src/dochelper/FileRenderer.java

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/*
 * FileRenderer.java
 *
 * Created on March 18, 2009, 10:11 AM
 *
 * Copyright 2009 Online Nederland Breedband B.V.
 * See the COPYRIGHT file for redistribution and use restrictions.
 * Authors: Guillermo Christen <guillermo.christen@is.online.nl>
 */
package dochelper;

import dochelper.exceptions.IllegalParamterTypeException;
import dochelper.exceptions.InitializationException;
import dochelper.exceptions.InvalidValueException;
import dochelper.exceptions.MissingArgumentException;
import dochelper.exceptions.ResourceUnavailableException;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.HashMap;
import java.util.Hashtable;

public class FileRenderer implements Renderer {
    
    /*
     * Param keys, path, glob and recursive
     */
    protected String OUTPUT_FILE = "outputfile";

    //The parameters that describe this Configurable Set
    protected HashMap<String,Object> params = new HashMap<String,Object>();
    
    //The Map of DocumentSection object to apply in this renderer
    protected Hashtable<String,DocumentSection> docsections;
    
    public FileRenderer() {
        docsections = new Hashtable<String, DocumentSection>();
    }
        
    public void setParam(String paramName, Object value) throws IllegalParamterTypeException {        
        
        if(value instanceof String)
            params.put(paramName, value);
        else
            throw new IllegalParamterTypeException(paramName);
    }         
    
    public void checkParams() throws InvalidValueException, MissingArgumentException, ResourceUnavailableException {
        
        //Validate the out file param exists
        if(!params.containsKey(OUTPUT_FILE))
            throw new MissingArgumentException(OUTPUT_FILE);
        
        
        //TODO: Check path exists
    }    
    
    public void init() throws InitializationException, ResourceUnavailableException {}    
    
    public void execute(ResultNode doc) throws ResourceUnavailableException {
        
        //Build a String based on the tree
        Writer output = null;

        //Get the output file from params
        String outfile = (String)params.get(OUTPUT_FILE);

        File file = new File( outfile);
        try {
            output = new BufferedWriter(new FileWriter(file));

            //write the output file
            String document = render(doc);
            output.write(document);
            output.close();
        }
        catch(IOException ioe) {
            throw new ResourceUnavailableException(ioe);
        }
    }
    
    public void addDocumentSection(DocumentSection docsection, String key) {
        docsections.put(key, docsection);
    }
    
    private String render(ResultNode node) {
        
        String value = "";
        
        //fetch doc section        
        DocumentSection docsection = docsections.get(node._name);        
        
        //append start
        if(docsection != null){
            //set the docsection params 
            docsection.setParams(node.getParams());            
            value = docsection.getSTART();
        }
        
        //if no children return value
        if(node.getChildren() == null || node.getChildren().size() == 0)
            return (node.getValue()!=null)?node.getValue():"";
        
        //if children recurse
        for(ResultNode child : node.getChildren()) {
            value += render(child);
        }
        
        //append end
        if(docsection != null)
            value += docsection.getEND();
        
        //return
        return value;
        
    }
        
}

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