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package org.apache.camel.builder.saxon; |
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import net.sf.saxon.Configuration; |
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import net.sf.saxon.om.DocumentInfo; |
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import net.sf.saxon.query.DynamicQueryContext; |
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import net.sf.saxon.query.StaticQueryContext; |
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import net.sf.saxon.query.XQueryExpression; |
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import net.sf.saxon.trans.XPathException; |
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import org.apache.camel.Exchange; |
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import org.apache.camel.Expression; |
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import org.apache.camel.Predicate; |
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import org.apache.camel.RuntimeExpressionException; |
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import org.apache.camel.util.ObjectHelper; |
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import org.apache.camel.converter.jaxp.BytesSource; |
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import org.apache.camel.converter.jaxp.XmlConverter; |
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import org.apache.camel.converter.jaxp.StringSource; |
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import org.w3c.dom.Node; |
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import javax.xml.transform.Result; |
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import javax.xml.transform.Source; |
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import javax.xml.transform.dom.DOMResult; |
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import javax.xml.transform.stream.StreamResult; |
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import java.io.ByteArrayOutputStream; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.io.Reader; |
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import java.io.StringWriter; |
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import java.util.HashMap; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.Properties; |
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import java.util.Set; |
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public abstract class XQueryBuilder<E extends Exchange> implements Expression<E>, Predicate<E> { |
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private Configuration configuration; |
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private XQueryExpression expression; |
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private StaticQueryContext staticQueryContext; |
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private Map<String, Object> parameters = new HashMap<String, Object>(); |
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private XmlConverter converter = new XmlConverter(); |
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private ResultFormat resultsFormat = ResultFormat.DOM; |
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private Properties properties = new Properties(); |
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@Override |
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public String toString() { |
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return "XQuery[" + expression + "]"; |
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} |
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public Object evaluate(E exchange) { |
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try { |
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switch (resultsFormat) { |
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case Bytes: |
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return evaluateAsBytes(exchange); |
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case BytesSource: |
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return evaluateAsBytesSource(exchange); |
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case DOM: |
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return evaluateAsDOM(exchange); |
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case List: |
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return evaluateAsList(exchange); |
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case StringSource: |
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return evaluateAsStringSource(exchange); |
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case String: |
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default: |
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return evaluateAsString(exchange); |
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} |
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} |
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catch (Exception e) { |
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throw new RuntimeExpressionException(e); |
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} |
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} |
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public List evaluateAsList(E exchange) throws Exception { |
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return getExpression().evaluate(createDynamicContext(exchange)); |
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} |
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public Object evaluateAsStringSource(E exchange) throws Exception { |
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String text = evaluateAsString(exchange); |
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return new StringSource(text); |
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} |
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public Object evaluateAsBytesSource(E exchange) throws Exception { |
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byte[] bytes = evaluateAsBytes(exchange); |
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return new BytesSource(bytes); |
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} |
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public Node evaluateAsDOM(E exchange) throws Exception { |
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DOMResult result = new DOMResult(); |
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getExpression().pull(createDynamicContext(exchange), result, properties); |
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return result.getNode(); |
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} |
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public byte[] evaluateAsBytes(E exchange) throws Exception { |
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ByteArrayOutputStream buffer = new ByteArrayOutputStream(); |
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Result result = new StreamResult(buffer); |
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getExpression().pull(createDynamicContext(exchange), result, properties); |
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byte[] bytes = buffer.toByteArray(); |
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return bytes; |
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} |
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public String evaluateAsString(E exchange) throws Exception { |
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StringWriter buffer = new StringWriter(); |
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Result result = new StreamResult(buffer); |
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getExpression().pull(createDynamicContext(exchange), result, properties); |
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String text = buffer.toString(); |
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return text; |
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} |
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public boolean matches(E exchange) { |
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try { |
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List list = evaluateAsList(exchange); |
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return matches(exchange, list); |
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} |
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catch (Exception e) { |
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throw new RuntimeExpressionException(e); |
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} |
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} |
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public void assertMatches(String text, E exchange) throws AssertionError { |
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try { |
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List list = evaluateAsList(exchange); |
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if (!matches(exchange, list)) { |
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throw new AssertionError(this + " failed on " + exchange + " as evaluated: " + list); |
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} |
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} |
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catch (Exception e) { |
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throw new AssertionError(e); |
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} |
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} |
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public static <E extends Exchange> XQueryBuilder<E> xquery(final String queryText) { |
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return new XQueryBuilder<E>() { |
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protected XQueryExpression createQueryExpression(StaticQueryContext staticQueryContext) throws XPathException { |
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return staticQueryContext.compileQuery(queryText); |
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} |
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}; |
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} |
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public static <E extends Exchange> XQueryBuilder<E> xquery(final Reader reader) { |
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return new XQueryBuilder<E>() { |
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protected XQueryExpression createQueryExpression(StaticQueryContext staticQueryContext) throws XPathException, IOException { |
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return staticQueryContext.compileQuery(reader); |
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} |
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}; |
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} |
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public static <E extends Exchange> XQueryBuilder<E> xquery(final InputStream in, final String characterSet) { |
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return new XQueryBuilder<E>() { |
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protected XQueryExpression createQueryExpression(StaticQueryContext staticQueryContext) throws XPathException, IOException { |
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return staticQueryContext.compileQuery(in, characterSet); |
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} |
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}; |
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} |
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public XQueryBuilder<E> asBytes() { |
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setResultsFormat(ResultFormat.Bytes); |
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return this; |
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} |
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public XQueryBuilder<E> asBytesSource() { |
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setResultsFormat(ResultFormat.BytesSource); |
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return this; |
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} |
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public XQueryBuilder<E> asDOM() { |
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setResultsFormat(ResultFormat.DOM); |
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return this; |
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} |
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public XQueryBuilder<E> asDOMSource() { |
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setResultsFormat(ResultFormat.DOMSource); |
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return this; |
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} |
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public XQueryBuilder<E> asList() { |
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setResultsFormat(ResultFormat.List); |
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return this; |
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} |
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public XQueryBuilder<E> asString() { |
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setResultsFormat(ResultFormat.String); |
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return this; |
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} |
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public XQueryBuilder<E> asStringSource() { |
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setResultsFormat(ResultFormat.StringSource); |
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return this; |
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} |
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public XQueryBuilder<E> parameter(String name, Object value) { |
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parameters.put(name, value); |
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return this; |
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} |
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public XQueryExpression getExpression() throws IOException, XPathException { |
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if (expression == null) { |
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expression = createQueryExpression(getStaticQueryContext()); |
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clearBuilderReferences(); |
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} |
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return expression; |
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} |
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public Configuration getConfiguration() { |
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if (configuration == null) { |
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configuration = new Configuration(); |
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configuration.setHostLanguage(Configuration.XQUERY); |
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} |
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return configuration; |
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} |
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public void setConfiguration(Configuration configuration) { |
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this.configuration = configuration; |
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} |
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public StaticQueryContext getStaticQueryContext() { |
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if (staticQueryContext == null) { |
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staticQueryContext = new StaticQueryContext(getConfiguration()); |
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} |
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return staticQueryContext; |
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} |
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public void setStaticQueryContext(StaticQueryContext staticQueryContext) { |
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this.staticQueryContext = staticQueryContext; |
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} |
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public Map<String, Object> getParameters() { |
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return parameters; |
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} |
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public void setParameters(Map<String, Object> parameters) { |
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this.parameters = parameters; |
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} |
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public Properties getProperties() { |
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return properties; |
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} |
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public void setProperties(Properties properties) { |
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this.properties = properties; |
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} |
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public ResultFormat getResultsFormat() { |
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return resultsFormat; |
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} |
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public void setResultsFormat(ResultFormat resultsFormat) { |
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this.resultsFormat = resultsFormat; |
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} |
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protected abstract XQueryExpression createQueryExpression(StaticQueryContext staticQueryContext) throws XPathException, IOException; |
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protected DynamicQueryContext createDynamicContext(E exchange) throws Exception { |
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Configuration config = getConfiguration(); |
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DynamicQueryContext dynamicQueryContext = new DynamicQueryContext(config); |
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Source source = exchange.getIn().getBody(Source.class); |
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if (source == null) { |
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source = converter.toSource(converter.createDocument()); |
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} |
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DocumentInfo doc = getStaticQueryContext().buildDocument(source); |
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dynamicQueryContext.setContextItem(doc); |
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configureQuery(dynamicQueryContext, exchange); |
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return dynamicQueryContext; |
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} |
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protected void configureQuery(DynamicQueryContext dynamicQueryContext, Exchange exchange) throws Exception { |
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addParameters(dynamicQueryContext, exchange.getProperties()); |
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addParameters(dynamicQueryContext, exchange.getIn().getHeaders()); |
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addParameters(dynamicQueryContext, getParameters()); |
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dynamicQueryContext.setParameter("exchange", exchange); |
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dynamicQueryContext.setParameter("in", exchange.getIn()); |
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dynamicQueryContext.setParameter("out", exchange.getOut()); |
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} |
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protected void addParameters(DynamicQueryContext dynamicQueryContext, Map<String, Object> map) { |
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Set<Map.Entry<String, Object>> propertyEntries = map.entrySet(); |
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for (Map.Entry<String, Object> entry : propertyEntries) { |
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dynamicQueryContext.setParameter(entry.getKey(), entry.getValue()); |
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} |
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} |
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protected void clearBuilderReferences() { |
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staticQueryContext = null; |
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configuration = null; |
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} |
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protected boolean matches(E exchange, List results) { |
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return ObjectHelper.matches(results); |
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} |
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} |