Module datarush.matching
Package com.pervasive.datarush.matching.block

Class BlockSelf

  • All Implemented Interfaces:
    LogicalOperator
    public class BlockSelf
extends CompositeOperator
    Block records from a single source into groups of like records based on a set of key fields and generate record pairs from these groups. Blocking records in this way allows reduces the number of record pairs generated which leads to many less comparison operations. This can dramatically speed up execution of record matching if the keys are trustworthy.

    • Constructor Detail

      • BlockSelf

        public BlockSelf()
        Block records from a single source. Records from the source will be blocked based on key sets and record pairs generated from these groups. Key fields must be identified before execution.
        See Also:
        setKeys(String[])

    • Method Detail

      • getInput

        public RecordPort getInput()
        Gets the record port providing the input to the pair generation.
        Returns:
        the input port for the operation

      • getOutput

        public RecordPort getOutput()
        Gets the record port providing the results of the pair generation.
        Returns:
        the output port for the operation

      • getLeftFieldPattern

        public String getLeftFieldPattern()
        Gets the output naming pattern for fields on the left hand side of the pair.
        Returns:
        the pattern for the left hand side field names in output.

      • setLeftFieldPattern

        public void setLeftFieldPattern​(String pattern)
        Sets the output naming pattern for fields on the left hand side of pairs. This is used to ensure distinct names in the output pairs.
        Parameters:
        pattern - name pattern for the left hand side field names

      • getRightFieldPattern

        public String getRightFieldPattern()
        Gets the output naming pattern for fields on the right hand side of the pair.
        Returns:
        the pattern for the right hand side field names in output.

      • setRightFieldPattern

        public void setRightFieldPattern​(String pattern)
        Sets the output naming pattern for fields on the right hand side of pairs. This is used to ensure distinct names in the output pairs.
        Parameters:
        pattern - name pattern for the eight hand side field names

      • getKeys

        public String[] getKeys()
        Get the fields being used for blocking
        Returns:
        the set of key fields

      • setKeys

        public void setKeys​(String[] keys)
        Set the fields to use as keys for blocking. Only record pairs where these keys are equal will be output.
        Parameters:
        keys - the set of key fields

      • compose

        protected void compose​(CompositionContext ctx)
        Description copied from class: CompositeOperator
        Compose the body of this operator. Implementations should do the following:
        1. Perform any validation of configuration, input types, etc
        2. Instantiate and configure sub-operators, adding them to the provided context via the method OperatorComposable.add(O)
        3. Create necessary connections via the method OperatorComposable.connect(P, P). This includes connections from the composite's input ports to sub-operators, connections between sub-operators, and connections from sub-operators output ports to the composite's output ports
        Specified by:
        compose in class CompositeOperator
        Parameters:
        ctx - the context