// Copyright (C) 2008 The Android Open Source Project
//
// 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.google.gerrit.client.changes;

import com.google.gerrit.client.Gerrit;
import com.google.gerrit.client.info.ChangeInfo;
import com.google.gerrit.client.rpc.GerritCallback;
import com.google.gerrit.common.PageLinks;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.RevId;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwtorm.client.KeyUtil;

public class QueryScreen extends PagedSingleListScreen implements
    ChangeListScreen {
  public static QueryScreen forQuery(String query) {
    return forQuery(query, 0);
  }

  public static QueryScreen forQuery(String query, int start) {
    return new QueryScreen(KeyUtil.encode(query), start);
  }

  private final String query;

  public QueryScreen(String encQuery, int start) {
    super(PageLinks.QUERY + encQuery, start);
    query = KeyUtil.decode(encQuery);
  }

  @Override
  protected void onInitUI() {
    super.onInitUI();
    setWindowTitle(Util.M.changeQueryWindowTitle(query));
    setPageTitle(Util.M.changeQueryPageTitle(query));
  }

  @Override
  protected AsyncCallback<ChangeList> loadCallback() {
    return new GerritCallback<ChangeList>() {
      @Override
      public void onSuccess(ChangeList result) {
        if (isAttached()) {
          if (result.length() == 1 && isSingleQuery(query)) {
            ChangeInfo c = result.get(0);
            Change.Id id = c.legacyId();
            Gerrit.display(PageLinks.toChange(id));
          } else {
            display(result);
            QueryScreen.this.display();
          }
        }
      }
    };
  }

  @Override
  public void onShowView() {
    super.onShowView();
    Gerrit.setQueryString(query);
  }

  @Override
  protected void onLoad() {
    super.onLoad();
    ChangeList.query(
        query, ChangeTable.OPTIONS, loadCallback(), start, pageSize);
  }

  private static boolean isSingleQuery(String query) {
    if (query.matches("^[1-9][0-9]*$")) {
      // Legacy numeric identifier.
      //
      return true;
    }

    if (query.matches("^[iI][0-9a-f]{4,}$")) {
      // Newer style Change-Id.
      //
      return true;
    }

    if (query.matches("^([0-9a-fA-F]{4," + RevId.LEN + "})$")) {
      // Commit SHA-1 of any change.
      //
      return true;
    }

    return false;
  }
}

@@ -926,16 +926,60 @@
 .RevId;%0A
+import com.google.gwt.regexp.shared.RegExp;%0A
 import c
@@ -1154,16 +1154,408 @@
 creen %7B%0A
+  // Legacy numeric identifier.%0A  private static final RegExp NUMERIC_ID = RegExp.compile(%22%5E%5B1-9%5D%5B0-9%5D*$%22);%0A  // Commit SHA1 hash%0A  private static final RegExp COMMIT_SHA1 =%0A      RegExp.compile(%22%5E(%5B0-9a-fA-F%5D%7B4,%22 + RevId.LEN + %22%7D)$%22);%0A  // Change-Id%0A  private static final String ID_PATTERN = %22%5BiI%5D%5B0-9a-f%5D%7B4,%7D$%22;%0A  private static final RegExp CHANGE_ID = RegExp.compile(%22%5E%22 + ID_PATTERN);%0A%0A
   public
@@ -2971,384 +2971,105 @@
     
-if (query.matches(%22%5E%5B1-9%5D%5B0-9%5D*$%22)) %7B%0A      // Legacy numeric identifier.%0A      //%0A      return true;%0A    %7D%0A%0A    if (query.matches(%22%5E%5BiI%5D%5B0-9a-f%5D%7B4,%7D$%22)) %7B%0A      // Newer style Change-Id.%0A      //%0A      return true;%0A    %7D%0A%0A    if (query.matches(%22%5E(%5B0-9a-fA-F%5D%7B4,%22 + RevId.LEN + %22%7D)$%22)) %7B%0A      // Commit SHA-1 of any change.%0A      //%0A      return true;%0A    %7D%0A%0A    return false
+return NUMERIC_ID.test(query)%0A        %7C%7C CHANGE_ID.test(query)%0A        %7C%7C COMMIT_SHA1.test(query)
 ;%0A  

Use precompiled regex patterns to test for single query