net.padaf.preflight.helpers.GraphicsValidationHelper.java Source code

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Here is the source code for net.padaf.preflight.helpers.GraphicsValidationHelper.java

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/*******************************************************************************
 * Copyright 2010 Atos Worldline SAS
 * 
 * Licensed by Atos Worldline SAS under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * Atos Worldline SAS 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 specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
/**
 * 
 */
package net.padaf.preflight.helpers;

import java.util.ArrayList;
import java.util.List;

import net.padaf.preflight.DocumentHandler;
import net.padaf.preflight.ValidationException;
import net.padaf.preflight.ValidatorConfig;
import net.padaf.preflight.ValidationResult.ValidationError;
import net.padaf.preflight.graphics.ShadingPattern;
import net.padaf.preflight.graphics.TilingPattern;
import net.padaf.preflight.graphics.XObjFormValidator;
import net.padaf.preflight.graphics.XObjImageValidator;
import net.padaf.preflight.graphics.XObjPostscriptValidator;
import net.padaf.preflight.graphics.XObjectValidator;

import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSDocument;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSObject;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdmodel.PDDocument;

/**
 * @author eric
 * 
 */
public class GraphicsValidationHelper extends AbstractValidationHelper {

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

    /*
     * (non-Javadoc)
     * 
     * @see
     * net.awl.edoc.pdfa.validation.helpers.AbstractValidationHelper#innerValidate
     * (net.awl.edoc.pdfa.validation.DocumentHandler)
     */
    @Override
    public List<ValidationError> innerValidate(DocumentHandler handler) throws ValidationException {
        List<ValidationError> result = new ArrayList<ValidationError>(0);
        PDDocument pdfDoc = handler.getDocument();

        // ---- Checks all XObjects
        COSDocument cDoc = pdfDoc.getDocument();
        List<?> lCOSObj = cDoc.getObjects();
        for (Object o : lCOSObj) {
            COSObject cObj = (COSObject) o;
            COSBase cBase = cObj.getObject();
            if (cBase instanceof COSDictionary) {
                COSDictionary dic = (COSDictionary) cBase;
                String type = dic.getNameAsString(COSName.getPDFName(DICTIONARY_KEY_TYPE));
                if (type != null && DICTIONARY_KEY_XOBJECT.equals(type)) {
                    result.addAll(validateXObject(handler, cObj));
                } else if (type != null && DICTIONARY_KEY_PATTERN.equals(type)) {
                    result.addAll(validatePattern(handler, cObj));
                }
            }
        }
        return result;
    }

    public List<ValidationError> validatePattern(DocumentHandler handler, COSObject cObj)
            throws ValidationException {
        COSDictionary cosPattern = (COSDictionary) cObj.getObject();
        int ptype = cosPattern.getInt(DICTIONARY_KEY_PATTERN_TYPE);

        XObjectValidator validator = null;

        switch (ptype) {
        case DICTIONARY_PATTERN_TILING:
            validator = new TilingPattern(handler, (COSStream) cosPattern);
            break;
        case DICTIONARY_PATTERN_SHADING:
            validator = new ShadingPattern(handler, cosPattern);
            break;
        default:
            throw new ValidationException("Unkown pattern type : " + ptype);
        }

        return validator.validate();
    }

    public List<ValidationError> validateXObject(DocumentHandler handler, COSObject cObj)
            throws ValidationException {
        XObjectValidator xObjVal = null;

        // ---- According to the XObject subtype, the validation isn't processed by
        // the same Validator
        COSStream dic = (COSStream) cObj.getObject();
        String subtype = dic.getNameAsString(COSName.getPDFName(DICTIONARY_KEY_SUBTYPE));

        if (XOBJECT_DICTIONARY_VALUE_SUBTYPE_IMG.equals(subtype)) {
            xObjVal = new XObjImageValidator(handler, dic);
        } else if (XOBJECT_DICTIONARY_VALUE_SUBTYPE_FORM.equals(subtype)) {
            xObjVal = new XObjFormValidator(handler, dic);
        } else if (XOBJECT_DICTIONARY_VALUE_SUBTYPE_POSTSCRIPT.equals(subtype)) {
            xObjVal = new XObjPostscriptValidator(handler, dic);
        } else {
            throw new ValidationException("Invalid XObject subtype");
        }

        return xObjVal.validate();
    }

}