org.apache.pdfbox.pdmodel.interactive.form.PDFieldFactory 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.COSDictionary;
import java.io.IOException;
/**
* This is the Factory for creating and returning the correct
* field elements.
*
* @author sug
* @version $Revision: 1.8 $
*/
public class PDFieldFactory
{
private static final int RADIO_BITMASK = 32768;
private static final int PUSHBUTTON_BITMASK = 65536;
private static final String FIELD_TYPE_BTN = "Btn";
private static final String FIELD_TYPE_TX = "Tx";
private static final String FIELD_TYPE_CH = "Ch";
private static final String FIELD_TYPE_SIG = "Sig";
/**
* Utility class so no constructor.
*/
private PDFieldFactory()
{
//do nothing.
}
/**
* This method creates a COSField subclass from the given field.
* The field is a PDF Dictionary object that must represent a
* field element. - othewise null is returned
*
* @param acroForm The form that the field will be part of.
* @param field The dictionary representing a field element
*
* @return a subclass to COSField according to the kind of field passed to createField
* @throws IOException If there is an error determining the field type.
*/
public static PDField createField( PDAcroForm acroForm, COSDictionary field) throws IOException
{
PDField pdField = new PDUnknownField( acroForm, field );
if( isButton(pdField) )
{
int flags = pdField.getFieldFlags();
if(isRadio(flags) )
{
pdField = new PDRadioCollection( acroForm, field );
}
else if( isPushButton( flags ) )
{
pdField = new PDPushButton( acroForm, field );
}
else
{
pdField = new PDCheckbox( acroForm, field );
}
}
else if (isChoiceField(pdField))
{
pdField = new PDChoiceField( acroForm, field );
}
else if (isTextbox(pdField))
{
pdField = new PDTextbox( acroForm, field );
}
else if( isSignature( pdField ) )
{
pdField = new PDSignatureField( acroForm, field );
}
else
{
//do nothing and return an unknown field type.
}
return pdField;
}
/**
* This method determines if the given
* field is a radiobutton collection.
*
* @param flags The field flags.
*
* @return the result of the determination
*/
private static boolean isRadio( int flags )
{
return (flags & RADIO_BITMASK) > 0;
}
/**
* This method determines if the given
* field is a pushbutton.
*
* @param flags The field flags.
*
* @return the result of the determination
*/
private static boolean isPushButton( int flags )
{
return (flags & PUSHBUTTON_BITMASK) > 0;
}
/**
* This method determines if the given field is a choicefield
* Choicefields are either listboxes or comboboxes.
*
* @param field the field to determine
* @return the result of the determination
*/
private static boolean isChoiceField(PDField field) throws IOException
{
return FIELD_TYPE_CH.equals(field.findFieldType());
}
/**
* This method determines if the given field is a button.
*
* @param field the field to determine
* @return the result of the determination
*
* @throws IOException If there is an error determining the field type.
*/
private static boolean isButton(PDField field) throws IOException
{
String ft = field.findFieldType();
return FIELD_TYPE_BTN.equals( ft );
}
/**
* This method determines if the given field is a signature.
*
* @param field the field to determine
* @return the result of the determination
*/
private static boolean isSignature(PDField field) throws IOException
{
return FIELD_TYPE_SIG.equals(field.findFieldType());
}
/**
* This method determines if the given field is a Textbox.
*
* @param field the field to determine
* @return the result of the determination
*/
private static boolean isTextbox(PDField field) throws IOException
{
return FIELD_TYPE_TX.equals(field.findFieldType());
}
}