package org.ff4j.web.taglib;
/*
* #%L
* ff4j-web
* %%
* Copyright (C) 2013 - 2014 Ff4J
* %%
* 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.
* #L%
*/
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
import org.ff4j.FF4j;
import org.ff4j.web.embedded.ConsoleConstants;
/**
* Parent class for FF4J TagLib library.
*
* @author <a href="mailto:cedrick.lunven@gmail.com">Cedrick LUNVEN</a>
*/
public abstract class AbstractFeatureTag extends TagSupport implements ConsoleConstants {
/** serial number. */
private static final long serialVersionUID = 3967425494402133171L;
/** Error message constant. */
protected static final String ERROR_MSG_START = "<p><span style=\"color:red;font-weight:bold\">ERROR <ff4j:*> :";
/** Error message constant. */
protected static final String ERROR_MSG_END = "</span>";
/** Injected by JSP itSelf. */
private String featureid = "";
/** FF4j bean name. */
private final String ff4jAttributeName = FF4J_SESSIONATTRIBUTE_NAME;
/**
* Display an error message in tag.
*
* @param message
* target message
* @throws IOException
* error
*/
protected void displayError(String message) throws IOException {
pageContext.getOut().print(ERROR_MSG_START + " " + message + ERROR_MSG_END);
}
/** {@inheritDoc} */
@Override
public int doStartTag() throws JspException {
try {
FF4j ff4j = (FF4j) pageContext.findAttribute(getFf4jAttributeName());
// Handle where no ff4j available
if (ff4j == null) {
displayError("Cannot find FF4J bean as attribute (" + getFf4jAttributeName() + ") in any scope.");
return SKIP_BODY;
}
// Handle where feature doe not exist
if (!ff4j.exist(getFeatureid())) {
displayError("Cannot find feature (" + getFeatureid() + ") anywhere.");
return SKIP_BODY;
}
// Everything is OK
if (eval(ff4j)) {
return EVAL_BODY_INCLUDE;
}
} catch (IOException ioe) {
throw new JspException("Error occur when processing TAG FF4J", ioe);
}
return SKIP_BODY;
}
protected abstract boolean eval(FF4j ff4j);
/**
* Getter accessor for attribute 'featureid'.
*
* @return current value of 'featureid'
*/
public String getFeatureid() {
return featureid;
}
/**
* Setter accessor for attribute 'featureid'.
*
* @param featureid
* new value for 'featureid '
*/
public void setFeatureid(String featureid) {
this.featureid = featureid;
}
/**
* Getter accessor for attribute 'ff4jAttributeName'.
*
* @return current value of 'ff4jAttributeName'
*/
public String getFf4jAttributeName() {
return ff4jAttributeName;
}
}