core/src/main/java/org/apache/sling/testing/mock/sling/loader/LoaderContentHandler.java

/*
 * 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.
 */
package org.apache.sling.testing.mock.sling.loader;

import javax.jcr.Node;
import java.io.ByteArrayInputStream;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.apache.jackrabbit.JcrConstants;
import org.apache.sling.api.resource.ModifiableValueMap;
import org.apache.sling.api.resource.PersistenceException;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.resource.ResourceUtil;
import org.apache.sling.contentparser.api.ContentHandler;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

final class LoaderContentHandler implements ContentHandler {

    private static final String JCR_DATA_PLACEHOLDER = ":jcr:data";
    private static final String JCR_REFERENCE_PLACEHOLDER = ":jcr:content";

    private final @NotNull String rootPath;
    private final @NotNull ResourceResolver resourceResolver;
    
    public LoaderContentHandler(@NotNull String rootPath, @NotNull ResourceResolver resourceResolver) {
        this.rootPath = rootPath;
        this.resourceResolver = resourceResolver;
    }

    @Override
    public void resource(String path, Map<String, Object> properties) {
        String fullPath = rootPath;
        if (!StringUtils.equals(path, "/")) {
            fullPath += path;
        }
        String parentPath = ResourceUtil.getParent(fullPath);
        String name = ResourceUtil.getName(fullPath);
        
        if (parentPath == null) {
            throw new IllegalArgumentException("Path has no parent: " + fullPath);
        }
        
        Resource parentResource = resourceResolver.getResource(parentPath);
        if (parentResource == null) {
            throw new RuntimeException("Parent resource '" + parentPath + "' not found.");
        }
        try {
            createResource(parentResource, name, properties);
        } 
        catch (PersistenceException ex) {
            throw new RuntimeException("Unable to create resource at '" + fullPath + "'.", ex);
        }
    }

    private Resource createResource(@NotNull Resource parentResource, @NotNull String childName, @Nullable Map<String,Object> content) throws PersistenceException {
        
        // collect all properties first
        boolean hasJcrData = false;
        String referencedNodePath = null;
        Map<String, Object> props = new HashMap<String, Object>();
        if (content != null) {
            for (Map.Entry<String,Object> entry : content.entrySet()) {
                final String name = entry.getKey();
                if (StringUtils.equals(name, JCR_DATA_PLACEHOLDER)) {
                    hasJcrData = true;
                }
                else if (StringUtils.equals(name, JCR_REFERENCE_PLACEHOLDER)) {
                    referencedNodePath = (String) entry.getValue();
                }
                else {
                    props.put(name, entry.getValue());
                }
            }
        }
        
        // create resource
        Resource resource = resourceResolver.create(parentResource, childName, props);

        ModifiableValueMap valueMap = resource.adaptTo(ModifiableValueMap.class);
        if (valueMap != null) {
            if (hasJcrData) {
                // we cannot import binary data here - but to avoid complaints by JCR we create it with empty binary data
                valueMap.put(JcrConstants.JCR_DATA, new ByteArrayInputStream(new byte[0]));
            } else if (StringUtils.isNotBlank(referencedNodePath)) {
                // target reference has to be specified relative to linking node, as tests may apply a dynamic root directory
                Resource referencedNodeResource = resourceResolver.getResource(resource.getPath() + "/" + referencedNodePath);
                if (referencedNodeResource != null) {
                    valueMap.put(JcrConstants.JCR_CONTENT, referencedNodeResource.adaptTo(Node.class));
                }
            }
        }

        return resource;
    }

}