com.avaje.ebean.text.PathPropertiesParser Maven / Gradle / Ivy
package com.avaje.ebean.text;
/**
* Parses Uri segments like :(id,name,shippingAddress(*),contacts(*)) so that
* the response can be customised for performance.
*
* @author rbygrave
*/
class PathPropertiesParser {
// :(a,b,c(d,e,f))
private final PathProperties pathProps;
private final String source;
private final char[] chars;
private final int eof;
private int pos;
private int startPos;
private PathProperties.Props currentPathProps;
/**
* Use {@link PathProperties#parse(String)}.
*/
static PathProperties parse(String source) {
return new PathPropertiesParser(source).pathProps;
}
private PathPropertiesParser(String src) {
if (src.startsWith(":")) {
src = src.substring(1);
}
this.pathProps = new PathProperties();
this.source = src;
this.chars = src.toCharArray();
this.eof = chars.length;
if (eof > 0) {
currentPathProps = pathProps.getRootProperties();
parse();
}
}
private String getPath() {
do {
char c1 = chars[pos++];
switch (c1) {
case '(':
return currentWord();
default:
if (pos == 1) {
return "";
}
}
} while (pos < eof);
throw new RuntimeException("Hit EOF while reading sectionTitle from " + startPos);
}
private void parse() {
do {
String path = getPath();
pushPath(path);
parseSection();
} while (pos < eof);
}
private void parseSection() {
if (pos < eof) {
do {
char c1 = chars[pos++];
switch (c1) {
case '(':
addSubpath();
break;
case ',':
addCurrentProperty();
break;
case ':':
// start new section
startPos = pos;
return;
case ')':
// end of section
addCurrentProperty();
popSubpath();
break;
default:
}
} while (pos < eof);
}
if (startPos < pos) {
String currentWord = source.substring(startPos, pos);
currentPathProps.addProperty(currentWord);
}
}
private void addSubpath() {
pushPath(currentWord());
}
private void addCurrentProperty() {
String w = currentWord();
if (!w.isEmpty()) {
currentPathProps.addProperty(w);
}
}
private String currentWord() {
if (startPos == pos) {
return "";
}
String currentWord = source.substring(startPos, pos - 1);
startPos = pos;
return currentWord;
}
private void pushPath(String title) {
if (!"".equals(title)) {
currentPathProps = currentPathProps.addChild(title);
}
}
private void popSubpath() {
currentPathProps = currentPathProps.getParent();
}
}