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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.afp.modca;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Collection;
import java.util.Iterator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* This is the base class for all data stream objects. Page objects are
* responsible for building and generating the binary datastream in an
* AFP format.
*
*/
public abstract class AbstractAFPObject {
/**
* Static logging instance
*/
protected static final Log log = LogFactory.getLog("org.apache.fop.render.afp.modca");
/**
* DataStream objects must implement the writeDataStream()
* method to write its data to the given OutputStream
* @param os The outputsteam stream
* @throws java.io.IOException an I/O exception of some sort has occurred.
*/
public abstract void writeDataStream(OutputStream os) throws IOException;
/**
* Help method to write a set of AFPObjects to the AFP datastream.
* @param objects a list of AFPObjects
* @param os The stream to write to
* @throws java.io.IOException an I/O exception of some sort has occurred.
*/
protected void writeObjects(Collection/*<AbstractAFPObject>*/ objects, OutputStream os)
throws IOException {
if (objects != null) {
for (Iterator it = objects.iterator(); it.hasNext();) {
AbstractAFPObject obj = (AbstractAFPObject)it.next();
obj.writeDataStream(os);
}
}
}
}
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