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The MyBatis SQL mapper framework makes it easier to use a relational database with object-oriented applications. MyBatis couples objects with stored procedures or SQL statements using a XML descriptor or annotations. Simplicity is the biggest advantage of the MyBatis data mapper over object relational mapping tools.

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/*
 * Copyright 2012-2013 MyBatis.org.
 *
 * 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):
 * 
 * 
 * inline-parameter = (propertyName | expression) oldJdbcType attributes
 * propertyName = /expression language's property navigation path/
 * expression = '(' /expression language's expression/ ')'
 * oldJdbcType = ':' /any valid jdbc type/
 * attributes = (',' attribute)*
 * attribute = name '=' value
 * 
*/ /** * @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 {" + new String(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 {" + new String(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); } }




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