content: /*
   * Copyright (C) 2015 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 androidx.test.espresso.intent;
  
  /** Substitute for Guava Preconditions to avoid dependency. */
  public final class Checks {
  
    private Checks() {}
  
    public static <T> T checkNotNull(T reference) {
      if (reference == null) {
        throw new NullPointerException();
      }
      return reference;
    }
  
    public static <T> T checkNotNull(T reference, Object errorMessage) {
      if (reference == null) {
        throw new NullPointerException(String.valueOf(errorMessage));
      }
      return reference;
    }
  
    public static <T> T checkNotNull(
        T reference, String errorMessageTemplate, Object... errorMessageArgs) {
      if (reference == null) {
        // If either of these parameters is null, the right thing happens anyway
        throw new NullPointerException(format(errorMessageTemplate, errorMessageArgs));
      }
      return reference;
    }
  
    public static void checkArgument(boolean expression) {
      if (!expression) {
        throw new IllegalArgumentException();
      }
    }
  
    public static void checkArgument(boolean expression, /* Nullable */ Object errorMessage) {
      if (!expression) {
        throw new IllegalArgumentException(String.valueOf(errorMessage));
      }
    }
  
    public static void checkArgument(
        boolean expression,
        /* Nullable */ String errorMessageTemplate,
        /* Nullable */ Object... errorMessageArgs) {
      if (!expression) {
        throw new IllegalArgumentException(format(errorMessageTemplate, errorMessageArgs));
      }
    }
  
    public static void checkState(boolean expression, /* Nullable */ Object errorMessage) {
      if (!expression) {
        throw new IllegalStateException(String.valueOf(errorMessage));
      }
    }
  
    public static void checkState(
        boolean expression,
        /* Nullable */ String errorMessageTemplate,
        /* Nullable */ Object... errorMessageArgs) {
      if (!expression) {
        throw new IllegalStateException(format(errorMessageTemplate, errorMessageArgs));
      }
    }
  
    private static String format(String template, Object... args) {
      template = String.valueOf(template); // null -> "null"
  
      // start substituting the arguments into the '%s' placeholders
      StringBuilder builder = new StringBuilder(template.length() + 16 * args.length);
      int templateStart = 0;
      int i = 0;
      while (i < args.length) {
        int placeholderStart = template.indexOf("%s", templateStart);
        if (placeholderStart == -1) {
          break;
        }
        builder.append(template.substring(templateStart, placeholderStart));
        builder.append(args[i++]);
        templateStart = placeholderStart + 2;
      }
      builder.append(template.substring(templateStart));
  
      // if we run out of placeholders, append the extra args in square braces
      if (i < args.length) {
        builder.append(" [");
        builder.append(args[i++]);
        while (i < args.length) {
          builder.append(", ");
          builder.append(args[i++]);
        }
        builder.append(']');
      }
  
      return builder.toString();
    }
  }
  