de.learnlib.algorithms.features.observationtable.writer.AbstractObservationTableWriter.java Source code

Introduction

Here is the source code for de.learnlib.algorithms.features.observationtable.writer.AbstractObservationTableWriter.java

Source

/* Copyright (C) 2014 TU Dortmund
 * This file is part of LearnLib, http://www.learnlib.de/.
 *
 * 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 de.learnlib.algorithms.features.observationtable.writer;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintStream;

import com.google.common.base.Function;
import com.google.common.base.Functions;

import de.learnlib.algorithms.features.observationtable.ObservationTable;

import net.automatalib.words.Word;

public abstract class AbstractObservationTableWriter<I, D> implements ObservationTableWriter<I, D> {

    private Function<? super Word<? extends I>, ? extends String> wordToString;
    private Function<? super D, ? extends String> outputToString;

    public AbstractObservationTableWriter() {
        this(Functions.toStringFunction(), Functions.toStringFunction());
    }

    public AbstractObservationTableWriter(Function<? super Word<? extends I>, ? extends String> wordToString,
            Function<? super D, ? extends String> outputToString) {
        this.wordToString = safeToStringFunction(wordToString);
        this.outputToString = safeToStringFunction(outputToString);
    }

    public void setWordToString(Function<? super Word<? extends I>, ? extends String> wordToString) {
        this.wordToString = safeToStringFunction(wordToString);
    }

    public void setOutputToString(Function<? super D, ? extends String> outputToString) {
        this.outputToString = safeToStringFunction(outputToString);
    }

    protected String wordToString(Word<? extends I> word) {
        return wordToString.apply(word);
    }

    protected String outputToString(D output) {
        return outputToString.apply(output);
    }

    protected static <T> Function<? super T, ? extends String> safeToStringFunction(
            Function<? super T, ? extends String> toStringFunction) {
        if (toStringFunction != null) {
            return toStringFunction;
        }
        return Functions.toStringFunction();
    }

    @Override
    public void write(ObservationTable<? extends I, ? extends D> table, PrintStream out) {
        try {
            write(table, (Appendable) out);
        } catch (IOException ex) {
            throw new AssertionError("Writing to PrintStream must not throw");
        }
    }

    @Override
    public void write(ObservationTable<? extends I, ? extends D> table, StringBuilder out) {
        try {
            write(table, (Appendable) out);
        } catch (IOException ex) {
            throw new AssertionError("Writing to StringBuilder must not throw");
        }
    }

    @Override
    public void write(ObservationTable<? extends I, ? extends D> table, File file) throws IOException {
        try (BufferedWriter bw = new BufferedWriter(new FileWriter(file))) {
            write(table, bw);
        }
    }

}