/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.shell.terminal;

import java.io.PrintStream;
import java.nio.file.Path;
import org.neo4j.shell.Historian;

/**
 * Fallback implementation of CypherShellTerminal that only supports writing.
 */
public class WriteOnlyCypherShellTerminal implements CypherShellTerminal {
    private final PrintStream out;
    private final Writer writer;

    public WriteOnlyCypherShellTerminal(PrintStream out) {
        this.out = out;
        this.writer = new ReadOnlyWriter();
    }

    @Override
    public Reader read() {
        throw new UnsupportedOperationException("Could not read input");
    }

    @Override
    public SimplePrompt simplePrompt() {
        throw new UnsupportedOperationException("Could not read input");
    }

    @Override
    public Writer write() {
        return writer;
    }

    @Override
    public boolean isInteractive() {
        return false;
    }

    @Override
    public Historian getHistory() {
        return Historian.empty;
    }

    @Override
    public void setHistoryFile(Path file) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void bindUserInterruptHandler(UserInterruptHandler handler) {
        throw new UnsupportedOperationException();
    }

    private class ReadOnlyWriter implements Writer {
        @Override
        public void println(String line) {
            out.println(line);
        }
    }
}
