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Groovy example source code file (MethodCallerMultiAdapter.java)

This example Groovy source code file (MethodCallerMultiAdapter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

max_args, max_args, methodcaller, methodcaller, methodcallermultiadapter, methodcallermultiadapter, n, safe, safe, spreadsafe, string

The Groovy MethodCallerMultiAdapter.java source code

/*
 * Copyright 2003-2007 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 org.codehaus.groovy.classgen.asm;

import org.objectweb.asm.MethodVisitor;

public class MethodCallerMultiAdapter {
    private MethodCaller[] methods;
    boolean skipSpreadSafeAndSafe;

    public static final int MAX_ARGS = 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[(MAX_ARGS + 2) * numberOfBaseMethods];
            for (int i = 0; i <= MAX_ARGS; 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[(MAX_ARGS + 1) * numberOfBaseMethods] = MethodCaller.newStatic(theClass, baseName + "N");
            if (!skipSpreadSafeAndSafe) {
                mcma.methods[(MAX_ARGS + 1) * numberOfBaseMethods + 1] = MethodCaller.newStatic(theClass, baseName + "N" + "Safe");
                mcma.methods[(MAX_ARGS + 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 > MAX_ARGS || numberOfArguments < 0) {
            offset += (MAX_ARGS + 1) * numberOfBaseMethods();
        } else {
            offset += numberOfArguments * numberOfBaseMethods();
        }
        methods[offset].call(methodVisitor);
    }

    private int numberOfBaseMethods() {
        if (skipSpreadSafeAndSafe) return 1;
        return 3;
    }
}

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