Java TypeBinding.erasure方法代码示例

import org.eclipse.jdt.internal.compiler.lookup.TypeBinding; //导入方法依赖的package包/类
private static String typeBindingToSignature(TypeBinding binding) {
	binding = binding.erasure();
	if (binding != null && binding.isBaseType()) {
		return new String (binding.sourceName());
	} else if (binding instanceof ReferenceBinding) {
		String pkg = binding.qualifiedPackageName() == null ? "" : new String(binding.qualifiedPackageName());
		String qsn = binding.qualifiedSourceName() == null ? "" : new String(binding.qualifiedSourceName());
		return pkg.isEmpty() ? qsn : (pkg + "." + qsn);
	} else if (binding instanceof ArrayBinding) {
		StringBuilder out = new StringBuilder();
		out.append(typeBindingToSignature(binding.leafComponentType()));
		for (int i = 0; i < binding.dimensions(); i++) out.append("[]");
		return out.toString();
	}
	
	return "";
}
 

import org.eclipse.jdt.internal.compiler.lookup.TypeBinding; //导入方法依赖的package包/类
/**
 * Base types need that the widening is explicitly done by the compiler using some bytecode like i2f.
 * Also check unsafe type operations.
 */
public void computeConversion(Scope scope, TypeBinding runtimeType, TypeBinding compileTimeType) {
	if (runtimeType == null || compileTimeType == null)
		return;
	if (this.implicitConversion != 0) return; // already set independently

	// it is possible for a Byte to be unboxed to a byte & then converted to an int
	// but it is not possible for a byte to become Byte & then assigned to an Integer,
	// or to become an int before boxed into an Integer
	if (runtimeType != TypeBinding.NULL && runtimeType.isBaseType()) {
		if (!compileTimeType.isBaseType()) {
			TypeBinding unboxedType = scope.environment().computeBoxingType(compileTimeType);
			this.implicitConversion = TypeIds.UNBOXING;
			scope.problemReporter().autoboxing(this, compileTimeType, runtimeType);
			compileTimeType = unboxedType;
		}
	} else if (compileTimeType != TypeBinding.NULL && compileTimeType.isBaseType()) {
		TypeBinding boxedType = scope.environment().computeBoxingType(runtimeType);
		if (TypeBinding.equalsEquals(boxedType, runtimeType)) // Object o = 12;
			boxedType = compileTimeType;
		this.implicitConversion = TypeIds.BOXING | (boxedType.id << 4) + compileTimeType.id;
		scope.problemReporter().autoboxing(this, compileTimeType, scope.environment().computeBoxingType(boxedType));
		return;
	} else if (this.constant != Constant.NotAConstant && this.constant.typeID() != TypeIds.T_JavaLangString) {
		this.implicitConversion = TypeIds.BOXING;
		return;
	}
	int compileTimeTypeID, runtimeTypeID;
	if ((compileTimeTypeID = compileTimeType.id) >= TypeIds.T_LastWellKnownTypeId) { // e.g. ? extends String  ==> String (103227); >= TypeIds.T_LastWellKnownTypeId implies TypeIds.NoId
		compileTimeTypeID = compileTimeType.erasure().id == TypeIds.T_JavaLangString ? TypeIds.T_JavaLangString : TypeIds.T_JavaLangObject;
	} else if (runtimeType.isPrimitiveType() && compileTimeType instanceof ReferenceBinding && !compileTimeType.isBoxedPrimitiveType()) {
		compileTimeTypeID = TypeIds.T_JavaLangObject; // treatment is the same as for jlO.
	}

	switch (runtimeTypeID = runtimeType.id) {
		case T_byte :
		case T_short :
		case T_char :
			if (compileTimeTypeID == TypeIds.T_JavaLangObject) {
				this.implicitConversion |= (runtimeTypeID << 4) + compileTimeTypeID;
			} else {
				this.implicitConversion |= (TypeIds.T_int << 4) + compileTimeTypeID;
			}
			break;
		case T_JavaLangString :
		case T_float :
		case T_boolean :
		case T_double :
		case T_int : //implicitConversion may result in i2i which will result in NO code gen
		case T_long :
			this.implicitConversion |= (runtimeTypeID << 4) + compileTimeTypeID;
			break;
		default : // regular object ref
//				if (compileTimeType.isRawType() && runtimeTimeType.isBoundParameterizedType()) {
//				    scope.problemReporter().unsafeRawExpression(this, compileTimeType, runtimeTimeType);
//				}
	}
}
 

import org.eclipse.jdt.internal.compiler.lookup.TypeBinding; //导入方法依赖的package包/类
public void resolveStatements() {

		super.resolveStatements();
		if (this.arguments != null) {
			this.scope.problemReporter().annotationMembersCannotHaveParameters(this);
		}
		if (this.typeParameters != null) {
			this.scope.problemReporter().annotationMembersCannotHaveTypeParameters(this);
		}
		if (this.extendedDimensions != 0) {
			this.scope.problemReporter().illegalExtendedDimensions(this);
		}
		if (this.binding == null) return;
		TypeBinding returnTypeBinding = this.binding.returnType;
		if (returnTypeBinding != null) {

			// annotation methods can only return base types, String, Class, enum type, annotation types and arrays of these
			checkAnnotationMethodType: {
				TypeBinding leafReturnType = returnTypeBinding.leafComponentType();
				if (returnTypeBinding.dimensions() <= 1) { // only 1-dimensional array permitted
					switch (leafReturnType.erasure().id) {
						case T_byte :
						case T_short :
						case T_char :
						case T_int :
						case T_long :
						case T_float :
						case T_double :
						case T_boolean :
						case T_JavaLangString :
						case T_JavaLangClass :
							break checkAnnotationMethodType;
					}
					if (leafReturnType.isEnum() || leafReturnType.isAnnotationType())
						break checkAnnotationMethodType;
				}
				this.scope.problemReporter().invalidAnnotationMemberType(this);
			}
			if (this.defaultValue != null) {
				MemberValuePair pair = new MemberValuePair(this.selector, this.sourceStart, this.sourceEnd, this.defaultValue);
				pair.binding = this.binding;
				pair.resolveTypeExpecting(this.scope, returnTypeBinding);
				this.binding.setDefaultValue(org.eclipse.jdt.internal.compiler.lookup.ElementValuePair.getValue(this.defaultValue));
			} else { // let it know it does not have a default value so it won't try to find it
				this.binding.setDefaultValue(null);
			}
		}
	}
 

import org.eclipse.jdt.internal.compiler.lookup.TypeBinding; //导入方法依赖的package包/类
public void typeMismatchError(TypeBinding actualType, TypeBinding expectedType, ASTNode location, ASTNode expectingLocation) {
	if (this.options.sourceLevel < ClassFileConstants.JDK1_5) { // don't expose type variable names, complain on erased types
		if (actualType instanceof TypeVariableBinding)
			actualType = actualType.erasure();
		if (expectedType instanceof TypeVariableBinding)
			expectedType = expectedType.erasure();
	}
	if (actualType != null && (actualType.tagBits & TagBits.HasMissingType) != 0) { // improve secondary error
		if (location instanceof Annotation) {
			// https://bugs.eclipse.org/bugs/show_bug.cgi?id=376977
			return; // Already reported, don't report a secondary error
		}
		this.handle(
				IProblem.UndefinedType,
				new String[] {new String(actualType.leafComponentType().readableName())},
				new String[] {new String(actualType.leafComponentType().shortReadableName())},
				location.sourceStart,
				location.sourceEnd);
			return;
	}
	if (expectingLocation != null && (expectedType.tagBits & TagBits.HasMissingType) != 0) { // improve secondary error
		this.handle(
				IProblem.UndefinedType,
				new String[] {new String(expectedType.leafComponentType().readableName())},
				new String[] {new String(expectedType.leafComponentType().shortReadableName())},
				expectingLocation.sourceStart,
				expectingLocation.sourceEnd);
			return;
	}

	char[] actualShortReadableName = actualType.shortReadableName();
	char[] expectedShortReadableName = expectedType.shortReadableName();
	char[] actualReadableName = actualType.readableName();
	char[] expectedReadableName = expectedType.readableName();
	if (CharOperation.equals(actualShortReadableName, expectedShortReadableName)) {
		if (CharOperation.equals(actualReadableName, expectedReadableName)) {
			// if full type names are equal, assume the incompatibility is due to mismatching null annotations:
			actualReadableName = actualType.nullAnnotatedReadableName(this.options, false);
			expectedReadableName = expectedType.nullAnnotatedReadableName(this.options, false);
			actualShortReadableName = actualType.nullAnnotatedReadableName(this.options, true);
			expectedShortReadableName = expectedType.nullAnnotatedReadableName(this.options, true);
		} else {
			actualShortReadableName = actualReadableName;
			expectedShortReadableName = expectedReadableName;
		}
	}
	this.handle(
		expectingLocation instanceof ReturnStatement ? IProblem.ReturnTypeMismatch : IProblem.TypeMismatch,
		new String[] {new String(actualReadableName), new String(expectedReadableName)},
		new String[] {new String(actualShortReadableName), new String(expectedShortReadableName)},
		location.sourceStart,
		location.sourceEnd);
}
 

import org.eclipse.jdt.internal.compiler.lookup.TypeBinding; //导入方法依赖的package包/类
/**
 * Base types need that the widening is explicitly done by the compiler using some bytecode like i2f.
 * Also check unsafe type operations.
 */
public void computeConversion(Scope scope, TypeBinding runtimeType, TypeBinding compileTimeType) {
	if (runtimeType == null || compileTimeType == null)
		return;
	if (this.implicitConversion != 0) return; // already set independantly

	// it is possible for a Byte to be unboxed to a byte & then converted to an int
	// but it is not possible for a byte to become Byte & then assigned to an Integer,
	// or to become an int before boxed into an Integer
	if (runtimeType != TypeBinding.NULL && runtimeType.isBaseType()) {
		if (!compileTimeType.isBaseType()) {
			TypeBinding unboxedType = scope.environment().computeBoxingType(compileTimeType);
			this.implicitConversion = TypeIds.UNBOXING;
			scope.problemReporter().autoboxing(this, compileTimeType, runtimeType);
			compileTimeType = unboxedType;
		}
	} else if (compileTimeType != TypeBinding.NULL && compileTimeType.isBaseType()) {
		TypeBinding boxedType = scope.environment().computeBoxingType(runtimeType);
		if (boxedType == runtimeType) // Object o = 12;
			boxedType = compileTimeType;
		this.implicitConversion = TypeIds.BOXING | (boxedType.id << 4) + compileTimeType.id;
		scope.problemReporter().autoboxing(this, compileTimeType, scope.environment().computeBoxingType(boxedType));
		return;
	} else if (this.constant != Constant.NotAConstant && this.constant.typeID() != TypeIds.T_JavaLangString) {
		this.implicitConversion = TypeIds.BOXING;
		return;
	}
	int compileTimeTypeID, runtimeTypeID;
	if ((compileTimeTypeID = compileTimeType.id) == TypeIds.NoId) { // e.g. ? extends String  ==> String (103227)
		compileTimeTypeID = compileTimeType.erasure().id == TypeIds.T_JavaLangString ? TypeIds.T_JavaLangString : TypeIds.T_JavaLangObject;
	}
	switch (runtimeTypeID = runtimeType.id) {
		case T_byte :
		case T_short :
		case T_char :
			if (compileTimeTypeID == TypeIds.T_JavaLangObject) {
				this.implicitConversion |= (runtimeTypeID << 4) + compileTimeTypeID;
			} else {
				this.implicitConversion |= (TypeIds.T_int << 4) + compileTimeTypeID;
			}
			break;
		case T_JavaLangString :
		case T_float :
		case T_boolean :
		case T_double :
		case T_int : //implicitConversion may result in i2i which will result in NO code gen
		case T_long :
			this.implicitConversion |= (runtimeTypeID << 4) + compileTimeTypeID;
			break;
		default : // regular object ref
//				if (compileTimeType.isRawType() && runtimeTimeType.isBoundParameterizedType()) {
//				    scope.problemReporter().unsafeRawExpression(this, compileTimeType, runtimeTimeType);
//				}
	}
}
 

import org.eclipse.jdt.internal.compiler.lookup.TypeBinding; //导入方法依赖的package包/类
public void typeMismatchError(TypeBinding actualType, TypeBinding expectedType, ASTNode location, ASTNode expectingLocation) {
	if (this.options.sourceLevel < ClassFileConstants.JDK1_5) { // don't expose type variable names, complain on erased types
		if (actualType instanceof TypeVariableBinding)
			actualType = actualType.erasure();
		if (expectedType instanceof TypeVariableBinding)
			expectedType = expectedType.erasure();
	}
	if (actualType != null && (actualType.tagBits & TagBits.HasMissingType) != 0) { // improve secondary error
		if (location instanceof Annotation) {
			// https://bugs.eclipse.org/bugs/show_bug.cgi?id=376977
			return; // Already reported, don't report a secondary error
		}
		this.handle(
				IProblem.UndefinedType,
				new String[] {new String(actualType.leafComponentType().readableName())},
				new String[] {new String(actualType.leafComponentType().shortReadableName())},
				location.sourceStart,
				location.sourceEnd);
			return;
	}
	if (expectingLocation != null && (expectedType.tagBits & TagBits.HasMissingType) != 0) { // improve secondary error
		this.handle(
				IProblem.UndefinedType,
				new String[] {new String(expectedType.leafComponentType().readableName())},
				new String[] {new String(expectedType.leafComponentType().shortReadableName())},
				expectingLocation.sourceStart,
				expectingLocation.sourceEnd);
			return;
	}
	char[] actualShortReadableName = actualType.shortReadableName();
	char[] expectedShortReadableName = expectedType.shortReadableName();
	if (CharOperation.equals(actualShortReadableName, expectedShortReadableName)) {
		actualShortReadableName = actualType.readableName();
		expectedShortReadableName = expectedType.readableName();
	}
	this.handle(
		IProblem.TypeMismatch,
		new String[] {new String(actualType.readableName()), new String(expectedType.readableName())},
		new String[] {new String(actualShortReadableName), new String(expectedShortReadableName)},
		location.sourceStart,
		location.sourceEnd);
}