// Path: src/main/java/be/fror/common/base/Preconditions.java
// public static <T> T checkArgument(@Nullable T value, Predicate<? super T> predicate) {
//   if (predicate.test(value)) {
//     return value;
//   } else {
//     throw new IllegalArgumentException();
//   }
// }
// 
// Path: src/main/java/be/fror/common/base/Preconditions.java
// public static <T> T checkNotNull(@Nullable T reference) {
//   if (reference != null) {
//     return reference;
//   } else {
//     throw new NullPointerException();
//   }
// }


import static be.fror.common.base.Preconditions.checkArgument;
import static be.fror.common.base.Preconditions.checkNotNull;
import java.text.Normalizer;
import java.util.regex.Pattern;
import javax.annotation.Nullable;
/*
 * Copyright 2015 Olivier Grégoire.
 *
 * 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 be.fror.common.base;




/**
 * Tools for String that are not present in Guava.
 *
 * @author Olivier Grégoire
 */
public final class Strings {

  private Strings() {
  }

  public static String nullToEmpty(@Nullable String string) {
    return string == null ? "" : string;
  }

  @Nullable
  public static String emptyToNull(@Nullable String string) {
    return isNullOrEmpty(string) ? null : string;
  }

  public static boolean isNullOrEmpty(@Nullable String string) {
    return string == null || string.isEmpty();
  }

  public static String repeat(String string, int count) {
    checkNotNull(string);
    if (count <= 1) {
// Path: src/main/java/be/fror/common/base/Preconditions.java
// public static <T> T checkArgument(@Nullable T value, Predicate<? super T> predicate) {
//   if (predicate.test(value)) {
//     return value;
//   } else {
//     throw new IllegalArgumentException();
//   }
// }
// 
// Path: src/main/java/be/fror/common/base/Preconditions.java
// public static <T> T checkNotNull(@Nullable T reference) {
//   if (reference != null) {
//     return reference;
//   } else {
//     throw new NullPointerException();
//   }
// }


// Path: src/main/java/be/fror/common/base/Strings.java
import static be.fror.common.base.Preconditions.checkArgument;
import static be.fror.common.base.Preconditions.checkNotNull;
import java.text.Normalizer;
import java.util.regex.Pattern;
import javax.annotation.Nullable;

/*
 * Copyright 2015 Olivier Grégoire.
 *
 * 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 be.fror.common.base;




/**
 * Tools for String that are not present in Guava.
 *
 * @author Olivier Grégoire
 */
public final class Strings {

  private Strings() {
  }

  public static String nullToEmpty(@Nullable String string) {
    return string == null ? "" : string;
  }

  @Nullable
  public static String emptyToNull(@Nullable String string) {
    return isNullOrEmpty(string) ? null : string;
  }

  public static boolean isNullOrEmpty(@Nullable String string) {
    return string == null || string.isEmpty();
  }

  public static String repeat(String string, int count) {
    checkNotNull(string);
    if (count <= 1) {
      checkArgument(count >= 0, "Invalid count: %s", count);