Return the mutator method for attribute with specified name and type. - Java Reflection

Java examples for Reflection:Method Name

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Description

Return the mutator method for attribute with specified name and type.

Demo Code


//package com.java2s;
import java.lang.reflect.Method;

import javax.management.openmbean.OpenDataException;

public class Main {
    public static void main(String[] argv) throws Exception {
        Class type = String.class;
        String name = "java2s.com";
        Class attributeType = String.class;
        boolean mustBePublic = true;
        System.out.println(getMutator(type, name, attributeType,
                mustBePublic));/* w w w. j a v  a 2  s .  co  m*/
    }

    /** Prefix for all mutator methods. */
    private static final String MUTATOR_PREFIX = "set";

    /**
     * Return the mutator method for attribute with specified name and type.
     *
     * @param type the type to retrieve method from.
     * @param name the name of the attribute.
     * @param attributeType the attribute attributeType.
     * @return the mutator method if any.
     * @throws OpenDataException if unable to find mutator method.
     */
    public static Method getMutator(final Class type, final String name,
            final Class attributeType, final boolean mustBePublic)
            throws OpenDataException {
        try {
            final String accessorName = MUTATOR_PREFIX
                    + Character.toUpperCase(name.charAt(0))
                    + name.substring(1);
            final Class[] params = new Class[] { attributeType };
            final Method mutator;
            if (mustBePublic) {
                mutator = type.getMethod(accessorName, params);
            } else {
                mutator = type.getDeclaredMethod(accessorName, params);
            }
            if (Void.TYPE != mutator.getGenericReturnType()) {
                final String message = "Mutator for " + name
                        + " should not return any value.";
                throw new OpenDataException(message);
            }
            return mutator;
        } catch (final NoSuchMethodException nsme) {
            final String message = "Missing mutator for field " + name;
            throw new OpenDataException(message);
        }
    }
}

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