Class LargestChainDescriptor

All Implemented Interfaces:
IDescriptor, IMolecularDescriptor

public class LargestChainDescriptor extends AbstractMolecularDescriptor implements IMolecularDescriptor
Class that returns the number of atoms in the largest chain.
Parameters for this descriptor:
Name Default Description
checkAromaticity (deprecated) false Old parameter is now ignored
checkRingSystem false True is the CDKConstant.ISINRING has to be set
Returns a single value named nAtomLAC. Note that a chain exists if there are two or more atoms. Thus single atom molecules will return 0
chhoppe from EUROSCREEN
Dictionary pointer(s):
largestChain in the Descriptors Dictionary [qsar-descriptors:largestChain]
Source code:
Belongs to CDK module:
Created on:
  • Constructor Details

    • LargestChainDescriptor

      public LargestChainDescriptor()
      Constructor for the LargestChain object.
  • Method Details

    • getSpecification

      public DescriptorSpecification getSpecification()
      Returns a Map which specifies which descriptor is implemented by this class. These fields are used in the map:
      • Specification-Reference: refers to an entry in a unique dictionary
      • Implementation-Title: anything
      • Implementation-Identifier: a unique identifier for this version of this class
      • Implementation-Vendor: CDK, JOELib, or anything else
      Specified by:
      getSpecification in interface IDescriptor
      An object containing the descriptor specification
    • setParameters

      public void setParameters(Object[] params) throws CDKException
      Sets the parameters attribute of the LargestChain object. This descriptor takes two parameters, which should be Booleans to indicate whether aromaticity and ring member ship needs been checked (TRUE) or not (FALSE). The first parameter (aromaticity) is deprecated and ignored.
      Specified by:
      setParameters in interface IDescriptor
      params - The new parameters value
      CDKException - if more than one parameter or a non-Boolean parameter is specified
      See Also:
    • getParameters

      public Object[] getParameters()
      Gets the parameters attribute of the LargestChainDescriptor object.
      Specified by:
      getParameters in interface IDescriptor
      The parameters value
      See Also:
    • getDescriptorNames

      public String[] getDescriptorNames()
      Description copied from interface: IDescriptor
      Returns an array of names for each descriptor value calculated. Many descriptors return multiple values. In general it is useful for the descriptor to indicate the names for each value. In many cases, these names can be as simple as X1, X2, ..., XN where X is a prefix and 1, 2, ..., N are the indices. On the other hand it is also possible to return other arbitrary names, which should be documented in the Javadocs for the descriptor (e.g., the CPSA descriptor). Note that by default if a descriptor returns a single value (such as ALOGPDescriptor the return array will have a single element
      Specified by:
      getDescriptorNames in interface IDescriptor
      An array of descriptor names, equal in length to the number of descriptor calculated..
    • calculate

      public DescriptorValue calculate(IAtomContainer atomContainer)
      Calculate the count of atoms of the largest chain in the supplied IAtomContainer.
      Specified by:
      calculate in interface IMolecularDescriptor
      atomContainer - The IAtomContainer for which this descriptor is to be calculated
      the number of atoms in the largest chain of this AtomContainer
      See Also:
    • getDescriptorResultType

      public IDescriptorResult getDescriptorResultType()
      Returns the specific type of the DescriptorResult object. The return value from this method really indicates what type of result will be obtained from the DescriptorValue object. Note that the same result can be achieved by interrogating the DescriptorValue object; this method allows you to do the same thing, without actually calculating the descriptor.
      Specified by:
      getDescriptorResultType in interface IMolecularDescriptor
      an object that implements the IDescriptorResult interface indicating the actual type of values returned by the descriptor in the DescriptorValue object
    • getParameterNames

      public String[] getParameterNames()
      Gets the parameterNames attribute of the LargestPiSystemDescriptor object.
      Specified by:
      getParameterNames in interface IDescriptor
      The parameterNames value
    • getParameterType

      public Object getParameterType(String name)
      Gets the parameterType attribute of the LargestChainDescriptor object.
      Specified by:
      getParameterType in interface IDescriptor
      name - Description of the Parameter
      An Object of class equal to that of the parameter being requested
    • initialise

      public void initialise(IChemObjectBuilder builder)
      Default implementation of initialise allows optional override.
      Specified by:
      initialise in interface IDescriptor
      builder - chem object build