/*
 * 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.
 */

/*
 * UriInfo.java
 *
 * Created on April 13, 2007, 2:55 PM
 *
 */

package javax.ws.rs.core;

import java.net.URI;
import java.util.List;

/**
 * An injectable interface that provides access to application and request 
 * URI information. Relative URIs are relative to the base URI of the
 * application, see {@link #getBaseUri}.
 * 
 * <p>All methods throw <code>java.lang.IllegalStateException</code>
 * if called outside the scope of a request (e.g. from a provider constructor).</p>
 * 
 * @see Context
 */
public interface UriInfo {
    
    /**
     * Get the path of the current request relative to the base URI as
     * a string. All sequences of escaped octets are decoded, equivalent to
     * <code>getPath(true)</code>.
     * 
     * @return the relative URI path
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public String getPath();
    
    /**
     * Get the path of the current request relative to the base URI as
     * a string.
     *
     * @param decode controls whether sequences of escaped octets are decoded
     * (true) or not (false).
     * @return the relative URI path
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public String getPath(boolean decode);

    /**
     * Get the path of the current request relative to the base URI as a 
     * list of {@link PathSegment}. This method is useful when the
     * path needs to be parsed, particularly when matrix parameters may be
     * present in the path. All sequences of escaped octets in path segments
     * and matrix parameter values are decoded,
     * equivalent to <code>getPathSegments(true)</code>.
     * @return an unmodifiable list of {@link PathSegment}. The matrix parameter
     * map of each path segment is also unmodifiable.
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     * @see PathSegment
     * @see <a href="http://www.w3.org/DesignIssues/MatrixURIs.html">Matrix URIs</a>
     */
    public List<PathSegment> getPathSegments();
    
    /**
     * Get the path of the current request relative to the base URI as a 
     * list of {@link PathSegment}. This method is useful when the
     * path needs to be parsed, particularly when matrix parameters may be
     * present in the path.
     * @param decode controls whether sequences of escaped octets in path segments
     * and matrix parameter values are decoded (true) or not (false).
     * @return an unmodifiable list of {@link PathSegment}. The matrix parameter
     * map of each path segment is also unmodifiable.
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     * @see PathSegment
     * @see <a href="http://www.w3.org/DesignIssues/MatrixURIs.html">Matrix URIs</a>
     */
    public List<PathSegment> getPathSegments(boolean decode);
    
    /**
     * Get the absolute request URI including any query parameters.
     * @return the absolute request URI
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public URI getRequestUri();
    
    /**
     * Get the absolute request URI in the form of a UriBuilder.
     * @return a UriBuilder initialized with the absolute request URI
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public UriBuilder getRequestUriBuilder();
    
    /**
     * Get the absolute path of the request. This includes everything preceding
     * the path (host, port etc) but excludes query parameters.
     * This is a shortcut for
     * <code>uriInfo.getBase().resolve(uriInfo.getPath()).</code>
     * @return the absolute path of the request
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public URI getAbsolutePath();
    
    /**
     * Get the absolute path of the request in the form of a UriBuilder.
     * This includes everything preceding the path (host, port etc) but excludes
     * query parameters.
     * @return a UriBuilder initialized with the absolute path of the request
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public UriBuilder getAbsolutePathBuilder();

    /**
     * Get the base URI of the application. URIs of root resource classes
     * are all relative to this base URI.
     * @return the base URI of the application
     */
    public URI getBaseUri();
    
    /**
     * Get the base URI of the application in the form of a UriBuilder.
     * @return a UriBuilder initialized with the base URI of the application.
     */
    public UriBuilder getBaseUriBuilder();
    
    /**
     * Get the values of any embedded URI template parameters.
     * All sequences of escaped octets are decoded,
     * equivalent to <code>getPathParameters(true)</code>.
     * @return an unmodifiable map of parameter names and values
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     * @see javax.ws.rs.Path
     * @see javax.ws.rs.PathParam
     */
    public MultivaluedMap<String, String> getPathParameters();
    
    /**
     * Get the values of any embedded URI template parameters.
     * 
     * @param decode controls whether sequences of escaped octets are decoded
     * (true) or not (false).
     * @return an unmodifiable map of parameter names and values
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     * @see javax.ws.rs.Path
     * @see javax.ws.rs.PathParam
     */
    public MultivaluedMap<String, String> getPathParameters(boolean decode);
    
    /**
     * Get the URI query parameters of the current request.
     * The map keys are the names of the query parameters with any
     * escaped characters decoded.
     * All sequences of escaped octets in parameter values are decoded,
     * equivalent to <code>getQueryParameters(true)</code>.
     * @return an unmodifiable map of query parameter names and values
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public MultivaluedMap<String, String> getQueryParameters();
    
    /**
     * Get the URI query parameters of the current request.
     * The map keys are the names of the query parameters with any
     * escaped characters decoded.
     * @param decode controls whether sequences of escaped octets in parameter
     * values are decoded (true) or not (false).
     * @return an unmodifiable map of query parameter names and values
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public MultivaluedMap<String, String> getQueryParameters(boolean decode);
    
    /**
     * Get a read-only list of URIs for matched resources. Each entry is a 
     * relative URI that matched a resource class, a 
     * sub-resource method or a sub-resource locator. All sequences of escaped 
     * octets are decoded, equivalent to {@code getMatchedURIs(true)}.
     * Entries do not include query parameters but do include matrix parameters
     * if present in the request URI. Entries are ordered in reverse request 
     * URI matching order, with the current resource URI first.  E.g. given the
     * following resource classes:
     * 
     * <pre>&#064;Path("foo")
     *public class FooResource {
     *  &#064;GET
     *  public String getFoo() {...}
     * 
     *  &#064;Path("bar")
     *  public BarResource getBarResource() {...}
     *}
     * 
     *public class BarResource {
     *  &#064;GET
     *  public String getBar() {...}
     *}
     * </pre>
     * 
     * <p>The values returned by this method based on request uri and where 
     * the method is called from are:</p>
     * 
     * <table border="1">
     * <tr>
     *   <th>Request</th>
     *   <th>Called from</th>
     *   <th>Value(s)</th>
     * </tr>
     * <tr>
     *   <td>GET /foo</td>
     *   <td>FooResource.getFoo</td>
     *   <td>foo</td>
     * </tr>
     * <tr>
     *   <td>GET /foo/bar</td>
     *   <td>FooResource.getBarResource</td>
     *   <td>foo/bar, foo</td>
     * </tr>
     * <tr>
     *   <td>GET /foo/bar</td>
     *   <td>BarResource.getBar</td>
     *   <td>foo/bar, foo</td>
     * </tr>
     * </table>
     * 
     * 
     * @return a read-only list of URI paths for matched resources.
     */
    public List<String> getMatchedURIs();
    
    /**
     * Get a read-only list of URIs for matched resources. Each entry is a 
     * relative URI that matched a resource class, a sub-resource 
     * method or a sub-resource locator. Entries do not include query
     * parameters but do include matrix parameters if present in the request URI.
     * Entries are ordered in reverse request URI matching order, with the 
     * current resource URI first. See {@link #getMatchedURIs()} for an
     * example.
     * 
     * @param decode controls whether sequences of escaped octets are decoded
     * (true) or not (false).
     * @return a read-only list of URI paths for matched resources.
     */
    public List<String> getMatchedURIs(boolean decode);
    
    /**
     * Get a read-only list of the currently matched resource class instances.
     * Each entry is a resource class instance that matched the request URI 
     * either directly or via a sub-resource method or a sub-resource locator. 
     * Entries are ordered according to reverse request URI matching order,
     * with the current resource first. E.g. given the following resource 
     * classes:
     * 
     * <pre>&#064;Path("foo")
     *public class FooResource {
     *  &#064;GET
     *  public String getFoo() {...}
     * 
     *  &#064;Path("bar")
     *  public BarResource getBarResource() {...}
     *}
     * 
     *public class BarResource {
     *  &#064;GET
     *  public String getBar() {...}
     *}
     * </pre>
     * 
     * <p>The values returned by this method based on request uri and where 
     * the method is called from are:</p>
     * 
     * <table border="1">
     * <tr>
     *   <th>Request</th>
     *   <th>Called from</th>
     *   <th>Value(s)</th>
     * </tr>
     * <tr>
     *   <td>GET /foo</td>
     *   <td>FooResource.getFoo</td>
     *   <td>FooResource</td>
     * </tr>
     * <tr>
     *   <td>GET /foo/bar</td>
     *   <td>FooResource.getBarResource</td>
     *   <td>FooResource</td>
     * </tr>
     * <tr>
     *   <td>GET /foo/bar</td>
     *   <td>BarResource.getBar</td>
     *   <td>BarResource, FooResource</td>
     * </tr>
     * </table>
     * 
     * @return a read-only list of matched resource class instances.
     */
    public List<Object> getMatchedResources();
}