package org.apache.lucene.search.function;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

import org.apache.lucene.util.LuceneTestCase;

/**
 * DocValues TestCase  
 */
public class TestDocValues extends LuceneTestCase {

  /* @override constructor */
  public TestDocValues(String name) {
    super(name);
  }

  /* @override */
  protected void tearDown() throws Exception {
    super.tearDown();
  }

  /* @override */
  protected void setUp() throws Exception {
    // prepare a small index with just a few documents.
    super.setUp();
  }

  public void testGetMinValue() {
    float[] innerArray = new float[] { 1.0f, 2.0f, -1.0f, 100.0f };
    DocValuesTestImpl docValues = new DocValuesTestImpl(innerArray);
    assertEquals("-1.0f is the min value in the source array", -1.0f, docValues
        .getMinValue());

    // test with without values - NaN
    innerArray = new float[] {};
    docValues = new DocValuesTestImpl(innerArray);
    assertTrue("max is NaN - no values in inner array", Float.isNaN(docValues
        .getMinValue()));
  }

  public void testGetMaxValue() {
    float[] innerArray = new float[] { 1.0f, 2.0f, -1.0f, 10.0f };
    DocValuesTestImpl docValues = new DocValuesTestImpl(innerArray);
    assertEquals("10.0f is the max value in the source array", 10.0f, docValues
        .getMaxValue());

    innerArray = new float[] { -3.0f, -1.0f, -100.0f };
    docValues = new DocValuesTestImpl(innerArray);
    assertEquals("-1.0f is the max value in the source array", -1.0f, docValues
        .getMaxValue());

    innerArray = new float[] { -3.0f, -1.0f, 100.0f, Float.MAX_VALUE,
        Float.MAX_VALUE - 1 };
    docValues = new DocValuesTestImpl(innerArray);
    assertEquals(Float.MAX_VALUE + " is the max value in the source array",
        Float.MAX_VALUE, docValues.getMaxValue());

    // test with without values - NaN
    innerArray = new float[] {};
    docValues = new DocValuesTestImpl(innerArray);
    assertTrue("max is NaN - no values in inner array", Float.isNaN(docValues
        .getMaxValue()));
  }

  public void testGetAverageValue() {
    float[] innerArray = new float[] { 1.0f, 1.0f, 1.0f, 1.0f };
    DocValuesTestImpl docValues = new DocValuesTestImpl(innerArray);
    assertEquals("the average is 1.0f", 1.0f, docValues.getAverageValue());

    innerArray = new float[] { 1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f };
    docValues = new DocValuesTestImpl(innerArray);
    assertEquals("the average is 3.5f", 3.5f, docValues.getAverageValue());

    // test with negative values
    innerArray = new float[] { -1.0f, 2.0f };
    docValues = new DocValuesTestImpl(innerArray);
    assertEquals("the average is 0.5f", 0.5f, docValues.getAverageValue());

    // test with without values - NaN
    innerArray = new float[] {};
    docValues = new DocValuesTestImpl(innerArray);
    assertTrue("the average is NaN - no values in inner array", Float
        .isNaN(docValues.getAverageValue()));
  }

  static class DocValuesTestImpl extends DocValues {
    float[] innerArray;

    DocValuesTestImpl(float[] innerArray) {
      this.innerArray = innerArray;
    }

    /**
     * @see org.apache.lucene.search.function.DocValues#floatVal(int)
     */
    /* @Override */
    public float floatVal(int doc) {
      return innerArray[doc];
    }

    /**
     * @see org.apache.lucene.search.function.DocValues#toString(int)
     */
    /* @Override */
    public String toString(int doc) {
      return Integer.toString(doc);
    }

  }

}
@@ -886,16 +886,47 @@
 estCase;
+%0Aimport junit.framework.Assert;
 %0A%0A/**%0A *
@@ -1597,24 +1597,27 @@
 etMinValue()
+, 0
 );%0A%0A    // t
@@ -2103,32 +2103,35 @@
   .getMaxValue()
+, 0
 );%0A%0A    innerArr
@@ -2319,32 +2319,35 @@
   .getMaxValue()
+, 0
 );%0A%0A    innerArr
@@ -2606,24 +2606,27 @@
 etMaxValue()
+, 0
 );%0A%0A    // t
@@ -3085,32 +3085,35 @@
 etAverageValue()
+, 0
 );%0A%0A    innerArr
@@ -3285,32 +3285,35 @@
 etAverageValue()
+, 0
 );%0A%0A    // test 
@@ -3422,32 +3422,32 @@
 pl(innerArray);%0A
-
     assertEquals
@@ -3503,16 +3503,19 @@
 eValue()
+, 0
 );%0A%0A    

add delta param to TestDocValues assertEqueals(string,float,float) calls