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A simple framework for Java development. Simple is hard, Complex is easy. Better thinking, better design.

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/*******************************************************************************
 * Copyright  (c) 2013, 2023 James Mover Zhou
 *
 * 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 org.tinystruct.system.util;

import org.tinystruct.ApplicationException;

import java.io.*;

public class TextFileLoader {
    private File file;
    private InputStream inputStream;
    private String charsetName = "utf-8";

    public TextFileLoader() {
    }

    public TextFileLoader(File file) {
        this.file = file;
    }

    public TextFileLoader(String fileName) {
        this.file = new File(fileName);
    }

    public TextFileLoader(InputStream inputStream) {
        this.inputStream = inputStream;
    }

    public void setInputStream(InputStream inputStream) {
        this.inputStream = inputStream;
    }

    public void setCharset(String charsetName) {
        this.charsetName = charsetName;
    }

    public StringBuilder getContent() throws ApplicationException {
        StringBuilder content = new StringBuilder();
        if (this.file != null) {
            try (InputStream inputStream = new FileInputStream(this.file)) {
                read(inputStream, this.charsetName, content);
            } catch (FileNotFoundException e) {
                throw new ApplicationException(e.getMessage() + " - " + this.file.getAbsolutePath(), e);
            } catch (IOException e) {
                throw new ApplicationException(e.getMessage(), e);
            }
        } else if (this.inputStream != null) {
            read(this.inputStream, this.charsetName, content);
        }

        return content;
    }

    private void read(InputStream inputStream, String charsetName, StringBuilder content) throws ApplicationException {
        try (InputStreamReader reader = new InputStreamReader(inputStream, charsetName); BufferedReader bufferedReader = new BufferedReader(reader)) {
            String line, lineSeparator = System.getProperty("line.separator", "\r\n");
            while ((line = bufferedReader.readLine()) != null) {
                content.append(line).append(lineSeparator);
            }
        } catch (UnsupportedEncodingException e) {
            throw new ApplicationException(e.getMessage(), e);
        } catch (IOException e) {
            throw new ApplicationException(e.getMessage(), e);
        }
    }

    public String getFilePath() {
        return this.file.getPath();
    }

}