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the hasor DataQL project.

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/*
 * Copyright 2008-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * 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 net.hasor.dataql.runtime.inset;
import net.hasor.dataql.ProcessException;
import net.hasor.dataql.runtime.InsetProcess;
import net.hasor.dataql.runtime.InstSequence;
import net.hasor.dataql.runtime.ProcessContet;
import net.hasor.dataql.runtime.mem.MemStack;
import net.hasor.dataql.runtime.mem.StackStruts;
import net.hasor.dataql.runtime.struts.LambdaCall;
/**
 * METHOD，位于定义 lambda 函数的执行序列头部。该指令的目的是对发起调用的入参参数个数进行规整化。
 * 例： *  var foo = lambda : (a,b,c) -> {
 *       return a+b+c;
 *   }
 *   return foo(1,2,3,4,5)~;
 *  * 例子中，foo 方法定义了 3个参数，但是当发起调用 foo 时实际传入了 5 个参数。METHOD，指令的目的就是为了纠正入参个数的不一致。
 *
 * @author 赵永春([email protected])
 * @version : 2017-07-19
 */
class METHOD implements InsetProcess {
    @Override
    public int getOpcode() {
        return METHOD;
    }
    @Override
    public void doWork(InstSequence sequence, MemStack memStack, StackStruts local, ProcessContet context) throws ProcessException {
        int paramCount = sequence.currentInst().getInt(0);
        LambdaCall result = (LambdaCall) memStack.peek();
        //
        if (result.getArrays() == null || paramCount != result.getArrays().length) {
            Object[] finalParamArray = new Object[paramCount];
            Object[] inParams = result.getArrays();
            for (int i = 0; i < paramCount; i++) {
                if (i > (inParams.length - 1)) {
                    break;
                }
                finalParamArray[i] = inParams[i];
            }
            result.updateArrays(finalParamArray);
        }
        //
    }
}