Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.io.EOFException;

import java.io.IOException;
import java.io.InputStream;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public class Main {
    public static Map<String, String> readStringStringMap(InputStream is) throws IOException {
        int size = readInt(is);
        Map<String, String> result = (size == 0) ? Collections.<String, String>emptyMap()
                : new HashMap<String, String>(size);
        for (int i = 0; i < size; i++) {
            String key = readString(is).intern();
            String value = readString(is).intern();
            result.put(key, value);
        }
        return result;
    }

    public static int readInt(InputStream is) throws IOException {
        int n = 0;
        n |= (read(is) << 0);
        n |= (read(is) << 8);
        n |= (read(is) << 16);
        n |= (read(is) << 24);
        return n;
    }

    public static String readString(InputStream is) throws IOException {
        int n = (int) readLong(is);
        byte[] b = streamToBytes(is, n);
        return new String(b, "UTF-8");
    }

    /**
     * Simple wrapper around {@link InputStream#read()} that throws EOFException
     * instead of returning -1.
     */
    public static int read(InputStream is) throws IOException {
        int b = is.read();
        if (b == -1) {
            throw new EOFException();
        }
        return b;
    }

    public static long readLong(InputStream is) throws IOException {
        long n = 0;
        n |= ((read(is) & 0xFFL) << 0);
        n |= ((read(is) & 0xFFL) << 8);
        n |= ((read(is) & 0xFFL) << 16);
        n |= ((read(is) & 0xFFL) << 24);
        n |= ((read(is) & 0xFFL) << 32);
        n |= ((read(is) & 0xFFL) << 40);
        n |= ((read(is) & 0xFFL) << 48);
        n |= ((read(is) & 0xFFL) << 56);
        return n;
    }

    /**
     * Reads the contents of an InputStream into a byte[].
     * */
    public static byte[] streamToBytes(InputStream in, int length) throws IOException {
        byte[] bytes = new byte[length];
        int count;
        int pos = 0;
        while (pos < length && ((count = in.read(bytes, pos, length - pos)) != -1)) {
            pos += count;
        }
        if (pos != length) {
            throw new IOException("Expected " + length + " bytes, read " + pos + " bytes");
        }
        return bytes;
    }
}