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package net.sourceforge.akrogen.core.internal.code.properties;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
/**
* Extend java.util.Poperties to keep structure properties file
* (comments, order of property,...) when properties file is
* modifiy and saved.
*
* @version 1.0.3
* @author <a href="mailto:angelo.zerr@gmail.com">Angelo ZERR</a>
*
*/
public class ExtendedProperties extends Properties {
private static final long serialVersionUID = 1L;
private final static String NEW_LINE = "\r\n";
/**
* List which contains properties file content. This list contains :
* <ul>
* <li>String element which is the property key</li>
* <li>StringBuffer which contains another character (comments, space..)</li>
* </ul>
*/
private List contents;
public ExtendedProperties() {
contents = new ArrayList();
}
/**
* Load properties stream by caching structure of properties file structure
* (comments, property order)
*
* @param inputStream
* properties stream
* @exception IOException
*/
public void load(InputStream inputStream) throws IOException {
// The spec says that the file must be encoded using ISO-8859-1.
BufferedReader reader = new BufferedReader(new InputStreamReader(
inputStream, "ISO-8859-1"));
String line;
StringBuffer contentToAdd = null;
boolean lineWasAdded = false;
while ((line = reader.readLine()) != null) {
if (lineWasAdded) {
// Line was added, add new line string
addContent(NEW_LINE);
lineWasAdded = false;
}
char c = 0;
int pos = 0;
// Leading whitespaces must be deleted first.
while (pos < line.length()
&& Character.isWhitespace(c = line.charAt(pos))) {
// Character is whitespace
// Store into tempory StringBuffer content to add
if (contentToAdd == null)
contentToAdd = new StringBuffer();
contentToAdd.append(c);
pos++;
}
// If empty line or begins with a comment character, skip this
// line.
if ((line.length() - pos) == 0 || line.charAt(pos) == '#'
|| line.charAt(pos) == '!') {
// empty line or comment characters
// Store into tempory StringBuffer content to add
if (contentToAdd == null)
contentToAdd = new StringBuffer();
String content = line.substring(pos, line.length());
if (content != null && content.length() > 0) {
// Line is not empty, add content line
contentToAdd.append(content);
}
if (contentToAdd.toString().length() > 0)
// Content to add is not empty, add it
addContent(contentToAdd);
contentToAdd = null;
// new line String will be add on the next iteration
lineWasAdded = true;
continue;
}
// The characters up to the next Whitespace, ':', or '='
// describe the key. But look for escape sequences.
StringBuffer key = new StringBuffer();
while (pos < line.length()
&& !Character.isWhitespace(c = line.charAt(pos++))
&& c != '=' && c != ':') {
if (c == '\\') {
if (pos == line.length()) {
// The line continues on the next line. If there
// is no next line, just treat it as a key with an
// empty value.
line = reader.readLine();
if (line == null)
line = "";
pos = 0;
while (pos < line.length()
&& Character.isWhitespace(c = line.charAt(pos)))
pos++;
} else {
c = line.charAt(pos++);
switch (c) {
case 'n':
key.append('\n');
break;
case 't':
key.append('\t');
break;
case 'r':
key.append('\r');
break;
case 'u':
if (pos + 4 <= line.length()) {
char uni = (char) Integer.parseInt(line
.substring(pos, pos + 4), 16);
key.append(uni);
pos += 4;
} // else throw exception?
break;
default:
key.append(c);
break;
}
}
} else
key.append(c);
}
boolean isDelim = (c == ':' || c == '=');
while (pos < line.length()
&& Character.isWhitespace(c = line.charAt(pos)))
pos++;
if (!isDelim && (c == ':' || c == '=')) {
pos++;
while (pos < line.length()
&& Character.isWhitespace(c = line.charAt(pos)))
pos++;
}
StringBuffer element = new StringBuffer(line.length() - pos);
while (pos < line.length()) {
c = line.charAt(pos++);
if (c == '\\') {
if (pos == line.length()) {
// The line continues on the next line.
line = reader.readLine();
// We might have seen a backslash at the end of
// the file. The JDK ignores the backslash in
// this case, so we follow for compatibility.
if (line == null)
break;
pos = 0;
while (pos < line.length()
&& Character.isWhitespace(c = line.charAt(pos)))
pos++;
element.ensureCapacity(line.length() - pos
+ element.length());
} else {
c = line.charAt(pos++);
switch (c) {
case 'n':
element.append('\n');
break;
case 't':
element.append('\t');
break;
case 'r':
element.append('\r');
break;
case 'u':
if (pos + 4 <= line.length()) {
char uni = (char) Integer.parseInt(line
.substring(pos, pos + 4), 16);
element.append(uni);
pos += 4;
} // else throw exception?
break;
default:
element.append(c);
break;
}
}
} else
element.append(c);
}
put(key.toString(), element.toString());
addPropertKey(key.toString());
lineWasAdded = true;
}
}
public synchronized Object setProperty(String key, String value) {
if (get(key) == null) {
addContent("\r\n");
addPropertKey(key);
}
return put(key, value);
}
public synchronized void store(OutputStream out, String comments)
throws IOException {
// The spec says that the file must be encoded using ISO-8859-1.
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out,
"ISO-8859-1"));
store(writer, comments);
}
public synchronized void store(Writer writer, String comments)
throws IOException {
StringBuffer s = new StringBuffer(); // Reuse the same buffer.
for (Iterator iter = contents.iterator(); iter.hasNext();) {
Object element = iter.next();
if (element instanceof StringBuffer) {
writer.write(((StringBuffer) element).toString());
} else {
if (element instanceof String) {
String key = (String) element;
String value = (String) getProperty(key);
if (value != null) {
formatForOutput(key, s, true);
s.append('=');
formatForOutput(value, s, false);
writer.write(s.toString());
}
}
}
}
writer.flush();
}
private void addPropertKey(String key) {
contents.add(key);
}
private void addContent(String content) {
addContent(new StringBuffer(content));
}
private void addContent(StringBuffer content) {
contents.add(content);
}
/**
* Formats a key or value for output in a properties file. See store for a
* description of the format.
*
* @param str
* the string to format
* @param buffer
* the buffer to add it to
*
* @param key
* true if all ' ' must be escaped for the key, false if only
* leading spaces must be escaped for the value
* @see #store(OutputStream, String)
*/
private void formatForOutput(String str, StringBuffer buffer, boolean key) {
if (key) {
buffer.setLength(0);
buffer.ensureCapacity(str.length());
} else
buffer.ensureCapacity(buffer.length() + str.length());
boolean head = true;
int size = str.length();
for (int i = 0; i < size; i++) {
char c = str.charAt(i);
switch (c) {
case '\n':
buffer.append("\\n");
break;
case '\r':
buffer.append("\\r");
break;
case '\t':
buffer.append("\\t");
break;
case ' ':
buffer.append(head ? "\\ " : " ");
break;
case '\\':
case '!':
case '#':
case '=':
case ':':
buffer.append('\\').append(c);
break;
default:
if (c < ' ' || c > '~') {
String hex = Integer.toHexString(c);
buffer.append("\\u0000".substring(0, 6 - hex.length()));
buffer.append(hex);
} else
buffer.append(c);
}
if (c != ' ')
head = key;
}
}
} |
