org.apache.pdfbox.pdmodel.interactive.form.PDCheckBox Maven / Gradle / Ivy
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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.Set;
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.annotation.PDAppearanceDictionary;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceEntry;
/**
* A check box toggles between two states, on and off.
*
* @author Ben Litchfield
* @author sug
*/
public final class PDCheckBox extends PDButton
{
/**
* @see PDField#PDField(PDAcroForm)
*
* @param acroForm The acroform.
*/
public PDCheckBox(PDAcroForm acroForm)
{
super(acroForm);
}
/**
* Constructor.
*
* @param acroForm The form that this field is part of.
* @param field the PDF object to represent as a field.
* @param parent the parent node of the node
*/
PDCheckBox(PDAcroForm acroForm, COSDictionary field, PDNonTerminalField parent)
{
super(acroForm, field, parent);
}
/**
* This will tell if this radio button is currently checked or not.
* This is equivalent to calling {@link #getValue()}.
*
* @return true If this field is checked.
*/
public boolean isChecked()
{
return getValue().compareTo(getOnValue()) == 0;
}
/**
* Checks the check box.
*
* @throws IOException if the appearance couldn't be generated.
*/
public void check() throws IOException
{
setValue(getOnValue());
}
/**
* Unchecks the check box.
*
* @throws IOException if the appearance couldn't be generated.
*/
public void unCheck() throws IOException
{
setValue(COSName.Off.getName());
}
/**
* Get the value which sets the check box to the On state.
*
* The On value should be 'Yes' but other values are possible
* so we need to look for that. On the other hand the Off value shall
* always be 'Off'. If not set or not part of the normal appearance keys
* 'Off' is the default
*
* @return the value setting the check box to the On state.
* If an empty string is returned there is no appearance definition.
*/
public String getOnValue()
{
PDAnnotationWidget widget = this.getWidgets().get(0);
PDAppearanceDictionary apDictionary = widget.getAppearance();
String onValue = "";
if (apDictionary != null)
{
PDAppearanceEntry normalAppearance = apDictionary.getNormalAppearance();
if (normalAppearance != null)
{
Set entries = normalAppearance.getSubDictionary().keySet();
for (COSName entry : entries)
{
if (COSName.Off.compareTo(entry) != 0)
{
onValue = entry.getName();
}
}
}
}
return onValue;
}
}