com.ocpsoft.pretty.faces.el.Expressions Maven / Gradle / Ivy
/*
* Copyright 2010 Lincoln Baxter, III
*
* 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 com.ocpsoft.pretty.faces.el;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Pattern;
import com.ocpsoft.pretty.faces.el.processor.PathParameterProcessor;
public class Expressions
{
public static final String EL_REGEX;
static
{
List processors = new ArrayList();
processors.addAll(ExpressionProcessorRunner.processors);
processors.addAll(ExpressionProcessorRunner.preProcessors);
String result = "(";
for (Iterator iter = processors.iterator(); iter.hasNext();)
{
PathParameterProcessor p = iter.next();
if (p.getRegex() != null)
{
result += "(" + p.getRegex() + ")";
if (iter.hasNext())
{
result += "|";
}
}
}
result += ")";
EL_REGEX = result;
}
/**
* The pattern to match a String EL expression. Regex Group 0 contains the
* entire expression, no more.
*/
public static final Pattern elPattern = Pattern.compile(EL_REGEX);
/**
* Return true if the value is an EL expression.
*/
public static boolean isEL(final String value)
{
if (value == null)
{
return false;
}
return elPattern.matcher(value).matches();
}
/**
* Return true if the value contains an EL expression.
*/
public static boolean containsEL(final String value)
{
if (value == null)
{
return false;
}
return elPattern.matcher(value).find();
}
}