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Core components for extending Rexster.

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package com.tinkerpop.rexster.extension;

/**
 * Holds namespaces that define which extensions are allowed for a specific graph.
 *
 * @author Stephen Mallette (http://stephen.genoprime.com)
 */
public class ExtensionAllowed {
    private final String namespace;

    /**
     * Initializes a new ExtensionAllowed object as taken from rexster.xml.
     * The namespace may be wildcarded to be one of the follows: *:*, namespace:*, namespace:extension
     */
    public ExtensionAllowed(final String namespace) {
        // must match this format *:*, namespace:*, namespace:extension
        if (namespace == null || (!(namespace.matches("([\\w-]+|\\*):([\\w-]+|\\*)")
                && !(namespace.startsWith("*") && namespace.equals("*.*"))))) {
            throw new IllegalArgumentException("The namespace must match the format of *:*, namespace:*, namespace:extension");
        }

        this.namespace = namespace;
    }

    /**
     * Determines if the namespace and extension are allowed given the configuration of the graph in rexster.xml.
     */
    public boolean isExtensionAllowed(final ExtensionSegmentSet extensionSegmentSet) {
        boolean allowed = false;

        if (this.namespace.equals("*:*")) {
            allowed = true;
        } else if (this.namespace.equals(extensionSegmentSet.getNamespace() + ":*")) {
            allowed = true;
        } else if (this.namespace.equals(extensionSegmentSet.getNamespace() + ":" + extensionSegmentSet.getExtension())) {
            allowed = true;
        }

        return allowed;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        final ExtensionAllowed that = (ExtensionAllowed) o;

        if (!namespace.equals(that.namespace)) return false;

        return true;
    }

    @Override
    public int hashCode() {
        return namespace.hashCode();
    }
}