Example usage for org.apache.commons.lang3 CharUtils isAsciiAlphaLower

Introduction

In this page you can find the example usage for org.apache.commons.lang3 CharUtils isAsciiAlphaLower.

Prototype

public static boolean isAsciiAlphaLower(final char ch) 

Source Link

Document

Checks whether the character is ASCII 7 bit alphabetic lower case.

 CharUtils.isAsciiAlphaLower('a')  = true CharUtils.isAsciiAlphaLower('A')  = false CharUtils.isAsciiAlphaLower('3')  = false CharUtils.isAsciiAlphaLower('-')  = false CharUtils.isAsciiAlphaLower('\n') = false CharUtils.isAsciiAlphaLower('©') = false 

Usage

From source file:org.xlrnet.tibaija.processor.ExecutionEnvironment.java

/**
 * Register a command as an expression function in the execution environment. All programs and other commands can
 * use the new function once it has been registered. Every command may only be associated with at most one execution
 * environment. If a command is registered as a function expression (i.e. through this function) it can be used in
 * or as an expression and must return a value.
 *
 * @param commandName/* w  w  w. ja  va  2 s. c  o  m*/
 *         Name of the new command under which it can be accessed.
 * @param command
 *         An instance of the concrete command.
 */
public void registerExpressionFunction(@NotNull String commandName, @NotNull Command command)
        throws TIRuntimeException {
    checkNotNull(commandName);
    checkNotNull(command);

    checkArgument(StringUtils.isNotBlank(commandName), "Expression function name may not be blank");
    Character firstChar = commandName.charAt(0);
    checkArgument(CharUtils.isAsciiAlphaLower(firstChar) || !CharUtils.isAsciiAlphanumeric(firstChar),
            "Expression function name must begin with a lowercase letter or be non-alphanumeric");

    if (expressionFunction.get(commandName) != null)
        throw new DuplicateCommandException("Function expression name is already registered: " + commandName);

    if (command.getEnvironment() != null)
        throw new DuplicateCommandException(
                "New command instance is already registered in another environment");

    command.setEnvironment(this);
    expressionFunction.put(commandName, command);

    LOGGER.debug("Registered new expression function '{}'", commandName);
}

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