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/**
 * 
 */
package com.feilong.lib.ognl;

import com.feilong.lib.ognl.enhance.ExpressionCompiler;

/**
 * Base class for numeric expressions.
 */
public abstract class NumericExpression extends ExpressionNode implements NodeType{

    /**
     * 
     */
    private static final long serialVersionUID = -6526768565100257087L;

    protected Class           _getterClass;

    public NumericExpression(int id){
        super(id);
    }

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

    @Override
    public Class getGetterClass(){
        if (_getterClass != null){
            return _getterClass;
        }

        return Double.TYPE;
    }

    @Override
    public Class getSetterClass(){
        return null;
    }

    @Override
    public String toGetSourceString(OgnlContext context,Object target){
        Object value = null;
        String result = "";

        try{

            value = getValueBody(context, target);

            if (value != null){
                _getterClass = value.getClass();
            }

            for (int i = 0; i < _children.length; i++){
                if (i > 0){
                    result += " " + getExpressionOperator(i) + " ";
                }

                String str = OgnlRuntime.getChildSource(context, target, _children[i]);

                result += coerceToNumeric(str, context, _children[i]);
            }

        }catch (Throwable t){
            throw OgnlOps.castToRuntime(t);
        }

        return result;
    }

    public String coerceToNumeric(String source,OgnlContext context,Node child){
        String ret = source;
        Object value = context.getCurrentObject();

        if (ASTConst.class.isInstance(child) && value != null){
            return value.toString();
        }

        if (context.getCurrentType() != null && !context.getCurrentType().isPrimitive() && context.getCurrentObject() != null
                        && Number.class.isInstance(context.getCurrentObject())){
            ret = "((" + ExpressionCompiler.getCastString(context.getCurrentObject().getClass()) + ")" + ret + ")";
            ret += "." + OgnlRuntime.getNumericValueGetter(context.getCurrentObject().getClass());
        }else if (context.getCurrentType() != null && context.getCurrentType().isPrimitive()
                        && (ASTConst.class.isInstance(child) || NumericExpression.class.isInstance(child))){
            ret += OgnlRuntime.getNumericLiteral(context.getCurrentType());
        }else if (context.getCurrentType() != null && String.class.isAssignableFrom(context.getCurrentType())){
            ret = "Double.parseDouble(" + ret + ")";
            context.setCurrentType(Double.TYPE);
        }

        if (NumericExpression.class.isInstance(child)){
            ret = "(" + ret + ")";
        }

        return ret;
    }
}