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.
   */
  
  /*
   * Note: Lincoln's Gettysburg Address is in the public domain. See LICENSE.
   */
  
  package org.apache.datasketches.memory.internal;
  
  import static org.apache.datasketches.memory.internal.Util.getResourceFile;
  import static org.testng.Assert.assertEquals;
  import static org.testng.Assert.assertTrue;
  import static org.testng.Assert.fail;
  
  import java.io.File;
  import java.nio.ByteOrder;
  
  import org.apache.datasketches.memory.Memory;
  import org.testng.annotations.BeforeClass;
  import org.testng.annotations.Test;
  
  public class AllocateDirectMapMemoryTest {
    private static final String LS = System.getProperty("line.separator");
  
    @BeforeClass
    public void setReadOnly() {
      UtilTest.setGettysburgAddressFileToReadOnly();
    }
  
    @Test(expectedExceptions = IllegalStateException.class)
    public void simpleMap() {
      File file = getResourceFile("GettysburgAddress.txt");
      assertTrue(AllocateDirectWritableMap.isFileReadOnly(file));
      try (Memory mem = Memory.map(file)) {
        mem.close(); //explicit close
      } //The Try-With-Resources will throw if already closed
    }
  
    @Test
    public void printGettysbergAddress()  {
      File file = getResourceFile("GettysburgAddress.txt");
      try (Memory mem = Memory.map(file))
      {
        println("Mem Cap:       " + mem.getCapacity());
        println("Total Offset:  " + mem.getTotalOffset());
        println("Cum Offset:    " + ((ResourceImpl)mem).getCumulativeOffset(0));
        println("Total Offset: " + mem.getTotalOffset());
        StringBuilder sb = new StringBuilder();
        mem.getCharsFromUtf8(43, 176, sb);
        println(sb.toString());
  
        println("");
        Memory mem2 = mem.region(43 + 76, 20);
        println("Mem Cap:       " + mem2.getCapacity());
        println("Offset:        " + mem.getTotalOffset());
        println("Cum Offset:    " + ((ResourceImpl)mem2).getCumulativeOffset(0));
        println("Total Offset: " + mem2.getTotalOffset());
        StringBuilder sb2 = new StringBuilder();
        mem2.getCharsFromUtf8(0, 12, sb2);
        println(sb2.toString());
      }
    }
  
    @Test
    public void testIllegalArguments() {
      File file = getResourceFile("GettysburgAddress.txt");
      try (Memory mem = Memory.map(file, -1, Integer.MAX_VALUE, ByteOrder.nativeOrder())) {
        fail("Failed: Position was negative.");
      } catch (IllegalArgumentException e) {
        //ok
      }
  
      try (Memory mem = Memory.map(file, 0, -1, ByteOrder.nativeOrder())) {
        fail("Failed: Size was negative.");
      } catch (IllegalArgumentException e) {
        //ok
      }
    }
  
    @Test(expectedExceptions = IllegalStateException.class)
    public void testAccessAfterClose() {
      File file = getResourceFile("GettysburgAddress.txt");
      long memCapacity = file.length();
      try (Memory mem = Memory.map(file, 0, memCapacity, ByteOrder.nativeOrder())) {
        assertEquals(memCapacity, mem.getCapacity());
      } //normal close via TWR
      Memory mem = Memory.map(file, 0, memCapacity, ByteOrder.nativeOrder());
      mem.close(); //normal manual close
      mem.getCapacity(); //isLoaded(); //already closed, invalid
    }
  
    @Test(expectedExceptions = IllegalStateException.class)
    public void testReadFailAfterClose()  {
      File file = getResourceFile("GettysburgAddress.txt");
      long memCapacity = file.length();
      Memory mem = Memory.map(file, 0, memCapacity, ByteOrder.nativeOrder());
      mem.close();
      mem.isLoaded();
    }
  
    @Test
    public void testLoad()  {
      File file = getResourceFile("GettysburgAddress.txt");
      long memCapacity = file.length();
      try (Memory mem = Memory.map(file, 0, memCapacity, ByteOrder.nativeOrder())) {
        mem.load();
        assertTrue(mem.isLoaded());
      } //normal TWR close
    }
  
    @Test
    public void printlnTest() {
      println("PRINTING: " + this.getClass().getName());
    }
  
    static void println(final Object o) {
      if (o == null) { print(LS); }
      else { print(o.toString() + LS); }
    }
  
    /**
     * @param o value to print
     */
    static void print(final Object o) {
      if (o != null) {
        //System.out.print(o.toString()); //disable here
      }
    }
  
  }
  