/*
* Copyright 2011, 2012 Odysseus Software GmbH
*
* 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.synapse.commons.staxon.core.json.stream.util;
import java.io.IOException;
import javax.xml.XMLConstants;
import javax.xml.namespace.QName;
import org.apache.synapse.commons.staxon.core.json.stream.JsonStreamSource;
import org.apache.synapse.commons.staxon.core.json.stream.JsonStreamToken;
public class AddRootSource extends StreamSourceDelegate {
private enum State {
START_DOC,
ROOT_NAME,
ROOT_XMLNS_NAME,
ROOT_XMLNS_VALUE,
DELEGATE,
END_DOC
}
private final QName root;
private final char namespaceSeparator;
private State state = State.START_DOC;
private int depth = 0;
public AddRootSource(JsonStreamSource delegate, QName root, char namespaceSeparator) {
super(delegate);
this.root = root;
this.namespaceSeparator = namespaceSeparator;
}
@Override
public String name() throws IOException {
if (state == State.ROOT_NAME) {
state = State.DELEGATE;
if (XMLConstants.DEFAULT_NS_PREFIX.equals(root.getPrefix())) {
return root.getLocalPart();
} else {
return root.getPrefix() + namespaceSeparator + root.getLocalPart();
}
} else if (state == State.ROOT_XMLNS_NAME) {
state = State.ROOT_XMLNS_VALUE;
if (XMLConstants.DEFAULT_NS_PREFIX.equals(root.getPrefix())) {
return '@' + XMLConstants.XMLNS_ATTRIBUTE;
} else {
return '@' + XMLConstants.XMLNS_ATTRIBUTE + namespaceSeparator + root.getLocalPart();
}
}
return super.name();
}
@Override
public Value value() throws IOException {
if (state == State.ROOT_XMLNS_VALUE) {
state = State.DELEGATE;
return new Value(root.getNamespaceURI());
}
return super.value();
}
@Override
public void startObject() throws IOException {
if (state == State.START_DOC) {
state = State.ROOT_NAME;
} else {
if (depth == 1 && !XMLConstants.NULL_NS_URI.equals(root.getNamespaceURI())) {
state = State.ROOT_XMLNS_NAME;
}
super.startObject();
}
depth++;
}
@Override
public void endObject() throws IOException {
if (state == State.END_DOC) {
state = null;
return;
}
if (depth == 1 && state == State.DELEGATE && super.peek() == JsonStreamToken.NONE) {
state = State.END_DOC;
}
if (state != State.END_DOC) {
super.endObject();
}
depth--;
}
@Override
public JsonStreamToken peek() throws IOException {
if (state == null) {
return JsonStreamToken.NONE;
}
switch (state) {
case START_DOC:
return JsonStreamToken.START_OBJECT;
case ROOT_NAME:
return JsonStreamToken.NAME;
case ROOT_XMLNS_NAME:
return JsonStreamToken.NAME;
case ROOT_XMLNS_VALUE:
return JsonStreamToken.VALUE;
case END_DOC:
return JsonStreamToken.END_OBJECT;
case DELEGATE:
JsonStreamToken result = super.peek();
if (depth == 1 && result == JsonStreamToken.NONE) {
result = JsonStreamToken.END_OBJECT;
}
return result;
default:
throw new IllegalStateException("Unexpected state: " + state);
}
}
}