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/**
 *  Copyright (c) 1997-2013, www.tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 *
 *  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.tinygroup.jspengine.el.parser;

import org.tinygroup.jspengine.el.lang.EvaluationContext;
import org.tinygroup.jspengine.el.util.MessageFactory;

import javax.el.ELException;
import javax.el.FunctionMapper;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;


/**
 * @author Jacob Hookom [[email protected]]
 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: tcfujii $
 */
public final class AstFunction extends SimpleNode {

    protected String localName = "";

    protected String prefix = "";

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

    public String getLocalName() {
        return localName;
    }

    public String getOutputName() {
        if (this.prefix == null) {
            return this.localName;
        } else {
            return this.prefix + ":" + this.localName;
        }
    }

    public String getPrefix() {
        return prefix;
    }

    public Class getType(EvaluationContext ctx)
            throws ELException {
        
        FunctionMapper fnMapper = ctx.getFunctionMapper();
        
        // quickly validate again for this request
        if (fnMapper == null) {
            throw new ELException(MessageFactory.get("error.fnMapper.null"));
        }
        Method m = fnMapper.resolveFunction(this.prefix, this.localName);
        if (m == null) {
            throw new ELException(MessageFactory.get("error.fnMapper.method",
                    this.getOutputName()));
        }
        return m.getReturnType();
    }

    public Object getValue(EvaluationContext ctx)
            throws ELException {
        
        FunctionMapper fnMapper = ctx.getFunctionMapper();
        
        // quickly validate again for this request
        if (fnMapper == null) {
            throw new ELException(MessageFactory.get("error.fnMapper.null"));
        }
        Method m = fnMapper.resolveFunction(this.prefix, this.localName);
        if (m == null) {
            throw new ELException(MessageFactory.get("error.fnMapper.method",
                    this.getOutputName()));
        }

        Class[] paramTypes = m.getParameterTypes();
        Object[] params = null;
        Object result = null;
        int numParams = this.jjtGetNumChildren();
        if (numParams > 0) {
            params = new Object[numParams];
            try {
                for (int i = 0; i < numParams; i++) {
                    params[i] = this.children[i].getValue(ctx);
                    params[i] = coerceToType(params[i], paramTypes[i]);
                }
            } catch (ELException ele) {
                throw new ELException(MessageFactory.get("error.function", this
                        .getOutputName()), ele);
            }
        }
        try {
            result = m.invoke(null, params);
        } catch (IllegalAccessException iae) {
            throw new ELException(MessageFactory.get("error.function", this
                    .getOutputName()), iae);
        } catch (InvocationTargetException ite) {
            throw new ELException(MessageFactory.get("error.function", this
                    .getOutputName()), ite.getCause());
        }
        return result;
    }

    public void setLocalName(String localName) {
        this.localName = localName;
    }

    public void setPrefix(String prefix) {
        this.prefix = prefix;
    }
    
    
    public String toString()
    {
        return ELParserTreeConstants.jjtNodeName[id] + "[" + this.getOutputName() + "]";
    }
}