/*
 * 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.maven.scm.provider.git.gitexe.command;

import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.maven.scm.ScmFile;
import org.apache.maven.scm.util.AbstractConsumer;

/**
 * @author <a href="mailto:kenney@apache.org">Kenney Westerhof</a>
 * @author Olivier Lamy
 */
public abstract class AbstractFileCheckingConsumer extends AbstractConsumer {
    protected File workingDirectory;

    private final List<ScmFile> files = new ArrayList<>();

    protected int revision;

    private boolean filtered;

    public AbstractFileCheckingConsumer(File workingDirectory) {
        this.workingDirectory = workingDirectory;
    }

    /**
     * {@inheritDoc}
     */
    public final void consumeLine(String line) {
        if (line.length() <= 3) {
            return;
        }

        if (logger.isDebugEnabled()) {
            logger.debug(line);
        }

        parseLine(line);
    }

    protected abstract void parseLine(String line);

    protected List<ScmFile> getFiles() {
        if (!filtered) {
            for (Iterator<ScmFile> it = files.iterator(); it.hasNext(); ) {
                if (!new File(workingDirectory, it.next().getPath()).isFile()) {
                    it.remove();
                }
            }

            filtered = true;
        }

        return files;
    }

    protected final int parseInt(String revisionString) {
        try {
            return Integer.parseInt(revisionString);
        } catch (NumberFormatException ex) {
            return 0;
        }
    }

    protected void addFile(ScmFile file) {
        files.add(file);
    }

    public final int getRevision() {
        return revision;
    }
}
