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/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 * 
 * You can obtain a copy of the license at
 * http://www.opensource.org/licenses/cddl1.php
 * See the License for the specific language governing
 * permissions and limitations under the License.
 */

/*
 * CacheControl.java
 *
 * Created on March 5, 2007, 3:36 PM
 */

package javax.ws.rs.core;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * An abstraction for the value of a HTTP Cache-Control response header.
 * @see HTTP/1.1 section 14.9
 */
public class CacheControl {
    private boolean _public;
    private boolean _private;
    private List privateFields;
    private boolean noCache;
    private List noCacheFields;
    private boolean noStore;
    private boolean noTransform;
    private boolean mustRevalidate;
    private boolean proxyRevalidate;
    private int maxAge = -1;
    private int sMaxAge = -1;
    private Map cacheExtension;
    
    /**
     * Create a new instance of CacheControl. The new instance will have the 
     * following default settings:
     *
     * 
     * public = true
     * private = false
     * noCache = false
     * noStore = false
     * noTransform = true
     * mustRevalidate = false
     * proxyRevalidate = false
     * An empty list of private fields
     * An empty list of no-cache fields
     * An empty list of cache extensions
     * 
     */
    public CacheControl() {
        _public = true;
        _private = false;
        noCache = false;
        noStore = false;
        noTransform = true;
        mustRevalidate = false;
        proxyRevalidate = false;
    }

    /**
     * Corresponds to the must-revalidate cache control directive.
     * @return true if the must-revalidate cache control directive will be included in the
     * response, false otherwise.
     * @see HTTP/1.1 section 14.9.4
     */
    public boolean isMustRevalidate() {
        return mustRevalidate;
    }

    /**
     * Corresponds to the must-revalidate cache control directive.
     * @param mustRevalidate true if the must-revalidate cache control directive should be included in the
     * response, false otherwise.
     * @see HTTP/1.1 section 14.9.4
     */
    public void setMustRevalidate(boolean mustRevalidate) {
        this.mustRevalidate = mustRevalidate;
    }

    /**
     * Corresponds to the proxy-revalidate cache control directive.
     * @return true if the proxy-revalidate cache control directive will be included in the
     * response, false otherwise.
     * @see HTTP/1.1 section 14.9.4
     */
    public boolean isProxyRevalidate() {
        return proxyRevalidate;
    }

    /**
     * Corresponds to the must-revalidate cache control directive.
     * @param proxyRevalidate true if the proxy-revalidate cache control directive should be included in the
     * response, false otherwise.
     * @see HTTP/1.1 section 14.9.4
     */
    public void setProxyRevalidate(boolean proxyRevalidate) {
        this.proxyRevalidate = proxyRevalidate;
    }

    /**
     * Corresponds to the max-age cache control directive.
     * @return the value of the max-age cache control directive, -1 if the directive is disabled.
     * @see HTTP/1.1 section 14.9.3
     */
    public int getMaxAge() {
        return maxAge;
    }

    /**
     * Corresponds to the max-age cache control directive.
     * @param maxAge the value of the max-age cache control directive, a value of -1 will disable the directive.
     * @see HTTP/1.1 section 14.9.3
     */
    public void setMaxAge(int maxAge) {
        this.maxAge = maxAge;
    }

    /**
     * Corresponds to the s-maxage cache control directive.
     * @return the value of the s-maxage cache control directive, -1 if the directive is disabled.
     * @see HTTP/1.1 section 14.9.3
     */
    public int getSMaxAge() {
        return sMaxAge;
    }

    /**
     * Corresponds to the s-maxage cache control directive.
     * @param sMaxAge the value of the s-maxage cache control directive, a value of -1 will disable the directive.
     * @see HTTP/1.1 section 14.9.3
     */
    public void setSMaxAge(int sMaxAge) {
        this.sMaxAge = sMaxAge;
    }

    /**
     * Corresponds to the value of the no-cache cache control directive.
     * @return a mutable list of field-names that will form the value of the no-cache cache control directive.
     * An empty list results in a bare no-cache directive.
     * @see #isNoCache
     * @see #setNoCache
     * @see HTTP/1.1 section 14.9.1
     */
    public List getNoCacheFields() {
        if (noCacheFields == null)
            noCacheFields = new ArrayList();
        return noCacheFields;
    }

    /**
     * Corresponds to the no-cache cache control directive.
     * @param noCache true if the no-cache cache control directive should be included in the
     * response, false otherwise.
     * @see #getNoCacheFields
     * @see HTTP/1.1 section 14.9.1
     */
    public void setNoCache(boolean noCache) {
        this.noCache = noCache;
    }

    /**
     * Corresponds to the no-cache cache control directive.
     * @return true if the no-cache cache control directive will be included in the
     * response, false otherwise.
     * @see #getNoCacheFields
     * @see HTTP/1.1 section 14.9.1
     */
    public boolean isNoCache() {
        return noCache;
    }

    /**
     * Corresponds to the public cache control directive.
     * @return true if the public cache control directive will be included in the
     * response, false otherwise.
     * @see HTTP/1.1 section 14.9.1
     */
    public boolean isPublic() {
        return _public;
    }

    /**
     * Corresponds to the public cache control directive.
     * @param _public true if the public cache control directive should be included in the
     * response, false otherwise.
     * @see HTTP/1.1 section 14.9.1
     */
    public void setPublic(boolean _public) {
        this._public = _public;
    }

    /**
     * Corresponds to the private cache control directive.
     * @return true if the private cache control directive will be included in the
     * response, false otherwise.
     * @see #getPrivateFields
     * @see HTTP/1.1 section 14.9.1
     */
    public boolean isPrivate() {
        return _private;
    }

    /**
     * Corresponds to the value of the private cache control directive.
     * @return a mutable list of field-names that will form the value of the private cache control directive.
     * An empty list results in a bare no-cache directive.
     * @see #isPrivate
     * @see #setPrivate
     * @see HTTP/1.1 section 14.9.1
     */
    public List getPrivateFields() {
        if (privateFields == null)
            privateFields = new ArrayList();
        return privateFields;
    }

    /**
     * Corresponds to the private cache control directive.
     * @param _private true if the private cache control directive should be included in the
     * response, false otherwise.
     * @see #getPrivateFields
     * @see HTTP/1.1 section 14.9.1
     */
    public void setPrivate(boolean _private) {
        this._private = _private;
    }

    /**
     * Corresponds to the no-transform cache control directive.
     * @return true if the no-transform cache control directive will be included in the
     * response, false otherwise.
     * @see HTTP/1.1 section 14.9.5
     */
    public boolean isNoTransform() {
        return noTransform;
    }

    /**
     * Corresponds to the no-transform cache control directive.
     * @param noTransform true if the no-transform cache control directive should be included in the
     * response, false otherwise.
     * @see HTTP/1.1 section 14.9.5
     */
    public void setNoTransform(boolean noTransform) {
        this.noTransform = noTransform;
    }

    /**
     * Corresponds to the no-store cache control directive.
     * @return true if the no-store cache control directive will be included in the
     * response, false otherwise.
     * @see HTTP/1.1 section 14.9.2
     */
    public boolean isNoStore() {
        return noStore;
    }

    /**
     * Corresponds to the no-store cache control directive.
     * @param noStore true if the no-store cache control directive should be included in the
     * response, false otherwise.
     * @see HTTP/1.1 section 14.9.2
     */
    public void setNoStore(boolean noStore) {
        this.noStore = noStore;
    }

    /**
     * Corresponds to a set of extension cache control directives.
     * @return a mutable map of cache control extension names and their values.
     * If a key has a null value, it will appear as a bare directive. If a key has
     * a value that contains no whitespace then the directive will appear as
     * a simple name=value pair. If a key has a value that contains whitespace 
     * then the directive will appear as a quoted name="value" pair.
     * @see HTTP/1.1 section 14.9.6
     */
    public Map getCacheExtension() {
        if (cacheExtension == null)
            cacheExtension = new HashMap();
        return cacheExtension;
    }
}