com.avaje.ebeaninternal.server.deploy.DeployParser Maven / Gradle / Ivy
package com.avaje.ebeaninternal.server.deploy;
import java.util.Set;
/**
* Converts logical property names to database columns.
*/
public abstract class DeployParser {
/**
* used to identify sql literal.
*/
protected static final char SINGLE_QUOTE = '\'';
/**
* used to identify query named parameters.
*/
protected static final char COLON = ':';
/**
* Used to determine when a column name terminates.
*/
protected static final char UNDERSCORE = '_';
/**
* Used to determine when a column name terminates.
*/
protected static final char PERIOD = '.';
protected boolean encrypted;
protected String source;
protected StringBuilder sb;
protected int sourceLength;
protected int pos;
protected String word;
protected char wordTerminator;
protected abstract String convertWord();
public abstract String getDeployWord(String expression);
/**
* Return the join includes.
*/
public abstract Set getIncludes();
public void setEncrypted(boolean encrytped) {
this.encrypted = encrytped;
}
public String parse(String source) {
if (source == null) {
return source;
}
pos = -1;
this.source = source;
this.sourceLength = source.length();
this.sb = new StringBuilder(source.length() + 20);
while (nextWord()) {
String deployWord = convertWord();
sb.append(deployWord);
if (pos < sourceLength) {
sb.append(wordTerminator);
if (wordTerminator == SINGLE_QUOTE) {
readLiteral();
}
}
}
return sb.toString();
}
private boolean nextWord() {
if (!findWordStart()) {
return false;
}
StringBuilder wordBuffer = new StringBuilder();
wordBuffer.append(source.charAt(pos));
while (++pos < sourceLength) {
char ch = source.charAt(pos);
if (isWordPart(ch)) {
wordBuffer.append(ch);
} else {
wordTerminator = ch;
break;
}
}
word = wordBuffer.toString();
return true;
}
private boolean findWordStart() {
while (++pos < sourceLength) {
char ch = source.charAt(pos);
if (ch == SINGLE_QUOTE) {
// read a literal value and just
// append to string builder
sb.append(ch);
readLiteral();
} else if (ch == COLON) {
// read a named parameter
// just append to string builder
sb.append(ch);
readNamedParameter();
} else if (isWordStart(ch)) {
// its the start of a word that could
// be translated
return true;
} else {
sb.append(ch);
}
}
return false;
}
/**
* Read the rest of a literal value. These do not get translated so are just
* read and appended to the string builder.
*/
private void readLiteral() {
while (++pos < sourceLength) {
char ch = source.charAt(pos);
sb.append(ch);
if (ch == SINGLE_QUOTE) {
break;
}
}
}
/**
* Read a named parameter. These are not translated. They will be replaced
* by positioned parameters later.
*/
private void readNamedParameter() {
while (++pos < sourceLength) {
char ch = source.charAt(pos);
sb.append(ch);
if (Character.isWhitespace(ch)) {
break;
} else if (ch == ',') {
break;
}
}
}
/**
* return true if the char is a letter, digit or underscore.
*/
private boolean isWordPart(char ch) {
return Character.isLetterOrDigit(ch) || ch == UNDERSCORE || ch == PERIOD;
}
private boolean isWordStart(char ch) {
return Character.isLetter(ch);
}
}