Java SE Runtime Environment

try {

$arguments = @{}

  # Now we can use the $env:chocolateyPackageParameters inside the Chocolatey package
  $packageParameters = $env:chocolateyPackageParameters

  # Default value
  $exclude = $null

  # Now parse the packageParameters using good old regular expression
  if ($packageParameters) {
      $match_pattern = "\/(?<option>([a-zA-Z0-9]+)):(?<value>([`"'])?([a-zA-Z0-9- \(\)\s_\\:\.]+)([`"'])?)|\/(?<option>([a-zA-Z]+))"
      $option_name = 'option'
      $value_name = 'value'

      if ($packageParameters -match $match_pattern ){
          $results = $packageParameters | Select-String $match_pattern -AllMatches
          $results.matches | % {
            $arguments.Add(
                $_.Groups[$option_name].Value.Trim(),
                $_.Groups[$value_name].Value.Trim())
        }
      }
      else
      {
          Throw "Package Parameters were found but were invalid (REGEX Failure)"
      }

      if($arguments.ContainsKey("exclude")) {
          Write-Host "exclude Argument Found"
          $exclude = $arguments["exclude"]
      }

  } else {
      Write-Debug "No Package Parameters Passed in"
  }

  $scriptDir = $(Split-Path -parent $MyInvocation.MyCommand.Definition)
  # Import function to test if JRE in the same version is already installed
  Import-Module (Join-Path $scriptDir 'thisJreInstalled.ps1')
  
  $packageName = 'jre8'
  # Modify these values -----------------------------------------------------
  # Find download URLs at http://www.java.com/en/download/manual.jsp
  $url = 'https://javadl.oracle.com/webapps/download/AutoDL?BundleId=218831_e9e7ea248e2c4826b92b3f075a80e441'
  $checksum32 = '13D5ED94FE40D9403D5D25B1EF46593DC7F96993DF735EA36A32DB3DC8ED8EC7'
  $url64 = 'https://javadl.oracle.com/webapps/download/AutoDL?BundleId=218833_e9e7ea248e2c4826b92b3f075a80e441'
  $checksum64 = '6741ACEFEB3845964534B3821D459B95C7DFA079F104C5041D1F95D3B6B7A502'
  $oldVersion = '8.0.1110.14'
  $version = '8.0.1210.13'
  #--------------------------------------------------------------------------
  $homepath = $version -replace "(\d+\.\d+)\.(\d\d)(.*)",'jre1.$1_$2'
  $installerType = 'exe'
  $installArgs = "/s REBOOT=0 SPONSORS=0 AUTO_UPDATE=0 $32dir"
  $installArgs64 = "/s REBOOT=0 SPONSORS=0 AUTO_UPDATE=0 $64dir"
  $osBitness = Get-ProcessorBits
   
  Write-Output "Searching if new version exists..."
  $thisJreInstalledHash = thisJreInstalled($version)

  # This is the code for both javaruntime and javaruntime-platformspecific packages.
  # If the package is javaruntime-platformspecific, only install the jre version
  # based on the OS bitness, otherwise install both 32- and 64-bit versions
  if ($packageName -match 'platformspecific') {

    if (($thisJreInstalledHash[0]) -or ($thisJreInstalledHash[1])) {
      Write-Output "Java Runtime Environment $version is already installed. Skipping download and installation to avoid 1603 errors."
    } else {
      Install-ChocolateyPackage $packageName $installerType $installArgs $url $url64
    }

  } else {
    # Otherwise it is the javaruntime package which installs by default both 32- and 64-bit jre versions on 64-bit systems.

    # Checks if JRE 32/64-bit in the same version is already installed and if the user excluded 32-bit Java.
    # Otherwise it downloads and installs it.
    # This is to avoid unnecessary downloads and 1603 errors.
    if ($thisJreInstalledHash[0]) 
    {
      Write-Output "Java Runtime Environment $version (32-bit) is already installed. Skipping download and installation"
    } 
    elseif ($exclude -ne "32") 
    {
      Install-ChocolateyPackage $packageName $installerType $installArgs $url -checksum $checksum32 -checksumtype 'sha256'
    } 
    else 
    {
      Write-Output "Java Runtime Environment $Version (32-bit) excluded for installation"
    }

    # Only check for the 64-bit version if the system is 64-bit

    if ($osBitness -eq 64) 
    {
      if ($thisJreInstalledHash[1]) 
      {
        Write-Output "Java Runtime Environment $version (64-bit) is already installed. Skipping download and installation"
      } 
      elseif ($exclude -ne "64") 
      {
        # Here $url64 is used twice to obtain the correct message from Chocolatey
        # that it installed the 64-bit version, otherwise it would display 32-bit,
        # regardless of the actual bitness of the software.
        Install-ChocolateyPackage $packageName $installerType $installArgs64 $url64 $url64 -checksum64 $checksum64 -checksumtype64 'sha256'
      } 
      else 
      {
        Write-Output "Java Runtime Environment $Version (64-bit) excluded for installation"
      }
    }
  }
  #Uninstalls the previous version of Java if either version exists
  Write-Output "Searching if the previous version exists..."
  $oldJreInstalledHash = thisJreInstalled($oldVersion)

  if($oldJreInstalledHash[0]) 
  {
     Write-Warning "Uninstalling JRE version $oldVersion 32bit"
     $32 = $oldJreInstalledHash[0].IdentifyingNumber
     Start-ChocolateyProcessAsAdmin "/qn /norestart /X$32" -exeToRun "msiexec.exe" -validExitCodes @(0,1605,3010)
  }
  if($oldJreInstalledHash[1])
  {
     Write-Warning "Uninstalling JRE version $oldVersion 64bit"
     $64 = $oldJreInstalledHash[1].IdentifyingNumber
     Start-ChocolateyProcessAsAdmin "/qn /norestart /X$64" -exeToRun "msiexec.exe" -validExitCodes @(0,1605,3010)
  }
} catch {
  #Write-ChocolateyFailure $packageName $($_.Exception.Message)
  throw
}

Write-Debug ("Starting " + $MyInvocation.MyCommand.Definition)

$scriptDir = $(Split-Path -parent $MyInvocation.MyCommand.Definition)
# Import function to test if JRE in the same version is already installed
Import-Module (Join-Path $scriptDir 'thisJreInstalled.ps1')

[string]$packageName="Javaruntime"
$version = '8.0.1210.13'
$thisJreInstalledHash = thisJreInstalled($version)

<#
Exit Codes:
    0: Java installed successfully.
    1605: Java is not installed.
    3010: A reboot is required to finish the install.
#>

if($thisJreInstalledHash[0]) 
  {
     Write-Warning "Uninstalling JRE version $Version 32bit"
     $32 = $thisJreInstalledHash[0].IdentifyingNumber
     Start-ChocolateyProcessAsAdmin "/qn /norestart /X$32" -exeToRun "msiexec.exe" -validExitCodes @(0,1605,3010)
  }
  if($thisJreInstalledHash[1])
  {
     Write-Warning "Uninstalling JRE version $Version 64bit"
     $64 = $thisJreInstalledHash[1].IdentifyingNumber
     Start-ChocolateyProcessAsAdmin "/qn /norestart /X$64" -exeToRun "msiexec.exe" -validExitCodes @(0,1605,3010)
  }

Write-Warning "$packageName may require a reboot to complete the uninstallation."

# This function checks if the same version of JRE is already installed on the computer.
# It returns a hash map with a 'x86_32' and 'x86_64'. These values are not empty if the
# same version and bitness of JRE is already installed.
function thisJreInstalled($version) {
  $productSearch = Get-WmiObject -Class Win32_Product | Where-Object {$_.Name -match '^Java \d+ Update \d+'}
  
  # The regexes for the name of the JRE registry entries (32- and 64 bit versions)
  $nameRegex32 = '^Java \d+ Update \d+$'
  $nameRegex64 = '^Java \d+ Update \d+ \(64-bit\)$'
  $versionRegex = $('^' + $version + '\d*$')

  $x86_32 = $productSearch | Where-Object {$_.Name -match $nameRegex32 -and $_.Version -match $versionRegex}
  $x86_64 = $productSearch | Where-Object {$_.Name -match $nameRegex64 -and $_.Version -match $versionRegex}
  if($x86_32 -eq $null)
  {
    $x86_32 = $false
  }
  if($x86_64 -eq $null)
  {
    $x86_64 = $false
  } 
  return $x86_32,$x86_64
}