程序包 cn.taketoday.expression.spel.ast

类 Indexer

java.lang.Object

cn.taketoday.expression.spel.ast.SpelNodeImpl

cn.taketoday.expression.spel.ast.Indexer

所有已实现的接口:

Opcodes, SpelNode

public class Indexer
extends SpelNodeImpl

An Indexer can index into some proceeding structure to access a particular piece of it. Supported structures are: strings / collections (lists/sets) / arrays.

从以下版本开始:

4.0

作者:

Andy Clement, Phillip Webb, Stephane Nicoll, Sam Brannen

嵌套类概要

嵌套类

修饰符和类型	类	说明
private class	Indexer.ArrayIndexingValueRef
private class	Indexer.CollectionIndexingValueRef
private static enum	Indexer.IndexedType
private class	Indexer.MapIndexingValueRef
private class	Indexer.PropertyIndexingValueRef
private class	Indexer.StringIndexingLValue

字段概要

字段

修饰符和类型	字段	说明
private PropertyAccessor	cachedReadAccessor
private String	cachedReadName
private Class<?>	cachedReadTargetType
private PropertyAccessor	cachedWriteAccessor
private String	cachedWriteName
private Class<?>	cachedWriteTargetType
private Indexer.IndexedType	indexedType

从类继承的字段 cn.taketoday.expression.spel.ast.SpelNodeImpl

children, exitTypeDescriptor

从接口继承的字段 cn.taketoday.bytecode.Opcodes

AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_MANDATED, ACC_MODULE, ACC_NATIVE, ACC_OPEN, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_RECORD, ACC_STATIC, ACC_STATIC_PHASE, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_TRANSITIVE, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, ASTORE, ATHROW, BALOAD, BASTORE, BIPUSH, CALOAD, CASTORE, CHECKCAST, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DMUL, DNEG, DOUBLE, DREM, DRETURN, DSTORE, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F_APPEND, F_CHOP, F_FULL, F_NEW, F_SAME, F_SAME1, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAT, FMUL, FNEG, FREM, FRETURN, FSTORE, FSUB, GETFIELD, GETSTATIC, GOTO, H_GETFIELD, H_GETSTATIC, H_INVOKEINTERFACE, H_INVOKESPECIAL, H_INVOKESTATIC, H_INVOKEVIRTUAL, H_NEWINVOKESPECIAL, H_PUTFIELD, H_PUTSTATIC, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IFEQ, IFGE, IFGT, IFLE, IFLT, IFNE, IFNONNULL, IFNULL, IINC, ILOAD, IMUL, INEG, INSTANCEOF, INTEGER, INVOKEDYNAMIC, INVOKEINTERFACE, INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISUB, IUSHR, IXOR, JAVA_VERSION, JSR, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDIV, LLOAD, LMUL, LNEG, LONG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, NULL, POP, POP2, PRIVATE_FINAL_STATIC, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SOURCE_DEPRECATED, SOURCE_MASK, SWAP, SWITCH_STYLE_HASH, SWITCH_STYLE_HASHONLY, SWITCH_STYLE_TRIE, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V_PREVIEW, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V10, V11, V12, V13, V14, V15, V16, V17, V18, V19, V20, V21, V9

构造器概要

构造器

构造器	说明
Indexer(int startPos, int endPos, SpelNodeImpl expr)

方法概要

修饰符和类型	方法	说明
private Object	accessArrayElement(Object ctx, int idx)
private void	checkAccess(int arrayLength, int index)
private <T> T	convertValue(TypeConverter converter, Object value, Class<T> targetType)
void	generateCode(MethodVisitor mv, CodeFlow cf)	Generate the bytecode for this node into the supplied visitor.
TypedValue	getValueInternal(ExpressionState state)
protected ValueRef	getValueRef(ExpressionState state)
boolean	isCompilable()	Check whether a node can be compiled to bytecode.
boolean	isWritable(ExpressionState expressionState)	Determine if this expression node will support a setValue() call.
private void	setArrayElement(TypeConverter converter, Object ctx, int idx, Object newValue, Class<?> arrayComponentType)
void	setValue(ExpressionState state, Object newValue)	Evaluate the expression to a node and then set the new value on that node.
String	toStringAST()	Return the string form the this AST node.

从类继承的方法 cn.taketoday.expression.spel.ast.SpelNodeImpl

generateCodeForArgument, generateCodeForArguments, getChild, getChildCount, getEndPosition, getExitDescriptor, getObjectClass, getStartPosition, getTypedValue, getValue, getValue, nextChildIs, setValueInternal

从类继承的方法 java.lang.Object

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

字段详细资料

cachedReadName

@Nullable
private String cachedReadName

cachedReadTargetType

@Nullable
private Class<?> cachedReadTargetType

cachedReadAccessor

@Nullable
private PropertyAccessor cachedReadAccessor

cachedWriteName

@Nullable
private String cachedWriteName

cachedWriteTargetType

@Nullable
private Class<?> cachedWriteTargetType

cachedWriteAccessor

@Nullable
private PropertyAccessor cachedWriteAccessor

indexedType

@Nullable
private Indexer.IndexedType indexedType

构造器详细资料

Indexer

public Indexer(int startPos,
 int endPos,
 SpelNodeImpl expr)

方法详细资料

getValueInternal

public TypedValue getValueInternal(ExpressionState state)
                            throws EvaluationException

指定者:

getValueInternal 在类中 SpelNodeImpl

抛出:

EvaluationException

setValue

public void setValue(ExpressionState state,
 @Nullable
 Object newValue)
              throws EvaluationException

从接口复制的说明: SpelNode

Evaluate the expression to a node and then set the new value on that node. For example, if the expression evaluates to a property reference, then the property will be set to the new value.

指定者:

setValue 在接口中 SpelNode

覆盖:

setValue 在类中 SpelNodeImpl

参数:

state - the current expression state (includes the context)

newValue - the new value

抛出:

EvaluationException - if any problem occurs evaluating the expression or setting the new value

isWritable

public boolean isWritable(ExpressionState expressionState)
                   throws SpelEvaluationException

从接口复制的说明: SpelNode

Determine if this expression node will support a setValue() call.

指定者:

isWritable 在接口中 SpelNode

覆盖:

isWritable 在类中 SpelNodeImpl

参数:

expressionState - the current expression state (includes the context)

返回:

true if the expression node will allow setValue()

抛出:

SpelEvaluationException

getValueRef

protected ValueRef getValueRef(ExpressionState state)
                        throws EvaluationException

覆盖:

getValueRef 在类中 SpelNodeImpl

抛出:

EvaluationException

isCompilable

public boolean isCompilable()

从类复制的说明: SpelNodeImpl

Check whether a node can be compiled to bytecode. The reasoning in each node may be different but will typically involve checking whether the exit type descriptor of the node is known and any relevant child nodes are compilable.

覆盖:

isCompilable 在类中 SpelNodeImpl

返回:

true if this node can be compiled to bytecode

generateCode

public void generateCode(MethodVisitor mv,
 CodeFlow cf)

从类复制的说明: SpelNodeImpl

Generate the bytecode for this node into the supplied visitor. Context info about the current expression being compiled is available in the codeflow object, e.g. including information about the type of the object currently on the stack.

覆盖:

generateCode 在类中 SpelNodeImpl

参数:

mv - the ASM MethodVisitor into which code should be generated

cf - a context object with info about what is on the stack

toStringAST

public String toStringAST()

从接口复制的说明: SpelNode

Return the string form the this AST node.

返回:

the string form

setArrayElement

private void setArrayElement(TypeConverter converter,
 Object ctx,
 int idx,
 @Nullable
 Object newValue,
 Class<?> arrayComponentType)
                      throws EvaluationException

抛出:

EvaluationException

accessArrayElement

private Object accessArrayElement(Object ctx,
 int idx)
                           throws SpelEvaluationException

抛出:

SpelEvaluationException

checkAccess

private void checkAccess(int arrayLength,
 int index)
                  throws SpelEvaluationException

抛出:

SpelEvaluationException

convertValue

private <T> T convertValue(TypeConverter converter,
 @Nullable
 Object value,
 Class<T> targetType)