com.feilong.lib.ognl.ASTAnd Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of feilong Show documentation
Show all versions of feilong Show documentation
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 com.feilong.lib.ognl.enhance.ExpressionCompiler;
import com.feilong.lib.ognl.enhance.UnsupportedCompilationException;
/**
* @author Luke Blanshard ([email protected])
* @author Drew Davidson ([email protected])
*/
public class ASTAnd extends BooleanExpression{
/**
*
*/
private static final long serialVersionUID = 5143646722310582198L;
public ASTAnd(int id){
super(id);
}
public ASTAnd(OgnlParser p, int id){
super(p, id);
}
@Override
public void jjtClose(){
flattenTree();
}
@Override
protected Object getValueBody(OgnlContext context,Object source) throws OgnlException{
Object result = null;
int last = _children.length - 1;
for (int i = 0; i <= last; ++i){
result = _children[i].getValue(context, source);
if (i != last && !OgnlOps.booleanValue(result)){
break;
}
}
return result;
}
@Override
protected void setValueBody(OgnlContext context,Object target,Object value) throws OgnlException{
int last = _children.length - 1;
for (int i = 0; i < last; ++i){
Object v = _children[i].getValue(context, target);
if (!OgnlOps.booleanValue(v)){
return;
}
}
_children[last].setValue(context, target, value);
}
@Override
public String getExpressionOperator(int index){
return "&&";
}
@Override
public Class getGetterClass(){
return null;
}
@Override
public String toGetSourceString(OgnlContext context,Object target){
if (_children.length != 2){
throw new UnsupportedCompilationException("Can only compile boolean expressions with two children.");
}
String result = "";
try{
String first = OgnlRuntime.getChildSource(context, target, _children[0]);
if (!OgnlOps.booleanValue(context.getCurrentObject())){
throw new UnsupportedCompilationException("And expression can't be compiled until all conditions are true.");
}
if (!OgnlRuntime.isBoolean(first) && !context.getCurrentType().isPrimitive()){
first = OgnlRuntime.getCompiler().createLocalReference(context, first, context.getCurrentType());
}
String second = OgnlRuntime.getChildSource(context, target, _children[1]);
if (!OgnlRuntime.isBoolean(second) && !context.getCurrentType().isPrimitive()){
second = OgnlRuntime.getCompiler().createLocalReference(context, second, context.getCurrentType());
}
result += "(ognl.OgnlOps.booleanValue(" + first + ")";
result += " ? ";
result += " ($w) (" + second + ")";
result += " : ";
result += " ($w) (" + first + ")";
result += ")";
context.setCurrentObject(target);
context.setCurrentType(Object.class);
}catch (NullPointerException e){
throw new UnsupportedCompilationException("evaluation resulted in null expression.");
}catch (Throwable t){
throw OgnlOps.castToRuntime(t);
}
return result;
}
@Override
public String toSetSourceString(OgnlContext context,Object target){
if (_children.length != 2){
throw new UnsupportedCompilationException("Can only compile boolean expressions with two children.");
}
String pre = (String) context.get("_currentChain");
if (pre == null){
pre = "";
}
String result = "";
try{
if (!OgnlOps.booleanValue(_children[0].getValue(context, target))){
throw new UnsupportedCompilationException("And expression can't be compiled until all conditions are true.");
}
String first = ExpressionCompiler.getRootExpression(_children[0], context.getRoot(), context) + pre
+ _children[0].toGetSourceString(context, target);
_children[1].getValue(context, target);
String second = ExpressionCompiler.getRootExpression(_children[1], context.getRoot(), context) + pre
+ _children[1].toSetSourceString(context, target);
if (!OgnlRuntime.isBoolean(first)){
result += "if(ognl.OgnlOps.booleanValue(" + first + ")){";
}else{
result += "if(" + first + "){";
}
result += second;
result += "; } ";
context.setCurrentObject(target);
context.setCurrentType(Object.class);
}catch (Throwable t){
throw OgnlOps.castToRuntime(t);
}
return result;
}
}