Example usage for com.itextpdf.text.pdf AcroFields regenerateField

Introduction

In this page you can find the example usage for com.itextpdf.text.pdf AcroFields regenerateField.

Prototype

public boolean regenerateField(String name) throws IOException, DocumentException 

Source Link

Document

Regenerates the field appearance.

Usage

From source file:org.alfresco.extension.countersign.action.executer.PDFAddSignatureFieldActionExecuter.java

License:Open Source License

/**
 * @see org.alfresco.repo.action.executer.ActionExecuterAbstractBase#executeImpl(org.alfresco.service.cmr.repository.NodeRef,
 * org.alfresco.service.cmr.repository.NodeRef)
 *///from w w w .  j  av  a 2s .  c o m
protected void executeImpl(Action ruleAction, NodeRef actionedUponNodeRef) {

    NodeService ns = serviceRegistry.getNodeService();
    if (ns.exists(actionedUponNodeRef) == false) {
        // node doesn't exist - can't do anything
        return;
    }

    String fieldName = (String) ruleAction.getParameterValue(PARAM_FIELDNAME);
    String position = (String) ruleAction.getParameterValue(PARAM_POSITION);

    JSONObject box;
    int page = -1;

    // parse out the position JSON
    JSONObject positionObj = null;

    try {
        positionObj = (JSONObject) parser.parse(position);
    } catch (ParseException e) {
        logger.error("Could not parse position JSON from Share");
        throw new AlfrescoRuntimeException("Could not parse position JSON from Share");
    }

    // get the page
    page = Integer.parseInt(String.valueOf(positionObj.get("page")));

    // get the box
    box = (JSONObject) positionObj.get("box");

    try {
        // open original pdf
        ContentReader pdfReader = getReader(actionedUponNodeRef);
        PdfReader reader = new PdfReader(pdfReader.getContentInputStream());
        OutputStream cos = serviceRegistry.getContentService()
                .getWriter(actionedUponNodeRef, ContentModel.PROP_CONTENT, true).getContentOutputStream();

        PdfStamper stamp = new PdfStamper(reader, cos);

        // does a field with this name already exist?
        AcroFields allFields = stamp.getAcroFields();

        // if this doc is already signed, cannot add a new sig field without 
        if (allFields.getSignatureNames() != null && allFields.getSignatureNames().size() > 0) {
            throw new AlfrescoRuntimeException("This document has signatures applied, "
                    + "adding a new signature field would invalidate existing signatures");
        }

        // cant create duplicate field names
        if (allFields.getFieldType(fieldName) == AcroFields.FIELD_TYPE_SIGNATURE) {
            throw new AlfrescoRuntimeException(
                    "A signature field named " + fieldName + " already exists in this document");
        }

        // create the signature field
        Rectangle pageRect = reader.getPageSizeWithRotation(page);
        Rectangle sigRect = positionBlock(pageRect, box);
        PdfFormField sigField = stamp.addSignature(fieldName, page, sigRect.getLeft(), sigRect.getBottom(),
                sigRect.getRight(), sigRect.getTop());

        // style the field (no borders)
        sigField.setBorder(new PdfBorderArray(0, 0, 0));
        sigField.setBorderStyle(new PdfBorderDictionary(0, PdfBorderDictionary.STYLE_SOLID));
        allFields.regenerateField(fieldName);

        // apply the change and close streams
        stamp.close();
        reader.close();
        cos.close();

        // once the signature field has been added, apply the sig field aspect
        if (!ns.hasAspect(actionedUponNodeRef, CounterSignSignatureModel.ASPECT_SIGNABLE)) {
            ns.addAspect(actionedUponNodeRef, CounterSignSignatureModel.ASPECT_SIGNABLE, null);
        }

        // now update the signature fields metadata
        Serializable currentFields = ns.getProperty(actionedUponNodeRef,
                CounterSignSignatureModel.PROP_SIGNATUREFIELDS);
        ArrayList<String> fields = new ArrayList<String>();

        if (currentFields != null) {
            fields.addAll((List<String>) currentFields);
        }

        fields.add(fieldName);
        ns.setProperty(actionedUponNodeRef, CounterSignSignatureModel.PROP_SIGNATUREFIELDS, fields);
    } catch (IOException ioex) {
        throw new AlfrescoRuntimeException(ioex.getMessage());
    } catch (DocumentException dex) {
        throw new AlfrescoRuntimeException(dex.getMessage());
    }
}

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