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package com.google.inject.assistedinject;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import com.google.inject.ConfigurationException;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import com.google.inject.spi.Message;

import java.util.Collections;
import java.util.Map;

/**
 * Utility class for collecting factory bindings. Used for configuring {@link FactoryProvider2}.
 */
class BindingCollector {

    private final Map, TypeLiteral> bindings = Maps.newHashMap();

    public BindingCollector addBinding(Key key, TypeLiteral target) {
        if (bindings.containsKey(key)) {
            throw new ConfigurationException(ImmutableSet.of(
                    new Message("Only one implementation can be specified for " + key)));
        }

        bindings.put(key, target);

        return this;
    }

    public Map, TypeLiteral> getBindings() {
        return Collections.unmodifiableMap(bindings);
    }

    @Override
    public int hashCode() {
        return bindings.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        return (obj instanceof BindingCollector) && bindings.equals(((BindingCollector) obj).bindings);
    }
}