/*
    * 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.
   */
  package org.apache.commons.functor.generator;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertSame;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.List;
  
  import org.apache.commons.functor.UnaryProcedure;
  import org.apache.commons.functor.generator.util.CollectionTransformer;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  /**
   * Tests the Base Generator class.
   * @author Jason Horman (jason@jhorman.org)
   */
  @SuppressWarnings("unchecked")
  public class TestBaseGenerator {
  
      private Generator simpleGenerator = null;
  
      // Lifecycle
      // ------------------------------------------------------------------------
  
      @Before
      public void setUp() throws Exception {
          simpleGenerator = new BaseGenerator() {
              public void run(UnaryProcedure proc) {
                  for (int i=0;i<5;i++) {
                      proc.run(new Integer(i));
                      if (isStopped()) {
                          break;
                      }
                  }
              }
          };
  
          list = new ArrayList();
          evens = new ArrayList();
          doubled = new ArrayList();
          listWithDuplicates = new ArrayList();
          sum = 0;
          for (int i=0;i<10;i++) {
              list.add(new Integer(i));
              doubled.add(new Integer(i*2));
              listWithDuplicates.add(new Integer(i));
              listWithDuplicates.add(new Integer(i));
              sum += i;
              if (i%2 == 0) {
                  evens.add(new Integer(i));
              }
          }
      }
  
      @After
      public void tearDown() throws Exception {
          simpleGenerator = null;
          list = null;
          evens = null;
          listWithDuplicates = null;
          sum = 0;
      }
  
      // Tests
      // ------------------------------------------------------------------------
  
      @Test
      public void testSimpleGenerator() {
          final StringBuffer result = new StringBuffer();
          simpleGenerator.run(new UnaryProcedure() {
              public void run(Object obj) {
                  result.append(obj);
              }
          });
  
          assertEquals("01234", result.toString());
      }
  
      @Test
     public void testStop() {
         final StringBuffer result = new StringBuffer();
         simpleGenerator.run(new UnaryProcedure() {
             int i=0;
             public void run(Object obj) {
                 result.append(obj);
                 if (i++ > 1) {
                     simpleGenerator.stop();
                 }
             }
         });
 
         assertEquals("012", result.toString());
     }
 
     @Test
     public void testWrappingGenerator() {
         final StringBuffer result = new StringBuffer();
         final Generator gen = new BaseGenerator(simpleGenerator) {
             public void run(final UnaryProcedure proc) {
                 Generator wrapped = getWrappedGenerator();
                 assertSame(simpleGenerator, wrapped);
                 wrapped.run(new UnaryProcedure() {
                     public void run(Object obj) {
                         proc.run(new Integer(((Integer) obj).intValue() + 1));
                     }
                 });
             }
         };
 
         gen.run(new UnaryProcedure() {
             public void run(Object obj) {
                 result.append(obj);
             }
         });
 
         assertEquals("12345", result.toString());
 
         // try to stop the wrapped generator
         final StringBuffer result2 = new StringBuffer();
         gen.run(new UnaryProcedure() {
             int i=0;
             public void run(Object obj) {
                 result2.append(obj);
                 if (i++ > 1) {
                     gen.stop();
                 }
             }
         });
 
         assertEquals("123", result2.toString());
     }
 
     // Tests
     // ------------------------------------------------------------------------
 
     @Test
     public void testTo() {
         Collection col = (Collection) simpleGenerator.to(new CollectionTransformer());
         assertEquals("[0, 1, 2, 3, 4]", col.toString());
 
         Collection fillThis = new LinkedList();
         col = (Collection) simpleGenerator.to(new CollectionTransformer(fillThis));
         assertSame(fillThis, col);
         assertEquals("[0, 1, 2, 3, 4]", col.toString());
 
         col = simpleGenerator.toCollection();
         assertEquals("[0, 1, 2, 3, 4]", col.toString());
         assertEquals("[0, 1, 2, 3, 4]", col.toString());
 
         fillThis = new LinkedList();
         col = simpleGenerator.to(fillThis);
         assertSame(fillThis, col);
         assertEquals("[0, 1, 2, 3, 4]", col.toString());
     }
 
     // Attributes
     // ------------------------------------------------------------------------
     private List list = null;
     private List doubled = null;
     private List evens = null;
     private List listWithDuplicates = null;
     private int sum = 0;
 //    private UnaryPredicate equalsThree = LeftBoundPredicate.bind(IsEqual.instance(),new Integer(3));
 //    private UnaryPredicate equalsTwentyThree = LeftBoundPredicate.bind(IsEqual.instance(),new Integer(23));
 //    private UnaryPredicate isEven = new UnaryPredicate() {
 //        public boolean test(Object obj) {
 //            return ((Number) obj).intValue() % 2 == 0;
 //        }
 //    };
 //    private UnaryPredicate isOdd = new UnaryPredicate() {
 //        public boolean test(Object obj) {
 //            return ((Number) obj).intValue() % 2 != 0;
 //        }
 //    };
 
     // Classes
     // ------------------------------------------------------------------------
 
     static class Summer implements UnaryProcedure {
         public void run(Object that) {
             sum += ((Number) that).intValue();
         }
         public int sum = 0;
     }
 }