/*
* 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.apache.tuscany.sca.common.xml.stax.reader;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.Location;
import javax.xml.stream.XMLStreamException;
public class NameValuePairStreamReader implements XMLFragmentStreamReader {
private static final int START_ELEMENT_STATE = 0;
private static final int TEXT_STATE = 1;
private static final int END_ELEMENT_STATE = 2;
private DelegatingNamespaceContext namespaceContext = new DelegatingNamespaceContext();
private QName name;
private String value;
private int state = START_ELEMENT_STATE;
// initiate at the start element state
// keeps track whether the namespace is declared
// false by default
private boolean nsDeclared;
public NameValuePairStreamReader(QName name, String value) {
this.name = name;
this.value = value;
}
public Object getProperty(String key) throws IllegalArgumentException {
return null;
}
public int next() throws XMLStreamException {
// no need to handle null here. it should have been handled
// already
switch (state) {
case START_ELEMENT_STATE:
state = TEXT_STATE;
return CHARACTERS;
case END_ELEMENT_STATE:
// oops, not supposed to happen!
throw new XMLStreamException("end already reached!");
case TEXT_STATE:
state = END_ELEMENT_STATE;
return END_ELEMENT;
default:
throw new XMLStreamException("unknown event type!");
}
}
public void require(int i, String string, String string1) throws XMLStreamException {
// not implemented
}
public String getElementText() throws XMLStreamException {
if (state == START_ELEMENT) {
// move to the end state and return the value
state = END_ELEMENT_STATE;
return value;
} else {
throw new XMLStreamException();
}
}
public int nextTag() throws XMLStreamException {
return 0; // TODO
}
public boolean hasNext() throws XMLStreamException {
return state != END_ELEMENT_STATE;
}
public void close() throws XMLStreamException {
// Do nothing - we've nothing to free here
}
public String getNamespaceURI(String prefix) {
return namespaceContext.getNamespaceURI(prefix);
}
public boolean isStartElement() {
return state == START_ELEMENT_STATE;
}
public boolean isEndElement() {
return state == END_ELEMENT_STATE;
}
public boolean isCharacters() {
return state == TEXT_STATE;
}
public boolean isWhiteSpace() {
return false; // no whitespaces here
}
public String getAttributeValue(String string, String string1) {
return null;
}
public int getAttributeCount() {
return 0;
}
public QName getAttributeName(int i) {
return null;
}
public String getAttributeNamespace(int i) {
return null;
}
public String getAttributeLocalName(int i) {
return null;
}
public String getAttributePrefix(int i) {
return null;
}
public String getAttributeType(int i) {
return null;
}
public String getAttributeValue(int i) {
return null;
}
public boolean isAttributeSpecified(int i) {
return false; // no attributes here
}
public int getNamespaceCount() {
return nsDeclared ? 1 : 0;
}
public String getNamespacePrefix(int i) {
return (nsDeclared && i == 0) ? name.getPrefix() : null;
}
public String getNamespaceURI(int i) {
return (nsDeclared && i == 0) ? name.getNamespaceURI() : null;
}
public NamespaceContext getNamespaceContext() {
return this.namespaceContext;
}
public int getEventType() {
switch (state) {
case START_ELEMENT_STATE:
return START_ELEMENT;
case END_ELEMENT_STATE:
return END_ELEMENT;
case TEXT_STATE:
return CHARACTERS;
default:
throw new UnsupportedOperationException();
// we've no idea what this is!!!!!
}
}
public String getText() {
if (state == TEXT_STATE) {
return value;
} else {
throw new IllegalStateException();
}
}
public char[] getTextCharacters() {
if (state == TEXT_STATE) {
return value.toCharArray();
} else {
throw new IllegalStateException();
}
}
public int getTextCharacters(int i, char[] chars, int i1, int i2) throws XMLStreamException {
// not implemented
throw new UnsupportedOperationException();
}
public int getTextStart() {
if (state == TEXT_STATE) {
return 0;
} else {
throw new IllegalStateException();
}
}
public int getTextLength() {
if (state == TEXT_STATE) {
return value.length();
} else {
throw new IllegalStateException();
}
}
public String getEncoding() {
return null;
}
public boolean hasText() {
return state == TEXT_STATE;
}
public Location getLocation() {
return new Location() {
public int getLineNumber() {
return 0;
}
public int getColumnNumber() {
return 0;
}
public int getCharacterOffset() {
return 0;
}
public String getPublicId() {
return null;
}
public String getSystemId() {
return null;
}
};
}
public QName getName() {
if (state != TEXT_STATE) {
return name;
} else {
return null;
}
}
public String getLocalName() {
if (state != TEXT_STATE) {
return name.getLocalPart();
} else {
return null;
}
}
public boolean hasName() {
return state != TEXT_STATE;
}
public String getNamespaceURI() {
if (state != TEXT_STATE) {
return name.getNamespaceURI();
} else {
return null;
}
}
public String getPrefix() {
if (state != TEXT_STATE) {
return name.getPrefix();
} else {
return null;
}
}
public String getVersion() {
return null; // TODO 1.0 ?
}
public boolean isStandalone() {
return false;
}
public boolean standaloneSet() {
return false;
}
public String getCharacterEncodingScheme() {
return null;
}
public String getPITarget() {
return null;
}
public String getPIData() {
return null;
}
public boolean isDone() {
return state == END_ELEMENT_STATE;
}
public void setParentNamespaceContext(NamespaceContext nsContext) {
this.namespaceContext.setParentNsContext(nsContext);
}
public void init() {
// just add the current elements namespace and prefix to the this
// elements nscontext
addToNsMap(name.getPrefix(), name.getNamespaceURI());
}
/**
* @param prefix
* @param uri
*/
private void addToNsMap(String prefix, String uri) {
// TODO - need to fix this up to cater for cases where
// namespaces are having no prefixes
if (!uri.equals(namespaceContext.getNamespaceURI(prefix))) {
// this namespace is not there. Need to declare it
namespaceContext.pushNamespace(prefix, uri);
nsDeclared = true;
}
}
}