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1 package org.apache.slide.projector.processor.xml;
2
3 import java.util.ArrayList  ;
4 import java.util.Iterator ;
5 import java.util.List ;
6
7 import org.apache.slide.projector.ConfigurableProcessor;
8 import org.apache.slide.projector.ConfigurationException;
9 import org.apache.slide.projector.ContentType;
10 import org.apache.slide.projector.Context;
11 import org.apache.slide.projector.ProcessException;
12 import org.apache.slide.projector.descriptor.ParameterDescriptor;
13 import org.apache.slide.projector.descriptor.ResultEntryDescriptor;
14 import org.apache.slide.projector.descriptor.StringValueDescriptor;
15 import org.apache.slide.projector.i18n.DefaultMessage;
16 import org.apache.slide.projector.i18n.ErrorMessage;
17 import org.apache.slide.projector.i18n.ParameterMessage;
18 import org.apache.slide.projector.processor.SimpleProcessor;
19 import org.apache.slide.projector.value.ArrayValue;
20 import org.apache.slide.projector.value.ElementValue;
21 import org.apache.slide.projector.value.StreamableValue;
22 import org.apache.slide.projector.value.StringValue;
23 import org.apache.slide.projector.value.Value;
24 import org.apache.slide.projector.value.XMLValue;
25 import org.jdom.Attribute;
26 import org.jdom.CDATA;
27 import org.jdom.Comment;
28 import org.jdom.Element;
29 import org.jdom.ProcessingInstruction;
30 import org.jdom.Text;
31 import org.jdom.xpath.XPath;
32
33
36
37 public class XPathQuery extends SimpleProcessor implements ConfigurableProcessor {
38 private Element rootElement;
39
40 public Value process(Value input, Context context) throws Exception {
41 XPath xPath = XPath.newInstance(((StringValue)input).toString());
42 List nodeList = xPath.selectNodes(rootElement);
43 return createValueFromNodeList(nodeList);
44 }
45
46 public ParameterDescriptor getParameterDescriptor() {
47 return new ParameterDescriptor(INPUT, new ParameterMessage("xPathQuery/parameter/input"), new StringValueDescriptor());
48 }
49
50 public ResultEntryDescriptor getResultEntryDescriptor() {
51 return new ResultEntryDescriptor(OUTPUT, new DefaultMessage("xPathQuery/result/output"), ContentType.DYNAMIC, true);
52 }
53
54 public void configure(StreamableValue config) throws ConfigurationException {
55 if ( config instanceof XMLValue ) {
56 rootElement = ((XMLValue)config).getRootElement();
57 } else {
58 throw new ConfigurationException(new ErrorMessage("xpathQuery/xmlResourceRequired"));
59 }
60 }
61
62 public static Value createValueFromNodeList(List nodeList) throws ProcessException {
63 if ( nodeList.size() > 1 ) {
64 List resources = new ArrayList ();
65 for ( Iterator i = nodeList.iterator(); i.hasNext(); ) {
66 resources.add(createValueFromNode(i.next()));
67 }
68 Value[] array = new Value[resources.size()];
69 return new ArrayValue((Value [])resources.toArray(array));
70 } else {
71 return createValueFromNode(nodeList.get(0));
72 }
73 }
74
75 public static Value createValueFromNode(Object node) throws ProcessException {
76 if ( node instanceof Element ) {
77 return new ElementValue((Element)node);
78 } else if ( node instanceof Attribute ) {
79 return new StringValue(((Attribute)node).getValue());
80 } else if ( node instanceof Text ) {
81 return new StringValue(((Text)node).getText());
82 } else if ( node instanceof Comment ) {
83 return new StringValue(((Comment)node).getText());
84 } else if ( node instanceof CDATA ) {
85 return new StringValue(((CDATA)node).toString());
86 } else if ( node instanceof ProcessingInstruction ) {
87 return new StringValue(((ProcessingInstruction)node).getData());
88 }
89 throw new ProcessException(new ErrorMessage("unconvertableJDomNode"));
90 }
91 } |
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