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package javax.servlet;

import java.util.*;
import javax.servlet.annotation.HttpMethodConstraint;
import javax.servlet.annotation.ServletSecurity;

/**
 * Java Class represntation of a {@link ServletSecurity} annotation value.
 *
 * @since Servlet 3.0
 */
public class ServletSecurityElement extends HttpConstraintElement {

    private Collection methodNames;
    private Collection methodConstraints;

    /**
     * Constructs an instance using the default
     * HttpConstraintElement value as the default Constraint
     * element and with no HTTP Method specific constraint elements.
     */
    public ServletSecurityElement() {
        methodConstraints = new HashSet();
        methodNames = Collections.emptySet();
    }

    /**
     * Constructs an instance with a default Constraint element
     * and with no HTTP Method specific constraint elements.
     *
     * @param constraint the HttpConstraintElement to be
     * applied to all HTTP methods other than those represented in the
     * methodConstraints
     */
    public ServletSecurityElement(HttpConstraintElement constraint) {
        super(constraint.getEmptyRoleSemantic(),
                constraint.getTransportGuarantee(),
                constraint.getRolesAllowed());
        methodConstraints = new HashSet();
        methodNames = Collections.emptySet();
    }

    /**
     * Constructs an instance using the default
     * HttpConstraintElement value as the default Constraint
     * element and with a collection of HTTP Method specific constraint
     * elements.
     *
     * @param methodConstraints the collection of HTTP method specific
     * constraint elements
     *
     * @throws IllegalArgumentException if duplicate method names are
     * detected
     */
    public ServletSecurityElement(
            Collection methodConstraints) {
        this.methodConstraints = (methodConstraints == null ?
            new HashSet() : methodConstraints);
        methodNames = checkMethodNames(this.methodConstraints);
    }

    /**
     * Constructs an instance with a default Constraint element
     * and with a collection of HTTP Method specific constraint elements.
     *
     * @param constraint the HttpConstraintElement to be
     * applied to all HTTP methods other than those represented in the
     * methodConstraints
     * @param methodConstraints the collection of HTTP method specific
     * constraint elements.
     *
     * @throws IllegalArgumentException if duplicate method names are
     * detected
     */
    public ServletSecurityElement(HttpConstraintElement constraint,
            Collection methodConstraints) {
        super(constraint.getEmptyRoleSemantic(),
                constraint.getTransportGuarantee(),
                constraint.getRolesAllowed());
        this.methodConstraints = (methodConstraints == null ?
            new HashSet() : methodConstraints);
        methodNames = checkMethodNames(this.methodConstraints);
    }

    /**
     * Constructs an instance from a {@link ServletSecurity} annotation value.
     *
     * @param annotation the annotation value
     *
     * @throws IllegalArgumentException if duplicate method names are
     * detected
     */
    public ServletSecurityElement(ServletSecurity annotation) {
        super(annotation.value().value(),
                annotation.value().transportGuarantee(),
                annotation.value().rolesAllowed());
        this.methodConstraints = new HashSet();
        for (HttpMethodConstraint constraint :
                annotation.httpMethodConstraints()) {
            this.methodConstraints.add(
                new HttpMethodConstraintElement(
                    constraint.value(),
                    new HttpConstraintElement(constraint.emptyRoleSemantic(),
                        constraint.transportGuarantee(),
                        constraint.rolesAllowed())));
        }
        methodNames = checkMethodNames(this.methodConstraints);
    }

    /**
     * Gets the (possibly empty) collection of HTTP Method specific
     * constraint elements.
     *
     * 

If permitted, any changes to the returned Collection must not * affect this ServletSecurityElement. * * * @return the (possibly empty) collection of HttpMethodConstraintElement * objects */ public Collection getHttpMethodConstraints() { return Collections.unmodifiableCollection(methodConstraints); } /** * Gets the set of HTTP method names named by the HttpMethodConstraints. * *

If permitted, any changes to the returned Collection must not * affect this ServletSecurityElement. * * * @return the collection String method names */ public Collection getMethodNames() { return Collections.unmodifiableCollection(methodNames); } /** * Checks for duplicate method names in methodConstraints. * * @param methodConstraints * * @retrun Set of method names * * @throws IllegalArgumentException if duplicate method names are * detected */ private Collection checkMethodNames( Collection methodConstraints) { Collection methodNames = new HashSet(); for (HttpMethodConstraintElement methodConstraint : methodConstraints) { String methodName = methodConstraint.getMethodName(); if (!methodNames.add(methodName)) { throw new IllegalArgumentException( "Duplicate HTTP method name: " + methodName); } } return methodNames; } }





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