package cc.twittertools.words;

//=================================================================================================
//Copyright 2011 Twitter, Inc.
//-------------------------------------------------------------------------------------------------
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this work except in compliance with the License.
//You may obtain a copy of the License in the LICENSE file, or 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.
//=================================================================================================

//=================================================================================================
// Amended to handle the 'ts case, notably the phrase "do's and don'ts", but also references to
// "gov'ts" as an abbreviation for "governement's".
//
// - Bryan Feeney
//=================================================================================================

import java.util.regex.Pattern;

import com.twitter.common.text.combiner.ExtractorBasedTokenCombiner;
import com.twitter.common.text.extractor.RegexExtractor;
import com.twitter.common.text.token.TokenStream;

/**
* Combines multiple tokens denoting a possessive form (e.g., Twitter's) or
* a contraction form (e.g., isn't) back into a single token.
*/
public class MyPossessiveContractionTokenCombiner extends ExtractorBasedTokenCombiner {
	private static final Pattern APOSTROPHE_S = Pattern.compile("([a-zA-Z]+'(?i:t|ts|s|m|re|ve|ll|d))([^a-zA-Z]|$)");

	public MyPossessiveContractionTokenCombiner(TokenStream inputStream) {
	  super(inputStream);
	  setExtractor(
			new RegexExtractor
			.Builder()
			.setRegexPattern(APOSTROPHE_S, 1, 1)
	    .setTriggeringChar('\'')
	    .build()
	  );
	}
}

Add support for better apostrophe-d abbrevations such as don'ts and gov'ts