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package ftbsc.lll.proxies;
import ftbsc.lll.tools.DescriptorBuilder;
import org.objectweb.asm.Type;
import java.lang.reflect.Field;
/**
* A container for information about class fields to be used
* in ASM patching.
* @since 0.3.0
*/
public class FieldProxy extends AbstractProxy {
/**
* The descriptor of the field's type.
*/
private final String typeDescriptor;
/**
* A public constructor, builds a proxy from a {@link Field}
* obtained from reflection.
* @param f the {@link Field} object corresponding to this.
*/
public FieldProxy(Field f) {
super(f.getName(), f.getModifiers(), Type.getInternalName(f.getDeclaringClass()));
this.typeDescriptor = Type.getDescriptor(f.getType());
}
/**
* A protected constructor, called only from the builder.
* @param name the name of the field
* @param modifiers the modifiers of the field
* @param parent the FQN of the parent class of the field
* @param typeDescriptor the type descriptor of the field
*/
FieldProxy(String name, int modifiers, String parent, String typeDescriptor) {
super(name, modifiers, parent);
this.typeDescriptor = typeDescriptor;
}
/**
* @return the field's type descriptor
*/
@Override
public String getDescriptor() {
return typeDescriptor;
}
/**
* Returns a new instance of {@link FieldProxy.Builder}.
* @param name the name of the field
* @return the builder object for field proxies
*/
public static Builder builder(String name) {
return new Builder(name);
}
/**
* A builder object for {@link FieldProxy}.
*/
public static class Builder extends AbstractProxy.Builder<FieldProxy> {
/**
* The descriptor of the field's type.
*/
private String typeDescriptor;
/**
* The constructor of the builder, used only internally.
* @param name the name of the field
*/
Builder(String name) {
super(name);
}
/**
* Sets the descriptor of the field type to the given {@link String}.
* @param typeDescriptor the descriptor of the field type
* @return the builder's state after the change
*/
public Builder setDescriptor(String typeDescriptor) {
this.typeDescriptor = typeDescriptor;
return this;
}
/**
* Sets the descriptor of the field type to match the give {@link Class}.
* @param fqn the fully qualified name of the field type
* @param arrayLevel the array level of the field type
* @return the builder's state after the change
*/
public Builder setType(String fqn, int arrayLevel) {
this.typeDescriptor = DescriptorBuilder.nameToDescriptor(fqn, arrayLevel);
return this;
}
/**
* Sets the descriptor of the field type to match the give {@link Class}.
* @param type a {@link Class} object representing the field type
* @return the builder's state after the change
*/
public Builder setType(Class<?> type) {
this.typeDescriptor = Type.getDescriptor(type);
return this;
}
/**
* Builds a {@link FieldProxy} of the given kind.
* @return the built {@link FieldProxy}
*/
@Override
public FieldProxy build() {
return new FieldProxy(this.name, this.modifiers, this.parent, this.typeDescriptor);
}
}
}
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