content: /*
   * Copyright (C) 2013 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 android.util;
  
  import static com.android.internal.util.Preconditions.checkNotNull;
  
  /**
   * Immutable class for describing width and height dimensions in pixels.
   */
  public final class Size {
      /**
       * Create a new immutable Size instance.
       *
       * @param width The width of the size, in pixels
       * @param height The height of the size, in pixels
       */
      public Size(int width, int height) {
          mWidth = width;
          mHeight = height;
      }
  
      /**
       * Get the width of the size (in pixels).
       * @return width
       */
      public int getWidth() {
          return mWidth;
      }
  
      /**
       * Get the height of the size (in pixels).
       * @return height
       */
      public int getHeight() {
          return mHeight;
      }
  
      /**
       * Check if this size is equal to another size.
       * <p>
       * Two sizes are equal if and only if both their widths and heights are
       * equal.
       * </p>
       * <p>
       * A size object is never equal to any other type of object.
       * </p>
       *
       * @return {@code true} if the objects were equal, {@code false} otherwise
       */
      @Override
      public boolean equals(final Object obj) {
          if (obj == null) {
              return false;
          }
          if (this == obj) {
              return true;
          }
          if (obj instanceof Size) {
              Size other = (Size) obj;
              return mWidth == other.mWidth && mHeight == other.mHeight;
          }
          return false;
      }
  
      /**
       * Return the size represented as a string with the format {@code "WxH"}
       *
       * @return string representation of the size
       */
      @Override
      public String toString() {
          return mWidth + "x" + mHeight;
      }
  
      private static NumberFormatException invalidSize(String s) {
          throw new NumberFormatException("Invalid Size: \"" + s + "\"");
      }
  
      /**
       * Parses the specified string as a size value.
       * <p>
       * The ASCII characters {@code \}{@code u002a} ('*') and
       * {@code \}{@code u0078} ('x') are recognized as separators between
       * the width and height.</p>
       * <p>
       * For any {@code Size s}: {@code Size.parseSize(s.toString()).equals(s)}.
       * However, the method also handles sizes expressed in the
       * following forms:</p>
       * <p>
       * "<i>width</i>{@code x}<i>height</i>" or
       * "<i>width</i>{@code *}<i>height</i>" {@code => new Size(width, height)},
       * where <i>width</i> and <i>height</i> are string integers potentially
       * containing a sign, such as "-10", "+7" or "5".</p>
       *
       * <pre>{@code
       * Size.parseSize("3*+6").equals(new Size(3, 6)) == true
       * Size.parseSize("-3x-6").equals(new Size(-3, -6)) == true
       * Size.parseSize("4 by 3") => throws NumberFormatException
       * }</pre>
       *
       * @param string the string representation of a size value.
       * @return the size value represented by {@code string}.
       *
       * @throws NumberFormatException if {@code string} cannot be parsed
       * as a size value.
       * @throws NullPointerException if {@code string} was {@code null}
       */
      public static Size parseSize(String string)
              throws NumberFormatException {
          checkNotNull(string, "string must not be null");
  
          int sep_ix = string.indexOf('*');
          if (sep_ix < 0) {
              sep_ix = string.indexOf('x');
          }
          if (sep_ix < 0) {
              throw invalidSize(string);
          }
          try {
              return new Size(Integer.parseInt(string.substring(0, sep_ix)),
                      Integer.parseInt(string.substring(sep_ix + 1)));
          } catch (NumberFormatException e) {
              throw invalidSize(string);
          }
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public int hashCode() {
          // assuming most sizes are <2^16, doing a rotate will give us perfect hashing
          return mHeight ^ ((mWidth << (Integer.SIZE / 2)) | (mWidth >>> (Integer.SIZE / 2)));
      }
  
      private final int mWidth;
      private final int mHeight;
  }
  