AttributesHandler.java

/*****************************************************************************
 * Copyright (c) 2006-2013, Cloudsmith Inc.
 * The code, documentation and other materials contained herein have been
 * licensed under the Eclipse Public License - v 1.0 by the copyright holder
 * listed above, as the Initial Contributor under such license. The text of
 * such license is available at www.eclipse.org.
 *****************************************************************************/
package org.eclipse.buckminster.core.cspec.parser;

import org.eclipse.buckminster.core.cspec.builder.AttributeBuilder;
import org.eclipse.buckminster.core.cspec.builder.CSpecBuilder;
import org.eclipse.buckminster.core.cspec.model.AttributeAlreadyDefinedException;
import org.eclipse.buckminster.core.cspec.model.TopLevelAttribute;
import org.eclipse.buckminster.core.parser.ExtensionAwareHandler;
import org.eclipse.buckminster.sax.AbstractHandler;
import org.eclipse.buckminster.sax.ChildHandler;
import org.eclipse.buckminster.sax.ChildPoppedListener;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

/**
 * @author Thomas Hallgren
 */
abstract class AttributesHandler extends ExtensionAwareHandler implements ChildPoppedListener, ICSpecBuilderSupport {
	private TopLevelAttributeHandler publicHandler;

	private TopLevelAttributeHandler privateHandler;

	AttributesHandler(AbstractHandler parent) {
		super(parent);
	}

	@Override
	public void childPopped(ChildHandler child) throws SAXException {
		this.addAttribute(((AttributeHandler) child).getAttributeBuilder());
	}

	@Override
	public ChildHandler createHandler(String uri, String localName, Attributes attrs) throws SAXException {
		ChildHandler ch;
		if (TopLevelAttribute.PUBLIC_TAG.equals(localName)) {
			if (publicHandler == null)
				publicHandler = createAttributeHandler(true);
			ch = publicHandler;
		} else if (TopLevelAttribute.PRIVATE_TAG.equals(localName)) {
			if (privateHandler == null)
				privateHandler = createAttributeHandler(false);
			ch = privateHandler;
		} else
			ch = super.createHandler(uri, localName, attrs);
		return ch;
	}

	@Override
	public CSpecBuilder getCSpecBuilder() {
		return ((ICSpecBuilderSupport) this.getParentHandler()).getCSpecBuilder();
	}

	final void addAttribute(AttributeBuilder attribute) throws SAXException {
		try {
			this.getCSpecBuilder().addAttribute(attribute);
		} catch (AttributeAlreadyDefinedException e) {
			throw new SAXParseException(e.getMessage(), this.getDocumentLocator());
		}
	}

	abstract TopLevelAttributeHandler createAttributeHandler(boolean publ);
}