org.apache.xmlgraphics.ps.dsc.DefaultNestedDocumentHandler Maven / Gradle / Ivy
/*
* 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: DefaultNestedDocumentHandler.java 1614048 2014-07-28 15:16:47Z vhennebert $ */
package org.apache.xmlgraphics.ps.dsc;
import java.io.IOException;
import org.apache.xmlgraphics.ps.DSCConstants;
import org.apache.xmlgraphics.ps.PSGenerator;
import org.apache.xmlgraphics.ps.dsc.events.DSCComment;
import org.apache.xmlgraphics.ps.dsc.events.DSCEvent;
/**
* {@link DSCListener} implementation which automatically skips data
* between Begin/EndDocument and Begin/EndData.
*/
public class DefaultNestedDocumentHandler implements DSCParserConstants,
NestedDocumentHandler, DSCListener {
private PSGenerator gen;
/**
* Creates a new instance.
* @param gen PSGenerator to pass through the skipped content
*/
public DefaultNestedDocumentHandler(PSGenerator gen) {
this.gen = gen;
}
/** {@inheritDoc} */
public void handle(DSCEvent event, DSCParser parser) throws IOException, DSCException {
processEvent(event, parser);
}
/** {@inheritDoc} */
public void processEvent(DSCEvent event, DSCParser parser) throws IOException, DSCException {
if (event.isDSCComment()) {
DSCComment comment = event.asDSCComment();
if (DSCConstants.BEGIN_DOCUMENT.equals(comment.getName())) {
if (gen != null) {
comment.generate(gen);
}
boolean checkEOF = parser.isCheckEOF();
parser.setCheckEOF(false);
parser.setListenersDisabled(true);
comment = parser.nextDSCComment(DSCConstants.END_DOCUMENT, gen);
if (comment == null) {
throw new DSCException("File is not DSC-compliant: Didn't find an "
+ DSCConstants.END_DOCUMENT);
}
if (gen != null) {
comment.generate(gen);
}
parser.setCheckEOF(checkEOF);
parser.setListenersDisabled(false);
parser.next();
} else if (DSCConstants.BEGIN_DATA.equals(comment.getName())) {
if (gen != null) {
comment.generate(gen);
}
boolean checkEOF = parser.isCheckEOF();
parser.setCheckEOF(false);
parser.setListenersDisabled(true);
comment = parser.nextDSCComment(DSCConstants.END_DATA, gen);
if (comment == null) {
throw new DSCException("File is not DSC-compliant: Didn't find an "
+ DSCConstants.END_DATA);
}
if (gen != null) {
comment.generate(gen);
}
parser.setCheckEOF(checkEOF);
parser.setListenersDisabled(false);
parser.next();
}
}
}
}