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/*
* SonarQube
* Copyright (C) 2009-2016 SonarSource SA
* mailto:contact AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.duplications.statement;
import java.util.ArrayList;
import java.util.List;
import org.sonar.duplications.DuplicationsException;
import org.sonar.duplications.statement.matcher.TokenMatcher;
import org.sonar.duplications.token.TokenQueue;
public final class StatementChunker {
private final StatementChannelDisptacher channelDispatcher;
public static Builder builder() {
return new Builder();
}
private StatementChunker(Builder builder) {
this.channelDispatcher = builder.getChannelDispatcher();
}
public List<Statement> chunk(TokenQueue tokenQueue) {
if (tokenQueue == null) {
throw new IllegalArgumentException();
}
List<Statement> statements = new ArrayList<>();
try {
channelDispatcher.consume(tokenQueue, statements);
return statements;
} catch (Exception e) {
throw new DuplicationsException("Unable to build statement from token : " + tokenQueue.peek(), e);
}
}
/**
* Note that order is important, e.g.
* <code>statement(token(A)).ignore(token(A))</code> for the input sequence "A" will produce statement, whereas
* <code>ignore(token(A)).statement(token(A))</code> will not.
*/
public static final class Builder {
private List<StatementChannel> channels = new ArrayList<>();
private Builder() {
}
public StatementChunker build() {
return new StatementChunker(this);
}
/**
* Defines that sequence of tokens must be ignored, if it matches specified list of matchers.
*
* @see TokenMatcherFactory
*/
public Builder ignore(TokenMatcher... matchers) {
channels.add(StatementChannel.createBlackHole(matchers));
return this;
}
/**
* Defines that sequence of tokens, which is matched specified list of matchers, is a statement.
*
* @see TokenMatcherFactory
*/
public Builder statement(TokenMatcher... matchers) {
channels.add(StatementChannel.create(matchers));
return this;
}
private StatementChannelDisptacher getChannelDispatcher() {
return new StatementChannelDisptacher(channels);
}
}
}
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