Java Properties Load from InputStream loadProperties(InputStream inputStream)

Description

load Properties

License

Apache License

Declaration

public static Properties loadProperties(InputStream inputStream) throws IOException

Method Source Code


//package com.java2s;
/*//from   w  w  w. j  a  v a2 s .c  om
 * 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.
 */

import java.io.BufferedReader;

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

import java.util.Properties;

public class Main {
    private static final String keyValueSeparators = "=: \t\r\n\f";
    private static final String strictKeyValueSeparators = "=:";
    private static final String whiteSpaceChars = " \t\r\n\f";

    public static Properties loadProperties(InputStream inputStream) throws IOException {
        Properties properties = new Properties();
        BufferedReader in = new BufferedReader(new InputStreamReader(inputStream));
        while (true) {
            // Get next line
            String line = in.readLine();
            if (line == null)
                return properties;

            if (line.length() > 0) {

                // Find start of key
                int len = line.length();
                int keyStart;
                for (keyStart = 0; keyStart < len; keyStart++)
                    if (whiteSpaceChars.indexOf(line.charAt(keyStart)) == -1)
                        break;

                // Blank lines are ignored
                if (keyStart == len)
                    continue;

                // Continue lines that end in slashes if they are not comments
                char firstChar = line.charAt(keyStart);
                if ((firstChar != '#') && (firstChar != '!')) {
                    while (continueLine(line)) {
                        String nextLine = in.readLine();
                        if (nextLine == null)
                            nextLine = "";
                        String loppedLine = line.substring(0, len - 1);
                        // Advance beyond whitespace on new line
                        int startIndex;
                        for (startIndex = 0; startIndex < nextLine.length(); startIndex++)
                            if (whiteSpaceChars.indexOf(nextLine.charAt(startIndex)) == -1)
                                break;
                        nextLine = nextLine.substring(startIndex, nextLine.length());
                        line = loppedLine + nextLine;
                        len = line.length();
                    }

                    // Find separation between key and value
                    int separatorIndex;
                    for (separatorIndex = keyStart; separatorIndex < len; separatorIndex++) {
                        char currentChar = line.charAt(separatorIndex);
                        if (currentChar == '\\')
                            separatorIndex++;
                        else if (keyValueSeparators.indexOf(currentChar) != -1)
                            break;
                    }

                    // Skip over whitespace after key if any
                    int valueIndex;
                    for (valueIndex = separatorIndex; valueIndex < len; valueIndex++)
                        if (whiteSpaceChars.indexOf(line.charAt(valueIndex)) == -1)
                            break;

                    // Skip over one non whitespace key value separators if any
                    if (valueIndex < len)
                        if (strictKeyValueSeparators.indexOf(line.charAt(valueIndex)) != -1)
                            valueIndex++;

                    // Skip over white space after other separators if any
                    while (valueIndex < len) {
                        if (whiteSpaceChars.indexOf(line.charAt(valueIndex)) == -1)
                            break;
                        valueIndex++;
                    }
                    String key = line.substring(keyStart, separatorIndex);
                    String value = (separatorIndex < len) ? line.substring(valueIndex, len) : "";

                    // Convert then store key and value
                    key = loadConvert(key);
                    value = loadConvert(value);
                    properties.setProperty(key, value);
                }
            }
        }
    }

    private static boolean continueLine(String line) {
        int slashCount = 0;
        int index = line.length() - 1;
        while ((index >= 0) && (line.charAt(index--) == '\\'))
            slashCount++;
        return (slashCount % 2 != 0);
    }

    private static String loadConvert(String theString) {
        char aChar;
        int len = theString.length();
        StringBuffer outBuffer = new StringBuffer(len);

        for (int x = 0; x < len;) {
            aChar = theString.charAt(x++);
            if (aChar == '\\') {
                aChar = theString.charAt(x++);
                if (aChar == 'u') {
                    // Read the xxxx
                    int value = 0;
                    for (int i = 0; i < 4; i++) {
                        aChar = theString.charAt(x++);
                        switch (aChar) {
                        case '0':
                        case '1':
                        case '2':
                        case '3':
                        case '4':
                        case '5':
                        case '6':
                        case '7':
                        case '8':
                        case '9':
                            value = (value << 4) + aChar - '0';
                            break;
                        case 'a':
                        case 'b':
                        case 'c':
                        case 'd':
                        case 'e':
                        case 'f':
                            value = (value << 4) + 10 + aChar - 'a';
                            break;
                        case 'A':
                        case 'B':
                        case 'C':
                        case 'D':
                        case 'E':
                        case 'F':
                            value = (value << 4) + 10 + aChar - 'A';
                            break;
                        default:
                            throw new IllegalArgumentException("Malformed \\uxxxx encoding.");
                        }
                    }
                    outBuffer.append((char) value);
                } else {
                    if (aChar == 't')
                        aChar = '\t';
                    else if (aChar == 'r')
                        aChar = '\r';
                    else if (aChar == 'n')
                        aChar = '\n';
                    else if (aChar == 'f')
                        aChar = '\f';
                    outBuffer.append(aChar);
                }
            } else
                outBuffer.append(aChar);
        }
        return outBuffer.toString();
    }
}

Java Properties Load from InputStream loadProperties(InputStream inputStream)

Description

License

Declaration

Method Source Code

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