Examples of org.apache.solr.util.DateMathParser

org.apache.solr.util.DateMathParser
A Simple Utility class for parsing "math" like strings relating to Dates.
The basic syntax support addition, subtraction and rounding at various levels of granularity (or "units"). Commands can be chained together and are parsed from left to right. '+' and '-' denote addition and subtraction, while '/' denotes "round". Round requires only a unit, while addition/subtraction require an integer value and a unit. Command strings must not include white space, but the "No-Op" command (empty string) is allowed....
```
 /HOUR ... Round to the start of the current hour /DAY ... Round to the start of the current day +2YEARS ... Exactly two years in the future from now -1DAY ... Exactly 1 day prior to now /DAY+6MONTHS+3DAYS ... 6 months and 3 days in the future from the start of the current day +6MONTHS+3DAYS/DAY ... 6 months and 3 days in the future from now, rounded down to nearest day 
```
All commands are relative to a "now" which is fixed in an instance of DateMathParser such that p.parseMath("+0MILLISECOND").equals(p.parseMath("+0MILLISECOND")) no matter how many wall clock milliseconds elapse between the two distinct calls to parse (Assuming no other thread calls "setNow" in the interim)

Multiple aliases exist for the various units of time (ie: MINUTE and MINUTES; MILLI, MILLIS, MILLISECOND, and MILLISECONDS.) The complete list can be found by inspecting the keySet of CALENDAR_UNITS.
@version $Id:$

   * @param now an optional fixed date to use as "NOW" in the DateMathParser
   * @param val the string to parse
   */
  public Date parseMath(Date now, String val) {
    String math = null;
    final DateMathParser p = new DateMathParser(MATH_TZ, MATH_LOCALE);
    
    if (null != now) p.setNow(now);
    
    if (val.startsWith(NOW)) {
      math = val.substring(NOW.length());
    } else {
      final int zz = val.indexOf(Z);
      if (0 < zz) {
        math = val.substring(zz+1);
        try {
          // p.setNow(toObject(val.substring(0,zz)));
          p.setNow(parseDate(val.substring(0,zz+1)));
        } catch (ParseException e) {
          throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,
                                   "Invalid Date in Date Math String:'"
                                   +val+'\'',e);
        }
      } else {
        throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,
                                 "Invalid Date String:'" +val+'\'');
      }
    }


    if (null == math || math.equals("")) {
      return p.getNow();
    }
    
    try {
      return p.parseMath(math);
    } catch (ParseException e) {
      throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,
                               "Invalid Date Math String:'" +val+'\'',e);
    }
  }

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   * @param now an optional fixed date to use as "NOW" in the DateMathParser
   * @param val the string to parse
   */
  public Date parseMathLenient(Date now, String val, SolrQueryRequest req) {
    String math = null;
    final DateMathParser p = new DateMathParser(MATH_TZ, MATH_LOCALE);


    if (null != now) p.setNow(now);


    if (val.startsWith(NOW)) {
      math = val.substring(NOW.length());
    } else {
      final int zz = val.indexOf(Z);
      if (0 < zz) {
        math = val.substring(zz+1);
        try {
          // p.setNow(toObject(val.substring(0,zz)));
          p.setNow(parseDateLenient(val.substring(0,zz+1), req));
        } catch (ParseException e) {
          throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,
                                   "Invalid Date in Date Math String:'"
                                   +val+'\'',e);
        }
      } else {
        throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,
                                 "Invalid Date String:'" +val+'\'');
      }
    }


    if (null == math || math.equals("")) {
      return p.getNow();
    }


    try {
      return p.parseMath(math);
    } catch (ParseException e) {
      throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,
                               "Invalid Date Math String:'" +val+'\'',e);
    }
  }

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        // delete anything too old, regardless of other policies
        try {
          if (maxCommitAge != null) {
            if (maxCommitAgeTimeStamp==-1) {
              DateMathParser dmp = new DateMathParser(DateField.UTC, Locale.US);
              maxCommitAgeTimeStamp = dmp.parseMath(maxCommitAge).getTime();
            }
            if (commit.getTimestamp() < maxCommitAgeTimeStamp) {
              commit.delete();
              continue;
            }

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  protected DateMathParser p = null;
  
  @Override
  public void setUp() throws Exception {
    super.setUp();
    p = new DateMathParser(UTC, Locale.US);
    f = new DateField();
    // so test can be run against Solr 1.2...
    try {
      Class clazz = Class.forName("org.apache.solr.schema.LegacyDateField");
      f = (DateField) clazz.newInstance();

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          (SolrException.ErrorCode.BAD_REQUEST,
              "date facet 'end' comes before 'start': "+endS+" < "+startS);
    }


    final String gap = required.getFieldParam(f,FacetParams.FACET_DATE_GAP);
    final DateMathParser dmp = new DateMathParser(ft.UTC, Locale.US);
    dmp.setNow(NOW);


    final int minCount = params.getFieldInt(f,FacetParams.FACET_MINCOUNT, 0);


    String[] iStrs = params.getFieldParams(f,FacetParams.FACET_DATE_INCLUDE);
    // Legacy support for default of [lower,upper,edge] for date faceting
    // this is not handled by FacetRangeInclude.parseParam because
    // range faceting has differnet defaults
    final EnumSet<FacetRangeInclude> include = 
      (null == iStrs || 0 == iStrs.length ) ?
      EnumSet.of(FacetRangeInclude.LOWER, 
                 FacetRangeInclude.UPPER, 
                 FacetRangeInclude.EDGE)
      : FacetRangeInclude.parseParam(iStrs);


    try {
      Date low = start;
      while (low.before(end)) {
        dmp.setNow(low);
        String label = ft.toExternal(low);


        Date high = dmp.parseMath(gap);
        if (end.before(high)) {
          if (params.getFieldBool(f,FacetParams.FACET_DATE_HARD_END,false)) {
            high = end;
          } else {
            end = high;

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    protected Object parseGap(final String rawval) {
      return rawval;
    }
    @Override
    public Date parseAndAddGap(Date value, String gap) throws java.text.ParseException {
      final DateMathParser dmp = new DateMathParser(DateField.UTC, Locale.US);
      dmp.setNow(value);
      return dmp.parseMath(gap);
    }

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    // Test date math syntax
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
    format.setTimeZone(TimeZone.getTimeZone("UTC"));


    assertU(delQ("*:*"));
    DateMathParser dmp = new DateMathParser(DateField.UTC, Locale.US);
    String largestDate = "";
    for (int i = 0; i < 10; i++) {
      // index 10 days starting with today
      String d = format.format(i == 0 ? dmp.parseMath("/DAY") : dmp.parseMath("/DAY+" + i + "DAYS"));
      assertU(adoc("id", String.valueOf(i), "tdate", d));
      if (i == 9) largestDate = d;
    }
    assertU(commit());
    assertQ("Range filter must match only 10 documents", req("q", "*:*", "fq", "tdate:[* TO *]"), "//*[@numFound='10']");

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    checkPrecisionSteps("tdate");


    // For tdate tests
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
    format.setTimeZone(TimeZone.getTimeZone("UTC"));
    DateMathParser dmp = new DateMathParser(DateField.UTC, Locale.US);


    for (int i = 0; i < 10; i++) {
      long l = Integer.MAX_VALUE + i*1L;
      // index 10 days starting with today
      String d = format.format(i == 0 ? dmp.parseMath("/DAY") : dmp.parseMath("/DAY+" + i + "DAYS"));
      assertU(adoc("id", String.valueOf(i), "tint", String.valueOf(i),
              "tlong", String.valueOf(l),
              "tfloat", String.valueOf(i * i * 31.11f),
              "tdouble", String.valueOf(i * 2.33d),
              "tdate", d));
    }
    for (int i = 0; i < 5; i++) {
      long l = Integer.MAX_VALUE + i*1L;
      String d = format.format(i == 0 ? dmp.parseMath("/DAY") : dmp.parseMath("/DAY+" + i + "DAYS"));
      assertU(adoc("id", String.valueOf((i+1)*10), "tint", String.valueOf(i),
              "tlong", String.valueOf(l),
              "tfloat", String.valueOf(i * i * 31.11f),
              "tdouble", String.valueOf(i * 2.33d),
              "tdate", d));
    }
    assertU(commit());


    SolrQueryRequest req = req("q", "*:*", "facet", "true", "rows", "15",
            "facet.field", "tint",
            "facet.field", "tlong",
            "facet.field", "tfloat",
            "facet.field", "tdouble",
            "facet.date", "tdate",
            "facet.date.start", "NOW/DAY",
            "facet.date.end", "NOW/DAY+6DAYS",
            "facet.date.gap", "+1DAY");
    testFacetField(req, "tint", "0", "2");
    testFacetField(req, "tint", "5", "1");
    testFacetField(req, "tlong", String.valueOf(Integer.MAX_VALUE), "2");
    testFacetField(req, "tlong", String.valueOf(Integer.MAX_VALUE+5L), "1");
    testFacetField(req, "tfloat", String.valueOf(31.11f), "2");
    testFacetField(req, "tfloat", String.valueOf(5*5*31.11f), "1");
    testFacetField(req, "tdouble", String.valueOf(2.33d), "2");
    testFacetField(req, "tdouble", String.valueOf(5*2.33d), "1");


    testFacetDate(req, "tdate", format.format(dmp.parseMath("/DAY")), "4");
    testFacetDate(req, "tdate", format.format(dmp.parseMath("/DAY+5DAYS")), "2");
  }

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              .getFunctionsNamespace(Collections.EMPTY_LIST,null));


      SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
      format.setTimeZone(TimeZone.getTimeZone("UTC"));
      resetEvaluatorBagDateMathParser();
      DateMathParser dmp = new DateMathParser(TimeZone.getDefault(), Locale.getDefault());


      String s = vri.replaceTokens("${dataimporter.functions.formatDate('NOW/DAY','yyyy-MM-dd HH:mm')}");
      assertEquals(new SimpleDateFormat("yyyy-MM-dd HH:mm").format(dmp.parseMath("/DAY")), s);
    } finally {
      Context.CURRENT_CONTEXT.remove();
    }
  }

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      l.add(m);


      SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
      format.setTimeZone(TimeZone.getTimeZone("UTC"));
      resetEvaluatorBagDateMathParser();
      DateMathParser dmp = new DateMathParser(TimeZone.getDefault(), Locale.getDefault());


      resolver.addNamespace("dataimporter.functions", EvaluatorBag
              .getFunctionsNamespace(l,null));
      String s = resolver
              .replaceTokens("${dataimporter.functions.formatDate('NOW/DAY','yyyy-MM-dd HH:mm')}");
      assertEquals(new SimpleDateFormat("yyyy-MM-dd HH:mm")
              .format(dmp.parseMath("/DAY")), s);
      assertEquals("Hello World", resolver
              .replaceTokens("${dataimporter.functions.test('TEST')}"));
    } finally {
      Context.CURRENT_CONTEXT.remove();
    }

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