org.apache.sysds.hops.codegen.template

## Class TemplateBase

- java.lang.Object
- - org.apache.sysds.hops.codegen.template.TemplateBase

- Direct Known Subclasses:
    TemplateCell, TemplateOuterProduct, TemplateRow

      public abstract class TemplateBase
      extends Object

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `TemplateBase.CloseType`
    `static class` | `TemplateBase.TemplateType`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `abstract TemplateBase.CloseType` | `close(Hop hop)` Indicates if the template must be closed at the current hop; either due to final operations (e.g., aggregate) or unsupported operations.
    `abstract Pair<Hop[],CNodeTpl>` | `constructCplan(Hop hop, CPlanMemoTable memo, boolean compileLiterals)` Constructs a single cplan rooted at the given hop, according to the plan given in the memo structure for this particular hop and its recursive inputs.
    `boolean` | `equals(Object obj)`
    `abstract boolean` | `fuse(Hop hop, Hop input)` Indicates if the template can be expanded to the given hop starting from an open template at the input.
    `TemplateBase.CloseType` | `getCType()`
    `TemplateBase.TemplateType` | `getType()`
    `int` | `hashCode()`
    `boolean` | `isClosed()`
    `abstract boolean` | `merge(Hop hop, Hop input)` Indicates if the template at the current hop can be expanded by merging another template available for one of its other inputs which is not yet covered by the template of the current hop.
    `abstract boolean` | `open(Hop hop)` Indicates if this template can be opened at the given hop, where hop represents bottom (first operation on the inputs) of the fused operator.

    - ### Methods inherited from class java.lang.Object

      `getClass, notify, notifyAll, toString, wait, wait, wait`

- - ### Method Detail

    - #### getType

          public TemplateBase.TemplateType getType()

    - #### getCType

          public TemplateBase.CloseType getCType()

    - #### isClosed

          public boolean isClosed()

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `Object`

    - #### equals

          public boolean equals(Object obj)

      Overrides:
        `equals` in class `Object`

    - #### open

          public abstract boolean open(Hop hop)

      Indicates if this template can be opened at the given hop, where hop represents bottom (first operation on the inputs) of the fused operator.
      Parameters:
        `hop` - current hop
      Returns:
        true if template can be opened

    - #### fuse

          public abstract boolean fuse(Hop hop,
                                       Hop input)

      Indicates if the template can be expanded to the given hop starting from an open template at the input.
      Parameters:
        `hop` - current hop
        `input` - hop with open template of same type
      Returns:
        true if the current hop can be fused into the operator.

    - #### merge

          public abstract boolean merge(Hop hop,
                                        Hop input)

      Indicates if the template at the current hop can be expanded by merging another template available for one of its other inputs which is not yet covered by the template of the current hop.
      Parameters:
        `hop` - current hop
        `input` - direct input of current hop with available template
      Returns:
        true if the the input hop can be fused into the current hop

    - #### close

          public abstract TemplateBase.CloseType close(Hop hop)

      Indicates if the template must be closed at the current hop; either due to final operations (e.g., aggregate) or unsupported operations.
      Parameters:
        `hop` - current hop
      Returns:
        close type (closed invalid, closed valid, open)

    - #### constructCplan

          public abstract Pair<Hop[],CNodeTpl> constructCplan(Hop hop,
                                                              CPlanMemoTable memo,
                                                              boolean compileLiterals)

      Constructs a single cplan rooted at the given hop, according to the plan given in the memo structure for this particular hop and its recursive inputs.
      Parameters:
        `hop` - root of cplan
        `memo` - memoization table for partial subplans
        `compileLiterals` - if true compile non-integer literals as constants, otherwise variables. note: integer literals are always compiled as constants.
      Returns:
        pair containing hops and code template

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