Returns the property name for a method. - Java Reflection

Java examples for Reflection:Method Name

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Description

Returns the property name for a method.

Demo Code

/*/*from ww w. ja  va 2  s  .  c o m*/
 * Copyright 2002-2006,2009 The Apache Software Foundation.
 * 
 * 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.lang.reflect.Method;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    private static final Pattern SETTER_PATTERN = Pattern
            .compile("set([A-Z][A-Za-z0-9]*)$");
    private static final Pattern GETTER_PATTERN = Pattern
            .compile("(get|is|has)([A-Z][A-Za-z0-9]*)$");

    /**
     * Returns the property name for a method.
     * This method is independant from property fields.
     *
     * @param method The method to get the property name for.
     * @return the property name for given method; null if non could be resolved.
     */
    public static String resolvePropertyName(Method method) {

        Matcher matcher = SETTER_PATTERN.matcher(method.getName());
        if (matcher.matches() && method.getParameterTypes().length == 1) {
            String raw = matcher.group(1);
            return raw.substring(0, 1).toLowerCase() + raw.substring(1);
        }

        matcher = GETTER_PATTERN.matcher(method.getName());
        if (matcher.matches() && method.getParameterTypes().length == 0) {
            String raw = matcher.group(2);
            return raw.substring(0, 1).toLowerCase() + raw.substring(1);
        }

        return null;
    }
}

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