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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.extend;

/**
 * A simple data container for 2 strings that comprise information about how a
 * Java object has been converted into Javascript.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface OutboundVariable
{
    /**
     * @return Returns the buildCode.
     */
    String getBuildCode();

    /**
     * @return Returns the declareCode
     */
    String getDeclareCode();

    /**
     * @return Returns the assignCode.
     */
    String getAssignCode();

    /**
     * Get a reference to this OutboundVariable.
     * If this already is a reference then this method returns
     * this, or if not it creates one that does.
     * @return An OutboundVariable that refers to this one.
     */
    OutboundVariable getReferenceVariable();
}