org.directwebremoting.create.AbstractCreator 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.create;

import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.extend.Creator;
import org.directwebremoting.util.LocalUtil;
import org.directwebremoting.util.Messages;

/**
 * A simple implementation of the basic parts of Creator
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public abstract class AbstractCreator implements Creator
{
    /* (non-Javadoc)
     * @see org.directwebremoting.Creator#setProperties(java.util.Map)
     */
    public void setProperties(Map params) throws IllegalArgumentException
    {
        // The default is to use getters and setters
    }

    /**
     * @return Returns the javascript name.
     */
    public String getJavascript()
    {
        return javascript;
    }

    /**
     * @param javascript The javascript name to set.
     */
    public void setJavascript(String javascript)
    {
        if (!LocalUtil.isJavaIdentifier(javascript))
        {
            log.error("Illegal identifier: '" + javascript + "'");
            throw new IllegalArgumentException("Illegal identifier");
        }

        this.javascript = javascript;
    }

    /**
     * @param scope Set the scope.
     */
    public void setScope(String scope)
    {
        checkScope(scope);
        this.scope = scope;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.Creator#getScope()
     */
    public String getScope()
    {
        return scope;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.Creator#isCacheable()
     */
    public boolean isCacheable()
    {
        return cacheable;
    }

    /**
     * @param cacheable Whether or not to cache the script.
     */
    public void setCacheable(boolean cacheable)
    {
        this.cacheable = cacheable;
    }

    /**
     * Is the given scope valid?
     * @param cscope The scope string to match
     */
    protected static void checkScope(String cscope)
    {
        if (!cscope.equals(SCRIPT) && !cscope.equals(PAGE) && !cscope.equals(REQUEST) && !cscope.equals(SESSION) && !cscope.equals(APPLICATION))
        {
            throw new IllegalArgumentException(Messages.getString("AbstractCreator.IllegalScope", cscope));
        }
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString()
    {
        return getClass().getSimpleName() + "[" + getJavascript() + "]";
    }

    /**
     * Do the methods on the Creator change over time?
     */
    private boolean cacheable = false;

    /**
     * The javascript name for the class
     */
    private String javascript = null;

    /**
     * The scope of the objects created by this creator
     */
    private String scope = PAGE;

    /**
     * The log stream
     */
    private static final Log log = LogFactory.getLog(AbstractCreator.class);
}