001    /*
002     * Copyright 2010-2013 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package jet;
018    
019    import org.jetbrains.jet.rt.annotation.AssertInvisibleInResolver;
020    
021    @AssertInvisibleInResolver
022    public class FloatProgression implements Progression<Float> {
023        private final float start;
024        private final float end;
025        private final float increment;
026    
027        public FloatProgression(float start, float end, float increment) {
028            if (Float.isNaN(increment)) {
029                throw new IllegalArgumentException("Increment must be not NaN");
030            }
031            if (increment == 0.0f || increment == -0.0f) {
032                throw new IllegalArgumentException("Increment must be non-zero: " + increment);
033            }
034            this.start = start;
035            this.end = end;
036            this.increment = increment;
037        }
038    
039        @Override
040        public Float getStart() {
041            return start;
042        }
043    
044        @Override
045        public Float getEnd() {
046            return end;
047        }
048    
049        @Override
050        public Float getIncrement() {
051            return increment;
052        }
053    
054        @Override
055        public FloatIterator iterator() {
056            return new FloatProgressionIterator(start, end, increment);
057        }
058    
059        @Override
060        public String toString() {
061            if (increment > 0) {
062                return start + ".." + end + " step " + increment;
063            }
064            else {
065                return start + " downTo " + end + " step " + -increment;
066            }
067        }
068    
069        @Override
070        public boolean equals(Object o) {
071            if (this == o) return true;
072            if (o == null || getClass() != o.getClass()) return false;
073    
074            FloatProgression floats = (FloatProgression) o;
075    
076            if (Float.compare(floats.end, end) != 0) return false;
077            if (Float.compare(floats.increment, increment) != 0) return false;
078            if (Float.compare(floats.start, start) != 0) return false;
079    
080            return true;
081        }
082    
083        @Override
084        public int hashCode() {
085            int result = (start != +0.0f ? Float.floatToIntBits(start) : 0);
086            result = 31 * result + (end != +0.0f ? Float.floatToIntBits(end) : 0);
087            result = 31 * result + (increment != +0.0f ? Float.floatToIntBits(increment) : 0);
088            return result;
089        }
090    }