RandomSec/main/src/com/google/refine/exporters/TemplatingExporter.java

/*

Copyright 2010, Google Inc.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
    * Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY           
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*/

package com.google.refine.exporters;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Properties;

import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;

import com.google.refine.browsing.Engine;
import com.google.refine.browsing.Engine.Mode;
import com.google.refine.browsing.FilteredRecords;
import com.google.refine.browsing.FilteredRows;
import com.google.refine.browsing.RecordVisitor;
import com.google.refine.browsing.RowVisitor;
import com.google.refine.expr.ParsingException;
import com.google.refine.model.Project;
import com.google.refine.sorting.SortingConfig;
import com.google.refine.sorting.SortingRecordVisitor;
import com.google.refine.sorting.SortingRowVisitor;
import com.google.refine.templating.Parser;
import com.google.refine.templating.Template;
import com.google.refine.util.ParsingUtilities;

public class TemplatingExporter implements WriterExporter {

    @Override
    public String getContentType() {
        return "application/x-unknown";
    }

    @Override
    public void export(Project project, Properties options, Engine engine, Writer writer) throws IOException {
        String limitString = options.getProperty("limit");
        int limit = limitString != null ? Integer.parseInt(limitString) : -1;
        
        JSONObject sortingJson = null;
        try{
            String json = options.getProperty("sorting");
            sortingJson = (json == null) ? null : 
                ParsingUtilities.evaluateJsonStringToObject(json);
        } catch (JSONException e) {
        }
        
        String templateString = options.getProperty("template");
        String prefixString = options.getProperty("prefix");
        String suffixString = options.getProperty("suffix");
        String separatorString = options.getProperty("separator");
        
        Template template;
        try {
            template = Parser.parse(templateString);
        } catch (ParsingException e) {
            throw new IOException("Missing or bad template", e);
        }
        
        template.setPrefix(prefixString);
        template.setSuffix(suffixString);
        template.setSeparator(separatorString);
        
        if (!"true".equals(options.getProperty("preview"))) {
            StringWriter stringWriter = new StringWriter();
            JSONWriter jsonWriter = new JSONWriter(stringWriter);
            try {
                jsonWriter.object();
                jsonWriter.key("template"); jsonWriter.value(templateString);
                jsonWriter.key("prefix"); jsonWriter.value(prefixString);
                jsonWriter.key("suffix"); jsonWriter.value(suffixString);
                jsonWriter.key("separator"); jsonWriter.value(separatorString);
                jsonWriter.endObject();
            } catch (JSONException e) {
                // ignore
            }
            
            project.getMetadata().getPreferenceStore().put("exporters.templating.template", stringWriter.toString());
        }
        
        if (engine.getMode() == Mode.RowBased) {
            FilteredRows filteredRows = engine.getAllFilteredRows();
            RowVisitor visitor = template.getRowVisitor(writer, limit);
            
            if (sortingJson != null) {
                try {
                    SortingConfig sorting = SortingConfig.reconstruct(sortingJson);
                    SortingRowVisitor srv = new SortingRowVisitor(visitor);
                    srv.initializeFromConfig(project, sorting);
                    
                    if (srv.hasCriteria()) {
                        visitor = srv;
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
            
            filteredRows.accept(project, visitor);
        } else {
            FilteredRecords filteredRecords = engine.getFilteredRecords();
            RecordVisitor visitor = template.getRecordVisitor(writer, limit);
            
            if (sortingJson != null) {
                try {
                    SortingConfig sorting = SortingConfig.reconstruct(sortingJson);
                    SortingRecordVisitor srv = new SortingRecordVisitor(visitor);
                    srv.initializeFromConfig(project, sorting);
                    
                    if (srv.hasCriteria()) {
                        visitor = srv;
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
            
            filteredRecords.accept(project, visitor);
        }
    }
    
}