SAXEmitter.java

/*******************************************************************************
 * Copyright (c) 2004, 2005
 * Thomas Hallgren, Kenneth Olwing, Mitch Sonies
 * Pontus Rydin, Nils Unden, Peer Torngren
 * The code, documentation and other materials contained herein have been
 * licensed under the Eclipse Public License - v 1.0 by the individual
 * copyright holders listed above, as Initial Contributors under such license.
 * The text of such license is available at www.eclipse.org.
 *******************************************************************************/
package org.eclipse.buckminster.core.common.model;

import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

import org.eclipse.buckminster.core.helpers.MapUnion;
import org.eclipse.buckminster.sax.Utils;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;

/**
 * @author Thomas Hallgren
 */
public abstract class SAXEmitter {
	public static void emitProperties(ContentHandler handler, Map<String, String> props, String namespace, String prefix, boolean raw,
			boolean includeDefaults) throws SAXException {
		if (raw && props instanceof ExpandingProperties<?>) {
			((ExpandingProperties<?>) props).emitProperties(handler, namespace, prefix, includeDefaults);
			return;
		}

		TreeSet<String> sorted = new TreeSet<String>();
		if (includeDefaults) {
			for (String name : props.keySet()) {
				// We don't include the system properties here. Perhaps we
				// should? But
				// then again, in order to have everything, we'd need the
				// environment,
				// and the OS configuration info as well (at least).
				//
				String sysValue = System.getProperty(name);
				if (sysValue != null && sysValue.equals(props.get(name)))
					continue;

				sorted.add(name);
			}
		} else {
			Set<String> keySet;
			if (props instanceof IProperties<?>)
				keySet = ((IProperties<?>) props).overlayKeySet();
			else if (props instanceof MapUnion<?, ?>)
				keySet = ((MapUnion<String, String>) props).overlayKeySet();
			else
				keySet = props.keySet();
			for (String name : keySet)
				sorted.add(name);
		}

		String plName = "property"; //$NON-NLS-1$
		String pqName = Utils.makeQualifiedName(prefix, plName);

		AttributesImpl attrs = new AttributesImpl();
		boolean withMutableAttr = (props instanceof IProperties<?>) && ((IProperties<?>) props).supportsMutability();
		for (String name : sorted) {
			String value = props.get(name);
			if (value == null || value.length() == 0)
				continue;

			attrs.clear();
			Utils.addAttribute(attrs, "key", name); //$NON-NLS-1$
			Utils.addAttribute(attrs, "value", value); //$NON-NLS-1$
			if (withMutableAttr && ((IProperties<?>) props).isMutable(name))
				Utils.addAttribute(attrs, "mutable", "true"); //$NON-NLS-1$ //$NON-NLS-2$
			handler.startElement(namespace, plName, pqName, attrs);
			handler.endElement(namespace, plName, pqName);
		}
	}
}