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package ftbsc.lll.proxies;
import org.objectweb.asm.Type;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import static ftbsc.lll.tools.DescriptorBuilder.nameToDescriptor;
/**
* A container for information about class methods to be used
* in ASM patching.
* @since 0.3.0
*/
public class MethodProxy extends AbstractProxy {
/**
* The parameters of the method.
*/
public final Type[] parameters;
/**
* The return type of the method.
*/
public final Type returnType;
/**
* A public constructor, builds a proxy from a {@link Method}
* obtained from reflection.
* @param m the {@link Method} object corresponding to this.
*/
public MethodProxy(Method m) {
super(m.getName(), Type.getType(m), m.getModifiers(), Type.getInternalName(m.getDeclaringClass()));
Type mt = Type.getType(m);
this.parameters = mt.getArgumentTypes();
this.returnType = mt.getReturnType();
}
/**
* A protected constructor, called only from the builder.
* @param name the name of the method
* @param modifiers the modifiers of the method
* @param parent the FQN of the parent class of the method
* @param parameters the parameters of the method
* @param returnType the return type of the method
*/
protected MethodProxy(String name, int modifiers, String parent, Type[] parameters, Type returnType) {
super(name, Type.getMethodType(returnType, parameters), modifiers, parent);
this.parameters = parameters;
this.returnType = returnType;
}
/**
* Returns a new instance of {@link MethodProxy.Builder}.
* @param name the name of the method
* @return the builder object for method proxies
*/
public static Builder builder(String name) {
return new Builder(name);
}
/**
* A builder object for {@link MethodProxy}.
*/
public static class Builder extends AbstractProxy.Builder<MethodProxy> {
/**
* The parameters of the method.
*/
private final List<Type> parameters;
/**
* The return type of the method. Defaults to void.
*/
private Type returnType;
/**
* The constructor of the builder, used only internally.
* @param name the name of the method
*/
Builder(String name) {
super(name);
this.parameters = new ArrayList<>();
this.returnType = Type.getType(void.class);
}
/**
* Adds a parameter of a given type.
* @param fqn the fully qualified name of the parameter type
* @param arrayLevel the array level of the parameter type
* @return the builder's state after the change
*/
public Builder addParameter(String fqn, int arrayLevel) {
this.parameters.add(Type.getType(nameToDescriptor(fqn, arrayLevel)));
return this;
}
/**
* Adds a parameter of a given type.
* @param paramType the {@link Class} object corresponding to
* the parameter type.
* @return the builder's state after the change
*/
public Builder addParameter(Class<?> paramType) {
this.parameters.add(Type.getType(paramType));
return this;
}
/**
* Sets the return type to the given type.
* @param fqn the fully qualified name of the return type
* @param arrayLevel the array level of the return type
* @return the builder's state after the change
*/
public Builder setReturnType(String fqn, int arrayLevel) {
this.returnType = Type.getType(nameToDescriptor(fqn, arrayLevel));
return this;
}
/**
* Sets the return type to the given type.
* @param returnType the {@link Class} object corresponding to
* the return type
* @return the builder's state after the change
*/
public Builder setReturnType(Class<?> returnType) {
this.returnType = Type.getType(returnType);
return this;
}
/**
* Builds a {@link MethodProxy} of the given kind.
* @return the built {@link MethodProxy}
*/
@Override
public MethodProxy build() {
return new MethodProxy(name, modifiers, parent, parameters.toArray(new Type[0]), returnType);
}
}
}
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