content: /*
   * Copyright (C) 2018 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.graphics.text;
  
  import android.annotation.NonNull;
  
  // Based on the native implementation of Primitive in
  // frameworks/base/core/jni/android_text_StaticLayout.cpp revision b808260
  public class Primitive {
      public final @NonNull PrimitiveType type;
      public final int location;
      // The following fields don't make sense for all types.
      // Box and Glue have width only.
      // Penalty has both width and penalty.
      // Word_break has penalty only.
      public final float width;
      public final float penalty;
  
      /**
       * Use {@code PrimitiveType#getNewPrimitive()}
       */
      private Primitive(@NonNull PrimitiveType type, int location, float width, float penalty) {
          this.type = type;
          this.location = location;
          this.width = width;
          this.penalty = penalty;
      }
  
      public static enum PrimitiveType {
          /**
           * Something with a constant width that is to be typeset - like a character.
           */
          BOX,
          /**
           * Blank space with fixed width.
           */
          GLUE,
          /**
           * Aesthetic cost indicating how desirable breaking at this point will be. A penalty of
           * {@link #PENALTY_INFINITY} means a forced non-break, whereas a penalty of negative
           * {@code #PENALTY_INFINITY} means a forced break.
           * <p/>
           * Currently, it only stores penalty with values 0 or -infinity.
           */
          PENALTY,
          /**
           * For tabs - variable width space.
           */
          VARIABLE,
          /**
           * Possible breakpoints within a word. Think of this as a high cost {@link #PENALTY}.
           */
          WORD_BREAK;
  
          public Primitive getNewPrimitive(int location) {
              assert this == VARIABLE;
              return new Primitive(this, location, 0f, 0f);
          }
  
          public Primitive getNewPrimitive(int location, float value) {
              assert this == BOX || this == GLUE || this == WORD_BREAK;
              if (this == BOX || this == GLUE) {
                  return new Primitive(this, location, value, 0f);
              } else {
                  return new Primitive(this, location, 0f, value);
              }
          }
  
          public Primitive getNewPrimitive(int location, float width, float penalty) {
              assert this == PENALTY;
              return new Primitive(this, location, width, penalty);
          }
  
          // forced non-break, negative infinity is forced break.
          public static final float PENALTY_INFINITY = 1e7f;
      }
  }
  
  