Copies property values from the source to the destination for all cases where the property names are the same. - Java Reflection

Description

Copies property values from the source to the destination for all cases where the property names are the same.

Demo Code

/*/* w ww .  j  av a  2  s  .  c  o m*/
 * Copyright 2004-2010 the Seasar Foundation and the Others.
 *
 * 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.
 */
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.servlet.http.HttpServletRequest;

public class Main{
    public static void main(String[] argv) throws Exception{
        Object src = "java2s.com";
        Object dest = "java2s.com";
        copy(src,dest);
    }
    private static final CopyOptions DEFAULT_OPTIONS = new CopyOptions();
    private static ConcurrentHashMap<String, BeanDesc> beanDescCache = new ConcurrentHashMap<String, BeanDesc>(
            200);
    private static volatile boolean initialized = false;
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     */
    public static void copy(Object src, Object dest) {
        copy(src, dest, DEFAULT_OPTIONS);
    }
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     * @param options
     *            the copy options
     * @throws NullPointerException
     *             if the src parameter is null or if the dest parameter is null
     *             or if the options parameter is null
     */
    public static void copy(Object src, Object dest, CopyOptions options)
            throws NullPointerException {
        if (src == null) {
            throw new NullPointerException("The src parameter is null.");
        }
        if (dest == null) {
            throw new NullPointerException("The dest parameter is null.");
        }
        if (options == null) {
            throw new NullPointerException("The options parameter is null.");
        }
        BeanDesc srcBeanDesc = getBeanDesc(src.getClass());
        BeanDesc destBeanDesc = getBeanDesc(dest.getClass());
        int size = srcBeanDesc.getPropertyDescSize();
        for (int i = 0; i < size; i++) {
            PropertyDesc srcPropertyDesc = srcBeanDesc.getPropertyDesc(i);
            String propertyName = srcPropertyDesc.getName();
            if (!srcPropertyDesc.isReadable()
                    || !options.isTargetProperty(propertyName)) {
                continue;
            }
            PropertyDesc destPropertyDesc = destBeanDesc
                    .getPropertyDesc(propertyName);
            if (destPropertyDesc == null) {
                continue;
            }
            if (!destPropertyDesc.isWritable()) {
                continue;
            }
            Object value = srcPropertyDesc.getValue(src);
            if (!options.isTargetValue(value)) {
                continue;
            }
            value = options.convertValue(value, propertyName,
                    destPropertyDesc.getPropertyClass());
            destPropertyDesc.setValue(dest, value);
        }
    }
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     */
    @SuppressWarnings("unchecked")
    public static void copy(Object src, Map dest) {
        copy(src, dest, DEFAULT_OPTIONS);
    }
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     * @param options
     *            the copy options
     * @throws NullPointerException
     *             if the src parameter is null or if the dest parameter is null
     *             or if the options parameter is null
     */
    @SuppressWarnings("unchecked")
    public static void copy(Object src, Map dest, CopyOptions options)
            throws NullPointerException {
        if (src == null) {
            throw new NullPointerException("The src parameter is null.");
        }
        if (dest == null) {
            throw new NullPointerException("The dest parameter is null.");
        }
        if (options == null) {
            throw new NullPointerException("The options parameter is null.");
        }
        BeanDesc srcBeanDesc = getBeanDesc(src.getClass());
        int size = srcBeanDesc.getPropertyDescSize();
        for (int i = 0; i < size; i++) {
            PropertyDesc srcPropertyDesc = srcBeanDesc.getPropertyDesc(i);
            String propertyName = srcPropertyDesc.getName();
            if (!srcPropertyDesc.isReadable()
                    || !options.isTargetProperty(propertyName)) {
                continue;
            }
            Object value = srcPropertyDesc.getValue(src);
            if (!options.isTargetValue(value)) {
                continue;
            }
            value = options.convertValue(value, propertyName, null);
            dest.put(propertyName, value);
        }
    }
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     */
    @SuppressWarnings("unchecked")
    public static void copy(Map src, Object dest) {
        copy(src, dest, DEFAULT_OPTIONS);
    }
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     * @param options
     *            the copy options
     * @throws NullPointerException
     *             if the src parameter is null or if the dest parameter is null
     *             or if the options parameter is null
     */
    @SuppressWarnings("unchecked")
    public static void copy(Map src, Object dest, CopyOptions options)
            throws NullPointerException {
        if (src == null) {
            throw new NullPointerException("The src parameter is null.");
        }
        if (dest == null) {
            throw new NullPointerException("The dest parameter is null.");
        }
        if (options == null) {
            throw new NullPointerException("The options parameter is null.");
        }
        BeanDesc destBeanDesc = getBeanDesc(dest.getClass());
        for (Iterator<String> i = src.keySet().iterator(); i.hasNext();) {
            String propertyName = i.next();
            if (!options.isTargetProperty(propertyName)) {
                continue;
            }
            PropertyDesc destPropertyDesc = destBeanDesc
                    .getPropertyDesc(propertyName);
            if (destPropertyDesc == null) {
                continue;
            }
            if (!destPropertyDesc.isWritable()) {
                continue;
            }
            Object value = src.get(propertyName);
            if (!options.isTargetValue(value)) {
                continue;
            }
            value = options.convertValue(value, propertyName,
                    destPropertyDesc.getPropertyClass());
            destPropertyDesc.setValue(dest, value);
        }
    }
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     */
    @SuppressWarnings("unchecked")
    public static void copy(Map src, Map dest) {
        copy(src, dest, DEFAULT_OPTIONS);
    }
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     * @param options
     *            the copy options
     * @throws NullPointerException
     *             if the src parameter is null or if the dest parameter is null
     *             or if the options parameter is null
     */
    @SuppressWarnings("unchecked")
    public static void copy(Map src, Map dest, CopyOptions options)
            throws NullPointerException {
        if (src == null) {
            throw new NullPointerException("The src parameter is null.");
        }
        if (dest == null) {
            throw new NullPointerException("The dest parameter is null.");
        }
        if (options == null) {
            throw new NullPointerException("The options parameter is null.");
        }
        for (Iterator<String> i = src.keySet().iterator(); i.hasNext();) {
            String propertyName = i.next();
            if (!options.isTargetProperty(propertyName)) {
                continue;
            }
            Object value = src.get(propertyName);
            if (!options.isTargetValue(value)) {
                continue;
            }
            value = options.convertValue(value, propertyName, null);
            dest.put(propertyName, value);
        }
    }
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     */
    public static void copy(HttpServletRequest src, Object dest) {
        copy(src, dest, DEFAULT_OPTIONS);
    }
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     * @param options
     *            the copy options
     * @throws NullPointerException
     *             if the src parameter is null
     */
    public static void copy(HttpServletRequest src, Object dest,
            CopyOptions options) throws NullPointerException {
        if (src == null) {
            throw new NullPointerException("The src parameter is null.");
        }
        copy(new RequestMap(src), dest, options);
    }
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     */
    public static void copy(Object src, HttpServletRequest dest) {
        copy(src, dest, DEFAULT_OPTIONS);
    }
    /**
     * Copies property values from the source to the destination for all cases
     * where the property names are the same. Even if the property type of the
     * source is different from the one of the destination, the value is
     * converted appropriately.
     * 
     * @param src
     *            the source
     * @param dest
     *            the destination
     * @param options
     *            the copy options
     * @throws NullPointerException
     *             if the dest parameter is null
     * 
     */
    public static void copy(Object src, HttpServletRequest dest,
            CopyOptions options) throws NullPointerException {
        if (dest == null) {
            throw new NullPointerException("The dest parameter is null.");
        }
        copy(src, new RequestMap(dest), options);
    }
    /**
     * Returns the bean descriptor.
     * 
     * @param beanClass
     *            the bean class
     * @return the bean descriptor
     * @throws NullPointerException
     *             if the beanClass parameter is null
     * 
     */
    public static BeanDesc getBeanDesc(Class<?> beanClass)
            throws NullPointerException {
        if (beanClass == null) {
            throw new NullPointerException(
                    "The beanClass parameter is null.");
        }
        if (!initialized) {
            initialize();
        }

        BeanDesc beanDesc = beanDescCache.get(beanClass.getName());
        if (beanDesc != null) {
            return beanDesc;
        }
        beanDesc = BeanDesc.create(beanClass);
        beanDescCache.put(beanClass.getName(), beanDesc);
        return beanDesc;
    }
    private static void initialize() {
        Cleaner.add(new Cleanable() {
            public void clean() {
                beanDescCache.clear();
                initialized = false;
            }
        });
        initialized = true;
    }
}

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