/*
* Copyright 2010 Mark Slater
*
* 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 argo.staj;
import argo.saj.InvalidSyntaxException;
import argo.saj.SajParser;
import java.io.IOException;
import java.io.Reader;
/**
* Implementation of <code>JsonStreamReader</code> based on a character stream of JSON.
*/
public final class StajParser implements JsonStreamReader {
private final BlockingJsonListener blockingJsonListener;
private Element next;
/**
* Constructs a StajParser reading from the specified Reader.
*
* @param in the reader to convert into JSON elements.
*/
public StajParser(final Reader in) {
blockingJsonListener = new BlockingJsonListener();
new Thread("Argo StajParser") {
@Override
public void run() {
try {
new SajParser().parse(in, blockingJsonListener);
} catch (final InvalidSyntaxException e) {
blockingJsonListener.invalidSyntaxException(e);
} catch (final IOException e) {
blockingJsonListener.ioException(e);
} catch (final RuntimeException e) {
blockingJsonListener.runtimeException(e);
} finally {
blockingJsonListener.close();
}
}
}.start();
}
public JsonStreamElementType next() throws JsonStreamException {
try {
next = blockingJsonListener.getNext();
} catch (final IOException e) {
throw new JsonStreamException(e);
} catch (final InvalidSyntaxException e) {
throw new JsonStreamException(e);
}
return next.getJsonStreamElementType();
}
public boolean hasNext() throws JsonStreamException {
try {
return blockingJsonListener.hasNext();
} catch (final IOException e) {
throw new JsonStreamException(e);
} catch (final InvalidSyntaxException e) {
throw new JsonStreamException(e);
}
}
public void close() {
blockingJsonListener.close();
}
public JsonStreamElementType getElementType() {
if (next == null) {
throw new IllegalStateException("Attempt to get element type of current element before first call to next().");
}
return next.getJsonStreamElementType();
}
public String getText() {
if (next == null) {
throw new IllegalStateException("Attempt to get text of current element before first call to next().");
}
return next.getText();
}
public boolean hasText() {
if (next == null) {
throw new IllegalStateException("Attempt to determine whether current element has text before first call to next().");
}
return next.hasText();
}
}