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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 org.apache.ibatis.ognl.enhance.OrderedReturn;
import org.apache.ibatis.ognl.enhance.UnsupportedCompilationException;
import java.lang.reflect.Array;
public class ASTChain extends SimpleNode implements NodeType, OrderedReturn {
private static final long serialVersionUID = 6689037266594707682L;
private final boolean shortCircuit = Boolean.parseBoolean(System.getProperty("org.apache.ibatis.ognl.chain.short-circuit", "true"));
private Class getterClass;
private Class setterClass;
private String lastExpression;
private String coreExpression;
public ASTChain(int id) {
super(id);
}
public ASTChain(OgnlParser p, int id) {
super(p, id);
}
public String getLastExpression() {
return lastExpression;
}
public String getCoreExpression() {
return coreExpression;
}
public void jjtClose() {
flattenTree();
}
protected Object getValueBody(OgnlContext context, Object source) throws OgnlException {
Object result = source;
// short-circuit the chain only in case if the root is null and this isn't IN operator
if (shortCircuit && result == null && !(parent instanceof ASTIn)) {
return null;
}
for (int i = 0, ilast = children.length - 1; i <= ilast; ++i) {
// short-circuit the chain only in case if the root is null and accessing property
if (shortCircuit && result == null && (children[i] instanceof ASTProperty)) {
return null;
}
boolean handled = false;
if (i < ilast) {
if (children[i] instanceof ASTProperty) {
ASTProperty propertyNode = (ASTProperty) children[i];
int indexType = propertyNode.getIndexedPropertyType(context, result);
if ((indexType != OgnlRuntime.INDEXED_PROPERTY_NONE) && (children[i + 1] instanceof ASTProperty)) {
ASTProperty indexNode = (ASTProperty) children[i + 1];
if (indexNode.isIndexedAccess()) {
Object index = indexNode.getProperty(context, result);
if (index instanceof DynamicSubscript) {
if (indexType == OgnlRuntime.INDEXED_PROPERTY_INT) {
Object array = propertyNode.getValue(context, result);
int len = Array.getLength(array);
switch (((DynamicSubscript) index).getFlag()) {
case DynamicSubscript.ALL:
result = Array.newInstance(array.getClass().getComponentType(), len);
System.arraycopy(array, 0, result, 0, len);
handled = true;
i++;
break;
case DynamicSubscript.FIRST:
index = (len > 0) ? 0 : -1;
break;
case DynamicSubscript.MID:
index = (len > 0) ? (len / 2) : -1;
break;
case DynamicSubscript.LAST:
index = (len > 0) ? (len - 1) : -1;
break;
}
} else {
if (indexType == OgnlRuntime.INDEXED_PROPERTY_OBJECT) {
throw new OgnlException(
"DynamicSubscript '" + indexNode
+ "' not allowed for object indexed property '" + propertyNode
+ "'");
}
}
}
if (!handled) {
result = OgnlRuntime.getIndexedProperty(context, result,
propertyNode.getProperty(context, result).toString(),
index);
handled = true;
i++;
}
}
}
}
}
if (!handled) {
result = children[i].getValue(context, result);
}
}
return result;
}
protected void setValueBody(OgnlContext context, Object target, Object value)
throws OgnlException {
boolean handled = false;
for (int i = 0, ilast = children.length - 2; i <= ilast; ++i) {
if (children[i] instanceof ASTProperty) {
ASTProperty propertyNode = (ASTProperty) children[i];
int indexType = propertyNode.getIndexedPropertyType(context, target);
if ((indexType != OgnlRuntime.INDEXED_PROPERTY_NONE) && (children[i + 1] instanceof ASTProperty)) {
ASTProperty indexNode = (ASTProperty) children[i + 1];
if (indexNode.isIndexedAccess()) {
Object index = indexNode.getProperty(context, target);
if (index instanceof DynamicSubscript) {
if (indexType == OgnlRuntime.INDEXED_PROPERTY_INT) {
Object array = propertyNode.getValue(context, target);
int len = Array.getLength(array);
switch (((DynamicSubscript) index).getFlag()) {
case DynamicSubscript.ALL:
System.arraycopy(target, 0, value, 0, len);
handled = true;
i++;
break;
case DynamicSubscript.FIRST:
index = (len > 0) ? 0 : -1;
break;
case DynamicSubscript.MID:
index = (len > 0) ? (len / 2) : -1;
break;
case DynamicSubscript.LAST:
index = (len > 0) ? (len - 1) : -1;
break;
}
} else {
if (indexType == OgnlRuntime.INDEXED_PROPERTY_OBJECT) {
throw new OgnlException("DynamicSubscript '" + indexNode
+ "' not allowed for object indexed property '" + propertyNode
+ "'");
}
}
}
if (!handled && i == ilast) {
OgnlRuntime.setIndexedProperty(context, target,
propertyNode.getProperty(context, target).toString(),
index, value);
handled = true;
i++;
} else if (!handled) {
target = OgnlRuntime.getIndexedProperty(context, target,
propertyNode.getProperty(context, target).toString(),
index);
i++;
continue;
}
}
}
}
if (!handled) {
target = children[i].getValue(context, target);
}
}
if (!handled) {
children[children.length - 1].setValue(context, target, value);
}
}
public boolean isSimpleNavigationChain(OgnlContext context)
throws OgnlException {
boolean result = false;
if ((children != null) && (children.length > 0)) {
result = true;
for (int i = 0; result && (i < children.length); i++) {
if (children[i] instanceof SimpleNode) {
result = ((SimpleNode) children[i]).isSimpleProperty(context);
} else {
result = false;
}
}
}
return result;
}
public Class getGetterClass() {
return getterClass;
}
public Class getSetterClass() {
return setterClass;
}
public String toString() {
StringBuilder result = new StringBuilder();
if ((children != null) && (children.length > 0)) {
for (int i = 0; i < children.length; i++) {
if (i > 0) {
if (!(children[i] instanceof ASTProperty) || !((ASTProperty) children[i]).isIndexedAccess()) {
result.append(".");
}
}
result.append(children[i].toString());
}
}
return result.toString();
}
public String toGetSourceString(OgnlContext context, Object target) {
String prevChain = (String) context.get("_currentChain");
if (target != null) {
context.setCurrentObject(target);
context.setCurrentType(target.getClass());
}
String result = "";
NodeType _lastType = null;
boolean ordered = false;
boolean constructor = false;
try {
if ((children != null) && (children.length > 0)) {
for (Node child : children) {
String value = child.toGetSourceString(context, context.getCurrentObject());
if (child instanceof ASTCtor)
constructor = true;
if (child instanceof NodeType
&& ((NodeType) child).getGetterClass() != null) {
_lastType = (NodeType) child;
}
if (!(child instanceof ASTVarRef) && !constructor
&& !(child instanceof OrderedReturn && ((OrderedReturn) child).getLastExpression() != null)
&& (!(parent instanceof ASTSequence))) {
value = OgnlRuntime.getCompiler().castExpression(context, child, value);
}
if (child instanceof OrderedReturn && ((OrderedReturn) child).getLastExpression() != null) {
ordered = true;
OrderedReturn or = (OrderedReturn) child;
if (or.getCoreExpression() == null || or.getCoreExpression().trim().length() <= 0)
result = "";
else
result += or.getCoreExpression();
lastExpression = or.getLastExpression();
if (context.get(ExpressionCompiler.PRE_CAST) != null) {
lastExpression = context.remove(ExpressionCompiler.PRE_CAST) + lastExpression;
}
} else if (child instanceof ASTOr
|| child instanceof ASTAnd
|| child instanceof ASTCtor
|| (child instanceof ASTStaticField && parent == null)) {
context.put("_noRoot", "true");
result = value;
} else {
result += value;
}
context.put("_currentChain", result);
}
}
} catch (Throwable t) {
throw OgnlOps.castToRuntime(t);
}
if (_lastType != null) {
getterClass = _lastType.getGetterClass();
setterClass = _lastType.getSetterClass();
}
if (ordered) {
coreExpression = result;
}
context.put("_currentChain", prevChain);
return result;
}
public String toSetSourceString(OgnlContext context, Object target) {
String prevChain = (String) context.get("_currentChain");
String prevChild = (String) context.get("_lastChild");
if (prevChain != null)
throw new UnsupportedCompilationException("Can't compile nested chain expressions.");
if (target != null) {
context.setCurrentObject(target);
context.setCurrentType(target.getClass());
}
String result = "";
NodeType _lastType = null;
boolean constructor = false;
try {
if ((children != null) && (children.length > 0)) {
if (children[0] instanceof ASTConst) {
throw new UnsupportedCompilationException("Can't modify constant values.");
}
for (int i = 0; i < children.length; i++) {
if (i == (children.length - 1)) {
context.put("_lastChild", "true");
}
String value = children[i].toSetSourceString(context, context.getCurrentObject());
if (children[i] instanceof ASTCtor)
constructor = true;
if (children[i] instanceof NodeType
&& ((NodeType) children[i]).getGetterClass() != null) {
_lastType = (NodeType) children[i];
}
if (!(children[i] instanceof ASTVarRef) && !constructor
&& !(children[i] instanceof OrderedReturn && ((OrderedReturn) children[i]).getLastExpression() != null)
&& (!(parent instanceof ASTSequence))) {
value = OgnlRuntime.getCompiler().castExpression(context, children[i], value);
}
if (children[i] instanceof ASTOr
|| children[i] instanceof ASTAnd
|| children[i] instanceof ASTCtor
|| children[i] instanceof ASTStaticField) {
context.put("_noRoot", "true");
result = value;
} else
result += value;
context.put("_currentChain", result);
}
}
} catch (Throwable t) {
throw OgnlOps.castToRuntime(t);
}
context.put("_lastChild", prevChild);
context.put("_currentChain", prevChain);
if (_lastType != null)
setterClass = _lastType.getSetterClass();
return result;
}
@Override
public boolean isChain(OgnlContext context) {
return true;
}
}
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