org.directwebremoting.dwrp.CallBatch 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 boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.
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package org.directwebremoting.dwrp;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import jakarta.servlet.http.HttpServletRequest;

import org.directwebremoting.extend.Call;
import org.directwebremoting.extend.Calls;
import org.directwebremoting.extend.ConvertUtil;
import org.directwebremoting.extend.FormField;
import org.directwebremoting.extend.InboundContext;
import org.directwebremoting.extend.ProtocolConstants;
import org.directwebremoting.extend.ServerException;
import org.directwebremoting.util.LocalUtil;

/**
 * A container for all the by-products of an HttpRequest parse
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class CallBatch extends Batch
{
    /**
     * Parse an inbound request into a Calls object
     * @param request The original browser's request
     * @throws ServerException ...
     */
    public CallBatch(HttpServletRequest request) throws ServerException
    {
        super(request);
        parseParameters();
    }

    /**
     * Fish out the important parameters
     * @throws SecurityException If the parsing of input parameter fails
     */
    private void parseParameters()
    {
        // Work out how many calls are in this packet
        String callStr = extractParameter(ProtocolConstants.INBOUND_CALL_COUNT, THROW);
        int callCount;
        try
        {
            callCount = Integer.parseInt(callStr);
        }
        catch (NumberFormatException ex)
        {
            throw new SecurityException("Invalid Call Count");
        }

        if (callCount > maxCallsPerBatch)
        {
            throw new SecurityException("Too many calls in a batch");
        }

        calls.setBatchId(getBatchId());
        calls.setInstanceId(getInstanceId());

        // Extract the ids, script names and method names
        for (int callNum = 0; callNum < callCount; callNum++)
        {
            InboundContext inboundContext = new InboundContext();
            inboundContexts.add(inboundContext);

            String prefix = ProtocolConstants.INBOUND_CALLNUM_PREFIX + callNum + ProtocolConstants.INBOUND_CALLNUM_SUFFIX;

            // The special values
            String callId = extractParameter(prefix + ProtocolConstants.INBOUND_KEY_ID, THROW);
            if (!LocalUtil.isLetterOrDigitOrUnderline(callId))
            {
                throw new SecurityException("Call IDs may only contain Java Identifiers");
            }

            String scriptName = extractParameter(prefix + ProtocolConstants.INBOUND_KEY_SCRIPTNAME, THROW);
            if (!LocalUtil.isValidScriptName(scriptName))
            {
                throw new SecurityException("Illegal script name.");
            }

            String methodName = extractParameter(prefix + ProtocolConstants.INBOUND_KEY_METHODNAME, THROW);
            if (!LocalUtil.isLetterOrDigitOrUnderline(methodName))
            {
                throw new SecurityException("Method names may only contain Java Identifiers");
            }

            // Look for parameters to this method
            for (Iterator> it = getExtraParameters().entrySet().iterator(); it.hasNext();)
            {
                Map.Entry entry = it.next();
                String key = entry.getKey();

                if (key.startsWith(prefix))
                {
                    FormField formField = entry.getValue();
                    if (formField.isFile())
                    {
                        inboundContext.createInboundVariable(callNum, key, ProtocolConstants.TYPE_FILE, formField);
                    }
                    else
                    {
                        String[] split = ConvertUtil.splitInbound(formField.getString());

                        String value = split[ConvertUtil.INBOUND_INDEX_VALUE];
                        String type = split[ConvertUtil.INBOUND_INDEX_TYPE].replace('?', ':');
                        inboundContext.createInboundVariable(callNum, key, type, value);
                    }
                    it.remove();
                }
            }

            Call call = new Call(callId, scriptName, methodName);
            calls.addCall(call);
        }
    }

    /**
     * @return the inboundContexts
     */
    public List getInboundContexts()
    {
        return inboundContexts;
    }

    /**
     * There is one inbound context to keep track of the conversions that are
     * done for each call.
     */
    private final List inboundContexts = new ArrayList();

    /**
     * @return the calls
     */
    public Calls getCalls()
    {
        return calls;
    }

    /**
     * The list of calls in the batch
     */
    private final Calls calls = new Calls();

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString()
    {
        return "CallBatch[page=" + getPage() + ",scriptSessionId=" + getScriptSessionId() + "]";
    }

    /**
     * We don't want to allow too many calls in a batch
     */
    private static final int maxCallsPerBatch = 1000;
}