org.apache.padaf.preflight.PdfA1bValidator.java Source code

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Here is the source code for org.apache.padaf.preflight.PdfA1bValidator.java

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/*****************************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
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package org.apache.padaf.preflight;

import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

import javax.activation.DataSource;

import org.apache.padaf.preflight.javacc.PDFParser;
import org.apache.padaf.preflight.javacc.ParseException;
import org.apache.padaf.preflight.javacc.extractor.ExtractorTokenManager;
import org.apache.padaf.preflight.javacc.extractor.SimpleCharStream;

import org.apache.padaf.preflight.ValidationResult.ValidationError;
import org.apache.padaf.preflight.helpers.AbstractValidationHelper;
import org.apache.pdfbox.pdmodel.PDDocument;

public class PdfA1bValidator extends AbstractValidator {

    public PdfA1bValidator(ValidatorConfig cfg) throws ValidationException {
        super(cfg);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * net.awl.edoc.pdfa.validation.PdfAValidator#validate(javax.activation.DataSource
     * )
     */
    public synchronized ValidationResult validate(DataSource source) throws ValidationException {
        DocumentHandler handler = createDocumentHandler(source);
        try {
            ArrayList<ValidationError> allErrors = new ArrayList<ValidationError>();

            // syntax (javacc) validation
            try {
                InputStreamReader reader = new InputStreamReader(source.getInputStream(), encoding);

                PDFParser parser = new PDFParser(reader);
                handler.setParser(parser);
                parser.PDF();
            } catch (IOException e) {
                throw new ValidationException("Failed to parse datasource due to : " + e.getMessage(), e);
            } catch (ParseException e) {
                allErrors.addAll(createErrorResult(e).getErrorsList());
            }

            // if here is reached, validate with helpers
            // init PDF Box document
            PDDocument document = null;
            try {
                document = PDDocument.load(handler.getSource().getInputStream());
                handler.setDocument(document);
            } catch (IOException e) {
                throw new ValidationException("PDFBox failed to parse datasource", e);
            }

            // init PDF Extractor
            try {
                SimpleCharStream scs = new SimpleCharStream(source.getInputStream());
                ExtractorTokenManager extractor = new ExtractorTokenManager(scs);
                extractor.parse();
                handler.setPdfExtractor(extractor);
            } catch (IOException e) {
                throw new ValidationException("PDF ExtractorTokenMng failed to parse datasource", e);
            }

            /* 
             * call all helpers
             */

            // Execute priority helpers.
            for (AbstractValidationHelper helper : priorHelpers) {
                runValidation(handler, helper, allErrors);
            }

            // Execute other helpers.
            for (AbstractValidationHelper helper : standHelpers) {
                runValidation(handler, helper, allErrors);
            }

            // check result
            ValidationResult valRes = null;
            if (allErrors.size() == 0) {
                valRes = new ValidationResult(true);
            } else {
                // there are some errors
                valRes = new ValidationResult(allErrors);
            }

            // addition of the some objects to avoid a second file parsing  
            valRes.setPdf(document);
            valRes.setXmpMetaData(handler.getMetadata());
            return valRes;
        } catch (ValidationException e) {
            // ---- Close all open resources if an error occurs.
            handler.close();
            throw e;
        }
    }

}