/*
* $Id: CompareTagBase.java 471754 2006-11-06 14:55:09Z husted $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.struts.taglib.logic;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.struts.taglib.TagUtils;
import org.apache.struts.util.MessageResources;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import java.lang.reflect.InvocationTargetException;
/**
* Abstract base class for comparison tags. Concrete subclasses need only
* define values for desired1 and desired2.
*
* @version $Rev: 471754 $ $Date: 2004-10-16 12:38:42 -0400 (Sat, 16 Oct 2004)
* $
*/
public abstract class CompareTagBase extends ConditionalTagBase {
// ----------------------------------------------------- Instance Variables
/**
* We will do a double/float comparison.
*/
protected static final int DOUBLE_COMPARE = 0;
/**
* We will do a long/int comparison.
*/
protected static final int LONG_COMPARE = 1;
/**
* We will do a String comparison.
*/
protected static final int STRING_COMPARE = 2;
/**
* The message resources for this package.
*/
protected static MessageResources messages =
MessageResources.getMessageResources(
"org.apache.struts.taglib.logic.LocalStrings");
// ------------------------------------------------------------ Properties
/**
* The value to which the variable specified by other attributes of this
* tag will be compared.
*/
public String value = null;
public String getValue() {
return (this.value);
}
public void setValue(String value) {
this.value = value;
}
// --------------------------------------------------------- Public Methods
/**
* Release all allocated resources.
*/
public void release() {
super.release();
value = null;
}
// ------------------------------------------------------ Protected Methods
/**
* Evaluate the condition that is being tested by this particular tag, and
* return <code>true</code> if the nested body content of this tag should
* be evaluated, or <code>false</code> if it should be skipped. This
* method must be implemented by concrete subclasses.
*
* @throws JspException if a JSP exception occurs
*/
protected abstract boolean condition()
throws JspException;
/**
* Evaluate the condition that is being tested by this particular tag, and
* return <code>true</code> if the nested body content of this tag should
* be evaluated, or <code>false</code> if it should be skipped. This
* method must be implemented by concrete subclasses.
*
* @param desired1 First desired value for a true result (-1, 0, +1)
* @param desired2 Second desired value for a true result (-1, 0, +1)
* @throws JspException if a JSP exception occurs
*/
protected boolean condition(int desired1, int desired2)
throws JspException {
// Acquire the value and determine the test type
int type = -1;
double doubleValue = 0.0;
long longValue = 0;
if ((type < 0) && (value.length() > 0)) {
try {
doubleValue = Double.parseDouble(value);
type = DOUBLE_COMPARE;
} catch (NumberFormatException e) {
;
}
}
if ((type < 0) && (value.length() > 0)) {
try {
longValue = Long.parseLong(value);
type = LONG_COMPARE;
} catch (NumberFormatException e) {
;
}
}
if (type < 0) {
type = STRING_COMPARE;
}
// Acquire the unconverted variable value
Object variable = null;
if (cookie != null) {
Cookie[] cookies =
((HttpServletRequest) pageContext.getRequest()).getCookies();
if (cookies == null) {
cookies = new Cookie[0];
}
for (int i = 0; i < cookies.length; i++) {
if (cookie.equals(cookies[i].getName())) {
variable = cookies[i].getValue();
break;
}
}
} else if (header != null) {
variable =
((HttpServletRequest) pageContext.getRequest()).getHeader(header);
} else if (name != null) {
Object bean =
TagUtils.getInstance().lookup(pageContext, name, scope);
if (property != null) {
if (bean == null) {
JspException e =
new JspException(messages.getMessage("logic.bean", name));
TagUtils.getInstance().saveException(pageContext, e);
throw e;
}
try {
variable = PropertyUtils.getProperty(bean, property);
} catch (InvocationTargetException e) {
Throwable t = e.getTargetException();
if (t == null) {
t = e;
}
TagUtils.getInstance().saveException(pageContext, t);
throw new JspException(messages.getMessage(
"logic.property", name, property, t.toString()));
} catch (Throwable t) {
TagUtils.getInstance().saveException(pageContext, t);
throw new JspException(messages.getMessage(
"logic.property", name, property, t.toString()));
}
} else {
variable = bean;
}
} else if (parameter != null) {
variable = pageContext.getRequest().getParameter(parameter);
} else {
JspException e =
new JspException(messages.getMessage("logic.selector"));
TagUtils.getInstance().saveException(pageContext, e);
throw e;
}
if (variable == null) {
variable = ""; // Coerce null to a zero-length String
}
// Perform the appropriate comparison
int result = 0;
if (type == DOUBLE_COMPARE) {
try {
double doubleVariable = Double.parseDouble(variable.toString());
if (doubleVariable < doubleValue) {
result = -1;
} else if (doubleVariable > doubleValue) {
result = +1;
}
} catch (NumberFormatException e) {
result = variable.toString().compareTo(value);
}
} else if (type == LONG_COMPARE) {
try {
long longVariable = Long.parseLong(variable.toString());
if (longVariable < longValue) {
result = -1;
} else if (longVariable > longValue) {
result = +1;
}
} catch (NumberFormatException e) {
result = variable.toString().compareTo(value);
}
} else {
result = variable.toString().compareTo(value);
}
// Normalize the result
if (result < 0) {
result = -1;
} else if (result > 0) {
result = +1;
}
// Return true if the result matches either desired value
return ((result == desired1) || (result == desired2));
}
}