Package org.springframework.expression.spel

Interface CompilableIndexAccessor

All Superinterfaces:

IndexAccessor, Opcodes, TargetedAccessor

All Known Implementing Classes:

ReflectiveIndexAccessor

public interface CompilableIndexAccessor
extends IndexAccessor, Opcodes

A compilable IndexAccessor is able to generate bytecode that represents the operation for reading the index, facilitating compilation to bytecode of expressions that use the accessor.

Since:

6.2

Author:

Sam Brannen

Field Summary

Fields inherited from interface org.springframework.asm.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, ASM10_EXPERIMENTAL, ASM4, ASM5, ASM6, ASM7, ASM8, ASM9, 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, 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, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SOURCE_DEPRECATED, SOURCE_MASK, SWAP, 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, V22, V23, V9

Method Summary

Modifier and Type	Method	Description
void	generateCode(SpelNode indexNode, MethodVisitor methodVisitor, CodeFlow codeFlow)	Generate bytecode that performs the operation for reading the index.
Class<?>	getIndexedValueType()	Get the type of the indexed value.
boolean	isCompilable()	Determine if this IndexAccessor is currently suitable for compilation.

Methods inherited from interface org.springframework.expression.IndexAccessor

canRead, canWrite, read, write

Methods inherited from interface org.springframework.expression.TargetedAccessor

getSpecificTargetClasses

Method Details

isCompilable

boolean isCompilable()

Determine if this IndexAccessor is currently suitable for compilation.

May only be known once the index has been read.

See Also:

• IndexAccessor.read(org.springframework.expression.EvaluationContext, Object, Object)

getIndexedValueType

Class<?> getIndexedValueType()

Get the type of the indexed value.

For example, given the expression book.authors[0], the indexed value type represents the result of authors[0] which may be an Author object, a String representing the author's name, etc.

May only be known once the index has been read.

See Also:

• IndexAccessor.read(org.springframework.expression.EvaluationContext, Object, Object)

generateCode

void generateCode(SpelNode indexNode,
 MethodVisitor methodVisitor,
 CodeFlow codeFlow)

Generate bytecode that performs the operation for reading the index.

Bytecode should be generated into the supplied MethodVisitor using context information from the CodeFlow where necessary.

The supplied indexNode should be used to generate the appropriate bytecode to load the index onto the stack. For example, given the expression book.authors[0], invoking codeFlow.generateCodeForArgument(methodVisitor, indexNode, int.class) will ensure that the index (0) is available on the stack as a primitive int.

Will only be invoked if isCompilable() returns true.

Parameters:

indexNode - the SpelNode that represents the index being accessed

methodVisitor - the ASM MethodVisitor into which code should be generated

codeFlow - the current state of the expression compiler