plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/GroovyHashBangFileTypeDetector.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.jetbrains.plugins.groovy;

import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.fileTypes.FileTypeRegistry;
import com.intellij.openapi.util.io.ByteSequence;
import com.intellij.openapi.util.io.FileUtil;
import com.intellij.openapi.vfs.VirtualFile;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * Created by Max Medvedev on 17/03/14
 */
public class GroovyHashBangFileTypeDetector implements FileTypeRegistry.FileTypeDetector {
  @Nullable
  @Override
  public FileType detect(@NotNull VirtualFile file, @NotNull ByteSequence firstBytes, @Nullable CharSequence firstCharsIfText) {
    if (FileUtil.isHashBangLine(firstCharsIfText, "groovy")) {
      return GroovyFileType.GROOVY_FILE_TYPE;
    }

    return null;
  }

  @Override
  public int getVersion() {
    return 1;
  }
}