alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Android example source code file (IOUtil.java)

This example Android source code file (IOUtil.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

io, ioexception, ioutil, string, stringbuilder

The IOUtil.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * 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 android.core;

import java.io.InputStream;
import java.io.IOException;
import java.io.Reader;
import java.io.InputStreamReader;

public final class IOUtil {

    private IOUtil() {
    }

    /**
     * returns the content of an InputStream as a String.
     *
     * @param a the input stream.
     * @return the string
     * @throws java.io.IOException
     */
    public static String read(InputStream a) throws IOException {
        int r;
        StringBuilder builder = new StringBuilder();
        do {
            r = a.read();
            if (r != -1)
                builder.append((char) r);
        } while (r != -1);
        return builder.toString();
    }

    /**
     * reads characters from a reader and returns them as a string.
     *
     * @param a the reader.
     * @return the string.
     * @throws IOException
     */
    public static String read(Reader a) throws IOException {
        int r;
        StringBuilder builder = new StringBuilder();
        do {
            r = a.read();
            if (r != -1)
                builder.append((char) r);
        } while (r != -1);
        return builder.toString();
    }

    /**
     * returns the content of an InputStream as a String. It reads x characters.
     *
     * @param a the input stream.
     * @param x number of characters to read.
     * @return the string
     * @throws IOException
     */
    public static String read(InputStream a, int x) throws IOException {
        byte[] b = new byte[x];
        int len = a.read(b, 0, x);
        if (len < 0) {
            return "";
        }
        return new String(b, 0, len);
    }

    /**
     * reads a number of characters from a reader and returns them as a string.
     *
     * @param a the reader.
     * @param x the number of characters to read.
     * @return the string.
     * @throws IOException
     */
    public static String read(Reader a, int x) throws IOException {
        char[] b = new char[x];
        int len = a.read(b, 0, x);
        if (len < 0) {
            return "";
        }
        return new String(b, 0, len);
    }

    /**
     * returns the content of the input stream as a String. It only appends
     * every second character.
     *
     * @param a the input stream.
     * @return the string created from every second character of the input stream.
     * @throws IOException
     */
    public static String skipRead(InputStream a) throws IOException {
        int r;
        StringBuilder builder = new StringBuilder();
        do {
            a.skip(1);
            r = a.read();
            if (r != -1)
                builder.append((char) r);
        } while (r != -1);
        return builder.toString();
    }

    /**
     * reads every second characters from a reader and returns them as a string.
     *
     * @param a the reader.
     * @return the string.
     * @throws IOException
     */
    public static String skipRead(Reader a) throws IOException {
        int r;
        StringBuilder builder = new StringBuilder();
        do {
            a.skip(1);
            r = a.read();
            if (r != -1)
                builder.append((char) r);
        } while (r != -1);
        return builder.toString();
    }

    /**
     * reads characters from a InputStream, skips back y characters and continues
     * reading from that new position up to the end.
     *
     * @param a the InputStream.
     * @param x the position of the mark. the marks position is x+y
     * @param y the number of characters to jump back after the position x+y was reached.
     * @return the string.
     * @throws IOException
     */
    public static String markRead(InputStream a, int x, int y) throws IOException {
        int m = 0;
        int r;
        StringBuilder builder = new StringBuilder();
        do {
            m++;
            r = a.read();
            if (m == x)
                a.mark((x + y));
            if (m == (x + y))
                a.reset();

            if (r != -1)
                builder.append((char) r);
        } while (r != -1);
        return builder.toString();
    }

    /**
     * reads characters from a reader, skips back y characters and continues
     * reading from that new position up to the end.
     *
     * @param a the reader.
     * @param x the position of the mark. the marks position is x+y
     * @param y the number of characters to jump back after the position x+y was reached.
     * @return the string.
     * @throws IOException
     */
    public static String markRead(Reader a, int x, int y) throws IOException {
        int m = 0;
        int r;
        StringBuilder builder = new StringBuilder();
        do {
            m++;
            r = a.read();
            if (m == x)
                a.mark((x + y));
            if (m == (x + y))
                a.reset();

            if (r != -1)
                builder.append((char) r);
        } while (r != -1);
        return builder.toString();
    }
}

Other Android examples (source code examples)

Here is a short list of links related to this Android IOUtil.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.