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BTScalarAttributeHandler.java
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BTScalarAttributeHandler.java
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/*
* Copyright © 2019 Mark Raynsford <code@io7m.com> http://io7m.com
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package com.io7m.blackthorne.api;
import org.xml.sax.Attributes;
import java.util.Objects;
/**
* A convenient handler for converting the text content of attributes into scalar values.
*
* @param <S> The type of returned values
*/
public final class BTScalarAttributeHandler<S> implements BTElementHandlerType<Object, S>
{
private final BTAttributesHandlerType<S> handler;
private final BTQualifiedName name;
private S result;
/**
* Construct a handler.
*
* @param inName The name of elements handled by this handler
* @param inHandler The character handler
*/
public BTScalarAttributeHandler(
final BTQualifiedName inName,
final BTAttributesHandlerType<S> inHandler)
{
this.name = Objects.requireNonNull(inName, "name");
this.handler = Objects.requireNonNull(inHandler, "handler");
}
@Override
public String name()
{
return this.name.localName();
}
@Override
public void onElementStart(
final BTElementParsingContextType context,
final Attributes attributes)
throws Exception
{
this.result = this.handler.parse(context, attributes);
}
@Override
public S onElementFinished(
final BTElementParsingContextType context)
{
return this.result;
}
}