alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Lift Framework example source code file (ParseDouble.scala)

This example Lift Framework source code file (ParseDouble.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lift Framework tags/keywords

bigdecimal, bigdecimal, brokendouble, brokendouble, double, error, none, none, option, parsedouble, some, string, string, use

The Lift Framework ParseDouble.scala source code

/*
 * Copyright 2011 WorldWide Conferencing, LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.liftweb
package common

/**
 * Safely parse a String into a Double, avoiding the JVM bug
 * that causes the thread to hang if the String is
 * 2.2250738585072012e-308
 *
 * This wonkaround is not recommended anymore. Instead consider using a
 * newer version of JVM which has the necessary fix.
 *
 * @see http://blogs.oracle.com/security/entry/security_alert_for_cve-2010-44
 */
@deprecated("Use a newer or patched JVM instead.")
object ParseDouble {
  private val BrokenDouble = BigDecimal("2.2250738585072012e-308")

  /**
   * Parse a String to a Double avoiding the
   * JVM parsing bug.  May throw NumberFormatException
   * if the String is not properly formatted
   */
  def apply(str: String): Double = {
    val d = BigDecimal(str)
    if (d == BrokenDouble) error("Error parsing 2.2250738585072012e-308")
    else d.doubleValue
  }

  /**
   * A handy dandy extractor
   */
  def unapply(in: String): Option[Double] = try {
    Some(apply(in))
  } catch {
    case e: Exception => None
  }
}

Other Lift Framework examples (source code examples)

Here is a short list of links related to this Lift Framework ParseDouble.scala source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.