org.springframework.expression.spel.ast
Class ConstructorReference

java.lang.Object
  org.springframework.expression.spel.ast.SpelNodeImpl
      org.springframework.expression.spel.ast.ConstructorReference

All Implemented Interfaces:

SpelNode

public class ConstructorReference
extends SpelNodeImpl

Represents the invocation of a constructor. Either a constructor on a regular type or construction of an array. When an array is constructed, an initializer can be specified.

Examples:
new String('hello world')
new int[]{1,2,3,4}
new int[3] new int[3]{1,2,3}

Since:

3.0

Author:

Andy Clement, Juergen Hoeller

Field Summary

private ConstructorExecutor	cachedExecutor The cached executor that may be reused on subsequent evaluations.
private SpelNodeImpl[]	dimensions
private boolean	isArrayConstructor

Fields inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

children, pos

Constructor Summary

ConstructorReference(int pos, SpelNodeImpl... arguments)
Create a constructor reference.

ConstructorReference(int pos, SpelNodeImpl[] dimensions, SpelNodeImpl... arguments)
Create a constructor reference.

Method Summary

private TypedValue	createArray(ExpressionState state) Create an array and return it.
private TypedValue	createNewInstance(ExpressionState state) Create a new ordinary object and return it.
private ConstructorExecutor	findExecutorForConstructor(java.lang.String typename, java.util.List<TypeDescriptor> argumentTypes, ExpressionState state) Go through the list of registered constructor resolvers and see if any can find a constructor that takes the specified set of arguments.
TypedValue	getValueInternal(ExpressionState state) Implements getValue() - delegating to the code for building an array or a simple type.
private boolean	hasInitializer()
private void	populateBooleanArray(ExpressionState state, java.lang.Object newArray, TypeConverter typeConverter, InlineList initializer)
private void	populateByteArray(ExpressionState state, java.lang.Object newArray, TypeConverter typeConverter, InlineList initializer)
private void	populateCharArray(ExpressionState state, java.lang.Object newArray, TypeConverter typeConverter, InlineList initializer)
private void	populateDoubleArray(ExpressionState state, java.lang.Object newArray, TypeConverter typeConverter, InlineList initializer)
private void	populateFloatArray(ExpressionState state, java.lang.Object newArray, TypeConverter typeConverter, InlineList initializer)
private void	populateIntArray(ExpressionState state, java.lang.Object newArray, TypeConverter typeConverter, InlineList initializer)
private void	populateLongArray(ExpressionState state, java.lang.Object newArray, TypeConverter typeConverter, InlineList initializer)
private void	populateReferenceTypeArray(ExpressionState state, java.lang.Object newArray, TypeConverter typeConverter, InlineList initializer, java.lang.Class<?> componentType)
private void	populateShortArray(ExpressionState state, java.lang.Object newArray, TypeConverter typeConverter, InlineList initializer)
java.lang.String	toStringAST()

Methods inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

getChild, getChildCount, getEndPosition, getObjectClass, getPreviousChild, getStartPosition, getTypedValue, getValue, getValue, isWritable, nextChildIs, setValue

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

isArrayConstructor

private boolean isArrayConstructor

dimensions

private SpelNodeImpl[] dimensions

cachedExecutor

private volatile ConstructorExecutor cachedExecutor

The cached executor that may be reused on subsequent evaluations.

Constructor Detail

ConstructorReference

public ConstructorReference(int pos,
                            SpelNodeImpl... arguments)

Create a constructor reference. The first argument is the type, the rest are the parameters to the constructor call

ConstructorReference

public ConstructorReference(int pos,
                            SpelNodeImpl[] dimensions,
                            SpelNodeImpl... arguments)

Create a constructor reference. The first argument is the type, the rest are the parameters to the constructor call

Method Detail

getValueInternal

public TypedValue getValueInternal(ExpressionState state)
                            throws EvaluationException

Implements getValue() - delegating to the code for building an array or a simple type.

Specified by:

getValueInternal in class SpelNodeImpl

Throws:

EvaluationException

createNewInstance

private TypedValue createNewInstance(ExpressionState state)
                              throws EvaluationException

Create a new ordinary object and return it.

Parameters:

state - the expression state within which this expression is being evaluated

Returns:

the new object

Throws:

EvaluationException - if there is a problem creating the object

findExecutorForConstructor

private ConstructorExecutor findExecutorForConstructor(java.lang.String typename,
                                                       java.util.List<TypeDescriptor> argumentTypes,
                                                       ExpressionState state)
                                                throws SpelEvaluationException

Go through the list of registered constructor resolvers and see if any can find a constructor that takes the specified set of arguments.

Parameters:

typename - the type trying to be constructed

argumentTypes - the types of the arguments supplied that the constructor must take

state - the current state of the expression

Returns:

a reusable ConstructorExecutor that can be invoked to run the constructor or null

Throws:

SpelEvaluationException - if there is a problem locating the constructor

toStringAST

public java.lang.String toStringAST()

Specified by:

toStringAST in interface SpelNode

Specified by:

toStringAST in class SpelNodeImpl

Returns:

the string form of this AST node

createArray

private TypedValue createArray(ExpressionState state)
                        throws EvaluationException

Create an array and return it.

Parameters:

state - the expression state within which this expression is being evaluated

Returns:

the new array

Throws:

EvaluationException - if there is a problem creating the array

populateReferenceTypeArray

private void populateReferenceTypeArray(ExpressionState state,
                                        java.lang.Object newArray,
                                        TypeConverter typeConverter,
                                        InlineList initializer,
                                        java.lang.Class<?> componentType)

populateByteArray

private void populateByteArray(ExpressionState state,
                               java.lang.Object newArray,
                               TypeConverter typeConverter,
                               InlineList initializer)

populateFloatArray

private void populateFloatArray(ExpressionState state,
                                java.lang.Object newArray,
                                TypeConverter typeConverter,
                                InlineList initializer)

populateDoubleArray

private void populateDoubleArray(ExpressionState state,
                                 java.lang.Object newArray,
                                 TypeConverter typeConverter,
                                 InlineList initializer)

populateShortArray

private void populateShortArray(ExpressionState state,
                                java.lang.Object newArray,
                                TypeConverter typeConverter,
                                InlineList initializer)

populateLongArray

private void populateLongArray(ExpressionState state,
                               java.lang.Object newArray,
                               TypeConverter typeConverter,
                               InlineList initializer)

populateCharArray

private void populateCharArray(ExpressionState state,
                               java.lang.Object newArray,
                               TypeConverter typeConverter,
                               InlineList initializer)

populateBooleanArray

private void populateBooleanArray(ExpressionState state,
                                  java.lang.Object newArray,
                                  TypeConverter typeConverter,
                                  InlineList initializer)

populateIntArray

private void populateIntArray(ExpressionState state,
                              java.lang.Object newArray,
                              TypeConverter typeConverter,
                              InlineList initializer)

hasInitializer

private boolean hasInitializer()