| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.opennlp.utils.cfg; |
| |
| import java.util.Collection; |
| |
| /** |
| * A builder for {@link ContextFreeGrammar}s |
| */ |
| public class CFGBuilder { |
| |
| private Collection<String> nonTerminalSymbols; |
| private Collection<String> terminalSymbols; |
| private Collection<Rule> rules; |
| private String startSymbol; |
| private boolean randomExpansion; |
| |
| public static CFGBuilder createCFG() { |
| return new CFGBuilder(); |
| } |
| |
| public CFGBuilder withTerminals(Collection<String> terminalSymbols) { |
| this.terminalSymbols = terminalSymbols; |
| return this; |
| } |
| |
| public CFGBuilder withNonTerminals(Collection<String> nonTerminalSymbols) { |
| this.nonTerminalSymbols = nonTerminalSymbols; |
| return this; |
| } |
| |
| public CFGBuilder withRules(Collection<Rule> rules) { |
| this.rules = rules; |
| return this; |
| } |
| |
| public CFGBuilder withStartSymbol(String startSymbol) { |
| this.startSymbol = startSymbol; |
| return this; |
| } |
| |
| public CFGBuilder withRandomExpansion(boolean randomExpansion) { |
| this.randomExpansion = randomExpansion; |
| return this; |
| } |
| |
| public ContextFreeGrammar build() { |
| assert nonTerminalSymbols != null && terminalSymbols != null && rules != null && startSymbol != null : |
| "missing definitions { V : " + nonTerminalSymbols + ", ∑ : " + terminalSymbols + ", R : " + rules + ", S : " + startSymbol + "}"; |
| return new ContextFreeGrammar(nonTerminalSymbols, terminalSymbols, rules, startSymbol, randomExpansion); |
| } |
| } |