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/*
* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
package org.apache.fop.mif;
// Java
import java.io.*;
import java.util.*;
/**
* The is the basis for MIF document elements.
* This enables the creation of the element and to write it
* to an output stream including sub-elements or a single value.
*/
public class MIFElement {
protected String name;
protected String valueStr = null;
protected ArrayList valueElements = null;
protected boolean started = false;
protected boolean finish = false;
protected boolean finished = false;
/**
*/
public MIFElement(String n) {
name = n;
}
public void setValue(String str) {
valueStr = str;
}
public void addElement(MIFElement el) {
if(valueElements == null) {
valueElements = new ArrayList();
}
valueElements.add(el);
}
/**
* Output this element to an output stream.
* This will output only so far as the fisrt unfinished child element.
* This method can be called again to continue from the previous point.
* An element that contains child elements will only be finished when
* the finish method is called.
*/
public boolean output(OutputStream os, int indent) throws IOException {
if(finished) return true;
if(valueElements == null && valueStr == null) return false;
String indentStr = "";
for(int c = 0; c < indent; c++) indentStr += " ";
if(!started) {
os.write((indentStr + "<" + name).getBytes());
if(valueElements != null)
os.write(("\n").getBytes());
started = true;
}
if(valueElements != null) {
boolean done = true;
for(Iterator iter = valueElements.iterator(); iter.hasNext(); ) {
MIFElement el = (MIFElement)iter.next();
boolean d = el.output(os, indent + 1);
if(d) {
iter.remove();
} else {
done = false;
break;
}
}
if(!finish || !done) {
return false;
}
os.write((indentStr + "> # end of " + name + "\n").getBytes());
} else {
os.write((" " + valueStr + ">\n").getBytes());
}
finished = true;
return true;
}
public void finish(boolean deep) {
finish = true;
if(deep && valueElements != null) {
for(Iterator iter = valueElements.iterator(); iter.hasNext(); ) {
MIFElement el = (MIFElement)iter.next();
el.finish(deep);
}
}
}
}
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