com.aegisql.conveyor.config.OrderedProperties Maven / Gradle / Ivy
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Conveyor Configurator and Factory
package com.aegisql.conveyor.config;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.LinkedList;
// TODO: Auto-generated Javadoc
/**
* Loader is a copy of original Java8 Properties class with LinkedList support and removed XML and write support.
*
* @author Arthur van Hoff
* @author Michael McCloskey
* @author Xueming Shen
* @author Mikhail Teplitskiy
*/
class OrderedProperties extends LinkedList> {
/** The Constant serialVersionUID. */
private static final long serialVersionUID = 1L;
/**
* Creates an empty property list with no default values.
*/
public OrderedProperties() {
super();
}
/**
* Adds the property.
*
* @param key the key
* @param value the value
* @return the object
*/
public synchronized Object addProperty(String key, String value) {
return add(new Pair(key, value));
}
/**
* Load.
*
* @param file the file
* @throws IOException Signals that an I/O exception has occurred.
*/
public synchronized void load(String file) throws IOException {
load0(new LineReader(new FileReader(file)));
}
/**
* Load.
*
* @param reader the reader
* @throws IOException Signals that an I/O exception has occurred.
*/
public synchronized void load(Reader reader) throws IOException {
load0(new LineReader(reader));
}
/**
* Load.
*
* @param inStream the in stream
* @throws IOException Signals that an I/O exception has occurred.
*/
public synchronized void load(InputStream inStream) throws IOException {
load0(new LineReader(inStream));
}
/**
* Load 0.
*
* @param lr the lr
* @throws IOException Signals that an I/O exception has occurred.
*/
private void load0 (LineReader lr) throws IOException {
char[] convtBuf = new char[1024];
int limit;
int keyLen;
int valueStart;
char c;
boolean hasSep;
boolean precedingBackslash;
while ((limit = lr.readLine()) >= 0) {
c = 0;
keyLen = 0;
valueStart = limit;
hasSep = false;
precedingBackslash = false;
while (keyLen < limit) {
c = lr.lineBuf[keyLen];
//need check if escaped.
if ((c == '=' || c == ':') && !precedingBackslash) {
valueStart = keyLen + 1;
hasSep = true;
break;
} else if ((c == ' ' || c == '\t' || c == '\f') && !precedingBackslash) {
valueStart = keyLen + 1;
break;
}
if (c == '\\') {
precedingBackslash = !precedingBackslash;
} else {
precedingBackslash = false;
}
keyLen++;
}
while (valueStart < limit) {
c = lr.lineBuf[valueStart];
if (c != ' ' && c != '\t' && c != '\f') {
if (!hasSep && (c == '=' || c == ':')) {
hasSep = true;
} else {
break;
}
}
valueStart++;
}
String key = loadConvert(lr.lineBuf, 0, keyLen, convtBuf);
String value = loadConvert(lr.lineBuf, valueStart, limit - valueStart, convtBuf);
add(new Pair(key, value));
}
}
/**
* The Class LineReader.
*/
/* Read in a "logical line" from an InputStream/Reader, skip all comment
* and blank lines and filter out those leading whitespace characters
* (\u0020, \u0009 and \u000c) from the beginning of a "natural line".
* Method returns the char length of the "logical line" and stores
* the line in "lineBuf".
*/
class LineReader {
/**
* Instantiates a new line reader.
*
* @param inStream the in stream
*/
public LineReader(InputStream inStream) {
this.inStream = inStream;
inByteBuf = new byte[8192];
}
/**
* Instantiates a new line reader.
*
* @param reader the reader
*/
public LineReader(Reader reader) {
this.reader = reader;
inCharBuf = new char[8192];
}
/** The in byte buf. */
byte[] inByteBuf;
/** The in char buf. */
char[] inCharBuf;
/** The line buf. */
char[] lineBuf = new char[1024];
/** The in limit. */
int inLimit = 0;
/** The in off. */
int inOff = 0;
/** The in stream. */
InputStream inStream;
/** The reader. */
Reader reader;
/**
* Read line.
*
* @return the int
* @throws IOException Signals that an I/O exception has occurred.
*/
int readLine() throws IOException {
int len = 0;
char c = 0;
boolean skipWhiteSpace = true;
boolean isCommentLine = false;
boolean isNewLine = true;
boolean appendedLineBegin = false;
boolean precedingBackslash = false;
boolean skipLF = false;
while (true) {
if (inOff >= inLimit) {
inLimit = (inStream==null)?reader.read(inCharBuf)
:inStream.read(inByteBuf);
inOff = 0;
if (inLimit <= 0) {
if (len == 0 || isCommentLine) {
return -1;
}
if (precedingBackslash) {
len--;
}
return len;
}
}
if (inStream != null) {
//The line below is equivalent to calling a
//ISO8859-1 decoder.
c = (char) (0xff & inByteBuf[inOff++]);
} else {
c = inCharBuf[inOff++];
}
if (skipLF) {
skipLF = false;
if (c == '\n') {
continue;
}
}
if (skipWhiteSpace) {
if (c == ' ' || c == '\t' || c == '\f') {
continue;
}
if (!appendedLineBegin && (c == '\r' || c == '\n')) {
continue;
}
skipWhiteSpace = false;
appendedLineBegin = false;
}
if (isNewLine) {
isNewLine = false;
if (c == '#' || c == '!') {
isCommentLine = true;
continue;
}
}
if (c != '\n' && c != '\r') {
lineBuf[len++] = c;
if (len == lineBuf.length) {
int newLength = lineBuf.length * 2;
if (newLength < 0) {
newLength = Integer.MAX_VALUE;
}
char[] buf = new char[newLength];
System.arraycopy(lineBuf, 0, buf, 0, lineBuf.length);
lineBuf = buf;
}
//flip the preceding backslash flag
if (c == '\\') {
precedingBackslash = !precedingBackslash;
} else {
precedingBackslash = false;
}
}
else {
// reached EOL
if (isCommentLine || len == 0) {
isCommentLine = false;
isNewLine = true;
skipWhiteSpace = true;
len = 0;
continue;
}
if (inOff >= inLimit) {
inLimit = (inStream==null)
?reader.read(inCharBuf)
:inStream.read(inByteBuf);
inOff = 0;
if (inLimit <= 0) {
if (precedingBackslash) {
len--;
}
return len;
}
}
if (precedingBackslash) {
len -= 1;
//skip the leading whitespace characters in following line
skipWhiteSpace = true;
appendedLineBegin = true;
precedingBackslash = false;
if (c == '\r') {
skipLF = true;
}
} else {
return len;
}
}
}
}
}
/**
* Load convert.
*
* @param in the in
* @param off the off
* @param len the len
* @param convtBuf the convt buf
* @return the string
*/
/*
* Converts encoded \uxxxx to unicode chars
* and changes special saved chars to their original forms
*/
private String loadConvert (char[] in, int off, int len, char[] convtBuf) {
if (convtBuf.length < len) {
int newLen = len * 2;
if (newLen < 0) {
newLen = Integer.MAX_VALUE;
}
convtBuf = new char[newLen];
}
char aChar;
char[] out = convtBuf;
int outLen = 0;
int end = off + len;
while (off < end) {
aChar = in[off++];
if (aChar == '\\') {
aChar = in[off++];
if(aChar == 'u') {
// Read the xxxx
int value=0;
for (int i=0; i<4; i++) {
aChar = in[off++];
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.");
}
}
out[outLen++] = (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';
out[outLen++] = aChar;
}
} else {
out[outLen++] = aChar;
}
}
return new String (out, 0, outLen);
}
}
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