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//--------------------------------------------------------------------------
//	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 ognl;

import ognl.enhance.ExpressionCompiler;
import ognl.enhance.UnsupportedCompilationException;

/**
 * @author Luke Blanshard ([email protected])
 * @author Drew Davidson ([email protected])
 */
public class ASTAnd extends BooleanExpression
{
    public ASTAnd(int id) {
        super(id);
    }

    public ASTAnd(OgnlParser p, int id) {
        super(p, id);
    }

    public void jjtClose() {
        flattenTree();
    }

    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;
    }

    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 );
    }

    public String getExpressionOperator(int index)
    {
        return "&&";
    }

    public Class getGetterClass()
    {
        return null;
    }

    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;
    }
    
    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;
    }
}