Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/Builder.java @ 5449:504a62887217
Datacage: Compile XPath expressions and reuse them. With the introduction of filters in dc:elements XPath expressions are evalutated very often so compiling them should reduce the overhead significantly.
| author | Sascha L. Teichmann <teichmann@intevation.de> |
|---|---|
| date | Wed, 27 Mar 2013 10:59:55 +0100 |
| parents | 3d7e552cc396 |
| children | 3b5e1535a459 |
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| 5448:b279f2d4bc78 | 5449:504a62887217 |
|---|---|
| 19 | 19 |
| 20 import javax.xml.namespace.QName; | 20 import javax.xml.namespace.QName; |
| 21 | 21 |
| 22 import javax.xml.xpath.XPath; | 22 import javax.xml.xpath.XPath; |
| 23 import javax.xml.xpath.XPathConstants; | 23 import javax.xml.xpath.XPathConstants; |
| 24 import javax.xml.xpath.XPathExpression; | |
| 24 import javax.xml.xpath.XPathExpressionException; | 25 import javax.xml.xpath.XPathExpressionException; |
| 25 import javax.xml.xpath.XPathFactory; | 26 import javax.xml.xpath.XPathFactory; |
| 26 | 27 |
| 27 import org.apache.log4j.Logger; | 28 import org.apache.log4j.Logger; |
| 28 | 29 |
| 95 protected List<NamedConnection> connections; | 96 protected List<NamedConnection> connections; |
| 96 protected Map<String, CompiledStatement.Instance> statements; | 97 protected Map<String, CompiledStatement.Instance> statements; |
| 97 protected Deque<Pair<NamedConnection, ResultData>> connectionsStack; | 98 protected Deque<Pair<NamedConnection, ResultData>> connectionsStack; |
| 98 protected Deque<NodeList> macroBodies; | 99 protected Deque<NodeList> macroBodies; |
| 99 protected FunctionResolver functionResolver; | 100 protected FunctionResolver functionResolver; |
| 101 protected Map<String, XPathExpression> expressions; | |
| 102 | |
| 100 | 103 |
| 101 public BuildHelper( | 104 public BuildHelper( |
| 102 Node output, | 105 Node output, |
| 103 List<NamedConnection> connections, | 106 List<NamedConnection> connections, |
| 104 Map<String, Object> parameters | 107 Map<String, Object> parameters |
| 113 this.output = output; | 116 this.output = output; |
| 114 frames = new StackFrames(parameters); | 117 frames = new StackFrames(parameters); |
| 115 owner = getOwnerDocument(output); | 118 owner = getOwnerDocument(output); |
| 116 macroBodies = new ArrayDeque<NodeList>(); | 119 macroBodies = new ArrayDeque<NodeList>(); |
| 117 functionResolver = new FunctionResolver(this); | 120 functionResolver = new FunctionResolver(this); |
| 121 expressions = new HashMap<String, XPathExpression>(); | |
| 118 statements = | 122 statements = |
| 119 new HashMap<String, CompiledStatement.Instance>(); | 123 new HashMap<String, CompiledStatement.Instance>(); |
| 120 } | 124 } |
| 121 | 125 |
| 122 public void build() throws SQLException { | 126 public void build() throws SQLException { |
| 529 build(parent, subs.item(i)); | 533 build(parent, subs.item(i)); |
| 530 } | 534 } |
| 531 } | 535 } |
| 532 } | 536 } |
| 533 | 537 |
| 534 protected Object evaluateXPath(String expr, QName returnType) { | 538 protected XPathExpression getXPathExpression(String expr) |
| 535 | 539 throws XPathExpressionException |
| 536 if (log.isDebugEnabled()) { | 540 { |
| 537 log.debug("evaluate: '" + expr + "'"); | 541 XPathExpression x = expressions.get(expr); |
| 538 } | 542 if (x == null) { |
| 539 | |
| 540 try { | |
| 541 XPath xpath = XPATH_FACTORY.newXPath(); | 543 XPath xpath = XPATH_FACTORY.newXPath(); |
| 542 xpath.setXPathVariableResolver(frames); | 544 xpath.setXPathVariableResolver(frames); |
| 543 xpath.setXPathFunctionResolver(functionResolver); | 545 xpath.setXPathFunctionResolver(functionResolver); |
| 544 return xpath.evaluate(expr, EVAL_DOCUMENT, returnType); | 546 x = xpath.compile(expr); |
| 547 expressions.put(expr, x); | |
| 548 } | |
| 549 return x; | |
| 550 } | |
| 551 | |
| 552 protected Object evaluateXPath(String expr, QName returnType) { | |
| 553 | |
| 554 if (log.isDebugEnabled()) { | |
| 555 log.debug("evaluate: '" + expr + "'"); | |
| 556 } | |
| 557 | |
| 558 try { | |
| 559 XPathExpression x = getXPathExpression(expr); | |
| 560 return x.evaluate(EVAL_DOCUMENT, returnType); | |
| 545 } | 561 } |
| 546 catch (XPathExpressionException xpee) { | 562 catch (XPathExpressionException xpee) { |
| 547 log.error("expression: " + expr, xpee); | 563 log.error("expression: " + expr, xpee); |
| 548 } | 564 } |
| 549 return null; | 565 return null; |