methodcallermultiadapter.java

来自「Groovy动态语言 运行在JVM中的动态语言 可以方便的处理业务逻辑变化大的业」· Java 代码 · 共 72 行

/*
 * InvokeMethodAdapter.java created on 14.09.2006
 *
 * To change this generated comment go to 
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
package org.codehaus.groovy.classgen;

import org.objectweb.asm.MethodVisitor;

public class MethodCallerMultiAdapter {
    private MethodCaller[] methods;
    boolean skipSpreadSafeAndSafe;
    
    public final static int maxArgs = 0;
    
    public static MethodCallerMultiAdapter newStatic(Class theClass, String baseName, boolean createNArgs, boolean skipSpreadSafeAndSafe) {
        MethodCallerMultiAdapter mcma = new MethodCallerMultiAdapter();
        mcma.skipSpreadSafeAndSafe = skipSpreadSafeAndSafe;
        if (createNArgs) {
            int numberOfBaseMethods = mcma.numberOfBaseMethods();
            mcma.methods = new MethodCaller[(maxArgs+2)*numberOfBaseMethods];
            for (int i=0; i<=maxArgs; i++) {
                mcma.methods[i*numberOfBaseMethods] = MethodCaller.newStatic(theClass,baseName+i);
                if (skipSpreadSafeAndSafe) continue;
                mcma.methods[i*numberOfBaseMethods+1] = MethodCaller.newStatic(theClass,baseName+i+"Safe");
                mcma.methods[i*numberOfBaseMethods+2] = MethodCaller.newStatic(theClass,baseName+i+"SpreadSafe");
            }
            mcma.methods[(maxArgs+1)*numberOfBaseMethods] = MethodCaller.newStatic(theClass,baseName+"N");
            if (!skipSpreadSafeAndSafe) {
                mcma.methods[(maxArgs+1)*numberOfBaseMethods+1] = MethodCaller.newStatic(theClass,baseName+"N"+"Safe");
                mcma.methods[(maxArgs+1)*numberOfBaseMethods+2] = MethodCaller.newStatic(theClass,baseName+"N"+"SpreadSafe");
            }
            
        } else if (!skipSpreadSafeAndSafe) {
            mcma.methods = new MethodCaller[]{
                    MethodCaller.newStatic(theClass,baseName),
                    MethodCaller.newStatic(theClass,baseName+"Safe"),
                    MethodCaller.newStatic(theClass,baseName+"SpreadSafe")
            };
        } else {
            mcma.methods = new MethodCaller[]{
                    MethodCaller.newStatic(theClass,baseName)
            };
        }
        return mcma;
    }
    
    /**
     * 
     * @param methodVisitor
     * @param numberOfArguments a value >0 describing how many arguments are additionally used for the method call
     * @param safe
     * @param spreadSafe
     */
    public void call(MethodVisitor methodVisitor, int numberOfArguments, boolean safe, boolean spreadSafe) {
        int offset = 0;
        if (safe && !skipSpreadSafeAndSafe) offset = 1;
        if (spreadSafe && !skipSpreadSafeAndSafe) offset = 2;
        if (numberOfArguments>maxArgs || numberOfArguments<0){
            offset += (maxArgs+1)*numberOfBaseMethods();
        } else {
            offset += numberOfArguments*numberOfBaseMethods();
        }
        methods[offset].call(methodVisitor);
    }
    
    private int numberOfBaseMethods(){
        if (skipSpreadSafeAndSafe) return 1;
        return 3;
    }
}