/*
* Copyright 2014 Goldman Sachs.
*
* 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.gs.collections.impl.utility;
import com.gs.collections.api.LazyIterable;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.list.ImmutableList;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.impl.block.factory.Predicates;
import com.gs.collections.impl.block.factory.Procedures;
import com.gs.collections.impl.block.function.AddFunction;
import com.gs.collections.impl.list.Interval;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.math.IntegerSum;
import com.gs.collections.impl.math.Sum;
import com.gs.collections.impl.test.Verify;
import org.junit.Assert;
import org.junit.Test;
public class LazyIterateTest
{
@Test
public void selectForEach()
{
LazyIterable<Integer> select = LazyIterate.select(Interval.oneTo(5), Predicates.lessThan(5));
int sum = select.injectInto(0, AddFunction.INTEGER_TO_INT);
Assert.assertEquals(10, sum);
}
@Test
public void selectForEachWithIndex()
{
LazyIterable<Integer> select = LazyIterate.select(Interval.oneTo(5), Predicates.lessThan(5));
Sum sum = new IntegerSum(0);
select.forEachWithIndex((object, index) -> {
sum.add(object);
sum.add(index);
});
Assert.assertEquals(16, sum.getValue().intValue());
}
@Test
public void selectIterator()
{
LazyIterable<Integer> select = LazyIterate.select(Interval.oneTo(5), Predicates.lessThan(5));
Sum sum = new IntegerSum(0);
for (Integer each : select)
{
sum.add(each);
}
Assert.assertEquals(10, sum.getValue().intValue());
}
@Test
public void selectForEachWith()
{
LazyIterable<Integer> select = LazyIterate.select(Interval.oneTo(5), Predicates.lessThan(5));
Sum sum = new IntegerSum(0);
select.forEachWith((each, aSum) -> aSum.add(each), sum);
Assert.assertEquals(10, sum.getValue().intValue());
}
@Test
public void rejectForEach()
{
LazyIterable<Integer> select = LazyIterate.reject(Interval.oneTo(5), Predicates.lessThan(5));
int sum = select.injectInto(0, AddFunction.INTEGER_TO_INT);
Assert.assertEquals(5, sum);
}
@Test
public void rejectForEachWithIndex()
{
LazyIterable<Integer> select = LazyIterate.reject(Interval.oneTo(5), Predicates.lessThan(5));
Sum sum = new IntegerSum(0);
select.forEachWithIndex((object, index) -> {
sum.add(object);
sum.add(index);
});
Assert.assertEquals(5, sum.getValue().intValue());
}
@Test
public void rejectIterator()
{
LazyIterable<Integer> select = LazyIterate.reject(Interval.oneTo(5), Predicates.lessThan(5));
Sum sum = new IntegerSum(0);
for (Integer each : select)
{
sum.add(each);
}
Assert.assertEquals(5, sum.getValue().intValue());
}
@Test
public void rejectForEachWith()
{
LazyIterable<Integer> select = LazyIterate.reject(Interval.oneTo(5), Predicates.lessThan(5));
Sum sum = new IntegerSum(0);
select.forEachWith((each, aSum) -> aSum.add(each), sum);
Assert.assertEquals(5, sum.getValue().intValue());
}
@Test
public void collectForEach()
{
LazyIterable<String> select = LazyIterate.collect(Interval.oneTo(5), String::valueOf);
Appendable builder = new StringBuilder();
Procedure<String> appendProcedure = Procedures.append(builder);
select.forEach(appendProcedure);
Assert.assertEquals("12345", builder.toString());
}
@Test
public void collectForEachWithIndex()
{
LazyIterable<String> select = LazyIterate.collect(Interval.oneTo(5), String::valueOf);
StringBuilder builder = new StringBuilder("");
select.forEachWithIndex((object, index) -> {
builder.append(object);
builder.append(index);
});
Assert.assertEquals("1021324354", builder.toString());
}
@Test
public void collectIterator()
{
LazyIterable<String> select = LazyIterate.collect(Interval.oneTo(5), String::valueOf);
StringBuilder builder = new StringBuilder("");
for (String each : select)
{
builder.append(each);
}
Assert.assertEquals("12345", builder.toString());
}
@Test
public void collectForEachWith()
{
LazyIterable<String> select = LazyIterate.collect(Interval.oneTo(5), String::valueOf);
StringBuilder builder = new StringBuilder("");
select.forEachWith((each, aBuilder) -> aBuilder.append(each), builder);
Assert.assertEquals("12345", builder.toString());
}
@Test
public void asDeferred()
{
MutableList<Integer> expected = FastList.newList(Interval.oneTo(5));
MutableList<Integer> actual0 = LazyIterate.adapt(Interval.oneTo(5)).toList();
MutableList<Integer> actual1 = Interval.oneTo(5).asLazy().toList();
MutableList<Integer> actual2 = FastList.newList(Interval.oneTo(5)).asLazy().toList();
MutableList<Integer> actual3 = actual2.asUnmodifiable().asLazy().toList();
MutableList<Integer> actual4 = actual2.asSynchronized().asLazy().toList();
MutableList<Integer> actual5 = actual2.asLazy().select(ignored -> true).toList();
MutableList<Integer> actual6 = actual2.toImmutable().asLazy().toList();
ImmutableList<Integer> actual7 = actual2.asLazy().toList().toImmutable();
Assert.assertEquals(expected, actual0);
Assert.assertEquals(expected, actual1);
Assert.assertEquals(expected, actual2);
Assert.assertEquals(expected, actual3);
Assert.assertEquals(expected, actual4);
Assert.assertEquals(expected, actual5);
Assert.assertEquals(expected, actual6);
Assert.assertEquals(expected, actual7);
}
@Test
public void classIsNonInstantiable()
{
Verify.assertClassNonInstantiable(LazyIterate.class);
}
}