Java Code Examples for org.springframework.expression.spel.CodeFlow#insertCheckCast()

The following examples show how to use org.springframework.expression.spel.CodeFlow#insertCheckCast() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: SpelNodeImpl.java    From spring-analysis-note with MIT License 6 votes vote down vote up 
/**
 * Ask an argument to generate its bytecode and then follow it up
 * with any boxing/unboxing/checkcasting to ensure it matches the expected parameter descriptor.
 */
protected static void generateCodeForArgument(MethodVisitor mv, CodeFlow cf, SpelNodeImpl argument, String paramDesc) {
	cf.enterCompilationScope();
	argument.generateCode(mv, cf);
	String lastDesc = cf.lastDescriptor();
	Assert.state(lastDesc != null, "No last descriptor");
	boolean primitiveOnStack = CodeFlow.isPrimitive(lastDesc);
	// Check if need to box it for the method reference?
	if (primitiveOnStack && paramDesc.charAt(0) == 'L') {
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	else if (paramDesc.length() == 1 && !primitiveOnStack) {
		CodeFlow.insertUnboxInsns(mv, paramDesc.charAt(0), lastDesc);
	}
	else if (!paramDesc.equals(lastDesc)) {
		// This would be unnecessary in the case of subtyping (e.g. method takes Number but Integer passed in)
		CodeFlow.insertCheckCast(mv, paramDesc);
	}
	cf.exitCompilationScope();
}
Example 2
Source File: SpelNodeImpl.java    From java-technology-stack with MIT License 6 votes vote down vote up 
/**
 * Ask an argument to generate its bytecode and then follow it up
 * with any boxing/unboxing/checkcasting to ensure it matches the expected parameter descriptor.
 */
protected static void generateCodeForArgument(MethodVisitor mv, CodeFlow cf, SpelNodeImpl argument, String paramDesc) {
	cf.enterCompilationScope();
	argument.generateCode(mv, cf);
	String lastDesc = cf.lastDescriptor();
	Assert.state(lastDesc != null, "No last descriptor");
	boolean primitiveOnStack = CodeFlow.isPrimitive(lastDesc);
	// Check if need to box it for the method reference?
	if (primitiveOnStack && paramDesc.charAt(0) == 'L') {
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	else if (paramDesc.length() == 1 && !primitiveOnStack) {
		CodeFlow.insertUnboxInsns(mv, paramDesc.charAt(0), lastDesc);
	}
	else if (!paramDesc.equals(lastDesc)) {
		// This would be unnecessary in the case of subtyping (e.g. method takes Number but Integer passed in)
		CodeFlow.insertCheckCast(mv, paramDesc);
	}
	cf.exitCompilationScope();
}
Example 3
Source File: SpelNodeImpl.java    From lams with GNU General Public License v2.0 6 votes vote down vote up 
/**
 * Ask an argument to generate its bytecode and then follow it up
 * with any boxing/unboxing/checkcasting to ensure it matches the expected parameter descriptor.
 */
protected static void generateCodeForArgument(MethodVisitor mv, CodeFlow cf, SpelNodeImpl argument, String paramDesc) {
	cf.enterCompilationScope();
	argument.generateCode(mv, cf);
	String lastDesc = cf.lastDescriptor();
	boolean primitiveOnStack = CodeFlow.isPrimitive(lastDesc);
	// Check if need to box it for the method reference?
	if (primitiveOnStack && paramDesc.charAt(0) == 'L') {
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	else if (paramDesc.length() == 1 && !primitiveOnStack) {
		CodeFlow.insertUnboxInsns(mv, paramDesc.charAt(0), lastDesc);
	}
	else if (!paramDesc.equals(lastDesc)) {
		// This would be unnecessary in the case of subtyping (e.g. method takes Number but Integer passed in)
		CodeFlow.insertCheckCast(mv, paramDesc);
	}
	cf.exitCompilationScope();
}
Example 4
Source File: SpelNodeImpl.java    From spring4-understanding with Apache License 2.0 6 votes vote down vote up 
/**
 * Ask an argument to generate its bytecode and then follow it up
 * with any boxing/unboxing/checkcasting to ensure it matches the expected parameter descriptor.
 */
protected static void generateCodeForArgument(MethodVisitor mv, CodeFlow cf, SpelNodeImpl argument, String paramDesc) {
	cf.enterCompilationScope();
	argument.generateCode(mv, cf);
	boolean primitiveOnStack = CodeFlow.isPrimitive(cf.lastDescriptor());
	// Check if need to box it for the method reference?
	if (primitiveOnStack && paramDesc.charAt(0) == 'L') {
		CodeFlow.insertBoxIfNecessary(mv, cf.lastDescriptor().charAt(0));
	}
	else if (paramDesc.length() == 1 && !primitiveOnStack) {
		CodeFlow.insertUnboxInsns(mv, paramDesc.charAt(0), cf.lastDescriptor());
	}
	else if (!cf.lastDescriptor().equals(paramDesc)) {
		// This would be unnecessary in the case of subtyping (e.g. method takes Number but Integer passed in)
		CodeFlow.insertCheckCast(mv, paramDesc);
	}
	cf.exitCompilationScope();
}
Example 5
Source File: MapAccessor.java    From spring-analysis-note with MIT License 5 votes vote down vote up 
@Override
public void generateCode(String propertyName, MethodVisitor mv, CodeFlow cf) {
	String descriptor = cf.lastDescriptor();
	if (descriptor == null || !descriptor.equals("Ljava/util/Map")) {
		if (descriptor == null) {
			cf.loadTarget(mv);
		}
		CodeFlow.insertCheckCast(mv, "Ljava/util/Map");
	}
	mv.visitLdcInsn(propertyName);
	mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "get","(Ljava/lang/Object;)Ljava/lang/Object;",true);
}
Example 6
Source File: VariableReference.java    From spring-analysis-note with MIT License 5 votes vote down vote up 
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	if (this.name.equals(ROOT)) {
		mv.visitVarInsn(ALOAD,1);
	}
	else {
		mv.visitVarInsn(ALOAD, 2);
		mv.visitLdcInsn(this.name);
		mv.visitMethodInsn(INVOKEINTERFACE, "org/springframework/expression/EvaluationContext", "lookupVariable", "(Ljava/lang/String;)Ljava/lang/Object;",true);
	}
	CodeFlow.insertCheckCast(mv, this.exitTypeDescriptor);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
Example 7
Source File: MapAccessor.java    From java-technology-stack with MIT License 5 votes vote down vote up 
@Override
public void generateCode(String propertyName, MethodVisitor mv, CodeFlow cf) {
	String descriptor = cf.lastDescriptor();
	if (descriptor == null || !descriptor.equals("Ljava/util/Map")) {
		if (descriptor == null) {
			cf.loadTarget(mv);
		}
		CodeFlow.insertCheckCast(mv, "Ljava/util/Map");
	}
	mv.visitLdcInsn(propertyName);
	mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "get","(Ljava/lang/Object;)Ljava/lang/Object;",true);
}
Example 8
Source File: VariableReference.java    From java-technology-stack with MIT License 5 votes vote down vote up 
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	if (this.name.equals(ROOT)) {
		mv.visitVarInsn(ALOAD,1);
	}
	else {
		mv.visitVarInsn(ALOAD, 2);
		mv.visitLdcInsn(this.name);
		mv.visitMethodInsn(INVOKEINTERFACE, "org/springframework/expression/EvaluationContext", "lookupVariable", "(Ljava/lang/String;)Ljava/lang/Object;",true);
	}
	CodeFlow.insertCheckCast(mv, this.exitTypeDescriptor);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
Example 9
Source File: MapAccessor.java    From lams with GNU General Public License v2.0 5 votes vote down vote up 
@Override
public void generateCode(String propertyName, MethodVisitor mv, CodeFlow cf) {
	String descriptor = cf.lastDescriptor();
	if (descriptor == null || !descriptor.equals("Ljava/util/Map")) {
		if (descriptor == null) {
			cf.loadTarget(mv);
		}
		CodeFlow.insertCheckCast(mv, "Ljava/util/Map");
	}
	mv.visitLdcInsn(propertyName);
	mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "get","(Ljava/lang/Object;)Ljava/lang/Object;",true);
}
Example 10
Source File: VariableReference.java    From lams with GNU General Public License v2.0 5 votes vote down vote up 
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	if (this.name.equals(ROOT)) {
		mv.visitVarInsn(ALOAD,1);
	}
	else {
		mv.visitVarInsn(ALOAD, 2);
		mv.visitLdcInsn(name);
		mv.visitMethodInsn(INVOKEINTERFACE, "org/springframework/expression/EvaluationContext", "lookupVariable", "(Ljava/lang/String;)Ljava/lang/Object;",true);
	}
	CodeFlow.insertCheckCast(mv,this.exitTypeDescriptor);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
Example 11
Source File: MapAccessor.java    From spring4-understanding with Apache License 2.0 5 votes vote down vote up 
@Override
public void generateCode(String propertyName, MethodVisitor mv, CodeFlow cf) {
	String descriptor = cf.lastDescriptor();
	if (descriptor == null || !descriptor.equals("Ljava/util/Map")) {
		if (descriptor == null) {
			cf.loadTarget(mv);
		}
		CodeFlow.insertCheckCast(mv, "Ljava/util/Map");
	}
	mv.visitLdcInsn(propertyName);
	mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "get","(Ljava/lang/Object;)Ljava/lang/Object;",true);
}
Example 12
Source File: VariableReference.java    From spring4-understanding with Apache License 2.0 5 votes vote down vote up 
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	if (this.name.equals(ROOT)) {
		mv.visitVarInsn(ALOAD,1);
	}
	else {
		mv.visitVarInsn(ALOAD, 2);
		mv.visitLdcInsn(name);
		mv.visitMethodInsn(INVOKEINTERFACE, "org/springframework/expression/EvaluationContext", "lookupVariable", "(Ljava/lang/String;)Ljava/lang/Object;",true);
	}
	CodeFlow.insertCheckCast(mv,this.exitTypeDescriptor);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
Example 13
Source File: ReadMapAccessor.java    From poi-tl with Apache License 2.0 5 votes vote down vote up 
@Override
public void generateCode(String propertyName, MethodVisitor mv, CodeFlow cf) {
    String descriptor = cf.lastDescriptor();
    if (descriptor == null || !descriptor.equals("Ljava/util/Map")) {
        if (descriptor == null) {
            cf.loadTarget(mv);
        }
        CodeFlow.insertCheckCast(mv, "Ljava/util/Map");
    }
    mv.visitLdcInsn(propertyName);
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "get", "(Ljava/lang/Object;)Ljava/lang/Object;", true);
}
Example 14
Source File: MethodReference.java    From lams with GNU General Public License v2.0 4 votes vote down vote up 
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	CachedMethodExecutor executorToCheck = this.cachedExecutor;
	if (executorToCheck == null || !(executorToCheck.get() instanceof ReflectiveMethodExecutor)) {
		throw new IllegalStateException("No applicable cached executor found: " + executorToCheck);
	}

	ReflectiveMethodExecutor methodExecutor = (ReflectiveMethodExecutor) executorToCheck.get();
	Method method = methodExecutor.getMethod();
	boolean isStaticMethod = Modifier.isStatic(method.getModifiers());
	String descriptor = cf.lastDescriptor();

	if (descriptor == null) {
		if (!isStaticMethod) {
			// Nothing on the stack but something is needed
			cf.loadTarget(mv);
		}
	}
	else {
		if (isStaticMethod) {
			// Something on the stack when nothing is needed
			mv.visitInsn(POP);
		}
	}
	
	if (CodeFlow.isPrimitive(descriptor)) {
		CodeFlow.insertBoxIfNecessary(mv, descriptor.charAt(0));
	}

	String classDesc = (Modifier.isPublic(method.getDeclaringClass().getModifiers()) ?
			method.getDeclaringClass().getName().replace('.', '/') :
			methodExecutor.getPublicDeclaringClass().getName().replace('.', '/'));
	if (!isStaticMethod) {
		if (descriptor == null || !descriptor.substring(1).equals(classDesc)) {
			CodeFlow.insertCheckCast(mv, "L" + classDesc);
		}
	}

	generateCodeForArguments(mv, cf, method, this.children);
	mv.visitMethodInsn((isStaticMethod ? INVOKESTATIC : INVOKEVIRTUAL), classDesc, method.getName(),
			CodeFlow.createSignatureDescriptor(method), method.getDeclaringClass().isInterface());
	cf.pushDescriptor(this.exitTypeDescriptor);
}
Example 15
Source File: MethodReference.java    From spring4-understanding with Apache License 2.0 4 votes vote down vote up 
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	CachedMethodExecutor executorToCheck = this.cachedExecutor;
	if (executorToCheck == null || !(executorToCheck.get() instanceof ReflectiveMethodExecutor)) {
		throw new IllegalStateException("No applicable cached executor found: " + executorToCheck);
	}

	ReflectiveMethodExecutor methodExecutor = (ReflectiveMethodExecutor) executorToCheck.get();
	Method method = methodExecutor.getMethod();
	boolean isStaticMethod = Modifier.isStatic(method.getModifiers());
	String descriptor = cf.lastDescriptor();

	if (descriptor == null) {
		if (!isStaticMethod) {
			// Nothing on the stack but something is needed
			cf.loadTarget(mv);
		}
	}
	else {
		if (isStaticMethod) {
			// Something on the stack when nothing is needed
			mv.visitInsn(POP);
		}
	}
	
	if (CodeFlow.isPrimitive(descriptor)) {
		CodeFlow.insertBoxIfNecessary(mv, descriptor.charAt(0));
	}

	String classDesc = (Modifier.isPublic(method.getDeclaringClass().getModifiers()) ?
			method.getDeclaringClass().getName().replace('.', '/') :
			methodExecutor.getPublicDeclaringClass().getName().replace('.', '/'));
	if (!isStaticMethod) {
		if (descriptor == null || !descriptor.substring(1).equals(classDesc)) {
			CodeFlow.insertCheckCast(mv, "L" + classDesc);
		}
	}

	generateCodeForArguments(mv, cf, method, this.children);
	mv.visitMethodInsn((isStaticMethod ? INVOKESTATIC : INVOKEVIRTUAL), classDesc, method.getName(),
			CodeFlow.createSignatureDescriptor(method), method.getDeclaringClass().isInterface());
	cf.pushDescriptor(this.exitTypeDescriptor);
}