net.sf.morph.reflect.support.MethodHolder.java Source code

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Here is the source code for net.sf.morph.reflect.support.MethodHolder.java

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/*
 * Copyright 2004-2005, 2010 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 net.sf.morph.reflect.support;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Holds a reference to the getter and setter methods of a JavaBeans property.
 *  
 * @author Matt Sgarlata
 * @author Alexander Volanis
 * @since Feb 3, 2005
 */
public class MethodHolder {

    private static final Log log = LogFactory.getLog(MethodHolder.class);

    private Method mutator;
    private Method indexedMutator;
    private Method accessor;
    private Method indexedAccessor;

    /**
     * Get the mutator of this MethodHolder.
     * @return the mutator
     */
    public Method getMutator() {
        return mutator;
    }

    /**
     * Set the mutator of this MethodHolder.
     * @param mutator the Method to set
     */
    public void setMutator(Method mutator) {
        this.mutator = mutator;
    }

    /**
     * Get the indexedMutator of this MethodHolder.
     * @return the indexedMutator
     */
    public Method getIndexedMutator() {
        return indexedMutator;
    }

    /**
     * Set the indexedMutator of this MethodHolder.
     * @param indexedMutator the Method to set
     */
    public void setIndexedMutator(Method indexedMutator) {
        this.indexedMutator = indexedMutator;
    }

    /**
     * Get the accessor of this MethodHolder.
     * @return the accessor
     */
    public Method getAccessor() {
        return accessor;
    }

    /**
     * Set the accessor of this MethodHolder.
     * @param accessor the Method to set
     */
    public void setAccessor(Method accessor) {
        this.accessor = accessor;
    }

    /**
     * Get the indexedAccessor of this MethodHolder.
     * @return the indexedAccessor
     */
    public Method getIndexedAccessor() {
        return indexedAccessor;
    }

    /**
     * Set the indexedAccessor of this MethodHolder.
     * @param indexedAccessor the Method to set
     */
    public void setIndexedAccessor(Method indexedAccessor) {
        this.indexedAccessor = indexedAccessor;
    }

    /**
     * Generate a String description of a Method.
     * @param method
     * @return String
     */
    protected static String methodToString(Method method) {
        StringBuffer buffer = new StringBuffer();
        buffer.append("<");
        buffer.append(method.getReturnType() == null ? "void" : method.getReturnType().getName());
        buffer.append("> ");
        buffer.append(method.getName());
        buffer.append("(");
        Class[] parameterTypes = method.getParameterTypes();
        if (parameterTypes != null) {
            for (int i = 0; i < parameterTypes.length; i++) {
                buffer.append(parameterTypes[i].getName());
                if (i != parameterTypes.length - 1) {
                    buffer.append(",");
                }
            }
        }
        buffer.append(")");
        return buffer.toString();
    }

    /**
     * Invoke the mutator.
     * @param bean
     * @param value
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public void invokeMutator(Object bean, Object value)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        if (log.isTraceEnabled()) {
            log.trace("Invoking mutator " + methodToString(mutator) + " on bean of class "
                    + bean.getClass().getName());
        }
        mutator.invoke(bean, new Object[] { value });
    }

    /**
     * Invoke the accessor.
     * @param bean
     * @return value
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public Object invokeAccessor(Object bean)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        if (log.isTraceEnabled()) {
            log.trace("Invoking accessor " + methodToString(accessor) + " on bean of class "
                    + bean.getClass().getName());
        }
        return accessor.invoke(bean, (Object[]) null);
    }

    /**
     * Invoke the indexed mutator.
     * @param bean
     * @param index
     * @param value
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public void invokeIndexedMutator(Object bean, Object index, Object value)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        if (log.isTraceEnabled()) {
            log.trace("Invoking mutator " + methodToString(indexedMutator) + " on bean of class "
                    + bean.getClass().getName());
        }
        indexedMutator.invoke(bean, new Object[] { index, value });
    }

    /**
     * Invoke the indexed accessor.
     * @param bean
     * @param index
     * @return value
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public Object invokeIndexedAccessor(Object bean, Object index)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        if (log.isTraceEnabled()) {
            log.trace("Invoking accessor " + methodToString(indexedAccessor) + " on bean of class "
                    + bean.getClass().getName());
        }
        return indexedAccessor.invoke(bean, new Object[] { index });
    }
}