carbon.shell.console.jline.CarbonHistory.java Source code

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Here is the source code for carbon.shell.console.jline.CarbonHistory.java

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/*
*  Copyright (c) 2005-2014, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
*  WSO2 Inc. 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 carbon.shell.console.jline;

import jline.console.history.FileHistory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.File;
import java.io.IOException;
import java.io.Reader;

/**
 * Responsible of creating CarbonHistory file
 */
public class CarbonHistory extends FileHistory {
    private static Log LOGGER = LogFactory.getLog(CarbonHistory.class);
    boolean failed = false;
    boolean loading = false;

    /**
     * CarbonHistory constructor
     *
     * @param file
     * @throws IOException
     */
    public CarbonHistory(File file) throws IOException {
        super(file);
    }

    @Override
    public void add(CharSequence item) {
        if (!loading) {
            item = item.toString().replaceAll("\\!", "\\\\!");
        }
        super.add(item);
    }

    @Override
    public void load(Reader reader) throws IOException {
        loading = true;
        try {
            super.load(reader);
        } finally {
            loading = false;
        }
    }

    @Override
    public void flush() throws IOException {
        if (!failed) {
            try {
                super.flush();
            } catch (IOException e) {
                failed = true;
                LOGGER.debug("Could not write history file: " + getFile(), e);
            }
        }
    }

    @Override
    public void purge() throws IOException {
        if (!failed) {
            try {
                super.purge();
            } catch (IOException e) {
                failed = true;
                LOGGER.debug("Could not delete history file: " + getFile(), e);
            }
        }
    }
}