/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * 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.android.tools.build.apkzlib.zip;

import com.google.common.collect.ImmutableList;
import java.util.ArrayList;
import java.util.List;

/** Factory for verification logs. */
final class VerifyLogs {

  private VerifyLogs() {}

  /**
   * Creates a {@link VerifyLog} that ignores all messages logged.
   *
   * @return the log
   */
  static VerifyLog devNull() {
    return new VerifyLog() {
      @Override
      public void log(String message) {}

      @Override
      public ImmutableList<String> getLogs() {
        return ImmutableList.of();
      }
    };
  }

  /**
   * Creates a {@link VerifyLog} that stores all log messages.
   *
   * @return the log
   */
  static VerifyLog unlimited() {
    return new VerifyLog() {

      /** All saved messages. */
      private final List<String> messages = new ArrayList<>();

      @Override
      public void log(String message) {
        messages.add(message);
      }

      @Override
      public ImmutableList<String> getLogs() {
        return ImmutableList.copyOf(messages);
      }
    };
  }
}