org.directwebremoting.json.parse.impl.DebuggingJsonDecoder 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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.json.parse.JsonDecoder;
import org.directwebremoting.json.parse.JsonParseException;

/**
 * A proxy implementation of {@link JsonDecoder} which simply passes the calls
 * on to another JsonDecoder, but outputs debug logging what happened while the
 * parse was happening.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class DebuggingJsonDecoder implements JsonDecoder
{
    public DebuggingJsonDecoder(JsonDecoder proxy)
    {
        this.proxy = proxy;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#getRoot()
     */
    public Object getRoot() throws JsonParseException
    {
        return proxy.getRoot();
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#beginObject(java.lang.String)
     */
    public void beginObject(String propertyName) throws JsonParseException
    {
        if (indent.length() == 0)
        {
            log.info("--------");
        }
        log.info(indent + "{");
        increaseIndent();

        proxy.beginObject(propertyName);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#endObject(java.lang.String)
     */
    public void endObject(String propertyName) throws JsonParseException
    {
        proxy.endObject(propertyName);

        decreaseIndent();
        log.info(indent + "}");

        if (indent.length() == 0)
        {
            log.info("--------");
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#beginArray(java.lang.String)
     */
    public void beginArray(String propertyName) throws JsonParseException
    {
        log.info(indent + "[");
        increaseIndent();

        proxy.beginArray(propertyName);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#endArray(java.lang.String)
     */
    public void endArray(String propertyName) throws JsonParseException
    {
        proxy.endArray(propertyName);

        decreaseIndent();
        log.info(indent + "]");
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#addString(java.lang.String, java.lang.String)
     */
    public void addString(String propertyName, String value) throws JsonParseException
    {
        log.info(indent + value);
        proxy.addString(propertyName, value);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#addNumber(java.lang.String, java.lang.String, java.lang.String, java.lang.String)
     */
    public void addNumber(String propertyName, String intPart, String floatPart, String expPart) throws JsonParseException
    {
        String value = intPart;
        if (floatPart != null)
        {
            value += "." + floatPart;
        }
        if (expPart != null)
        {
            value += "." + expPart;
        }
        log.info(indent + value);
        proxy.addNumber(propertyName, intPart, floatPart, expPart);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#addBoolean(java.lang.String, boolean)
     */
    public void addBoolean(String propertyName, boolean value) throws JsonParseException
    {
        log.info(indent + value);
        proxy.addBoolean(propertyName, value);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#addNull(java.lang.String)
     */
    public void addNull(String propertyName) throws JsonParseException
    {
        log.info(indent + "null");
        proxy.addNull(propertyName);
    }

    /**
     *
     */
    private void increaseIndent()
    {
        indent = indent + "  ";
    }

    /**
     *
     */
    private void decreaseIndent()
    {
        indent = indent.substring(2);
    }

    /**
     * The real {@link JsonDecoder} to which we proxy
     */
    private final JsonDecoder proxy;

    /**
     * How many levels deep are we?
     */
    private String indent = "";

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