/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.cocoon.woody.transformation;
import java.io.IOException;
import java.io.StringReader;
import java.util.Locale;
import java.util.Map;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.cocoon.components.flow.FlowHelper;
import org.apache.cocoon.components.flow.WebContinuation;
import org.apache.cocoon.environment.ObjectModelHelper;
import org.apache.cocoon.environment.Request;
import org.apache.cocoon.environment.Session;
import org.apache.cocoon.i18n.I18nUtils;
import org.apache.cocoon.woody.formmodel.Form;
import org.apache.cocoon.xml.AttributesImpl;
import org.apache.commons.jxpath.JXPathContext;
import org.apache.commons.jxpath.JXPathException;
import org.apache.commons.jxpath.Variables;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* WoodyPipeLineConfig
*
* @version CVS $Id: WoodyPipelineConfig.java,v 1.7 2004/03/09 13:54:12 reinhard Exp $
*/
public class WoodyPipelineConfig {
/**
* Default key under which the woody form is stored in the JXPath context.
*/
public static final String WOODY_FORM = "woody-form";
/**
* Name of the request attribute under which the Woody form is stored (optional). */
private final String attributeName;
/**
* Pointer to the current request object. */
private final Request request;
/**
* Initialized jxpathcontext to evaluate passed expressions with. */
private final JXPathContext jxpathContext;
/**
* Containts locale specified as a parameter to the transformer, if any. */
private final Locale localeParameter;
/**
* The locale currently used by the transformer. */
private Locale locale;
/**
* Value for the action attribute of the form.
*/
private String formAction;
/**
* Value for the method attribute of the form.
*/
private String formMethod;
private WoodyPipelineConfig(JXPathContext jxpc, Request req, Locale localeParam,
String attName, String actionExpression, String method) {
this.attributeName = attName;
this.request = req;
this.jxpathContext =jxpc;
this.localeParameter = localeParam;
this.formAction = translateText(actionExpression);
this.formMethod = method;
}
/**
* Creates and initializes a WoodyPipelineConfig object based on the passed
* arguments of the setup() of the specific Pipeline-component.
*
* @param objectModel the objectmodel as passed in the setup()
* @param parameters the parameters as passed in the setup()
* @return an instance of WoodyPipelineConfig initialized according to the
* settings in the sitemap.
*/
public static WoodyPipelineConfig createConfig(Map objectModel, Parameters parameters) {
// create and set the jxpathContext...
Object flowContext = FlowHelper.getContextObject(objectModel);
WebContinuation wk = FlowHelper.getWebContinuation(objectModel);
JXPathContext jxpc = JXPathContext.newContext(flowContext);
Variables vars = jxpc.getVariables();
vars.declareVariable("continuation", wk);
Request request = ObjectModelHelper.getRequest(objectModel);
vars.declareVariable("request", request);
Session session = request.getSession(false);
vars.declareVariable("session", session);
vars.declareVariable("parameters", parameters);
Locale localeParameter = null;
String localeStr = parameters.getParameter("locale", null);
if (localeStr != null) {
localeParameter = I18nUtils.parseLocale(localeStr);
}
String attributeName = parameters.getParameter("attribute-name", null);
String actionExpression = parameters.getParameter("form-action", null);
String formMethod = parameters.getParameter("form-method", "POST");
//TODO (20031223 mpo)think about adding form-encoding for the Generator.
// Note generator will also need some text to go on the submit-button?
// Alternative to adding more here is to apply xinclude ?
return new WoodyPipelineConfig(jxpc, request, localeParameter,
attributeName, actionExpression, formMethod);
}
/**
* Overloads {@link #findForm(String)} by setting the jxpath-expression to null
*/
public Form findForm() throws SAXException {
return this.findForm(null);
}
/**
* Finds the form from the current request-context based on the settings of
* this configuration object. The fall-back search-procedure is as follows:
* <ol><li>Use the provided jxpathExpression (if not null)</li>
* <li>Use the setting of the 'attribute-name' parameter on the request</li>
* <li>Obtain the form from it's default location in the flow context</li>
* </ol>
*
* @param jxpathExpression that should be pointing to the form
* @return the found form if found
* @throws SAXException in any of the following cases:
* <ul><li>The provided jxpathExpression (if not null) not point to a
* {@link Form} instance.</li>
* <li>The request is not holding a {@link Form} instance under the key
* specified by 'attribute-name' (if specified)</li>
* <li>Both jxpathExpression and 'attribute-name' were not specified AND
* also the default location was not holding a valid {@link Form} instance.</li>
* </ol>
*/
public Form findForm(String jxpathExpression) throws SAXException {
Object form = null;
if (jxpathExpression != null) {
form = this.jxpathContext.getValue(jxpathExpression);
if (form == null) {
throw new SAXException("No form found at location \"" + jxpathExpression + "\".");
} else if (!(form instanceof Form)) {
throw new SAXException("Object returned by expression \"" + jxpathExpression + "\" is not a Woody Form.");
}
} else if (this.attributeName != null) { // then see if an attribute-name was specified
form = this.request.getAttribute(this.attributeName);
if (form == null) {
throw new SAXException("No form found in request attribute with name \"" + this.attributeName + "\"");
} else if (!(form instanceof Form)) {
throw new SAXException("Object found in request (attribute = '" + this.attributeName + "') is not a Woody Form.");
}
} else { // and then see if we got a form from the flow
jxpathExpression = "/" + WoodyPipelineConfig.WOODY_FORM;
try {
form = this.jxpathContext.getValue(jxpathExpression);
} catch (JXPathException e) { /* do nothing */ }
if (form == null) {
throw new SAXException("No Woody form found.");
}
}
return (Form)form;
}
/**
* Replaces JXPath expressions embedded inside #{ and } by their value.
* This will parse the passed String looking for #{} occurences and then
* uses the {@link #evaluateExpression(String)} to evaluate the found expression.
*
* @return the original String with it's #{}-parts replaced by the evaulated results.
*/
public String translateText(String original) {
if (original==null) {
return null;
}
StringBuffer expression;
StringBuffer translated = new StringBuffer();
StringReader in = new StringReader(original);
int chr;
try {
while ((chr = in.read()) != -1) {
char c = (char) chr;
if (c == '#') {
chr = in.read();
if (chr != -1) {
c = (char) chr;
if (c == '{') {
expression = new StringBuffer();
boolean more = true;
while ( more ) {
more = false;
if ((chr = in.read()) != -1) {
c = (char)chr;
if (c != '}') {
expression.append(c);
more = true;
} else {
translated.append(evaluateExpression(expression.toString()).toString());
}
} else {
translated.append('#').append('{').append(expression);
}
}
}
} else {
translated.append((char) chr);
}
} else {
translated.append(c);
}
}
} catch (IOException ignored) {
ignored.printStackTrace();
}
return translated.toString();
}
/**
* Evaluates the passed xpath expression using the internal jxpath context
* holding the declared variables:
* <ol><li>continuation: as made available by flowscript</li>
* <li>request: as present in the cocoon processing environment</li>
* <li>session: as present in the cocoon processing environment</li>
* <li>parameters: as present in the cocoon sitemap node of the pipeline component</li></ol>
*
* @param expression
* @return the object-value resulting the expression evaluation.
*/
public Object evaluateExpression(String expression) {
return this.jxpathContext.getValue(expression);
}
public Locale getLocale() {
return locale;
}
public void setLocale(Locale locale) {
this.locale = locale;
}
public Locale getLocaleParameter() {
return localeParameter;
}
/**
* The value for the wi:form-generated/@action.
* Note: wi:form-template copies this from its wt:form-template counterpart.
*
* @return the {@link #translateText(String)} result of the 'form-action' sitemap
* parameter to the pipeline component, or null if that parameter was not set.
*/
public String getFormAction() {
return formAction;
}
/**
* The value for the wi:form-generated/@method.
* Note: wi:form-template copies this from its wt:form-template counterpart.
*
* @return the value of the 'form-method' sitemap parameter to the pipeline
* component. Defaults to 'POST' if it was not set.
*/
public String getFormMethod() {
return formMethod;
}
/**
* The grouped attributes to set on the wi:form-generated element.
* Note: wi:form-template copies this from its wt:form-template counterpart.
*
* @see #getFormAction()
* @see #getFormMethod()
*/
public Attributes getFormAttributes() {
AttributesImpl formAtts = new AttributesImpl();
if (getFormAction() != null) {
formAtts.addCDATAAttribute("action", getFormAction());
}
formAtts.addCDATAAttribute("method", getFormMethod());
return formAtts;
}
}