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package org.apache.camel.builder.xml; |
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import static org.apache.camel.converter.ObjectConverter.toBoolean; |
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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.Message; |
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import org.w3c.dom.Document; |
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import org.w3c.dom.Element; |
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import org.xml.sax.InputSource; |
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import javax.xml.namespace.QName; |
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import javax.xml.xpath.XPath; |
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import javax.xml.xpath.XPathConstants; |
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import javax.xml.xpath.XPathExpression; |
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import javax.xml.xpath.XPathExpressionException; |
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import javax.xml.xpath.XPathFactory; |
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import javax.xml.xpath.XPathFactoryConfigurationException; |
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import javax.xml.xpath.XPathFunctionResolver; |
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import java.io.StringReader; |
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public class XPathBuilder<E extends Exchange> implements Expression<E>, Predicate<E> { |
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private final String text; |
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private XPathFactory xpathFactory; |
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private Class documentType = Document.class; |
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private QName resultType = null; |
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private String objectModelUri = null; |
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private DefaultNamespaceContext namespaceContext; |
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private XPathFunctionResolver functionResolver; |
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private XPathExpression expression; |
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private MessageVariableResolver variableResolver = new MessageVariableResolver(); |
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public static XPathBuilder xpath(String text) { |
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return new XPathBuilder(text); |
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} |
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public XPathBuilder(String text) { |
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this.text = text; |
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} |
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@Override |
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public String toString() { |
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return "XPath: " + text; |
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} |
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public boolean matches(E exchange) { |
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Object booleanResult = evaluateAs(exchange, XPathConstants.BOOLEAN); |
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return toBoolean(booleanResult); |
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} |
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public void assertMatches(String text, E exchange) throws AssertionError { |
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Object booleanResult = evaluateAs(exchange, XPathConstants.BOOLEAN); |
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if (!toBoolean(booleanResult)) { |
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throw new AssertionError(this + " failed on " + exchange + " as returned <" + booleanResult + ">"); |
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} |
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} |
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public Object evaluate(E exchange) { |
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return evaluateAs(exchange, resultType); |
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} |
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public XPathBuilder<E> booleanResult() { |
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resultType = XPathConstants.BOOLEAN; |
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return this; |
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} |
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public XPathBuilder<E> nodeResult() { |
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resultType = XPathConstants.NODE; |
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return this; |
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} |
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public XPathBuilder<E> nodeSetResult() { |
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resultType = XPathConstants.NODESET; |
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return this; |
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} |
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public XPathBuilder<E> numberResult() { |
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resultType = XPathConstants.NUMBER; |
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return this; |
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} |
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public XPathBuilder<E> stringResult() { |
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resultType = XPathConstants.STRING; |
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return this; |
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} |
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public XPathBuilder<E> objectModel(String uri) { |
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this.objectModelUri = uri; |
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return this; |
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} |
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public XPathBuilder<E> functionResolver(XPathFunctionResolver functionResolver) { |
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this.functionResolver = functionResolver; |
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return this; |
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} |
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public XPathBuilder<E> namespace(String prefix, String uri) { |
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getNamespaceContext().add(prefix, uri); |
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return this; |
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} |
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public XPathBuilder<E> variable(String name, Object value) { |
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variableResolver.addVariable(name, value); |
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return this; |
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} |
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public XPathFactory getXPathFactory() throws XPathFactoryConfigurationException { |
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if (xpathFactory == null) { |
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if (objectModelUri != null) { |
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xpathFactory = XPathFactory.newInstance(objectModelUri); |
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} |
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xpathFactory = XPathFactory.newInstance(); |
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} |
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return xpathFactory; |
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} |
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public void setXPathFactory(XPathFactory xpathFactory) { |
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this.xpathFactory = xpathFactory; |
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} |
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public Class getDocumentType() { |
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return documentType; |
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} |
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public void setDocumentType(Class documentType) { |
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this.documentType = documentType; |
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} |
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public String getText() { |
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return text; |
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} |
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public QName getResultType() { |
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return resultType; |
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} |
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public DefaultNamespaceContext getNamespaceContext() { |
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if (namespaceContext == null) { |
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try { |
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namespaceContext = new DefaultNamespaceContext(getXPathFactory()); |
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} |
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catch (XPathFactoryConfigurationException e) { |
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throw new RuntimeExpressionException(e); |
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} |
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} |
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return namespaceContext; |
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} |
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public void setNamespaceContext(DefaultNamespaceContext namespaceContext) { |
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this.namespaceContext = namespaceContext; |
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} |
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public XPathFunctionResolver getFunctionResolver() { |
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return functionResolver; |
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} |
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public void setFunctionResolver(XPathFunctionResolver functionResolver) { |
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this.functionResolver = functionResolver; |
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} |
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public XPathExpression getExpression() throws XPathFactoryConfigurationException, XPathExpressionException { |
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if (expression == null) { |
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expression = createXPathExpression(); |
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} |
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return expression; |
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} |
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public void setNamespacesFromDom(Element node) { |
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getNamespaceContext().setNamespacesFromDom(node); |
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} |
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protected synchronized Object evaluateAs(E exchange, QName resultType) { |
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variableResolver.setExchange(exchange); |
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try { |
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Object document = getDocument(exchange); |
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if (resultType != null) { |
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if (document instanceof InputSource) { |
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InputSource inputSource = (InputSource) document; |
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return getExpression().evaluate(inputSource, resultType); |
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} |
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else { |
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return getExpression().evaluate(document, resultType); |
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} |
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} |
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else { |
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if (document instanceof InputSource) { |
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InputSource inputSource = (InputSource) document; |
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return getExpression().evaluate(inputSource); |
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} |
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else { |
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return getExpression().evaluate(document); |
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} |
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} |
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} |
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catch (XPathExpressionException e) { |
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throw new InvalidXPathExpression(getText(), e); |
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} |
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catch (XPathFactoryConfigurationException e) { |
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throw new InvalidXPathExpression(getText(), e); |
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} |
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} |
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protected XPathExpression createXPathExpression() throws XPathExpressionException, XPathFactoryConfigurationException { |
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XPath xPath = getXPathFactory().newXPath(); |
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xpathFactory = null; |
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xPath.setNamespaceContext(getNamespaceContext()); |
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xPath.setXPathVariableResolver(variableResolver); |
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if (functionResolver != null) { |
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xPath.setXPathFunctionResolver(functionResolver); |
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} |
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return xPath.compile(text); |
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} |
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protected Object getDocument(E exchange) { |
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Message in = exchange.getIn(); |
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Class type = getDocumentType(); |
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Object answer = null; |
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if (type != null) { |
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answer = in.getBody(type); |
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} |
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if (answer == null) { |
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answer = in.getBody(); |
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} |
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if (answer instanceof String) { |
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answer = new InputSource(new StringReader(answer.toString())); |
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} |
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return answer; |
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} |
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} |