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Object mapper for the CQL Java Driver.

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/*
 * Copyright DataStax, 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.datastax.driver.mapping;

import com.datastax.driver.core.PreparedStatement;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.List;

class AccessorMapper {

  final Class daoClass;
  final List methods;
  private final Class[] proxyClasses;
  private final AccessorInvocationHandler handler;

  @SuppressWarnings({"unchecked", "rawtypes"})
  AccessorMapper(Class daoClass, List methods) {
    this.daoClass = daoClass;
    this.methods = methods;
    this.proxyClasses = (Class[]) new Class[] {daoClass};
    this.handler = new AccessorInvocationHandler(this);
  }

  @SuppressWarnings("unchecked")
  T createProxy() {
    try {
      return (T) Proxy.newProxyInstance(daoClass.getClassLoader(), proxyClasses, handler);
    } catch (Exception e) {
      throw new RuntimeException(
          "Cannot create instance for Accessor interface " + daoClass.getName());
    }
  }

  void prepare(MappingManager manager) {
    List> statements =
        new ArrayList>(methods.size());

    for (MethodMapper method : methods)
      statements.add(manager.getSession().prepareAsync(method.queryString));

    try {
      List preparedStatements = Futures.allAsList(statements).get();
      for (int i = 0; i < methods.size(); i++)
        methods.get(i).prepare(manager, preparedStatements.get(i));
    } catch (Exception e) {
      throw new RuntimeException(
          "Error preparing queries for accessor " + daoClass.getSimpleName(), e);
    }
  }
}