/*
 * Copyright (C) 2008 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.manifmerger;

import com.android.common.annotations.NonNull;
import com.android.common.utils.ILogger;

import java.util.ArrayList;
import java.util.Formatter;
import java.util.List;

/**
 * An instance of {@link ILogger} that captures all messages to an internal list.
 * Messages can be retrieved later using {@link #toString()}.
 * Useful for unit-tests.
 */
public class MockLog implements ILogger {
  private ArrayList<String> mMessages = new ArrayList<String>();

  private void add(String code, String format, Object... args) {
    Formatter formatter = new Formatter();
    mMessages.add(formatter.format(code + format, args).toString());
    formatter.close();
  }

  @Override
  public void warning(@NonNull String format, Object... args) {
    add("W ", format, args);
  }

  @Override
  public void info(@NonNull String format, Object... args) {
    add("P ", format, args);
  }

  @Override
  public void verbose(@NonNull String format, Object... args) {
    add("V ", format, args);
  }

  @Override
  public void error(Throwable t, String format, Object... args) {
    if (t != null) {
      add("T", "%s", t.toString());
    }
    add("E ", format, args);
  }

  @Override
  public String toString() {
    return mMessages.toString();
  }

  @NonNull
  public List<String> getMessages() {
    return mMessages;
  }

  public void clear() {
    mMessages.clear();
  }
}