| /* |
| * 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; |
| } |