org.directwebremoting.json.parse.impl.ReflectionJsonDecoder Maven / Gradle / Ivy

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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker
 *
 * 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 org.directwebremoting.json.parse.impl;

import java.lang.reflect.InvocationTargetException;
import java.util.Collection;

import org.directwebremoting.json.parse.JsonDecoder;
import org.directwebremoting.json.parse.JsonParseException;
import org.directwebremoting.util.LocalUtil;

/**
 * A {@link JsonDecoder} that de-serializes the data into an existing set of
 * objects.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ReflectionJsonDecoder extends StatefulJsonDecoder
{
    private final Class marshallInto;

    /**
     * @param marshallInto
     */
    public ReflectionJsonDecoder(Class marshallInto)
    {
        this.marshallInto = marshallInto;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.impl.StatefulJsonDecoder#createObject(Object, String)
     */
    @Override
    protected Object createObject(Object parent, String propertyName) throws JsonParseException
    {
        return createArray(parent, propertyName);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.impl.StatefulJsonDecoder#createArray(java.lang.Object, java.lang.String)
     */
    @Override
    protected Object createArray(Object parent, String propertyName) throws JsonParseException
    {
        if (parent == null)
        {
            return createType(marshallInto);
        }
        else
        {
            Class type = LocalUtil.getPropertyType(parent.getClass(), propertyName);
            return createType(type);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.impl.StatefulJsonDecoder#addMember(java.lang.Object, java.lang.String, java.lang.Object)
     */
    @Override
    protected void addMemberToObject(Object parent, String propertyName, Object member) throws JsonParseException
    {
        try
        {
            LocalUtil.setProperty(parent, propertyName, member);
        }
        catch (SecurityException ex)
        {
            throw new JsonParseException(ex);
        }
        catch (IllegalArgumentException ex)
        {
            throw new JsonParseException(ex);
        }
        catch (NoSuchMethodException ex)
        {
            throw new JsonParseException(ex);
        }
        catch (IllegalAccessException ex)
        {
            throw new JsonParseException(ex);
        }
        catch (InvocationTargetException ex)
        {
            throw new JsonParseException(ex);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.impl.StatefulJsonDecoder#addMember(java.lang.Object, java.lang.Object)
     */
    @Override
    protected void addMemberToArray(Object parent, Object member)
    {
        @SuppressWarnings("unchecked")
        Collection