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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.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.ognl;
import org.apache.ibatis.ognl.enhance.ExpressionCompiler;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.util.List;
public class ASTCtor extends SimpleNode {
private static final long serialVersionUID = -218799350410195779L;
private String className;
private boolean isArray;
public ASTCtor(int id) {
super(id);
}
public ASTCtor(OgnlParser p, int id) {
super(p, id);
}
/**
* Called from parser action.
*/
void setClassName(String className) {
this.className = className;
}
Class getCreatedClass(OgnlContext context) throws ClassNotFoundException {
return OgnlRuntime.classForName(context, className);
}
void setArray(boolean value) {
isArray = value;
}
public boolean isArray() {
return isArray;
}
protected Object getValueBody(OgnlContext context, Object source)
throws OgnlException {
Object result, root = context.getRoot();
int count = jjtGetNumChildren();
Object[] args = new Object[count];
for (int i = 0; i < count; ++i) {
args[i] = children[i].getValue(context, root);
}
if (isArray) {
if (args.length == 1) {
try {
Class componentClass = OgnlRuntime.classForName(context, className);
List sourceList = null;
int size;
if (args[0] instanceof List) {
sourceList = (List) args[0];
size = sourceList.size();
} else {
size = (int) OgnlOps.longValue(args[0]);
}
result = Array.newInstance(componentClass, size);
if (sourceList != null) {
TypeConverter converter = context.getTypeConverter();
for (int i = 0, icount = sourceList.size(); i < icount; i++) {
Object o = sourceList.get(i);
if ((o == null) || componentClass.isInstance(o)) {
Array.set(result, i, o);
} else {
Array.set(result, i, converter.convertValue(context, null, null, null, o,
componentClass));
}
}
}
} catch (ClassNotFoundException ex) {
throw new OgnlException("array component class '" + className + "' not found", ex);
}
} else {
throw new OgnlException("only expect array size or fixed initializer list");
}
} else {
result = OgnlRuntime.callConstructor(context, className, args);
}
return result;
}
public String toString() {
StringBuilder result = new StringBuilder("new " + className);
if (isArray) {
if (children[0] instanceof ASTConst) {
result.append("[").append(children[0]).append("]");
} else {
result.append("[] ").append(children[0]);
}
} else {
result.append("(");
if ((children != null) && (children.length > 0)) {
for (int i = 0; i < children.length; i++) {
if (i > 0) {
result.append(", ");
}
result.append(children[i]);
}
}
result.append(")");
}
return result.toString();
}
public String toGetSourceString(OgnlContext context, Object target) {
StringBuilder result = new StringBuilder("new " + className);
Class clazz;
Object ctorValue;
try {
clazz = OgnlRuntime.classForName(context, className);
ctorValue = this.getValueBody(context, target);
context.setCurrentObject(ctorValue);
if (ctorValue != null) {
context.setCurrentType(ctorValue.getClass());
context.setCurrentAccessor(ctorValue.getClass());
}
if (isArray)
context.put("_ctorClass", clazz);
} catch (Throwable t) {
throw OgnlOps.castToRuntime(t);
}
try {
if (isArray) {
if (children[0] instanceof ASTConst) {
result.append("[").append(children[0].toGetSourceString(context, target)).append("]");
} else if (children[0] instanceof ASTProperty) {
result.append("[").append(ExpressionCompiler.getRootExpression(children[0], target, context)).append(children[0].toGetSourceString(context, target)).append("]");
} else if (children[0] instanceof ASTChain) {
result.append("[").append(children[0].toGetSourceString(context, target)).append("]");
} else {
result.append("[] ").append(children[0].toGetSourceString(context, target));
}
} else {
result.append("(");
if ((children != null) && (children.length > 0)) {
Object[] values = new Object[children.length];
String[] expressions = new String[children.length];
Class[] types = new Class[children.length];
// first populate arrays with child values
for (int i = 0; i < children.length; i++) {
Object objValue = children[i].getValue(context, context.getRoot());
String value = children[i].toGetSourceString(context, target);
if (!(children[i] instanceof ASTRootVarRef)) {
value = ExpressionCompiler.getRootExpression(children[i], target, context) + value;
}
String cast = "";
if (ExpressionCompiler.shouldCast(children[i])) {
cast = (String) context.remove(ExpressionCompiler.PRE_CAST);
}
if (cast == null)
cast = "";
if (!(children[i] instanceof ASTConst))
value = cast + value;
values[i] = objValue;
expressions[i] = value;
types[i] = context.getCurrentType();
}
// now try and find a matching constructor
Constructor[] cons = clazz.getConstructors();
Constructor ctor = null;
Class[] ctorParamTypes = null;
for (Constructor con : cons) {
Class[] ctorTypes = con.getParameterTypes();
if (OgnlRuntime.areArgsCompatible(values, ctorTypes)
&& (ctor == null || OgnlRuntime.isMoreSpecific(ctorTypes, ctorParamTypes))) {
ctor = con;
ctorParamTypes = ctorTypes;
}
}
if (ctor == null)
ctor = OgnlRuntime.getConvertedConstructorAndArgs(context, clazz, OgnlRuntime.getConstructors(clazz), values, new Object[values.length]);
if (ctor == null)
throw new NoSuchMethodException("Unable to find constructor appropriate for arguments in class: " + clazz);
ctorParamTypes = ctor.getParameterTypes();
// now loop over child values again and build up the actual source string
for (int i = 0; i < children.length; i++) {
if (i > 0) {
result.append(", ");
}
String value = expressions[i];
if (types[i].isPrimitive()) {
String literal = OgnlRuntime.getNumericLiteral(types[i]);
if (literal != null)
value += literal;
}
if (ctorParamTypes[i] != types[i]) {
if (values[i] != null && !types[i].isPrimitive()
&& !values[i].getClass().isArray() && !(children[i] instanceof ASTConst)) {
value = "(" + OgnlRuntime.getCompiler().getInterfaceClass(values[i].getClass()).getName() + ")" + value;
} else if (!(children[i] instanceof ASTConst)
|| (children[i] instanceof ASTConst && !types[i].isPrimitive())) {
if (!types[i].isArray()
&& types[i].isPrimitive() && !ctorParamTypes[i].isPrimitive())
value = "new " + ExpressionCompiler.getCastString(OgnlRuntime.getPrimitiveWrapperClass(types[i])) + "(" + value + ")";
else
value = " ($w) " + value;
}
}
result.append(value);
}
}
result.append(")");
}
context.setCurrentType(ctorValue != null ? ctorValue.getClass() : clazz);
context.setCurrentAccessor(clazz);
context.setCurrentObject(ctorValue);
} catch (Throwable t) {
throw OgnlOps.castToRuntime(t);
}
context.remove("_ctorClass");
return result.toString();
}
public String toSetSourceString(OgnlContext context, Object target) {
return "";
}
}
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