Java tutorial
/* * Copyright 2015 Steve Ash * * 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.github.steveash.jg2p.seq; import com.github.steveash.jg2p.util.TokenSeqUtil; import org.apache.commons.lang3.StringUtils; import cc.mallet.pipe.Pipe; import cc.mallet.types.Instance; import cc.mallet.types.Token; import cc.mallet.types.TokenSequence; import static org.apache.commons.lang3.StringUtils.isNotBlank; /** * @author Steve Ash */ public class LeadingTrailingFeature extends Pipe { @Override public Instance pipe(Instance carrier) { TokenSequence ts = (TokenSequence) carrier.getData(); if (ts.size() >= 2) { Token first = ts.get(0); Token last = ts.get(ts.size() - 1); String firstShape = TokenSeqUtil.convertShape(StringUtils.left(first.getText(), 1)); String lastShape = TokenSeqUtil.convertShape(StringUtils.right(last.getText(), 1)); first.setFeatureValue("FIRST", 1.0); if (isNotBlank(firstShape)) { first.setFeatureValue("FIRST-" + firstShape, 1.0); } last.setFeatureValue("LAST", 1.0); if (isNotBlank(lastShape)) { last.setFeatureValue("LAST-" + lastShape, 1.0); } } return carrier; } }