BindingCollector.java

/*
 * Copyright 2010 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.gwt.inject.client.assistedinject;

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.LinkedHashMap;
import java.util.Map;

/**
 * Modified copy from
 * {@link com.google.inject.assistedinject.BindingCollector}.
 */
class BindingCollector {

  private final Map<Key<?>, TypeLiteral<?>> bindings =
      new LinkedHashMap<Key<?>, TypeLiteral<?>>();

  public BindingCollector addBinding(Key<?> key, TypeLiteral<?> target) {
    if (bindings.containsKey(key)) {
      throw new ConfigurationException(Collections.singleton(
          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);
  }
}