com.google.inject.internal.InstanceBindingImpl Maven / Gradle / Ivy

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package com.google.inject.internal;

import com.google.common.base.MoreObjects;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableSet;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.spi.BindingTargetVisitor;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.HasDependencies;
import com.google.inject.spi.InjectionPoint;
import com.google.inject.spi.InstanceBinding;

import java.util.Set;

final class InstanceBindingImpl extends BindingImpl implements InstanceBinding {

    final T instance;
    final ImmutableSet injectionPoints;

    public InstanceBindingImpl(InjectorImpl injector, Key key, Object source,
                               InternalFactory internalFactory, Set injectionPoints,
                               T instance) {
        super(injector, key, source, internalFactory, Scoping.EAGER_SINGLETON);
        this.injectionPoints = ImmutableSet.copyOf(injectionPoints);
        this.instance = instance;
    }

    public InstanceBindingImpl(Object source, Key key, Scoping scoping,
                               Set injectionPoints, T instance) {
        super(source, key, scoping);
        this.injectionPoints = ImmutableSet.copyOf(injectionPoints);
        this.instance = instance;
    }

    @Override
    public  V acceptTargetVisitor(BindingTargetVisitor visitor) {
        return visitor.visit(this);
    }

    @Override
    public T getInstance() {
        return instance;
    }

    @Override
    public Set getInjectionPoints() {
        return injectionPoints;
    }

    @Override
    public Set> getDependencies() {
        return instance instanceof HasDependencies
                ? ImmutableSet.copyOf(((HasDependencies) instance).getDependencies())
                : Dependency.forInjectionPoints(injectionPoints);
    }

    @Override
    public BindingImpl withScoping(Scoping scoping) {
        return new InstanceBindingImpl(getSource(), getKey(), scoping, injectionPoints, instance);
    }

    @Override
    public BindingImpl withKey(Key key) {
        return new InstanceBindingImpl(getSource(), key, getScoping(), injectionPoints, instance);
    }

    @Override
    public void applyTo(Binder binder) {
        // instance bindings aren't scoped
        binder.withSource(getSource()).bind(getKey()).toInstance(instance);
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(InstanceBinding.class)
                .add("key", getKey())
                .add("source", getSource())
                .add("instance", instance)
                .toString();
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof InstanceBindingImpl) {
            InstanceBindingImpl o = (InstanceBindingImpl) obj;
            return getKey().equals(o.getKey())
                    && getScoping().equals(o.getScoping())
                    && Objects.equal(instance, o.instance);
        } else {
            return false;
        }
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(getKey(), getScoping());
    }
}