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Apache OODT Common Utilities Project
// Licensed to the Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE.txt 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.oodt.commons.util;
import java.io.*;
import java.util.*;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import org.w3c.dom.*;
import org.xml.sax.*;
/** XML-RPC utilities.
*
* This class provides several XML-RPC utilities.
*
* @author Kelly
*/
public class XMLRPC {
/** Build an XML-RPC method call.
*
* This may throw {@link IllegalArgumentException} if the params
* contains an object that's incompatible with XML-RPC.
*
* @param name Name of the method to call.
* @param params Parameters to pass to the call.
* @return An XML string encapsulationg the call.
* @throws DOMException If we can't construct the call.
*/
public static byte[] createMethodCall(String name, Collection params) throws DOMException {
Document doc = XML.createDocument();
Element methodCallElement = doc.createElement("methodCall");
doc.appendChild(methodCallElement);
XML.add(methodCallElement, "methodName", name);
if (params != null && !params.isEmpty()) {
Element paramsElement = doc.createElement("params");
methodCallElement.appendChild(paramsElement);
for (Iterator i = params.iterator(); i.hasNext();)
paramsElement.appendChild(createValueElement(doc, i.next()));
}
return XML.serialize(doc).getBytes();
}
/** Create a <value> element for an XML-RPC method.
*
* This may throw {@link IllegalArgumentException} if the value is
* incompatible with XML-RPC.
*
* @param doc Owning document.
* @param value The value.
* @throws DOMException If we can't construct the <value>.
*/
private static Element createValueElement(Document doc, Object value) throws DOMException {
if (value == null)
throw new IllegalArgumentException("Nulls not supported in XML-RPC");
Element valueElement = doc.createElement("value");
if (value instanceof Integer || value instanceof Short) {
XML.add(valueElement, "int", value.toString());
} else if (value instanceof Boolean) {
XML.add(valueElement, "boolean", ((Boolean) value).booleanValue()? "1" : "0");
} else if (value instanceof String) {
Element stringElement = doc.createElement("string");
valueElement.appendChild(stringElement);
stringElement.appendChild(doc.createCDATASection(value.toString()));
} else if (value instanceof Float || value instanceof Double) {
XML.add(valueElement, "double", value.toString());
} else if (value instanceof Date) {
XML.add(valueElement, "dateTime.iso8601", ISO8601_FORMAT.format((Date) value));
} else if (value instanceof byte[]) {
Element base64Element = doc.createElement("base64");
valueElement.appendChild(base64Element);
base64Element.appendChild(doc.createCDATASection(new String(Base64.encode((byte[])value))));
} else if (value instanceof Map) {
Element structElement = doc.createElement("struct");
valueElement.appendChild(structElement);
Map map = (Map) value;
for (Iterator i = map.entrySet().iterator(); i.hasNext();) {
Element memberElement = doc.createElement("member");
valueElement.appendChild(memberElement);
Map.Entry entry = (Map.Entry) i.next();
if (!(entry.getKey() instanceof String))
throw new IllegalArgumentException("Keys in maps for XML-RPC structs must be Strings");
XML.add(memberElement, "name", entry.getKey().toString());
memberElement.appendChild(createValueElement(doc, entry.getValue()));
}
} else if (value instanceof Collection) {
Element arrayElement = doc.createElement("array");
valueElement.appendChild(arrayElement);
Element dataElement = doc.createElement("data");
arrayElement.appendChild(dataElement);
Collection collection = (Collection) value;
for (Iterator i = collection.iterator(); i.hasNext();)
dataElement.appendChild(createValueElement(doc, i.next()));
} else throw new IllegalArgumentException(value.getClass().getName() + " not supported in XML-RPC");
return valueElement;
}
/** Parse an XML-RPC method response.
*
* @param response The response data.
* @return The value contained in the response.
* @throws XMLRPCFault If the response contained a fault.
*/
public static Object parseResponse(byte[] response) throws XMLRPCFault {
try {
DOMParser parser = XML.createDOMParser();
parser.setFeature("http://xml.org/sax/features/validation", false);
parser.parse(new InputSource(new ByteArrayInputStream(response)));
Document doc = parser.getDocument();
doc.normalize();
XML.removeComments(doc);
Element methodResponseElement = doc.getDocumentElement();
if (!"methodResponse".equals(methodResponseElement.getNodeName()))
throw new SAXException("Not a document");
Node child = methodResponseElement.getFirstChild();
if ("params".equals(child.getNodeName())) {
return parseValue(child.getFirstChild().getFirstChild());
} else if ("fault".equals(child.getNodeName())) {
try {
Map map = (Map) parseValue(child.getFirstChild());
throw new XMLRPCFault(((Integer) map.get("faultCode")).intValue(),
(String) map.get("faultString"));
} catch (ClassCastException ex) {
throw new SAXException("XML-RPC invalid");
}
} else throw new SAXException("XML-RPC response does not contain or ");
} catch (SAXException ex) {
throw new IllegalArgumentException(ex.getMessage());
} catch (IOException ex) {
throw new RuntimeException("Unexpected I/O exception that shouldn't happen, but did: " + ex.getMessage());
}
}
/** Parse an XML-RPC <value>.
*
* @param node The <value> node.
* @return The Java value of node.
*/
private static Object parseValue(Node node) {
String n = node.getNodeName();
if (!"value".equals(n)) throw new IllegalArgumentException("Expecting a , not a <" + n + ">");
Node t = node.getFirstChild();
n = t.getNodeName();
// Default if there's no nested element is a String.
if (t.getNodeType() == Node.TEXT_NODE || t.getNodeType() == Node.CDATA_SECTION_NODE) {
return t.getNodeValue();
}
// Figure out what the type is from the nested element.
String txt = XML.unwrappedText(t);
if ("i4".equals(n) || "int".equals(n)) {
return new Integer(txt);
} else if ("boolean".equals(n)) {
if ("1".equals(txt)) return new Boolean(true);
else if ("0".equals(txt)) return new Boolean(false);
else throw new IllegalArgumentException(n + " does not contain a 0 or 1");
} else if ("string".equals(n)) {
return txt;
} else if ("double".equals(n)) {
return new Double(txt);
} else if ("dateTime.iso8601".equals(n)) {
try {
return ISO8601_FORMAT.parse(txt);
} catch (ParseException ex) {
throw new IllegalArgumentException(n + " does not contain an ISO8601 format date/time");
}
} else if ("base64".equals(n)) {
return Base64.decode(txt.getBytes());
} else if ("struct".equals(n)) {
Map m = new HashMap();
NodeList memberNodes = t.getChildNodes();
for (int i = 0; i < memberNodes.getLength(); ++i) {
Node memberNode = memberNodes.item(i);
if (!"member".equals(memberNode.getNodeName()))
throw new IllegalArgumentException(n + " contains <" + memberNode.getNodeName()
+ ">, not ");
Node nameNode = memberNode.getFirstChild();
if (nameNode == null || !"name".equals(nameNode.getNodeName()))
throw new IllegalArgumentException(" missing element");
Node valueNode = nameNode.getNextSibling();
if (valueNode == null || !"value".equals(valueNode.getNodeName()))
throw new IllegalArgumentException(" missing element");
m.put(XML.unwrappedText(nameNode), parseValue(valueNode));
}
return m;
} else if ("array".equals(n)) {
Node dataNode = t.getFirstChild();
if (dataNode == null || !"data".equals(dataNode.getNodeName()))
throw new IllegalArgumentException(" missing element");
NodeList children = dataNode.getChildNodes();
List x = new ArrayList(children.getLength());
for (int i = 0; i < children.getLength(); ++i)
x.add(parseValue(children.item(i)));
return x;
} else throw new IllegalArgumentException("Illegal type " + n + " in ");
}
/** Constructor that causes a runtime exception since this is a utility class.
*/
private XMLRPC() {
throw new IllegalStateException("Do not construct XMLRPC objects");
}
/** ISO8601 date format for XML-RPC dates. */
private static DateFormat ISO8601_FORMAT = new SimpleDateFormat("yyyyMMdd'T'HH:mm:ss");
}