bind Method Parameters via reflection - Java Reflection

Java examples for Reflection:Method Parameter

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Description

bind Method Parameters via reflection

Demo Code

/**//from  ww  w .  j  a  v a 2 s . com
 * Copyright 2007 Google Inc.
 *
 * 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 com.java2s;
import java.io.File;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

public class Main {
    private static Object[] bindParameters(Method method, String[] args) {
        List<Object> parameters = new ArrayList<Object>();
        Class[] parameterTypes = method.getParameterTypes();
        for (int i = 0, len = parameterTypes.length; i < len; i++) {
            Class type = parameterTypes[i];
            int remaining = Math.max(0, args.length - i);
            if (type.equals(String[].class)) {
                String[] rest = new String[remaining];
                System.arraycopy(args, 1, rest, 0, remaining);
                parameters.add(rest);
            } else if (remaining > 0) {
                parameters
                        .add(convertParameter(args[i], parameterTypes[i]));
            } else {
                parameters.add(null);
            }
        }
        return parameters.toArray();
    }

    private static Object convertParameter(String arg, Class type) {
        if (type.equals(String.class)) {
            return arg;
        } else if (type.equals(Integer.class)) {
            return Integer.valueOf(arg, 10);
        } else if (type.equals(File.class)) {
            return new File(arg);
        } else {
            throw new UnsupportedOperationException("Unknown type " + type);
        }
    }
}

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