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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.cos;
import java.io.IOException;
import java.io.OutputStream;
/**
* This class represents a boolean value in the PDF document.
*
* @author Ben Litchfield
*/
public final class COSBoolean extends COSBase
{
/**
* The true boolean token.
*/
public static final byte[] TRUE_BYTES = new byte[]{ 116, 114, 117, 101 }; //"true".getBytes( "ISO-8859-1" );
/**
* The false boolean token.
*/
public static final byte[] FALSE_BYTES = new byte[]{ 102, 97, 108, 115, 101 }; //"false".getBytes( "ISO-8859-1" );
/**
* The PDF true value.
*/
public static final COSBoolean TRUE = new COSBoolean( true );
/**
* The PDF false value.
*/
public static final COSBoolean FALSE = new COSBoolean( false );
private final boolean value;
/**
* Constructor.
*
* @param aValue The boolean value.
*/
private COSBoolean(boolean aValue)
{
value = aValue;
}
/**
* This will get the value that this object wraps.
*
* @return The boolean value of this object.
*/
public boolean getValue()
{
return value;
}
/**
* This will get the value that this object wraps.
*
* @return The boolean value of this object.
*/
public Boolean getValueAsObject()
{
return (value?Boolean.TRUE:Boolean.FALSE);
}
/**
* This will get the boolean value.
*
* @param value Parameter telling which boolean value to get.
*
* @return The single boolean instance that matches the parameter.
*/
public static COSBoolean getBoolean( boolean value )
{
return (value?TRUE:FALSE);
}
/**
* This will get the boolean value.
*
* @param value Parameter telling which boolean value to get.
*
* @return The single boolean instance that matches the parameter.
*/
public static COSBoolean getBoolean( Boolean value )
{
return getBoolean( value.booleanValue() );
}
/**
* visitor pattern double dispatch method.
*
* @param visitor The object to notify when visiting this object.
* @return any object, depending on the visitor implementation, or null
* @throws IOException If an error occurs while visiting this object.
*/
@Override
public Object accept(ICOSVisitor visitor) throws IOException
{
return visitor.visitFromBoolean(this);
}
/**
* Return a string representation of this object.
*
* @return The string value of this object.
*/
@Override
public String toString()
{
return String.valueOf( value );
}
/**
* This will write this object out to a PDF stream.
*
* @param output The stream to write this object out to.
*
* @throws IOException If an error occurs while writing out this object.
*/
public void writePDF( OutputStream output ) throws IOException
{
if( value )
{
output.write( TRUE_BYTES );
}
else
{
output.write( FALSE_BYTES );
}
}
}