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package com.google.inject.spi;

import com.google.inject.Binder;
import com.google.inject.ConfigurationException;

import java.util.Set;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * A request to inject the static fields and methods of a type. Requests are created
 * explicitly in a module using {@link com.google.inject.Binder#requestStaticInjection(Class[])
 * requestStaticInjection()} statements:
 *  *     requestStaticInjection(MyLegacyService.class);
 *
 */
public final class StaticInjectionRequest implements Element {
    private final Object source;
    private final Class type;

    StaticInjectionRequest(Object source, Class type) {
        this.source = checkNotNull(source, "source");
        this.type = checkNotNull(type, "type");
    }

    public Object getSource() {
        return source;
    }

    public Class getType() {
        return type;
    }

    /**
     * Returns the static methods and fields of {@code type} that will be injected to fulfill this
     * request.
     *
     * @return a possibly empty set of injection points. The set has a specified iteration order. All
     * fields are returned and then all methods. Within the fields, supertype fields are returned
     * before subtype fields. Similarly, supertype methods are returned before subtype methods.
     * @throws ConfigurationException if there is a malformed injection point on {@code type}, such as
     *                                a field with multiple binding annotations. The exception's {@link
     *                                ConfigurationException#getPartialValue() partial value} is a {@code
     *                                Set}
     *                                of the valid injection points.
     */
    public Set getInjectionPoints() throws ConfigurationException {
        return InjectionPoint.forStaticMethodsAndFields(type);
    }

    public void applyTo(Binder binder) {
        binder.withSource(getSource()).requestStaticInjection(type);
    }

    public  T acceptVisitor(ElementVisitor visitor) {
        return visitor.visit(this);
    }
}