/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.waveprotocol.wave.model.document.parser;
import org.waveprotocol.wave.model.util.Preconditions;
import org.waveprotocol.wave.model.util.StringMap;
import java.util.LinkedList;
import java.util.NoSuchElementException;
import java.util.Queue;
/**
* XmlPullParser implementation that parses and validates input eagerly.
*
*/
public class BufferedXmlParser implements SafeXmlPullParser {
private final StreamingXmlParser parserImpl;
/** Parsed tokens. */
private final Queue<Item> tokens = new LinkedList<Item>();
/** The current token. */
private Item current;
public BufferedXmlParser(String input) throws XmlParseException {
parserImpl = new StreamingXmlParser(input);
parse();
}
@Override
public StringMap<String> getAttributes() throws IllegalStateException {
return current.getAttributes();
}
@Override
public ItemType getCurrentType() throws IllegalStateException {
return current != null ? current.type : null;
}
@Override
public String getTagName() throws IllegalStateException {
return current.getTagName();
}
@Override
public String getText() throws IllegalStateException {
return current.getText();
}
@Override
public String getProcessingInstructionName() throws IllegalStateException {
return current.getProcessingInstructionName();
}
@Override
public String getProcessingInstructionValue() throws IllegalStateException {
return current.getProcessingInstructionValue();
}
@Override
public ItemType next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
current = tokens.poll();
return getCurrentType();
}
@Override
public boolean hasNext() {
return !tokens.isEmpty();
}
void parse() throws XmlParseException {
try {
while (parserImpl.hasNext()) {
parserImpl.next();
tokens.add(parserImpl.getCurrentItem());
}
} catch (RuntimeXmlParseException e) {
throw new XmlParseException(e);
}
}
@Override
public void remove() {
Preconditions.illegalState("Not implemented");
}
}