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Axis2 Data Binding module
/*
* 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.axis2.databinding.utils;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.util.ArrayList;
import java.util.List;
/** A state machine that reads arrays with simple content. returns a string array */
public class SimpleArrayReaderStateMachine implements States, Constants {
private QName elementNameToTest = null;
private int currentState = INIT_STATE;
private boolean nillable = false;
private boolean canbeAbsent = false;
private List list = new ArrayList();
/** @return an array of strings */
public String[] getTextArray() {
return (String[])list.toArray(new String[list.size()]);
}
public void setNillable() {
nillable = true;
}
public boolean isCanbeAbsent() {
return canbeAbsent;
}
public void setCanbeAbsent(boolean canbeAbsent) {
this.canbeAbsent = canbeAbsent;
}
/**
* Resets the state machine. Once the reset is called the state machine is good enough for a
* fresh run
*/
public void reset() {
elementNameToTest = null;
currentState = INIT_STATE;
nillable = false;
list = new ArrayList();
}
public void setElementNameToTest(QName elementNameToTest) {
this.elementNameToTest = elementNameToTest;
}
/**
* public read method - reads a given reader to extract the text value
*
* @param reader
*/
public void read(XMLStreamReader reader) throws XMLStreamException {
do {
updateState(reader);
//test for the nillable attribute
if (currentState == START_ELEMENT_FOUND_STATE &&
nillable) {
if (TRUE.equals(reader.getAttributeValue(XSI_NAMESPACE, NIL))) {
list.add(null);
//force the state to be null found
currentState = NULLED_STATE;
}
}
if (currentState == TEXT_FOUND_STATE) {
//read the text value and store it in the list
list.add(reader.getText());
}
//increment the parser only if the state is
//not finished
if (currentState != FINISHED_STATE
&& currentState != ILLEGAL_STATE) {
reader.next();
}
} while (currentState != FINISHED_STATE
&& currentState != ILLEGAL_STATE);
if (currentState == ILLEGAL_STATE) {
throw new RuntimeException("Illegal state!");
}
}
private void updateState(XMLStreamReader reader) throws XMLStreamException {
int event = reader.getEventType();
switch (currentState) {
case INIT_STATE:
if (event == XMLStreamConstants.START_DOCUMENT) {
currentState = STARTED_STATE;
} else if (event == XMLStreamConstants.START_ELEMENT) {
if (elementNameToTest.equals(reader.getName())) {
currentState = START_ELEMENT_FOUND_STATE;
} else {
//we found a start element that does not have
//the name of the element
currentState = canbeAbsent ?
FINISHED_STATE :
STARTED_STATE;
}
} else if (event == XMLStreamConstants.END_ELEMENT) {
// an end element is found at the init state
// we should break the process here ?
if (!elementNameToTest.equals(reader.getName())) {
currentState = FINISHED_STATE;
}
}
break;
case STARTED_STATE:
if (event == XMLStreamConstants.END_ELEMENT) {
if (elementNameToTest.equals(reader.getName())) {
currentState = ILLEGAL_STATE;
} else {
currentState = FINISHED_STATE;
}
} else if (event == XMLStreamConstants.START_ELEMENT) {
QName name = reader.getName();
if (elementNameToTest.equals(name)) {
currentState = START_ELEMENT_FOUND_STATE;
}
}
break;
case START_ELEMENT_FOUND_STATE:
if (event == XMLStreamConstants.CHARACTERS) {
currentState = TEXT_FOUND_STATE;
}
break;
case TEXT_FOUND_STATE:
if (event == XMLStreamConstants.END_ELEMENT) {
if (elementNameToTest.equals(reader.getName())) {
currentState = END_ELEMENT_FOUND_STATE;
} else {
currentState = ILLEGAL_STATE;
}
} else if (event == XMLStreamConstants.CHARACTERS) {
//another char event -
//so append it to the current text
}
break;
case NULLED_STATE:
//read upto the end and set the state to END_ELEMENT_FOUND_STATE
while (event != XMLStreamConstants.END_ELEMENT) {
event = reader.next();
}
currentState = END_ELEMENT_FOUND_STATE;
break;
case END_ELEMENT_FOUND_STATE:
if (event == XMLStreamConstants.START_ELEMENT) {
//restart the parsing
if (elementNameToTest.equals(reader.getName())) {
currentState = START_ELEMENT_FOUND_STATE;
} else {
currentState = FINISHED_STATE;
}
//another end element found after end-element
} else if (event == XMLStreamConstants.END_ELEMENT) {
currentState = FINISHED_STATE;
//end document found
}
break;
default:
//characters found - if this is a characters event that was in the correct place then
//it would have been handled already. we need to check whether this is a ignorable
//whitespace and if not push the state machine to a illegal state.
if (event == XMLStreamConstants.CHARACTERS) {
if (reader.getText().trim().length() == 0) {
//the text is empty - don't change the state
} else {
//we do NOT handle mixed content
currentState = ILLEGAL_STATE;
}
} else {
currentState = ILLEGAL_STATE;
}
}
}
}