/*
 * 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.karaf.shell.impl.console;

import org.apache.karaf.shell.api.console.History;

import java.io.IOException;
import java.io.UncheckedIOException;

public class HistoryWrapper implements History {

    private final org.jline.reader.History history;

    public HistoryWrapper(org.jline.reader.History history) {
        this.history = history;
    }

    @Override
    public void clear() {
        try {
            history.purge();
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }

    public int first() {
        return history.iterator().next().index() + 1;
    }

    public int last() {
        return first() + history.size() - 1;
    }

    @Override
    public CharSequence get(int index) {
        return history.get(index - 1);
    }
}
