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/*
 * Copyright 1999,2005 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.
 */
package org.apache.xmlrpc.parser;

import javax.xml.namespace.QName;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;


/** Abstract base implementation of {@link org.apache.xmlrpc.parser.TypeParser}
 * for parsing an atomic value.
 */
public abstract class AtomicParser extends TypeParserImpl {
	private int level;
	protected StringBuffer sb;

	/** Creates a new instance.
	 */
	protected AtomicParser() {
	}

	protected abstract void setResult(String pResult) throws SAXException;

	public void startDocument() throws SAXException {
		level = 0;
	}

	public void characters(char[] pChars, int pStart, int pLength) throws SAXException {
		if (sb == null) {
			if (!isEmpty(pChars, pStart, pLength)) {
				throw new SAXParseException("Unexpected non-whitespace characters",
											getDocumentLocator());
			}
		} else {
			sb.append(pChars, pStart, pLength);
		}
	}

	public void endElement(String pURI, String pLocalName, String pQName) throws SAXException {
		if (--level == 0) {
			setResult(sb.toString());
		} else {
			throw new SAXParseException("Unexpected end tag in atomic element: "
										+ new QName(pURI, pLocalName),
										getDocumentLocator());
		}
	}

	public void startElement(String pURI, String pLocalName, String pQName, Attributes pAttrs) throws SAXException {
		if (level++ == 0) {
			sb = new StringBuffer();
		} else {
			throw new SAXParseException("Unexpected start tag in atomic element: "
										+ new QName(pURI, pLocalName),
										getDocumentLocator());
		}
	}
}