de.monticore.parsing.Parser.java Source code

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Here is the source code for de.monticore.parsing.Parser.java

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/*
 * ******************************************************************************
 * MontiCore Language Workbench
 * Copyright (c) 2015, MontiCore, All rights reserved.
 *
 * This project 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 3.0 of the License, or (at your option) any later version.
 * This library 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 project. If not, see <http://www.gnu.org/licenses/>.
 * ******************************************************************************
 */

package de.monticore.parsing;

import static com.google.common.base.Preconditions.checkArgument;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;

import de.monticore.ast.ASTNode;

import com.google.common.io.CharSource;
import com.google.common.io.Files;

import de.monticore.MontiCoreConstants;
import de.se_rwth.commons.logging.Log;

/**
 * A base class for parsers generated by MontiCore.
 * 
 * @author (last commit) $Author$
 * @version $Revision$, $Date$
 */
public abstract class Parser {

    /**
     * Parses the given {@link CharSource}.
     * 
     * @return the ast of the resulting model.
     */
    public abstract ASTNode parse(CharSource model);

    /**
     * Parses the given {@link CharSequence}.
     * 
     * @return the ast of the resulting model.
     */
    public final ASTNode parse(CharSequence model) {
        return parse(CharSource.wrap(Log.errorIfNull(model)));
    }

    /**
     * Parses the given {@link InputStream}.
     * 
     * @return the ast of the resulting model.
     */
    public final ASTNode parse(final InputStream model) {
        return parse(new CharSource() {
            @Override
            public Reader openStream() throws IOException {
                return new InputStreamReader(model);
            }
        });
    }

    /**
     * Parses the given {@link File}.
     * 
     * @return the ast of the resulting model.
     */
    public final ASTNode parse(File modelFile) {
        Log.errorIfNull(modelFile);
        checkArgument(modelFile.exists());
        return parse(Files.asCharSource(modelFile, getCharSet()));
    }

    /**
     * @return the {@link Charset} used by this parser when reading files.
     */
    protected Charset getCharSet() {
        return MontiCoreConstants.DEFAULT_MODELFILE_CHARSET;
    }

}