com.google.inject.assistedinject.BindingCollector.java Source code

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Here is the source code for com.google.inject.assistedinject.BindingCollector.java

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/**
 * Copyright (C) 2009 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
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}.
 *
 * @author schmitt@google.com (Peter Schmitt)
 */
class BindingCollector {

    private final Map<Key<?>, 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<Key<?>, 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);
    }
}