ShowSchemaQuery.java

package org.wonderdb.query.parse;

/*******************************************************************************
 *    Copyright 2013 Vilas Athavale
 *
 *    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.
 *******************************************************************************/

import java.util.List;

import org.wonderdb.expression.AndExpression;
import org.wonderdb.schema.CollectionMetadata;
import org.wonderdb.schema.SchemaMetadata;


public class ShowSchemaQuery extends BaseDBQuery {
	
	public ShowSchemaQuery(String q){
		super(q, null, -1, null);
	}
	
	
	public String execute() {
		List<CollectionMetadata> colList = SchemaMetadata.getInstance().getCollections();
		if (colList == null) {
			return "\n";
		}
		StringBuilder builder = new StringBuilder();
		for (CollectionMetadata meta : colList) {
			builder.append("-------------------------------------------------------------------------\n");
			ShowTableQuery q = new ShowTableQuery(getQueryString(), meta.getCollectionName());
			builder.append("Collection Name: ").append(meta.getCollectionName()).append("\n");
			builder.append(q.execute());
			builder.append("\n");
		}
		return builder.toString();
	}


	@Override
	public AndExpression getExpression() {
		return null;
	}
}