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/*
 * Copyright (c) 2009 Jens Scheffler (appenginefan.com)
 * 
 * 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.appenginefan.toolkit.persistence;

import java.util.List;
import java.util.Map.Entry;

import com.google.common.base.Function;
import com.google.common.base.Functions;

import junit.framework.TestCase;

/**
 * A template for testing persistences that can digest
 * Strings.
 */
public class StringPersistenceTest
    extends TestCase {

  private StringPersistence persistence;

  /**
   * will set up a MapBasedPersistence if persistence is
   * null when called.
   */
  @Override
  protected void setUp() throws Exception {
    super.setUp();
    persistence =
        new StringPersistence(
            new MapBasedPersistence<byte[]>());
  }

  public void testConversion() {
    for (String s : new String[] { "regular String", "" }) {
      assertEquals(s, persistence.makeType(persistence
          .makeArray(s)));
    }
  }

  public void testBasicSetAndGet() {
    persistence.mutate("A", Functions.constant("A"));
    assertEquals(persistence.get("A"), "A");
  }

  public void testOverwrite() {
    persistence.mutate("A", Functions.constant("A"));
    assertEquals("B", persistence.mutate("A", Functions
        .constant("B")));
    assertEquals(persistence.get("A"), "B");
  }

  public void testGetUnknownKey() {
    assertNull(persistence.get("A"));
  }

  public void testDelete() {
    persistence.mutate("A", Functions.constant("A"));
    assertNull(persistence.mutate("A", Functions
        .constant((String) null)));
    assertNull(persistence.get("A"));
  }

  public void testFunctionInput() {
    persistence.mutate("A", Functions.constant("B"));
    persistence.mutate("A", new Function<String, String>() {
      @Override
      public String apply(String fromPersistence) {
        assertEquals(fromPersistence, "B");
        return "C";
      }
    });
    assertEquals(persistence.get("A"), "C");
  }

  public void testScan() {
    persistence.mutate("A1", Functions.constant("A1"));
    persistence.mutate("A2", Functions.constant("A2"));
    persistence.mutate("A3", Functions.constant("A3"));
    persistence.mutate("A2", Functions
        .constant((String) null));
    List<Entry<String, String>> scanResult =
        persistence.scan("A", "B", 10);
    assertEquals(2, scanResult.size());
    assertEquals("A1", scanResult.get(0).getKey());
    assertEquals("A3", scanResult.get(1).getKey());
    assertEquals("A1", scanResult.get(0).getValue());
    assertEquals("A3", scanResult.get(1).getValue());
    scanResult = persistence.scan("A1", "A3", 10);
    assertEquals(1, scanResult.size());
    assertEquals("A1", scanResult.get(0).getKey());
    scanResult = persistence.scan("A1", "A4", 1);
    assertEquals(1, scanResult.size());
    assertEquals("A1", scanResult.get(0).getKey());
    scanResult = persistence.scan("B", "Z", 10);
    assertEquals(0, scanResult.size());
    scanResult = persistence.scan("A1", "A4", 0);
    assertEquals(0, scanResult.size());
  }

  public void testScanReverse() {
    persistence.mutate("A1", Functions.constant("A1"));
    persistence.mutate("A2", Functions.constant("A2"));
    persistence.mutate("A3", Functions.constant("A3"));
    persistence.mutate("A2", Functions
        .constant((String) null));
    List<Entry<String, String>> scanResult =
        persistence.scanReverse("A", "B", 10);
    assertEquals(2, scanResult.size());
    assertEquals("A3", scanResult.get(0).getKey());
    assertEquals("A1", scanResult.get(1).getKey());
    assertEquals("A3", scanResult.get(0).getValue());
    assertEquals("A1", scanResult.get(1).getValue());
    scanResult = persistence.scanReverse("A1", "A3", 10);
    assertEquals(1, scanResult.size());
    assertEquals("A1", scanResult.get(0).getKey());
    scanResult = persistence.scanReverse("A0", "A4", 1);
    assertEquals(1, scanResult.size());
    assertEquals("A3", scanResult.get(0).getKey());
    scanResult = persistence.scanReverse("B", "Z", 10);
    assertEquals(0, scanResult.size());
    scanResult = persistence.scanReverse("A0", "A4", 0);
    assertEquals(0, scanResult.size());
  }
}