DefaultEvaluator (Parsington: The SciJava Expression Parser 1.0.4 API)

java.lang.Object
- org.scijava.parse.eval.AbstractEvaluator
- - org.scijava.parse.eval.AbstractStackEvaluator
  - - org.scijava.parse.eval.AbstractStandardStackEvaluator
    - - org.scijava.parse.eval.DefaultEvaluator

All Implemented Interfaces:

Evaluator, StackEvaluator, StandardEvaluator
```
public class DefaultEvaluator
extends AbstractStandardStackEvaluator
```
An expression evaluator for most standard operators with common built-in types (i.e.: Booleans, Strings and Numbers).
Caveats

This class is a big bag of case logic for various operators and types. Looking at it, you might think: "It sure would be nice to modularize this, with each operation in its own class, with properly declared types, and called dynamically at runtime as appropriate."

"Great idea!" I would reply. Then I would suggest you have a look at the SciJava Ops and ImageJ Ops projects, which do exactly that in an extensible way.

Or maybe you are thinking: "This can't possibly work as well as awesome JVM-based scripting languages like Jython and Groovy..."

To which I would reply: "You are absolutely right! This class is mostly just a demonstration of an extensible, working evaluator built using the org.scijava.parse.eval package. If your use case is only concerned with feature-rich evaluation of standard types, then building on top of a scripting language might make more sense."

Author:

Curtis Rueden

See Also:
The main class, to give it a spin.

Constructor Summary

Constructors
Constructor and Description

DefaultEvaluator()

DefaultEvaluator(ExpressionParser parser)

Constructors
Constructor and Description
`DefaultEvaluator()`
`DefaultEvaluator(ExpressionParser parser)`

Method Summary

Methods
Modifier and Type	Method and Description
`BigDecimal`	`add(BigDecimal a, BigDecimal b)`
`BigInteger`	`add(BigInteger a, BigInteger b)`
`double`	`add(double a, double b)`
`float`	`add(float a, float b)`
`int`	`add(int a, int b)`
`long`	`add(long a, long b)`
`Object`	`add(Object a, Object b)` Applies the `Operators.ADD` operator.
`String`	`add(String a, String b)`
`BigInteger`	`bitwiseAnd(BigInteger a, BigInteger b)`
`int`	`bitwiseAnd(int a, int b)`
`long`	`bitwiseAnd(long a, long b)`
`Object`	`bitwiseAnd(Object a, Object b)` Applies the `Operators.BITWISE_AND` operator.
`BigInteger`	`bitwiseOr(BigInteger a, BigInteger b)`
`int`	`bitwiseOr(int a, int b)`
`long`	`bitwiseOr(long a, long b)`
`Object`	`bitwiseOr(Object a, Object b)` Applies the `Operators.BITWISE_OR` operator.
`Object`	`braces(Object[] args)` Applies the `Operators.BRACES` operator.
`Object`	`brackets(Object[] args)` Applies the `Operators.BRACKETS` operator.
`Object`	`colon(Object a, Object b)` Applies the `Operators.COLON` operator.
`int`	`complement(int a)`
`long`	`complement(long a)`
`Object`	`complement(Object a)` Applies the `Operators.COMPLEMENT` operator.
`BigDecimal`	`div(BigDecimal a, BigDecimal b)`
`BigInteger`	`div(BigInteger a, BigInteger b)`
`double`	`div(double a, double b)`
`float`	`div(float a, float b)`
`int`	`div(int a, int b)`
`long`	`div(long a, long b)`
`Object`	`div(Object a, Object b)` Applies the `Operators.DIV` operator.
`Object`	`dot(Object a, Object b)` Applies the `Operators.DOT` operator.
`Object`	`dotDiv(Object a, Object b)` Applies the `Operators.DOT_DIV` operator.
`Object`	`dotMul(Object a, Object b)` Applies the `Operators.DOT_MUL` operator.
`Object`	`dotPow(Object a, Object b)` Applies the `Operators.DOT_POW` operator.
`Object`	`dotRightDiv(Object a, Object b)` Applies the `Operators.DOT_RIGHT_DIV` operator.
`Object`	`dotTranspose(Object a)` Applies the `Operators.DOT_TRANSPOSE` operator.
`Object`	`equal(Object a, Object b)` Applies the `Operators.EQUAL` operator.
`Object`	`function(Object a, Object b)` Applies the `Function` operator.
`<T> boolean`	`greaterThan(Comparable<T> a, T b)`
`Object`	`greaterThan(Object a, Object b)` Applies the `Operators.GREATER_THAN` operator.
`<T> boolean`	`greaterThanOrEqual(Comparable<T> a, T b)`
`Object`	`greaterThanOrEqual(Object a, Object b)` Applies the `Operators.GREATER_THAN_OR_EQUAL` operator.
`Object`	`instanceOf(Object a, Object b)` Applies the `Operators.INSTANCEOF` operator.
`BigInteger`	`leftShift(BigInteger a, int b)`
`int`	`leftShift(int a, int b)`
`long`	`leftShift(long a, long b)`
`Object`	`leftShift(Object a, Object b)` Applies the `Operators.LEFT_SHIFT` operator.
`<T> boolean`	`lessThan(Comparable<T> a, T b)`
`Object`	`lessThan(Object a, Object b)` Applies the `Operators.LESS_THAN` operator.
`<T> boolean`	`lessThanOrEqual(Comparable<T> a, T b)`
`Object`	`lessThanOrEqual(Object a, Object b)` Applies the `Operators.LESS_THAN_OR_EQUAL` operator.
`boolean`	`logicalAnd(boolean a, boolean b)`
`Object`	`logicalAnd(Object a, Object b)` Applies the `Operators.LOGICAL_AND` operator.
`boolean`	`logicalOr(boolean a, boolean b)`
`Object`	`logicalOr(Object a, Object b)` Applies the `Operators.LOGICAL_OR` operator.
`BigDecimal`	`mod(BigDecimal a, BigDecimal b)`
`BigInteger`	`mod(BigInteger a, BigInteger b)`
`double`	`mod(double a, double b)`
`float`	`mod(float a, float b)`
`int`	`mod(int a, int b)`
`long`	`mod(long a, long b)`
`Object`	`mod(Object a, Object b)` Applies the `Operators.MOD` operator.
`BigDecimal`	`mul(BigDecimal a, BigDecimal b)`
`BigInteger`	`mul(BigInteger a, BigInteger b)`
`double`	`mul(double a, double b)`
`float`	`mul(float a, float b)`
`int`	`mul(int a, int b)`
`long`	`mul(long a, long b)`
`Object`	`mul(Object a, Object b)` Applies the `Operators.MUL` operator.
`BigDecimal`	`neg(BigDecimal num)`
`BigInteger`	`neg(BigInteger num)`
`double`	`neg(double num)`
`float`	`neg(float num)`
`int`	`neg(int num)`
`long`	`neg(long num)`
`Object`	`neg(Object a)` Applies the `Operators.NEG` operator.
`boolean`	`not(boolean a)`
`Object`	`not(Object a)` Applies the `Operators.NOT` operator.
`Object`	`notEqual(Object a, Object b)` Applies the `Operators.NOT_EQUAL` operator.
`Object`	`parens(Object[] args)` Applies the `Operators.PARENS` operator.
`double`	`pos(double num)`
`float`	`pos(float num)`
`int`	`pos(int num)`
`long`	`pos(long num)`
`Object`	`pos(Object a)` Applies the `Operators.POS` operator.
`BigDecimal`	`pow(BigDecimal a, int b)`
`BigInteger`	`pow(BigInteger a, int b)`
`double`	`pow(double a, double b)`
`Object`	`pow(Object a, Object b)` Applies the `Operators.POW` operator.
`Object`	`rightDiv(Object a, Object b)` Applies the `Operators.RIGHT_DIV` operator.
`BigInteger`	`rightShift(BigInteger a, int b)`
`int`	`rightShift(int a, int b)`
`long`	`rightShift(long a, long b)`
`Object`	`rightShift(Object a, Object b)` Applies the `Operators.RIGHT_SHIFT` operator.
`BigDecimal`	`sub(BigDecimal a, BigDecimal b)`
`BigInteger`	`sub(BigInteger a, BigInteger b)`
`double`	`sub(double a, double b)`
`float`	`sub(float a, float b)`
`int`	`sub(int a, int b)`
`long`	`sub(long a, long b)`
`Object`	`sub(Object a, Object b)` Applies the `Operators.SUB` operator.
`Object`	`transpose(Object a)` Applies the `Operators.TRANSPOSE` operator.
`int`	`unsignedRightShift(int a, int b)`
`long`	`unsignedRightShift(long a, long b)`
`Object`	`unsignedRightShift(Object a, Object b)` Applies the `Operators.UNSIGNED_RIGHT_SHIFT` operator.

Methods inherited from class org.scijava.parse.eval.AbstractStandardStackEvaluator
addAssign, andAssign, assign, divAssign, dotDivAssign, dotPowAssign, dotRightDivAssign, execute, leftShiftAssign, modAssign, mulAssign, orAssign, postDec, postInc, powAssign, preDec, preInc, rightDivAssign, rightShiftAssign, subAssign, unsignedRightShiftAssign

Methods inherited from class org.scijava.parse.eval.AbstractStackEvaluator
evaluate

Methods inherited from class org.scijava.parse.eval.AbstractEvaluator
evaluate, evaluate, get, getParser, isStrict, set, setAll, setStrict, value

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.scijava.parse.eval.Evaluator
evaluate, evaluate, evaluate, get, getParser, isStrict, set, setAll, setStrict, value

Constructor Detail

DefaultEvaluator
```
public DefaultEvaluator()
```

DefaultEvaluator

public DefaultEvaluator(ExpressionParser parser)

Method Detail

function
```
public Object function(Object a,
              Object b)
```
Description copied from interface: StandardEvaluator

Applies the Function operator.

dot
```
public Object dot(Object a,
         Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.DOT operator.

parens
```
public Object parens(Object[] args)
```
Description copied from interface: StandardEvaluator

Applies the Operators.PARENS operator.

brackets
```
public Object brackets(Object[] args)
```
Description copied from interface: StandardEvaluator

Applies the Operators.BRACKETS operator.

braces
```
public Object braces(Object[] args)
```
Description copied from interface: StandardEvaluator

Applies the Operators.BRACES operator.

transpose
```
public Object transpose(Object a)
```
Description copied from interface: StandardEvaluator

Applies the Operators.TRANSPOSE operator.

dotTranspose
```
public Object dotTranspose(Object a)
```
Description copied from interface: StandardEvaluator

Applies the Operators.DOT_TRANSPOSE operator.

pow
```
public Object pow(Object a,
         Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.POW operator.

pow

public double pow(double a,
         double b)

pow

public BigInteger pow(BigInteger a,
             int b)

pow

public BigDecimal pow(BigDecimal a,
             int b)

dotPow
```
public Object dotPow(Object a,
            Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.DOT_POW operator.

pos
```
public Object pos(Object a)
```
Description copied from interface: StandardEvaluator

Applies the Operators.POS operator.

pos
```
public int pos(int num)
```

pos
```
public long pos(long num)
```

pos
```
public float pos(float num)
```

pos
```
public double pos(double num)
```

neg
```
public Object neg(Object a)
```
Description copied from interface: StandardEvaluator

Applies the Operators.NEG operator.

neg
```
public int neg(int num)
```

neg
```
public long neg(long num)
```

neg
```
public float neg(float num)
```

neg
```
public double neg(double num)
```

neg

public BigInteger neg(BigInteger num)

neg

public BigDecimal neg(BigDecimal num)

complement
```
public Object complement(Object a)
```
Description copied from interface: StandardEvaluator

Applies the Operators.COMPLEMENT operator.

complement
```
public int complement(int a)
```

complement
```
public long complement(long a)
```

not
```
public Object not(Object a)
```
Description copied from interface: StandardEvaluator

Applies the Operators.NOT operator.

not
```
public boolean not(boolean a)
```

mul
```
public Object mul(Object a,
         Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.MUL operator.

mul
```
public int mul(int a,
      int b)
```

mul

public long mul(long a,
       long b)

mul

public float mul(float a,
        float b)

mul

public double mul(double a,
         double b)

mul

public BigInteger mul(BigInteger a,
             BigInteger b)

mul

public BigDecimal mul(BigDecimal a,
             BigDecimal b)

div
```
public Object div(Object a,
         Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.DIV operator.

div
```
public int div(int a,
      int b)
```

div

public long div(long a,
       long b)

div

public float div(float a,
        float b)

div

public double div(double a,
         double b)

div

public BigInteger div(BigInteger a,
             BigInteger b)

div

public BigDecimal div(BigDecimal a,
             BigDecimal b)

mod
```
public Object mod(Object a,
         Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.MOD operator.

mod
```
public int mod(int a,
      int b)
```

mod

public long mod(long a,
       long b)

mod

public float mod(float a,
        float b)

mod

public double mod(double a,
         double b)

mod

public BigInteger mod(BigInteger a,
             BigInteger b)

mod

public BigDecimal mod(BigDecimal a,
             BigDecimal b)

rightDiv
```
public Object rightDiv(Object a,
              Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.RIGHT_DIV operator.

dotMul
```
public Object dotMul(Object a,
            Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.DOT_MUL operator.

dotDiv
```
public Object dotDiv(Object a,
            Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.DOT_DIV operator.

dotRightDiv
```
public Object dotRightDiv(Object a,
                 Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.DOT_RIGHT_DIV operator.

add
```
public Object add(Object a,
         Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.ADD operator.

add

public String add(String a,
         String b)

add
```
public int add(int a,
      int b)
```

add

public long add(long a,
       long b)

add

public float add(float a,
        float b)

add

public double add(double a,
         double b)

add

public BigInteger add(BigInteger a,
             BigInteger b)

add

public BigDecimal add(BigDecimal a,
             BigDecimal b)

sub
```
public Object sub(Object a,
         Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.SUB operator.

sub
```
public int sub(int a,
      int b)
```

sub

public long sub(long a,
       long b)

sub

public float sub(float a,
        float b)

sub

public double sub(double a,
         double b)

sub

public BigInteger sub(BigInteger a,
             BigInteger b)

sub

public BigDecimal sub(BigDecimal a,
             BigDecimal b)

leftShift
```
public Object leftShift(Object a,
               Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.LEFT_SHIFT operator.

leftShift

public int leftShift(int a,
            int b)

leftShift

public long leftShift(long a,
             long b)

leftShift

public BigInteger leftShift(BigInteger a,
                   int b)

rightShift
```
public Object rightShift(Object a,
                Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.RIGHT_SHIFT operator.

rightShift

public int rightShift(int a,
             int b)

rightShift

public long rightShift(long a,
              long b)

rightShift

public BigInteger rightShift(BigInteger a,
                    int b)

unsignedRightShift
```
public Object unsignedRightShift(Object a,
                        Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.UNSIGNED_RIGHT_SHIFT operator.

unsignedRightShift

public int unsignedRightShift(int a,
                     int b)

unsignedRightShift

public long unsignedRightShift(long a,
                      long b)

colon
```
public Object colon(Object a,
           Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.COLON operator.

lessThan
```
public Object lessThan(Object a,
              Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.LESS_THAN operator.

lessThan

public <T> boolean lessThan(Comparable<T> a,
                   T b)

greaterThan
```
public Object greaterThan(Object a,
                 Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.GREATER_THAN operator.

greaterThan

public <T> boolean greaterThan(Comparable<T> a,
                      T b)

lessThanOrEqual
```
public Object lessThanOrEqual(Object a,
                     Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.LESS_THAN_OR_EQUAL operator.

lessThanOrEqual

public <T> boolean lessThanOrEqual(Comparable<T> a,
                          T b)

greaterThanOrEqual
```
public Object greaterThanOrEqual(Object a,
                        Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.GREATER_THAN_OR_EQUAL operator.

greaterThanOrEqual

public <T> boolean greaterThanOrEqual(Comparable<T> a,
                             T b)

instanceOf
```
public Object instanceOf(Object a,
                Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.INSTANCEOF operator.

equal
```
public Object equal(Object a,
           Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.EQUAL operator.

notEqual
```
public Object notEqual(Object a,
              Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.NOT_EQUAL operator.

bitwiseAnd
```
public Object bitwiseAnd(Object a,
                Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.BITWISE_AND operator.

bitwiseAnd

public int bitwiseAnd(int a,
             int b)

bitwiseAnd

public long bitwiseAnd(long a,
              long b)

bitwiseAnd

public BigInteger bitwiseAnd(BigInteger a,
                    BigInteger b)

bitwiseOr
```
public Object bitwiseOr(Object a,
               Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.BITWISE_OR operator.

bitwiseOr

public int bitwiseOr(int a,
            int b)

bitwiseOr

public long bitwiseOr(long a,
             long b)

bitwiseOr

public BigInteger bitwiseOr(BigInteger a,
                   BigInteger b)

logicalAnd
```
public Object logicalAnd(Object a,
                Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.LOGICAL_AND operator.

logicalAnd

public boolean logicalAnd(boolean a,
                 boolean b)

logicalOr
```
public Object logicalOr(Object a,
               Object b)
```
Description copied from interface: StandardEvaluator

Applies the Operators.LOGICAL_OR operator.

logicalOr

public boolean logicalOr(boolean a,
                boolean b)

Class DefaultEvaluator

Caveats

Constructor Summary

Method Summary

Methods inherited from class org.scijava.parse.eval.AbstractStandardStackEvaluator

Methods inherited from class org.scijava.parse.eval.AbstractStackEvaluator

Methods inherited from class org.scijava.parse.eval.AbstractEvaluator

Methods inherited from class java.lang.Object

Methods inherited from interface org.scijava.parse.eval.Evaluator

Constructor Detail

DefaultEvaluator

DefaultEvaluator

Method Detail

function

dot

parens

brackets

braces

transpose

dotTranspose

pow

pow

pow

pow

dotPow

pos

pos

pos

pos

pos

neg

neg

neg

neg

neg

neg

neg

complement

complement

complement

not

not

mul

mul

mul

mul

mul

mul

mul

div

div

div

div

div

div

div

mod

mod

mod

mod

mod

mod

mod

rightDiv

dotMul

dotDiv

dotRightDiv

add

add

add

add

add

add

add

add

sub

sub

sub

sub

sub