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  /*
   * Copyright (C) 2010 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 com.actionbarsherlock.internal.nineoldandroids.animation;
 
 
This class holds a collection of Keyframe objects and is called by ValueAnimator to calculate values between those keyframes for a given animation. The class internal to the animation package because it is an implementation detail of how Keyframes are stored and used.
 
 @SuppressWarnings({"rawtypes""unchecked"})
 class KeyframeSet {
 
     int mNumKeyframes;
 
     /*Time*/Interpolator mInterpolator// only used in the 2-keyframe case
     ArrayList<KeyframemKeyframes// only used when there are not 2 keyframes
 
 
     public KeyframeSet(Keyframe... keyframes) {
          = keyframes.length;
          = new ArrayList<Keyframe>();
         .addAll(Arrays.asList(keyframes));
          = .get(0);
          = .get( - 1);
     }
 
     public static KeyframeSet ofInt(int... values) {
         int numKeyframes = values.length;
         IntKeyframe keyframes[] = new IntKeyframe[Math.max(numKeyframes,2)];
         if (numKeyframes == 1) {
             keyframes[0] = (IntKeyframe) Keyframe.ofInt(0f);
             keyframes[1] = (IntKeyframe) Keyframe.ofInt(1f, values[0]);
         } else {
             keyframes[0] = (IntKeyframe) Keyframe.ofInt(0f, values[0]);
             for (int i = 1; i < numKeyframes; ++i) {
                 keyframes[i] = (IntKeyframe) Keyframe.ofInt((floati / (numKeyframes - 1), values[i]);
             }
         }
         return new IntKeyframeSet(keyframes);
     }
 
     public static KeyframeSet ofFloat(float... values) {
         int numKeyframes = values.length;
         FloatKeyframe keyframes[] = new FloatKeyframe[Math.max(numKeyframes,2)];
         if (numKeyframes == 1) {
             keyframes[0] = (FloatKeyframe) Keyframe.ofFloat(0f);
             keyframes[1] = (FloatKeyframe) Keyframe.ofFloat(1f, values[0]);
         } else {
             keyframes[0] = (FloatKeyframe) Keyframe.ofFloat(0f, values[0]);
             for (int i = 1; i < numKeyframes; ++i) {
                 keyframes[i] = (FloatKeyframe) Keyframe.ofFloat((floati / (numKeyframes - 1), values[i]);
             }
         }
         return new FloatKeyframeSet(keyframes);
     }
 
     public static KeyframeSet ofKeyframe(Keyframe... keyframes) {
         // if all keyframes of same primitive type, create the appropriate KeyframeSet
         int numKeyframes = keyframes.length;
         boolean hasFloat = false;
         boolean hasInt = false;
         boolean hasOther = false;
         for (int i = 0; i < numKeyframes; ++i) {
             if (keyframes[iinstanceof FloatKeyframe) {
                 hasFloat = true;
             } else if (keyframes[iinstanceof IntKeyframe) {
                 hasInt = true;
             } else {
                 hasOther = true;
             }
         }
         if (hasFloat && !hasInt && !hasOther) {
             FloatKeyframe floatKeyframes[] = new FloatKeyframe[numKeyframes];
            for (int i = 0; i < numKeyframes; ++i) {
                floatKeyframes[i] = (FloatKeyframekeyframes[i];
            }
            return new FloatKeyframeSet(floatKeyframes);
        } else if (hasInt && !hasFloat && !hasOther) {
            IntKeyframe intKeyframes[] = new IntKeyframe[numKeyframes];
            for (int i = 0; i < numKeyframes; ++i) {
                intKeyframes[i] = (IntKeyframekeyframes[i];
            }
            return new IntKeyframeSet(intKeyframes);
        } else {
            return new KeyframeSet(keyframes);
        }
    }
    public static KeyframeSet ofObject(Object... values) {
        int numKeyframes = values.length;
        ObjectKeyframe keyframes[] = new ObjectKeyframe[Math.max(numKeyframes,2)];
        if (numKeyframes == 1) {
            keyframes[0] = (ObjectKeyframe) Keyframe.ofObject(0f);
            keyframes[1] = (ObjectKeyframe) Keyframe.ofObject(1f, values[0]);
        } else {
            keyframes[0] = (ObjectKeyframe) Keyframe.ofObject(0f, values[0]);
            for (int i = 1; i < numKeyframes; ++i) {
                keyframes[i] = (ObjectKeyframe) Keyframe.ofObject((floati / (numKeyframes - 1), values[i]);
            }
        }
        return new KeyframeSet(keyframes);
    }

    
Sets the TypeEvaluator to be used when calculating animated values. This object is required only for KeyframeSets that are not either IntKeyframeSet or FloatKeyframeSet, both of which assume their own evaluator to speed up calculations with those primitive types.

Parameters:
evaluator The TypeEvaluator to be used to calculate animated values.
    public void setEvaluator(TypeEvaluator evaluator) {
         = evaluator;
    }
    @Override
    public KeyframeSet clone() {
        ArrayList<Keyframekeyframes = ;
        int numKeyframes = .size();
        Keyframe[] newKeyframes = new Keyframe[numKeyframes];
        for (int i = 0; i < numKeyframes; ++i) {
            newKeyframes[i] = keyframes.get(i).clone();
        }
        KeyframeSet newSet = new KeyframeSet(newKeyframes);
        return newSet;
    }

    
Gets the animated value, given the elapsed fraction of the animation (interpolated by the animation's interpolator) and the evaluator used to calculate in-between values. This function maps the input fraction to the appropriate keyframe interval and a fraction between them and returns the interpolated value. Note that the input fraction may fall outside the [0-1] bounds, if the animation's interpolator made that happen (e.g., a spring interpolation that might send the fraction past 1.0). We handle this situation by just using the two keyframes at the appropriate end when the value is outside those bounds.

Parameters:
fraction The elapsed fraction of the animation
Returns:
The animated value.
    public Object getValue(float fraction) {
        // Special-case optimization for the common case of only two keyframes
        if ( == 2) {
            if ( != null) {
                fraction = .getInterpolation(fraction);
            }
            return .evaluate(fraction.getValue(),
                    .getValue());
        }
        if (fraction <= 0f) {
            final Keyframe nextKeyframe = .get(1);
            final /*Time*/Interpolator interpolator = nextKeyframe.getInterpolator();
            if (interpolator != null) {
                fraction = interpolator.getInterpolation(fraction);
            }
            final float prevFraction = .getFraction();
            float intervalFraction = (fraction - prevFraction) /
                (nextKeyframe.getFraction() - prevFraction);
            return .evaluate(intervalFraction.getValue(),
                    nextKeyframe.getValue());
        } else if (fraction >= 1f) {
            final Keyframe prevKeyframe = .get( - 2);
            final /*Time*/Interpolator interpolator = .getInterpolator();
            if (interpolator != null) {
                fraction = interpolator.getInterpolation(fraction);
            }
            final float prevFraction = prevKeyframe.getFraction();
            float intervalFraction = (fraction - prevFraction) /
                (.getFraction() - prevFraction);
            return .evaluate(intervalFractionprevKeyframe.getValue(),
                    .getValue());
        }
        Keyframe prevKeyframe = ;
        for (int i = 1; i < ; ++i) {
            Keyframe nextKeyframe = .get(i);
            if (fraction < nextKeyframe.getFraction()) {
                final /*Time*/Interpolator interpolator = nextKeyframe.getInterpolator();
                if (interpolator != null) {
                    fraction = interpolator.getInterpolation(fraction);
                }
                final float prevFraction = prevKeyframe.getFraction();
                float intervalFraction = (fraction - prevFraction) /
                    (nextKeyframe.getFraction() - prevFraction);
                return .evaluate(intervalFractionprevKeyframe.getValue(),
                        nextKeyframe.getValue());
            }
            prevKeyframe = nextKeyframe;
        }
        // shouldn't reach here
        return .getValue();
    }
    @Override
    public String toString() {
        String returnVal = " ";
        for (int i = 0; i < ; ++i) {
            returnVal += .get(i).getValue() + "  ";
        }
        return returnVal;
    }
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