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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.area.inline;
import org.apache.fop.area.PageViewport;
import org.apache.fop.area.Resolvable;
import org.apache.fop.fonts.Font;
import java.util.List;
/**
* Unresolvable page number area.
* This is a word area that resolves itself to a page number
* from an id reference.
*/
public class UnresolvedPageNumber extends TextArea implements Resolvable {
private boolean resolved = false;
private String pageIDRef;
private String text;
private boolean pageType;
/** Indicates that the reference refers to the first area generated by a formatting object. */
public static final boolean FIRST = true;
/** Indicates that the reference refers to the last area generated by a formatting object. */
public static final boolean LAST = false;
//Transient fields
private transient Font font;
/**
* Create a new unresolved page number.
*
* @param id the id reference for resolving this
* @param f the font for formatting the page number
*/
public UnresolvedPageNumber(String id, Font f) {
this(id, f, FIRST);
}
/**
* Create a new unresolved page number.
*
* @param id the id reference for resolving this
* @param f the font for formatting the page number
* @param type indicates whether the reference refers to the first or last area generated by
* a formatting object
*/
public UnresolvedPageNumber(String id, Font f, boolean type) {
pageIDRef = id;
font = f;
text = "?";
pageType = type;
}
/**
* Get the id references for this area.
*
* @return the id reference for this unresolved page number
*/
public String[] getIDRefs() {
return new String[] {pageIDRef};
}
/**
* Resolve the page number idref
* This resolves the idref for this object by getting the page number
* string from the first page in the list of pages that apply
* for this ID. The page number text is then set to the String value
* of the page number.
*
* @param id an id whose PageViewports have been determined
* @param pages the list of PageViewports associated with this ID
*/
public void resolveIDRef(String id, List pages) {
if (!resolved && pageIDRef.equals(id) && pages != null) {
if (log.isDebugEnabled()) {
log.debug("Resolving pageNumber: " + id);
}
resolved = true;
PageViewport page;
if (pageType == FIRST) {
page = (PageViewport)pages.get(0);
} else {
page = (PageViewport)pages.get(pages.size() - 1);
}
// replace the text
removeText();
text = page.getPageNumberString();
addWord(text, 0);
// update ipd
if (font != null) {
handleIPDVariation(font.getWordWidth(text) - getIPD());
// set the Font object to null, as we don't need it any more
font = null;
} else {
log.warn("Cannot update the IPD of an unresolved page number."
+ " No font information available.");
}
}
}
/**
* Check if this is resolved.
*
* @return true when this has been resolved
*/
public boolean isResolved() {
return resolved;
}
/**
* recursively apply the variation factor to all descendant areas
* @param variationFactor the variation factor that must be applied to adjustment ratios
* @param lineStretch the total stretch of the line
* @param lineShrink the total shrink of the line
* @return true if there is an UnresolvedArea descendant
*/
public boolean applyVariationFactor(double variationFactor,
int lineStretch, int lineShrink) {
return true;
}
}
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