package org.apache.lucene.analysis.path;

/**
 * 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.
 */

import java.io.Reader;
import java.io.StringReader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.ReusableAnalyzerBase;
import org.apache.lucene.analysis.Tokenizer;

public class TestReversePathHierarchyTokenizer extends BaseTokenStreamTestCase {

  public void testBasicReverse() throws Exception {
    String path = "/a/b/c";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path) );
    assertTokenStreamContents(t,
        new String[]{"/a/b/c", "a/b/c", "b/c", "c"},
        new int[]{0, 1, 3, 5},
        new int[]{6, 6, 6, 6},
        new int[]{1, 0, 0, 0},
        path.length());
  }

  public void testEndOfDelimiterReverse() throws Exception {
    String path = "/a/b/c/";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path) );
    assertTokenStreamContents(t,
        new String[]{"/a/b/c/", "a/b/c/", "b/c/", "c/"},
        new int[]{0, 1, 3, 5},
        new int[]{7, 7, 7, 7},
        new int[]{1, 0, 0, 0},
        path.length());
  }

  public void testStartOfCharReverse() throws Exception {
    String path = "a/b/c";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path) );
    assertTokenStreamContents(t,
        new String[]{"a/b/c", "b/c", "c"},
        new int[]{0, 2, 4},
        new int[]{5, 5, 5},
        new int[]{1, 0, 0},
        path.length());
  }

  public void testStartOfCharEndOfDelimiterReverse() throws Exception {
    String path = "a/b/c/";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path) );
    assertTokenStreamContents(t,
        new String[]{"a/b/c/", "b/c/", "c/"},
        new int[]{0, 2, 4},
        new int[]{6, 6, 6},
        new int[]{1, 0, 0},
        path.length());
  }

  public void testOnlyDelimiterReverse() throws Exception {
    String path = "/";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path) );
    assertTokenStreamContents(t,
        new String[]{"/"},
        new int[]{0},
        new int[]{1},
        new int[]{1},
        path.length());
  }

  public void testOnlyDelimitersReverse() throws Exception {
    String path = "//";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path) );
    assertTokenStreamContents(t,
        new String[]{"//", "/"},
        new int[]{0, 1},
        new int[]{2, 2},
        new int[]{1, 0},
        path.length());
  }

  public void testEndOfDelimiterReverseSkip() throws Exception {
    String path = "/a/b/c/";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path), 1 );
    assertTokenStreamContents(t,
        new String[]{"/a/b/", "a/b/", "b/"},
        new int[]{0, 1, 3},
        new int[]{5, 5, 5},
        new int[]{1, 0, 0},
        path.length());
  }

  public void testStartOfCharReverseSkip() throws Exception {
    String path = "a/b/c";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path), 1 );
    assertTokenStreamContents(t,
        new String[]{"a/b/", "b/"},
        new int[]{0, 2},
        new int[]{4, 4},
        new int[]{1, 0},
        path.length());
  }

  public void testStartOfCharEndOfDelimiterReverseSkip() throws Exception {
    String path = "a/b/c/";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path), 1 );
    assertTokenStreamContents(t,
        new String[]{"a/b/", "b/"},
        new int[]{0, 2},
        new int[]{4, 4},
        new int[]{1, 0},
        path.length());
  }

  public void testOnlyDelimiterReverseSkip() throws Exception {
    String path = "/";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path), 1 );
    assertTokenStreamContents(t,
        new String[]{},
        new int[]{},
        new int[]{},
        new int[]{},
        path.length());
  }

  public void testOnlyDelimitersReverseSkip() throws Exception {
    String path = "//";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path), 1 );
    assertTokenStreamContents(t,
        new String[]{"/"},
        new int[]{0},
        new int[]{1},
        new int[]{1},
        path.length());
  }

  public void testReverseSkip2() throws Exception {
    String path = "/a/b/c/";
    ReversePathHierarchyTokenizer t = new ReversePathHierarchyTokenizer( new StringReader(path), 2 );
    assertTokenStreamContents(t,
        new String[]{"/a/", "a/"},
        new int[]{0, 1},
        new int[]{3, 3},
        new int[]{1, 0},
        path.length());
  }
  
  /** blast some random strings through the analyzer */
  public void testRandomStrings() throws Exception {
    Analyzer a = new ReusableAnalyzerBase() {
      @Override
      protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
        Tokenizer tokenizer = new ReversePathHierarchyTokenizer(reader);
        return new TokenStreamComponents(tokenizer, tokenizer);
      }    
    };
    checkRandomData(random, a, 10000*RANDOM_MULTIPLIER);
  }
  
  /** blast some random large strings through the analyzer */
  public void testRandomHugeStrings() throws Exception {
    Analyzer a = new ReusableAnalyzerBase() {
      @Override
      protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
        Tokenizer tokenizer = new ReversePathHierarchyTokenizer(reader);
        return new TokenStreamComponents(tokenizer, tokenizer);
      }    
    };
    checkRandomData(random, a, 200*RANDOM_MULTIPLIER, 1027);
  }
}
