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/*****************************************************************
 *   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.cayenne.modeler.graph;

import java.io.Serializable;

import org.apache.cayenne.map.Attribute;
import org.apache.cayenne.map.Entity;

/**
 * Abstract class to describe entity's cell 
 */
abstract class EntityCellMetadata implements Serializable {
    GraphBuilder builder;
    
    String entityName;
    String label;
    
    EntityCellMetadata() {
    }
    
    EntityCellMetadata(GraphBuilder builder, String entityName) {
        this.builder = builder;
        this.entityName = entityName;
        
        rebuildLabel();
    }
        
    /**
     * Resolves entity
     */
    public abstract Entity fetchEntity();
    
    final void rebuildLabel() {
        label = createLabel();
    }
    
    public String toString() {
        if (label == null) {
            rebuildLabel();
        }
        
        return label;
    }
    
    /**
     * Creates label for this cell
     */
    String createLabel() {
        Entity entity = fetchEntity();
        StringBuilder label = new StringBuilder("").
                append(entity.getName()).append("");
        for (Attribute attr : entity.getAttributes()) {
            if (isPrimary(attr)) {
                label.append("
").append(attr.getName()).append("");
            }
        }
        for (Attribute attr : entity.getAttributes()) {
            if (!isPrimary(attr)) {
                label.append("
").append(attr.getName());
            }
        }
        return label.toString();
    }
    
    /**
     * Returns whether attribute is "primary" and should therefore be written in italic
     */
    protected abstract boolean isPrimary(Attribute attr);
}