org.apache.pdfbox.pdmodel.interactive.form.PDSignatureField Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of pdfbox Show documentation
Show all versions of pdfbox Show documentation
The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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 specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.pdmodel.interactive.form;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationWidget;
import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSeedValue;
import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature;
import java.io.IOException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* A class for handling the PDF field as a signature.
*
* @author Ben Litchfield
* @author Thomas Chojecki
* @version $Revision: 1.5 $
*/
public class PDSignatureField extends PDField
{
/**
* @see PDField#PDField(PDAcroForm,COSDictionary)
*
* @param theAcroForm The acroForm for this field.
* @param field The dictionary for the signature.
* @throws IOException If there is an error while resolving partital name for the signature field
*/
public PDSignatureField( PDAcroForm theAcroForm, COSDictionary field) throws IOException
{
super(theAcroForm,field);
// dirty hack to avoid npe caused through getWidget() method
getDictionary().setItem( COSName.TYPE, COSName.ANNOT );
getDictionary().setName( COSName.SUBTYPE, PDAnnotationWidget.SUB_TYPE);
}
/**
* @see PDField#PDField(PDAcroForm)
*
* @param theAcroForm The acroForm for this field.
* @throws IOException If there is an error while resolving partial name for the signature field
* or getting the widget object.
*/
public PDSignatureField( PDAcroForm theAcroForm) throws IOException
{
super( theAcroForm );
getDictionary().setItem(COSName.FT, COSName.SIG);
getWidget().setLocked(true);
getWidget().setPrinted(true);
setPartialName(generatePartialName());
getDictionary().setItem( COSName.TYPE, COSName.ANNOT );
getDictionary().setName( COSName.SUBTYPE, PDAnnotationWidget.SUB_TYPE);
}
/**
* Generate a unique name for the signature.
* @return the unique name for the signature
* @throws IOException If there is an error while getting the list of fields.
*/
private String generatePartialName() throws IOException
{
PDAcroForm acroForm = getAcroForm();
List fields = acroForm.getFields();
String fieldName = "Signature";
int i = 1;
Set sigNames = new HashSet();
for ( Object object : fields )
{
if(object instanceof PDSignatureField)
{
sigNames.add(((PDSignatureField)object).getPartialName());
}
}
while(sigNames.contains(fieldName+i))
{
++i;
}
return fieldName+i;
}
/**
* @see PDField#setValue(java.lang.String)
*
* @param value The new value for the field.
*
* @throws IOException If there is an error creating the appearance stream.
* @deprecated use setSignature(PDSignature) instead
*/
@Override
@Deprecated
public void setValue(String value) throws IOException
{
throw new RuntimeException( "Can't set signature as String, use setSignature(PDSignature) instead" );
}
/**
* @see PDField#setValue(java.lang.String)
*
* @return The string value of this field.
*
* @throws IOException If there is an error creating the appearance stream.
* @deprecated use getSignature() instead
*/
@Override
@Deprecated
public String getValue() throws IOException
{
throw new RuntimeException( "Can't get signature as String, use getSignature() instead." );
}
/**
* Return a string rep of this object.
*
* @return A string rep of this object.
*/
@Override
public String toString()
{
return "PDSignature";
}
/**
* Add a signature dictionary to the signature field.
*
* @param value is the PDSignature
*/
public void setSignature(PDSignature value)
{
getDictionary().setItem(COSName.V, value);
}
/**
* Get the signature dictionary.
*
* @return the signature dictionary
*
*/
public PDSignature getSignature()
{
COSBase dictionary = getDictionary().getDictionaryObject(COSName.V);
if (dictionary == null)
{
return null;
}
return new PDSignature((COSDictionary)dictionary);
}
/**
* (Optional; PDF 1.5) A seed value dictionary containing information
* that constrains the properties of a signature that is applied to the
* field.
*
* @return the seed value dictionary as PDSeedValue
*/
public PDSeedValue getSeedValue()
{
COSDictionary dict = (COSDictionary)getDictionary().getDictionaryObject(COSName.SV);
PDSeedValue sv = null;
if (dict != null)
{
sv = new PDSeedValue(dict);
}
return sv;
}
/**
* (Optional; PDF 1.) A seed value dictionary containing information
* that constrains the properties of a signature that is applied to the
* field.
*
* @param sv is the seed value dictionary as PDSeedValue
*/
public void setSeedValue(PDSeedValue sv)
{
if (sv != null)
{
getDictionary().setItem(COSName.SV, sv.getCOSObject());
}
}
}