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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.ps;
/**
* Postscript page device dictionary object
*
* This object is used by the postscript renderer to hold postscript page device
* values. It can also be used to minimize the number of setpagedevice calls when
* DSC compliance is false.
*/
public class PSPageDeviceDictionary extends PSDictionary {
private static final long serialVersionUID = 845943256485806509L;
/**
* Whether or not the contents of the dictionary are flushed on retrieval
*/
private boolean flushOnRetrieval = false;
/**
* Dictionary content that has not been output/written yet
*/
private PSDictionary unRetrievedContentDictionary;
/**
* @param key key with which the specified value is to be associated.
* @param value value to be associated with the specified key.
* @return the previous value associated with the key or null
* @see java.util.Map#put(Object, Object)
*/
public Object put(Object key, Object value) {
Object previousValue = super.put(key, value);
if (flushOnRetrieval) {
if (previousValue == null || !previousValue.equals(value)) {
unRetrievedContentDictionary.put(key, value);
}
}
return previousValue;
}
/**
* @see java.util.Map#clear()
*/
public void clear() {
super.clear();
if (unRetrievedContentDictionary != null) {
unRetrievedContentDictionary.clear();
}
}
/**
* Returns <tt>true</tt> if this map contains no key-value mappings.
*
* @return <tt>true</tt> if this map contains no key-value mappings.
*/
public boolean isEmpty() {
if (flushOnRetrieval) {
return unRetrievedContentDictionary.isEmpty();
}
return super.isEmpty();
}
/**
* The contents of the dictionary are flushed when written
* @param flushOnRetrieval boolean value
*/
public void setFlushOnRetrieval(boolean flushOnRetrieval) {
this.flushOnRetrieval = flushOnRetrieval;
if (flushOnRetrieval) {
unRetrievedContentDictionary = new PSDictionary();
}
}
/**
* Returns a dictionary string with containing all unwritten content note:
* unnecessary writes are important as there is a device specific
* initgraphics call by the underlying postscript interpreter on every
* setpagedevice call which can result in blank pages etc.
*
* @return unwritten content dictionary string
*/
public String getContent() {
String content;
if (flushOnRetrieval) {
content = unRetrievedContentDictionary.toString();
unRetrievedContentDictionary.clear();
} else {
content = super.toString();
}
return content;
}
}
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