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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;

import java.lang.reflect.Method;

/**
 * Call is a POJO to encapsulate the information required to make a single java
 * call, including the result of the call (either returned data or exception).
 * Either the Method and Parameters should be filled in to allow a call to be
 * made or, the exception should be filled in indicating that things have gone
 * wrong already.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class Call
{
    /**
     * @return the exception
     */
    public Throwable getException()
    {
        return exception;
    }

    /**
     * @param exception the exception to set
     */
    public void setException(Throwable exception)
    {
        this.exception = exception;
    }

    /**
     * @return the method
     */
    public Method getMethod()
    {
        return method;
    }

    /**
     * @param method the method to set
     */
    public void setMethod(Method method)
    {
        this.method = method;
    }

    /**
     * @return the parameters
     */
    public Object[] getParameters()
    {
        return parameters;
    }

    /**
     * @param parameters the parameters to set
     */
    public void setParameters(Object[] parameters)
    {
        this.parameters = parameters;
    }

    /**
     * @param callId The callId to set.
     */
    public void setCallId(String callId)
    {
        this.callId = callId;
    }

    /**
     * @return Returns the callId.
     */
    public String getCallId()
    {
        return callId;
    }

    /**
     * @param scriptName The scriptName to set.
     */
    public void setScriptName(String scriptName)
    {
        this.scriptName = scriptName;
    }

    /**
     * @return Returns the scriptName.
     */
    public String getScriptName()
    {
        return scriptName;
    }

    /**
     * @param methodName The methodName to set.
     */
    public void setMethodName(String methodName)
    {
        this.methodName = methodName;
    }

    /**
     * @return Returns the methodName.
     */
    public String getMethodName()
    {
        return methodName;
    }

    private String callId = null;

    private String scriptName = null;

    private String methodName = null;

    private Method method = null;

    private Object[] parameters = null;

    private Throwable exception = null;
}