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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.fo.flow;
// Java
import java.util.List;
// XML
import org.xml.sax.Attributes;
import org.xml.sax.Locator;
import org.xml.sax.SAXParseException;
// FOP
import org.apache.fop.fo.FONode;
import org.apache.fop.layoutmgr.BasicLinkLayoutManager;
/**
* The fo:basic-link formatting object.
*
* This class contains the logic to determine the link represented by this FO,
* and whether that link is external (uses a URI) or internal (an id
* reference).
*/
public class BasicLink extends Inline {
// link represented by this FO
private String link = null;
// indicator of whether link is internal or external
private boolean isExternalLink = false;
// used only for FO validation
private boolean blockOrInlineItemFound = false;
/**
* @param parent FONode that is the parent of this object
*/
public BasicLink(FONode parent) {
super(parent);
}
/**
* @see org.apache.fop.fo.FObj#addProperties
*/
protected void addProperties(Attributes attlist) throws SAXParseException {
super.addProperties(attlist);
// This logic is for determining the link represented by this FO.
String ext = propertyList.get(PR_EXTERNAL_DESTINATION).getString();
String internal = propertyList.get(PR_INTERNAL_DESTINATION).getString();
// per spec, internal takes precedence if both specified
if (internal.length() > 0) {
link = internal;
} else if (ext.length() > 0) {
link = ext;
isExternalLink = true;
} else {
// slightly stronger than spec "should be specified"
attributeError("Missing attribute: Either external-destination or " +
"internal-destination must be specified.");
}
getFOEventHandler().startLink(this);
}
/**
* @see org.apache.fop.fo.FONode#validateChildNode(Locator, String, String)
* XSL Content Model: marker* (#PCDATA|%inline;|%block;)*
*/
protected void validateChildNode(Locator loc, String nsURI, String localName)
throws SAXParseException {
if (nsURI == FO_URI && localName.equals("marker")) {
if (blockOrInlineItemFound) {
nodesOutOfOrderError(loc, "fo:marker", "(#PCDATA|%inline;|%block;)");
}
} else if (!isBlockOrInlineItem(nsURI, localName)) {
invalidChildError(loc, nsURI, localName);
} else {
blockOrInlineItemFound = true;
}
}
/**
* @see org.apache.fop.fo.FONode#endOfNode
*/
protected void endOfNode() throws SAXParseException {
super.endOfNode();
getFOEventHandler().endLink();
}
/**
* @see org.apache.fop.fo.FObj#addLayoutManager(List)
*/
public void addLayoutManager(List list) {
BasicLinkLayoutManager lm = new BasicLinkLayoutManager(this);
list.add(lm);
}
/**
* @return link represented by this fo:basic-link
*/
public String getLink() {
return link;
}
/**
* @return true if link is external, false if internal
*/
public boolean isExternalLink() {
return isExternalLink;
}
/**
* @see org.apache.fop.fo.FObj#getName()
*/
public String getName() {
return "fo:basic-link";
}
/**
* @see org.apache.fop.fo.FObj#getNameId()
*/
public int getNameId() {
return FO_BASIC_LINK;
}
}
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