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/*
* 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.
*/
/* $Id$ */
package org.apache.fop.render.intermediate;
import java.util.Locale;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fop.accessibility.DummyStructureTreeEventHandler;
import org.apache.fop.accessibility.StructureTreeEventHandler;
import org.apache.fop.apps.FOUserAgent;
/**
* Abstract base class for {@link IFDocumentHandler} implementations.
*/
public abstract class AbstractIFDocumentHandler implements IFDocumentHandler {
/** logging instance */
private static Log log = LogFactory.getLog(AbstractIFDocumentHandler.class);
private final IFContext ifContext;
/**
* Default constructor.
*/
protected AbstractIFDocumentHandler(IFContext context) {
this.ifContext = context;
}
/** {@inheritDoc} */
public IFContext getContext() {
return this.ifContext;
}
/**
* Returns the associated user agent.
* @return the user agent
*/
public FOUserAgent getUserAgent() {
return getContext().getUserAgent();
}
/** {@inheritDoc} */
public StructureTreeEventHandler getStructureTreeEventHandler() {
return DummyStructureTreeEventHandler.INSTANCE;
}
/** {@inheritDoc} */
public IFDocumentNavigationHandler getDocumentNavigationHandler() {
return null; //By default, this is not supported
}
/** {@inheritDoc} */
public void startDocument() throws IFException {
if (getUserAgent() == null) {
throw new IllegalStateException(
"User agent must be set before starting document generation");
}
}
/** {@inheritDoc} */
public void setDocumentLocale(Locale locale) {
}
/** {@inheritDoc} */
public void startDocumentHeader() throws IFException {
//nop
}
/** {@inheritDoc} */
public void endDocumentHeader() throws IFException {
//nop
}
/** {@inheritDoc} */
public void startDocumentTrailer() throws IFException {
//nop
}
/** {@inheritDoc} */
public void endDocumentTrailer() throws IFException {
//nop
}
/** {@inheritDoc} */
public void startPageHeader() throws IFException {
//nop
}
/** {@inheritDoc} */
public void endPageHeader() throws IFException {
//nop
}
/** {@inheritDoc} */
public void startPageTrailer() throws IFException {
//nop
}
/** {@inheritDoc} */
public void endPageTrailer() throws IFException {
//nop
}
}
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