code: /*
   * 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.datasketches.memory.internal;
  
  import static org.testng.Assert.assertEquals;
  import static org.testng.Assert.fail;
  
  import org.apache.datasketches.memory.Memory;
  import org.apache.datasketches.memory.MemoryBoundsException;
  import org.apache.datasketches.memory.WritableMemory;
  import org.testng.annotations.Test;
  
  /**
   * @author Lee Rhodes
   */
  public class WritableDirectCopyTest {
  
  //Copy Within tests
  
    @Test
    public void checkCopyWithinNativeSmall() {
      int memCapacity = 64;
      int half = memCapacity / 2;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        mem.clear();
  
        for (int i = 0; i < half; i++) { //fill first half
          mem.putByte(i, (byte) i);
        }
  
        mem.copyTo(0, mem, half, half);
  
        for (int i = 0; i < half; i++) {
          assertEquals(mem.getByte(i + half), (byte) i);
        }
      }
    }
  
    @Test
    public void checkCopyWithinNativeLarge() {
      int memCapacity = (2 << 20) + 64;
      int memCapLongs = memCapacity / 8;
      int halfBytes = memCapacity / 2;
      int halfLongs = memCapLongs / 2;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        mem.clear();
  
        for (int i = 0; i < halfLongs; i++) {
          mem.putLong(i * 8, i);
        }
  
        mem.copyTo(0, mem, halfBytes, halfBytes);
  
        for (int i = 0; i < halfLongs; i++) {
          assertEquals(mem.getLong((i + halfLongs) * 8), i);
        }
      }
    }
  
    @Test
    public void checkCopyWithinNativeOverlap() {
      int memCapacity = 64;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        mem.clear();
        //println(mem.toHexString("Clear 64", 0, memCapacity));
  
        for (int i = 0; i < (memCapacity / 2); i++) {
          mem.putByte(i, (byte) i);
        }
        //println(mem.toHexString("Set 1st 32 to ints ", 0, memCapacity));
        mem.copyTo(0, mem, memCapacity / 4, memCapacity / 2);  //overlap is OK
      }
    }
  
    @Test
    public void checkCopyWithinNativeSrcBound() {
      int memCapacity = 64;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        mem.copyTo(32, mem, 32, 33);  //hit source bound check
        fail("Did Not Catch Assertion Error: source bound");
      } catch (MemoryBoundsException e) {
        //pass
      }
    }
  
    @Test
    public void checkCopyWithinNativeDstBound() {
      int memCapacity = 64;
      try (WritableMemory mem = WritableMemory.allocateDirect(memCapacity)) {
        mem.copyTo(0, mem, 32, 33);  //hit dst bound check
        fail("Did Not Catch Assertion Error: dst bound");
      } catch (MemoryBoundsException e) {
        //pass
      }
    }
  
    @Test
    public void checkCopyCrossNativeSmall() {
      int memCapacity = 64;
  
      try (WritableMemory mem1 = WritableMemory.allocateDirect(memCapacity);
          WritableMemory mem2 = WritableMemory.allocateDirect(memCapacity)) {
  
        for (int i = 0; i < memCapacity; i++) {
          mem1.putByte(i, (byte) i);
        }
        mem2.clear();
        mem1.copyTo(0, mem2, 0, memCapacity);
  
        for (int i = 0; i < memCapacity; i++) {
          assertEquals(mem2.getByte(i), (byte) i);
        }
      }
    }
  
    @Test
    public void checkCopyCrossNativeLarge() {
      int memCapacity = (2 << 20) + 64;
      int memCapLongs = memCapacity / 8;
  
      try (WritableMemory mem1 = WritableMemory.allocateDirect(memCapacity);
           WritableMemory mem2 = WritableMemory.allocateDirect(memCapacity)) {
        for (int i = 0; i < memCapLongs; i++) {
          mem1.putLong(i * 8, i);
        }
        mem2.clear();
  
        mem1.copyTo(0, mem2, 0, memCapacity);
  
        for (int i = 0; i < memCapLongs; i++) {
          assertEquals(mem2.getLong(i * 8), i);
        }
      }
    }
  
    @Test
    public void checkCopyCrossNativeAndByteArray() {
      int memCapacity = 64;
      try (WritableMemory mem1 = WritableMemory.allocateDirect(memCapacity)) {
        for (int i = 0; i < mem1.getCapacity(); i++) {
          mem1.putByte(i, (byte) i);
        }
  
        WritableMemory mem2 = WritableMemory.allocate(memCapacity);
        mem1.copyTo(8, mem2, 16, 16);
  
        for (int i = 0; i < 16; i++) {
          assertEquals(mem1.getByte(8 + i), mem2.getByte(16 + i));
        }
        //println(mem2.toHexString("Mem2", 0, (int)mem2.getCapacity()));
      }
    }
  
    @Test
    public void checkCopyCrossRegionsSameNative() {
      int memCapacity = 128;
      try (WritableMemory mem1 = WritableMemory.allocateDirect(memCapacity)) {
        for (int i = 0; i < mem1.getCapacity(); i++) {
          mem1.putByte(i, (byte) i);
        }
        //println(mem1.toHexString("Mem1", 0, (int)mem1.getCapacity()));
  
        Memory reg1 = mem1.region(8, 16);
        //println(reg1.toHexString("Reg1", 0, (int)reg1.getCapacity()));
  
        WritableMemory reg2 = mem1.writableRegion(24, 16);
        //println(reg2.toHexString("Reg2", 0, (int)reg2.getCapacity()));
        reg1.copyTo(0, reg2, 0, 16);
  
        for (int i = 0; i < 16; i++) {
          assertEquals(reg1.getByte(i), reg2.getByte(i));
          assertEquals(mem1.getByte(8 + i), mem1.getByte(24 + i));
        }
        //println(mem1.toHexString("Mem1", 0, (int)mem1.getCapacity()));
      }
    }
  
    @Test
    public void checkCopyCrossNativeArrayAndHierarchicalRegions() {
      int memCapacity = 64;
      try (WritableMemory mem1 = WritableMemory.allocateDirect(memCapacity)) {
        for (int i = 0; i < mem1.getCapacity(); i++) { //fill with numbers
          mem1.putByte(i, (byte) i);
        }
        //println(mem1.toHexString("Mem1", 0, (int)mem1.getCapacity()));
  
        WritableMemory mem2 = WritableMemory.allocate(memCapacity);
  
        Memory reg1 = mem1.region(8, 32);
        Memory reg1B = reg1.region(8, 16);
        //println(reg1.toHexString("Reg1", 0, (int)reg1.getCapacity()));
        //println(reg1B.toHexString("Reg1B", 0, (int)reg1B.getCapacity()));
  
        WritableMemory reg2 = mem2.writableRegion(32, 16);
        reg1B.copyTo(0, reg2, 0, 16);
        //println(reg2.toHexString("Reg2", 0, (int)reg2.getCapacity()));
  
        //println(mem2.toHexString("Mem2", 0, (int)mem2.getCapacity()));
        for (int i = 32, j = 16; i < 40; i++, j++) {
          assertEquals(mem2.getByte(i), j);
        }
      }
    }
  
    @Test
    public void printlnTest() {
      println("PRINTING: " + this.getClass().getName());
    }
  
    /**
     * @param s value to print
     */
    static void println(String s) {
      //System.out.println(s); //disable here
    }
  
  }
  