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/**
* Copyright 2009-2016 the original author or authors.
*
* Licensed 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.
*/
package org.apache.ibatis.builder;
import java.util.HashMap;
/**
* Inline parameter expression parser. Supported grammar (simplified):
*
*
*
* @author Frank D. Martinez [mnesarco]
*/
public class ParameterExpression extends HashMap {
private static final long serialVersionUID = -2417552199605158680L;
public ParameterExpression(String expression) {
parse(expression);
}
private void parse(String expression) {
int p = skipWS(expression, 0);
if (expression.charAt(p) == '(') {
expression(expression, p + 1);
} else {
property(expression, p);
}
}
private void expression(String expression, int left) {
int match = 1;
int right = left + 1;
while (match > 0) {
if (expression.charAt(right) == ')') {
match--;
} else if (expression.charAt(right) == '(') {
match++;
}
right++;
}
put("expression", expression.substring(left, right - 1));
jdbcTypeOpt(expression, right);
}
private void property(String expression, int left) {
if (left < expression.length()) {
int right = skipUntil(expression, left, ",:");
put("property", trimmedStr(expression, left, right));
jdbcTypeOpt(expression, right);
}
}
private int skipWS(String expression, int p) {
for (int i = p; i < expression.length(); i++) {
if (expression.charAt(i) > 0x20) {
return i;
}
}
return expression.length();
}
private int skipUntil(String expression, int p, final String endChars) {
for (int i = p; i < expression.length(); i++) {
char c = expression.charAt(i);
if (endChars.indexOf(c) > -1) {
return i;
}
}
return expression.length();
}
private void jdbcTypeOpt(String expression, int p) {
p = skipWS(expression, p);
if (p < expression.length()) {
if (expression.charAt(p) == ':') {
jdbcType(expression, p + 1);
} else if (expression.charAt(p) == ',') {
option(expression, p + 1);
} else {
throw new BuilderException("Parsing error in {" + expression + "} in position " + p);
}
}
}
private void jdbcType(String expression, int p) {
int left = skipWS(expression, p);
int right = skipUntil(expression, left, ",");
if (right > left) {
put("jdbcType", trimmedStr(expression, left, right));
} else {
throw new BuilderException("Parsing error in {" + expression + "} in position " + p);
}
option(expression, right + 1);
}
private void option(String expression, int p) {
int left = skipWS(expression, p);
if (left < expression.length()) {
int right = skipUntil(expression, left, "=");
String name = trimmedStr(expression, left, right);
left = right + 1;
right = skipUntil(expression, left, ",");
String value = trimmedStr(expression, left, right);
put(name, value);
option(expression, right + 1);
}
}
private String trimmedStr(String str, int start, int end) {
while (str.charAt(start) <= 0x20) {
start++;
}
while (str.charAt(end - 1) <= 0x20) {
end--;
}
return start >= end ? "" : str.substring(start, end);
}
}
