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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
// --------------------------------------------------------------------------
// Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// Neither the name of the Drew Davidson nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
// --------------------------------------------------------------------------
package com.feilong.lib.ognl;
import java.lang.reflect.Array;
import com.feilong.lib.ognl.enhance.ExpressionCompiler;
import com.feilong.lib.ognl.enhance.OrderedReturn;
import com.feilong.lib.ognl.enhance.UnsupportedCompilationException;
/**
* @author Luke Blanshard ([email protected])
* @author Drew Davidson ([email protected])
*/
public class ASTChain extends SimpleNode implements NodeType,OrderedReturn{
/**
*
*/
private static final long serialVersionUID = 8632726828720933079L;
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);
}
@Override
public String getLastExpression(){
return _lastExpression;
}
@Override
public String getCoreExpression(){
return _coreExpression;
}
@Override
public void jjtClose(){
flattenTree();
}
@Override
protected Object getValueBody(OgnlContext context,Object source) throws OgnlException{
Object result = source;
for (int i = 0, ilast = _children.length - 1; i <= ilast; ++i){
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 = new Integer((len > 0) ? 0 : -1);
break;
case DynamicSubscript.MID:
index = new Integer((len > 0) ? (len / 2) : -1);
break;
case DynamicSubscript.LAST:
index = new Integer((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;
}
@Override
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 (i <= ilast){
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 = new Integer((len > 0) ? 0 : -1);
break;
case DynamicSubscript.MID:
index = new Integer((len > 0) ? (len / 2) : -1);
break;
case DynamicSubscript.LAST:
index = new Integer((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);
}
}
@Override
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;
}
@Override
public Class getGetterClass(){
return _getterClass;
}
@Override
public Class getSetterClass(){
return _setterClass;
}
@Override
public String toString(){
String result = "";
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 = result + ".";
}
}
result += _children[i].toString();
}
}
return result;
}
@Override
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 (int i = 0; i < _children.length; i++){
/*
* System.out.println("astchain child: " + _children[i].getClass().getName()
* + " with current object target " + context.getCurrentObject()
* + " current type: " + context.getCurrentType());
*/
String value = _children[i].toGetSourceString(context, context.getCurrentObject());
// System.out.println("astchain child returned >> " + value + " <<");
if (ASTCtor.class.isInstance(_children[i])){
constructor = true;
}
if (NodeType.class.isInstance(_children[i]) && ((NodeType) _children[i]).getGetterClass() != null){
_lastType = (NodeType) _children[i];
}
// System.out.println("Astchain i: " + i + " currentobj : " + context.getCurrentObject() + " and root: " + context.getRoot());
if (!ASTVarRef.class.isInstance(_children[i]) && !constructor
&& !(OrderedReturn.class.isInstance(_children[i])
&& ((OrderedReturn) _children[i]).getLastExpression() != null)
&& (_parent == null || !ASTSequence.class.isInstance(_parent))){
value = OgnlRuntime.getCompiler().castExpression(context, _children[i], value);
}
/*
* System.out.println("astchain value now : " + value + " with index " + i
* + " current type " + context.getCurrentType() + " current accessor " + context.getCurrentAccessor()
* + " prev type " + context.getPreviousType() + " prev accessor " + context.getPreviousAccessor());
*/
if (OrderedReturn.class.isInstance(_children[i]) && ((OrderedReturn) _children[i]).getLastExpression() != null){
ordered = true;
OrderedReturn or = (OrderedReturn) _children[i];
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 (ASTOr.class.isInstance(_children[i]) || ASTAnd.class.isInstance(_children[i])
|| ASTCtor.class.isInstance(_children[i])
|| (ASTStaticField.class.isInstance(_children[i]) && _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;
}
@Override
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 (ASTConst.class.isInstance(_children[0])){
throw new UnsupportedCompilationException("Can't modify constant values.");
}
for (int i = 0; i < _children.length; i++){
// System.out.println("astchain setsource child[" + i + "] : " + _children[i].getClass().getName());
if (i == (_children.length - 1)){
context.put("_lastChild", "true");
}
String value = _children[i].toSetSourceString(context, context.getCurrentObject());
//if (value == null || value.trim().length() <= 0)
// return "";
// System.out.println("astchain setter child returned >> " + value + " <<");
if (ASTCtor.class.isInstance(_children[i])){
constructor = true;
}
if (NodeType.class.isInstance(_children[i]) && ((NodeType) _children[i]).getGetterClass() != null){
_lastType = (NodeType) _children[i];
}
if (!ASTVarRef.class.isInstance(_children[i]) && !constructor
&& !(OrderedReturn.class.isInstance(_children[i])
&& ((OrderedReturn) _children[i]).getLastExpression() != null)
&& (_parent == null || !ASTSequence.class.isInstance(_parent))){
value = OgnlRuntime.getCompiler().castExpression(context, _children[i], value);
}
// System.out.println("astchain setter after cast value is: " + value);
/*
* if (!constructor && !OrderedReturn.class.isInstance(_children[i])
* && (_parent == null || !ASTSequence.class.isInstance(_parent)))
* {
* value = OgnlRuntime.getCompiler().castExpression(context, _children[i], value);
* }
*/
if (ASTOr.class.isInstance(_children[i]) || ASTAnd.class.isInstance(_children[i])
|| ASTCtor.class.isInstance(_children[i]) || ASTStaticField.class.isInstance(_children[i])){
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;
}
}