Colors.java example

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assertj-swing-master
/**
 * 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.
 *
 * Copyright 2012-2015 the original author or authors.
 */
package org.assertj.swing.util;

import static org.assertj.core.util.Preconditions.checkNotNullOrEmpty;
import static org.assertj.core.util.Strings.concat;
import static org.assertj.core.util.Strings.quote;

import java.awt.Color;

import javax.annotation.Nonnull;

/**
 * Utility methods related to colors.
 * 
 * @author Alex Ruiz
 */
public final class Colors {
  /**
   * Returns a {@code Color} from the given {@code String} containing the hexadecimal coding of a color.
   * 
   * @param hexString contains the hexadecimal coding of a color.
   * @return a {@code Color} from the given {@code String} containing the hexadecimal coding of a color.
   * @throws NullPointerException if the hexadecimal code is {@code null}.
   * @throws IllegalArgumentException if the hexadecimal code is empty.
   * @throws NumberFormatException if the hexadecimal code is empty.
   */
  public static @Nonnull Color colorFromHexString(@Nonnull String hexString) {
    checkNotNullOrEmpty(hexString);
    try {
      return new Color(Integer.parseInt(hexString, 16));
    } catch (NumberFormatException e) {
      throw new NumberFormatException(concat("The hexadecimal code ", quote(hexString), " is not a valid color code"));
    }
  }

  private Colors() {
  }
}