plugins/hg4idea/src/org/zmlx/hg4idea/util/HgReferenceValidator.java

/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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 org.zmlx.hg4idea.util;

import com.intellij.openapi.ui.InputValidatorEx;
import com.intellij.openapi.util.text.StringUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.zmlx.hg4idea.repo.HgRepository;

import java.util.Collection;
import java.util.regex.Pattern;

import static org.zmlx.hg4idea.util.HgUtil.TIP_REFERENCE;

public class HgReferenceValidator implements InputValidatorEx {

  private final HgRepository myRepository;
  private String myErrorText;

  private static final Pattern ILLEGAL = Pattern.compile(
    ".*:.*|" + // colon character is not allowed
    "[0-9]*" // reference name couldn't contain only digits
  );

  private HgReferenceValidator(@NotNull HgRepository repository) {
    myRepository = repository;
  }

  public static HgReferenceValidator newInstance(@NotNull HgRepository repository) {
    return new HgReferenceValidator(repository);
  }

  @Override
  public boolean checkInput(@Nullable String name) {
    if (StringUtil.isEmptyOrSpaces(name)) {
      return false;
    }
    if (ILLEGAL.matcher(name).matches()) {
      myErrorText = "Invalid name for branch/tag";
      return false;
    }
    return !isReservedWord(name) && !hasConflictsWithAnotherBranch(name);
  }

  @Override
  public boolean canClose(@Nullable String name) {
    return checkInput(name);
  }

  boolean isReservedWord(@Nullable String name) {
    myErrorText = TIP_REFERENCE.equals(name) ? String.format("The name \'%s\' is reserved.", name) : null;
    return myErrorText != null;
  }

  boolean hasConflictsWithAnotherBranch(@Nullable String name) {
    Collection<String> branches = myRepository.getBranches().keySet();
    String currentBranch = myRepository.getCurrentBranch(); //  branches set doesn't contain uncommitted branch -> need an addition check
    myErrorText = currentBranch.equals(name) || branches.contains(name)
                  ? String.format("A branch with the \'%s\' name already exists", name) : null;
    return myErrorText != null;
  }

  @Nullable
  @Override
  public String getErrorText(@Nullable String inputString) {
    return myErrorText;
  }
}