# PolicyImpl.java

    /*
     * Copyright (c) 2008, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
     *
     * Licensed 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.
     */
    package org.wso2.carbon.governance.api.policies.dataobjects;

    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.wso2.carbon.governance.api.common.dataobjects.GovernanceArtifact;
    import org.wso2.carbon.governance.api.common.dataobjects.GovernanceArtifactImpl;
    import org.wso2.carbon.governance.api.exception.GovernanceException;
    import org.wso2.carbon.registry.core.Registry;
    import org.wso2.carbon.registry.core.Resource;
    import org.wso2.carbon.registry.core.exceptions.RegistryException;
    import org.wso2.carbon.registry.core.utils.RegistryUtils;

    import javax.xml.namespace.QName;
    import java.util.List;
    import java.util.Properties;
    import java.util.Set;

    /**
     * This represents a policy artifact stored on the Registry. Policy artifacts are created as a
     * result of importing or uploading a policy.
     */
    public class PolicyImpl extends GovernanceArtifactImpl implements Policy {

        private static final Log log = LogFactory.getLog(PolicyImpl.class);

        private String name;
        private String url;
        private String policyContent;

        /**
         * Constructor accepting resource path, identifier and a registry instance.
         * This constructor should be used only when the policy already saved in the registry.
         *
         * @param path     the resource path.
         * @param id       the resource identifier.
         * @param registry the registry instance.
         *
         * @throws GovernanceException if the construction fails.
         */
        public PolicyImpl(String id, Registry registry) throws GovernanceException {
            super(id);
            associateRegistry(registry);
            loadPolicyDetails();
        }

        /**
         * Constructor accepting resource identifier and the policy URL.
         *
         * @param id  the resource identifier.
         * @param url the policy URL.
         */
        public PolicyImpl(String id, String url) {
            super(id);
            this.url = url;
        }

        public QName getQName() {
            if (name == null) {
                return null;
            }
            // for the policy QName there are no
            return new QName(name);
        }

        /**
         * Method to obtain the policy element of this policy artifact.
         *
         * @return the policy element.
         */
        @Override
        public String getPolicyContent() {
            return policyContent;
        }

        /**
         * Method to set the policy element of this policy artifact.
         *
         * @param policyContent the policy element.
         */
        @Override
        @SuppressWarnings("unused")
        public void setPolicyContent(String policyContent) {
            this.policyContent = policyContent;
        }

        /**
         * Method to obtain the policy URL.
         *
         * @return the policy URL.
         */
        public String getUrl() {
            return url;
        }

        /**
         * Method to set the name of the policy.
         *
         * @param name the name of the policy.
         */
        public void setName(String name) {
            this.name = name;
        }

        /**
         * Method to load the policy details into this artifact.
         *
         * @throws GovernanceException if the operation failed.
         */
        public void loadPolicyDetails() throws GovernanceException {
            checkRegistryResourceAssociation();
            Registry registry = getAssociatedRegistry();
            String path = getPath();
            String id = getId();
            Resource resource;
            try {
                resource = registry.get(path);
                byte[] content = (byte[]) resource.getContent();
                policyContent = RegistryUtils.decodeBytes(content);

            } catch (RegistryException e) {
                String msg =
                        "Error in getting the content for the artifact. artifact id: " + id + ", " +
                                "path: " + path + ".";
                log.error(msg);
                throw new GovernanceException(msg, e);
            }
            // get the target namespace.

            name = RegistryUtils.getResourceName(path);

            // and then iterate all the properties and add.
            Properties properties = resource.getProperties();
            if (properties != null) {
                Set keySet = properties.keySet();
                if (keySet != null) {
                    for (Object keyObj : keySet) {
                        String key = (String) keyObj;
    //                    if (key.equals(GovernanceConstants.ARTIFACT_ID_PROP_KEY)) {
                            // it is not a property.
    //                        continue;
    //                    }
                        List values = (List) properties.get(key);
                        if (values != null) {
                            for (Object valueObj : values) {
                                String value = (String) valueObj;
                                addAttribute(key, value);
                            }
                        }
                    }
                }
            }
        }

        /**
         * Method to set the qualified name of this service artifact.
         *
         * @param qName the qualified name.
         *
         * @throws GovernanceException if the operation failed.
         */
        public void setQName(QName qName) throws GovernanceException {
            // the path will be synced with the qualified name
            this.name = qName.getLocalPart();
        }
    }