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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 java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.common.COSArrayList;
import org.apache.pdfbox.util.BitFlagHelper;
/**
* A class for handling the PDF field as a Radio Collection.
* This class automatically keeps track of the child radio buttons
* in the collection.
*
* @see PDCheckbox
* @author sug
* @version $Revision: 1.13 $
*/
public class PDRadioCollection extends PDChoiceButton
{
/**
* A Ff flag.
*/
public static final int FLAG_RADIOS_IN_UNISON = 1 << 25;
/**
* @param theAcroForm The acroForm for this field.
* @param field The field that makes up the radio collection.
*
* {@inheritDoc}
*/
public PDRadioCollection( PDAcroForm theAcroForm, COSDictionary field)
{
super(theAcroForm,field);
}
/**
* From the PDF Spec
* If set, a group of radio buttons within a radio button field that
* use the same value for the on state will turn on and off in unison; that is if
* one is checked, they are all checked. If clear, the buttons are mutually exclusive
* (the same behavior as HTML radio buttons).
*
* @param radiosInUnison The new flag for radiosInUnison.
*/
public void setRadiosInUnison(boolean radiosInUnison)
{
BitFlagHelper.setFlag( getDictionary(), COSName.FF, FLAG_RADIOS_IN_UNISON, radiosInUnison );
}
/**
*
* @return true If the flag is set for radios in unison.
*/
public boolean isRadiosInUnison()
{
return BitFlagHelper.getFlag( getDictionary(), COSName.FF, FLAG_RADIOS_IN_UNISON );
}
/**
* This setValue method iterates the collection of radiobuttons
* and checks or unchecks each radiobutton according to the
* given value.
* If the value is not represented by any of the radiobuttons,
* then none will be checked.
*
* {@inheritDoc}
*/
public void setValue(String value) throws IOException
{
getDictionary().setString( COSName.V, value );
List kids = getKids();
for (int i = 0; i < kids.size(); i++)
{
PDField field = (PDField)kids.get(i);
if ( field instanceof PDCheckbox )
{
PDCheckbox btn = (PDCheckbox)field;
if( btn.getOnValue().equals(value) )
{
btn.check();
}
else
{
btn.unCheck();
}
}
}
}
/**
* getValue gets the fields value to as a string.
*
* @return The string value of this field.
*
* @throws IOException If there is an error getting the value.
*/
public String getValue()throws IOException
{
String retval = null;
List kids = getKids();
for (int i = 0; i < kids.size(); i++)
{
PDField kid = (PDField)kids.get(i);
if ( kid instanceof PDCheckbox )
{
PDCheckbox btn = (PDCheckbox)kid;
if( btn.isChecked() )
{
retval = btn.getOnValue();
}
}
}
if( retval == null )
{
retval = getDictionary().getNameAsString( COSName.V );
}
return retval;
}
/**
* This will return a list of PDField objects that are part of this radio collection.
*
* @see PDField#getWidget()
* @return A list of PDWidget objects.
* @throws IOException if there is an error while creating the children objects.
*/
@SuppressWarnings("unchecked")
public List getKids() throws IOException
{
COSArray kids = (COSArray)getDictionary().getDictionaryObject(COSName.KIDS);
if( kids != null )
{
List kidsList = new ArrayList();
for (int i = 0; i < kids.size(); i++)
{
PDField field = PDFieldFactory.createField( getAcroForm(), (COSDictionary)kids.getObject(i) );
if( field != null )
{
kidsList.add( field );
}
}
return new COSArrayList( kidsList, kids );
}
else
{
return new ArrayList();
}
}
}