toBigInteger().getToType());
  }
  
  public void testFromTypeIsString() throws Exception {
    assertEquals(String.class, StringToNumberConverter.toInteger(false)
        .getFromType());
  }
  
  public void testConvertsToBigInteger() throws Exception {
    BigInteger input = BigInteger.valueOf(1000);
    
    StringToNumberConverter converter = StringToNumberConverter.toBigInteger();
    BigInteger result = (BigInteger) converter.convert(numberFormat.format(input));
    
    assertEquals(input, result);
  }
  
  public void testConvertsToInteger() throws Exception {
    Integer input = new Integer(1000);

    StringToNumberConverter converter = StringToNumberConverter.toInteger(false);
    Integer result = (Integer) converter.convert(numberIntegerFormat.format(input
        .longValue()));
    assertEquals(input, result);
  }

  public void testConvertsToDouble() throws Exception {
    Double input = new Double(1000);

    StringToNumberConverter converter = StringToNumberConverter.toDouble(false);
    Double result = (Double) converter.convert(numberFormat.format(input
        .doubleValue()));

    assertEquals(input, result);
  }

  public void testConvertsToLong() throws Exception {
    Long input = new Long(1000);

    StringToNumberConverter converter = StringToNumberConverter.toLong(false);
    Long result = (Long) converter.convert(numberIntegerFormat.format(input
        .longValue()));

    assertEquals(input, result);
  }

  public void testConvertsToFloat() throws Exception {
    Float input = new Float(1000);

    StringToNumberConverter converter = StringToNumberConverter.toFloat(false);
    Float result = (Float) converter.convert(numberFormat.format(input
        .floatValue()));

    assertEquals(input, result);
  }

  public void testConvertedToIntegerPrimitive() throws Exception {
    Integer input = new Integer(1000);

    StringToNumberConverter converter = StringToNumberConverter.toInteger(true);
    Integer result = (Integer) converter.convert(numberIntegerFormat.format(input
        .longValue()));
    assertEquals(input, result);
  }

  public void testConvertsToDoublePrimitive() throws Exception {
    Double input = new Double(1000);

    StringToNumberConverter converter = StringToNumberConverter.toDouble(true);
    Double result = (Double) converter.convert(numberFormat.format(input
        .doubleValue()));

    assertEquals(input, result);
  }

  public void testConvertsToLongPrimitive() throws Exception {
    Long input = new Long(1000);

    StringToNumberConverter converter = StringToNumberConverter.toLong(true);
    Long result = (Long) converter.convert(numberIntegerFormat.format(input
        .longValue()));

    assertEquals(input, result);
  }

  public void testConvertsToFloatPrimitive() throws Exception {
    Float input = new Float(1000);

    StringToNumberConverter converter = StringToNumberConverter.toFloat(true);
    Float result = (Float) converter.convert(numberFormat.format(input
        .floatValue()));

    assertEquals(input, result);
  }
  
  public void testReturnsNullBoxedTypeForEmptyString() throws Exception {
    StringToNumberConverter converter = StringToNumberConverter.toInteger(false);
    try {
      assertNull(converter.convert(""));
    } catch (Exception e) {
      fail("exception should not have been thrown");
    }
  }

  public void testThrowsIllegalArgumentExceptionIfAskedToConvertNonString()
      throws Exception {
    StringToNumberConverter converter = StringToNumberConverter.toInteger(false);
    try {
      converter.convert(new Integer(1));
      fail("exception should have been thrown");
    } catch (IllegalArgumentException e) {
    }
  }
  
  /**
   * Asserts a use case where the integer starts with a valid value but ends
   * in an unparsable format.
   * 
   * @throws Exception
   */
  public void testInvalidInteger() throws Exception {
    StringToNumberConverter converter = StringToNumberConverter
        .toInteger(false);

    try {
      converter.convert("1 1 1");
      fail("exception should have been thrown");
    } catch (IllegalArgumentException e) {
    }
  }
  
  public void testThrowsIllegalArgumentExceptionIfNumberIsOutOfRange() throws Exception {
    StringToNumberConverter converter = StringToNumberConverter.toInteger(false);
    try {
      converter.convert(numberFormat.format(Long.MAX_VALUE));
      fail("exception should have been thrown");
    } catch (IllegalArgumentException e) {
    }
  }
}