<?xml version="1.0" encoding="UTF-8"?><!--
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>org.apache.shindig</groupId>
    <artifactId>shindig-project</artifactId>
    <version>2.5.0</version>
    <relativePath>../../pom.xml</relativePath>
  </parent>

  <artifactId>shindig-gadgets</artifactId>
  <version>2.5.0</version>
  <packaging>jar</packaging>

  <name>Apache Shindig Gadget Renderer</name>
  <description>Renders gadgets, provides the gadget metadata service, and serves
    all javascript required by the OpenSocial specification.</description>

  <scm>
    <connection>scm:svn:http://svn.apache.org/repos/asf/shindig/tags/shindig-project-2.5.0/java/gadgets</connection>
    <developerConnection>scm:svn:https://svn.apache.org/repos/asf/shindig/tags/shindig-project-2.5.0/java/gadgets</developerConnection>
    <url>http://svn.apache.org/viewvc/shindig/tags/shindig-project-2.5.0/java/gadgets</url>
  </scm>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins </groupId>
        <artifactId>maven-eclipse-plugin</artifactId>
      </plugin>
    </plugins>
    <resources>
      <resource>
        <targetPath>config</targetPath>
        <directory>${basedir}/../../config</directory>
        <includes>
          <include>oauth.json</include>
          <include>oauth2.json</include>
          <include>OSML_library.xml</include>
          <include>gadget-admin.json</include>
        </includes>
      </resource>

      <resource>
        <directory>src/main/resources</directory>
        <filtering>false</filtering>
      </resource>
      <resource>
        <!-- TODO: eliminate this inclusion -->
        <!-- this is relative to the pom.xml directory -->
        <directory>${basedir}/../../content/</directory>
        <targetPath>files</targetPath>
        <includes>
          <include>xpc.swf</include>
          <include>container/rpc_relay.html</include>
          <include>container/cookiebaseduserprefstore.js</include>
        </includes>
      </resource>
    </resources>
    <pluginManagement>
    	<plugins>
    		<!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
    		<plugin>
    			<groupId>org.eclipse.m2e</groupId>
    			<artifactId>lifecycle-mapping</artifactId>
    			<version>1.0.0</version>
    			<configuration>
    				<lifecycleMappingMetadata>
    					<pluginExecutions>
    						<pluginExecution>
    							<pluginExecutionFilter>
    								<groupId>org.codehaus.mojo</groupId>
    								<artifactId>
    									build-helper-maven-plugin
    								</artifactId>
    								<versionRange>[1.7,)</versionRange>
    								<goals>
    									<goal>add-source</goal>
    								</goals>
    							</pluginExecutionFilter>
    							<action>
    								<ignore />
    							</action>
    						</pluginExecution>
    					</pluginExecutions>
    				</lifecycleMappingMetadata>
    			</configuration>
    		</plugin>
    	</plugins>
    </pluginManagement>
  </build>

  <profiles>
    <profile>
      <id>reporting</id>
      <reporting>
        <plugins>
          <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>clirr-maven-plugin</artifactId>
            <configuration>
              <comparisonVersion>${shindig.api.previous&gt;}</comparisonVersion>
            </configuration>
            <version>2.2.3</version>
          </plugin>
        </plugins>
      </reporting>
    </profile>
  </profiles>

  <dependencies>
    <!-- project dependencies -->
    <dependency>
      <groupId>org.apache.shindig</groupId>
      <artifactId>shindig-common</artifactId>
      <classifier>${shindig.jdk.classifier}</classifier>
    </dependency>
    <dependency>
      <groupId>org.apache.shindig</groupId>
      <artifactId>shindig-common</artifactId>
      <type>test-jar</type>
      <scope>test</scope>
    </dependency>

    <!--
      external dependencies
      where the depedency version is defined in dependency Management,
      there is no need for the version, and it should not be put in
      so we have a single place to change the version
    -->
    <dependency>
      <groupId>org.json</groupId>
      <artifactId>json</artifactId>
    </dependency>
    <dependency>
      <groupId>diff_match_patch</groupId>
      <artifactId>diff_match_patch</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>caja</groupId>
      <artifactId>caja</artifactId>
    </dependency>
    <dependency>
      <groupId>caja</groupId>
      <artifactId>htmlparser</artifactId>
    </dependency>
    <dependency>
      <groupId>net.oauth.core</groupId>
      <artifactId>oauth</artifactId>
    </dependency>
    <dependency>
      <groupId>net.oauth.core</groupId>
      <artifactId>oauth-httpclient4</artifactId>
    </dependency>
    <dependency>
      <groupId>net.oauth.core</groupId>
      <artifactId>oauth-provider</artifactId>
    </dependency>
    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
    </dependency>
    <dependency>
      <groupId>com.google.inject</groupId>
      <artifactId>guice</artifactId>
    </dependency>
    <dependency>
      <groupId>com.google.inject.extensions</groupId>
      <artifactId>guice-multibindings</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
    </dependency>
    <dependency>
      <groupId>rome</groupId>
      <artifactId>rome</artifactId>
    </dependency>
    <dependency>
      <groupId>rome</groupId>
      <artifactId>modules</artifactId>
    </dependency>
    <dependency>
      <groupId>com.ibm.icu</groupId>
      <artifactId>icu4j</artifactId>
    </dependency>
    <dependency>
      <groupId>net.sourceforge.nekohtml</groupId>
      <artifactId>nekohtml</artifactId>
    </dependency>
    <dependency>
      <groupId>xerces</groupId>
      <artifactId>xercesImpl</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.sanselan</groupId>
      <artifactId>sanselan</artifactId>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
    </dependency>
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
    </dependency>
    <dependency>
      <groupId>xml-apis</groupId>
      <artifactId>xml-apis</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.tomcat</groupId>
        <artifactId>el-api</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.httpcomponents</groupId>
      <artifactId>httpclient</artifactId>
    </dependency>
    <dependency>
      <groupId>com.google.javascript</groupId>
      <artifactId>closure-compiler</artifactId>
      <version>v20130227</version>
    </dependency>

    <!-- test -->
    <dependency>
      <groupId>org.mortbay.jetty</groupId>
      <artifactId>jetty</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>
