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Classes, interfaces and enums that assist with everyday Java development tasks.
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/*
 * Copyright 2010-2012 Craig S. Dickson (http://craigsdickson.com)
 *
 * 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 com.squeakysand.commons.io;

import com.squeakysand.commons.lang.NullParameterException;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.filefilter.WildcardFileFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * DOCUMENT ME!
 */
public final class FileHelper {

    private static final Logger LOG = LoggerFactory.getLogger(FileHelper.class);

    public static List findFilesByExtension(File searchDirectory, String extension) throws IOException {
        IOFileFilter filter = new WildcardFileFilter("*." + extension);
        FileFinder finder = new FileFinder(filter);
        return finder.findFiles(searchDirectory);
    }

    /**
     * DOCUMENT ME!
     * 
     * @param filePath DOCUMENT ME!
     * @return DOCUMENT ME!
     * @throws java.io.IOException DOCUMENT ME!
     */
    public static List readLines(String filePath) throws IOException {
        FileReader reader = new FileReader(filePath);
        BufferedReader in = new BufferedReader(reader);
        List lines = new ArrayList();
        String line = in.readLine();
        while (line != null) {
            lines.add(line);
            line = in.readLine();
        }
        in.close();
        return lines;
    }

    public static void writeFileToStream(File file, OutputStream outputStream) throws IOException {
        if (file == null) {
            throw new IllegalArgumentException("file cannot be null");
        }
        if (outputStream == null) {
            throw new IllegalArgumentException("outputStream cannot be null");
        }
        FileInputStream inputStream = new FileInputStream(file);
        StreamHelper.copyInputStreamToOutputStream(inputStream, outputStream);
    }

    public static void writeLines(String filePath, List lines) throws IOException {
        FileWriter writer = new FileWriter(filePath);
        BufferedWriter out = new BufferedWriter(writer);
        for (String line : lines) {
            out.write(line);
            out.newLine();
        }
        out.close();
    }

    public static void writeStreamToFile(File file, InputStream inputStream) throws IOException {
        if (file == null) {
            throw new NullParameterException("file");
        }
        if (inputStream == null) {
            throw new NullParameterException("inputStream");
        }
        FileOutputStream outputStream = new FileOutputStream(file);
        StreamHelper.copyInputStreamToOutputStream(inputStream, outputStream);
    }

    private FileHelper() {
    }

}