javax.servlet.ServletSecurityElement.java Source code

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/*
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 *
 * Copyright (c) 2017-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
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package javax.servlet;

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

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

    private Collection<String> methodNames;
    private Collection<HttpMethodConstraintElement> methodConstraints;

    /**
     * Constructs an instance using the default
     * <code>HttpConstraintElement</code> value as the default Constraint
     * element and with no HTTP Method specific constraint elements.
     */
    public ServletSecurityElement() {
        methodConstraints = new HashSet<HttpMethodConstraintElement>();
        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
     * <tt>methodConstraints</tt>
     */
    public ServletSecurityElement(HttpConstraintElement constraint) {
        super(constraint.getEmptyRoleSemantic(), constraint.getTransportGuarantee(), constraint.getRolesAllowed());
        methodConstraints = new HashSet<HttpMethodConstraintElement>();
        methodNames = Collections.emptySet();
    }

    /**
     * Constructs an instance using the default
     * <code>HttpConstraintElement</code> 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<HttpMethodConstraintElement> methodConstraints) {
        this.methodConstraints = (methodConstraints == null ? new HashSet<HttpMethodConstraintElement>()
                : 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
     * <tt>methodConstraints</tt>
     * @param methodConstraints the collection of HTTP method specific
     * constraint elements.
     *
     * @throws IllegalArgumentException if duplicate method names are
     * detected
     */
    public ServletSecurityElement(HttpConstraintElement constraint,
            Collection<HttpMethodConstraintElement> methodConstraints) {
        super(constraint.getEmptyRoleSemantic(), constraint.getTransportGuarantee(), constraint.getRolesAllowed());
        this.methodConstraints = (methodConstraints == null ? new HashSet<HttpMethodConstraintElement>()
                : 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<HttpMethodConstraintElement>();
        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.
     *
     * <p>If permitted, any changes to the returned <code>Collection</code> must not
     * affect this <code>ServletSecurityElement</code>.
     *
     *
     * @return the (possibly empty) collection of HttpMethodConstraintElement
     * objects
     */
    public Collection<HttpMethodConstraintElement> getHttpMethodConstraints() {
        return Collections.unmodifiableCollection(methodConstraints);
    }

    /**
     * Gets the set of HTTP method names named by the HttpMethodConstraints.
     *
     *  <p>If permitted, any changes to the returned <code>Collection</code> must not
     * affect this <code>ServletSecurityElement</code>.
     *
        
     *
     * @return the collection String method names
     */
    public Collection<String> 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<String> checkMethodNames(Collection<HttpMethodConstraintElement> methodConstraints) {
        Collection<String> methodNames = new HashSet<String>();
        for (HttpMethodConstraintElement methodConstraint : methodConstraints) {
            String methodName = methodConstraint.getMethodName();
            if (!methodNames.add(methodName)) {
                throw new IllegalArgumentException("Duplicate HTTP method name: " + methodName);
            }
        }
        return methodNames;
    }
}