content: /*
   * Copyright (C) 2014 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;
  import static com.android.internal.util.Preconditions.checkArgumentFinite;
  
  /**
   * Immutable class for describing width and height dimensions in some arbitrary
   * unit.
   * <p>
   * Width and height are finite values stored as a floating point representation.
   * </p>
   */
  public final class SizeF {
      /**
       * Create a new immutable SizeF instance.
       *
       * <p>Both the {@code width} and the {@code height} must be a finite number.
       * In particular, {@code NaN} and positive/negative infinity are illegal values.</p>
       *
       * @param width The width of the size
       * @param height The height of the size
       *
       * @throws IllegalArgumentException
       *             if either {@code width} or {@code height} was not finite.
       */
      public SizeF(final float width, final float height) {
          mWidth = checkArgumentFinite(width, "width");
          mHeight = checkArgumentFinite(height, "height");
      }
  
      /**
       * Get the width of the size (as an arbitrary unit).
       * @return width
       */
      public float getWidth() {
          return mWidth;
      }
  
      /**
       * Get the height of the size (as an arbitrary unit).
       * @return height
       */
      public float 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 the same.</p>
       *
       * <p>For this purpose, the width/height float values are considered to be the same if and only
       * if the method {@link Float#floatToIntBits(float)} returns the identical {@code int} value
       * when applied to each.</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 SizeF) {
              final SizeF other = (SizeF) 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 invalidSizeF(String s) {
          throw new NumberFormatException("Invalid SizeF: \"" + 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 SizeF s}: {@code SizeF.parseSizeF(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 SizeF(width, height)},
       * where <i>width</i> and <i>height</i> are string floats potentially
       * containing a sign, such as "-10.3", "+7" or "5.2", but not containing
       * an {@code 'x'} (such as a float in hexadecimal string format).</p>
       *
       * <pre>{@code
       * SizeF.parseSizeF("3.2*+6").equals(new SizeF(3.2f, 6.0f)) == true
       * SizeF.parseSizeF("-3x-6").equals(new SizeF(-3.0f, -6.0f)) == true
       * SizeF.parseSizeF("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 SizeF parseSizeF(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 invalidSizeF(string);
          }
          try {
              return new SizeF(Float.parseFloat(string.substring(0, sep_ix)),
                      Float.parseFloat(string.substring(sep_ix + 1)));
          } catch (NumberFormatException e) {
              throw invalidSizeF(string);
          } catch (IllegalArgumentException e) {
              throw invalidSizeF(string);
          }
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public int hashCode() {
          return Float.floatToIntBits(mWidth) ^ Float.floatToIntBits(mHeight);
      }
  
      private final float mWidth;
      private final float mHeight;
  }
  