function Context::getContextValue

Overrides ContextInterface::getContextValue

File

core/lib/Drupal/Component/Plugin/Context/Context.php, line 44

Class

Context

A generic context class for wrapping data a plugin needs to operate.

Namespace

Code

public function getContextValue() {
    // Support optional contexts.
    if (!isset($this->contextValue)) {
        $definition = $this->getContextDefinition();
        $default_value = $definition->getDefaultValue();
        if (!isset($default_value) && $definition->isRequired()) {
            $type = $definition->getDataType();
            throw new ContextException(sprintf("The %s context is required and not present.", $type));
        }
        // Keep the default value here so that subsequent calls don't have to look
        // it up again.
        $this->contextValue = $default_value;
    }
    return $this->contextValue;
}