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Entity Module

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/*
 * Copyright 2014 the original author or authors
 *
 * 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 com.foreach.across.modules.entity.query;

import org.apache.commons.lang3.StringUtils;
import org.springframework.util.Assert;

/**
 * Different operand types that an {@link EntityQueryCondition} supports.
 *
 * @author Arne Vandamme
 */
public enum EntityQueryOps
{
	AND( new OpsWriter()
	{
		@Override
		public String toString( String propertyName, Object... arguments ) {
			Assert.notNull( arguments );
			return "(" + StringUtils.join( arguments, " and " ) + ")";
		}
	} ),

	OR( new OpsWriter()
	{
		@Override
		public String toString( String propertyName, Object... arguments ) {
			Assert.notNull( arguments );
			return "(" + StringUtils.join( arguments, " or " ) + ")";
		}
	} ),

	EQ( new OpsWriter()
	{
		@Override
		public String toString( String propertyName, Object... arguments ) {
			return propertyName + " = " + objectAsString( arguments[0] );
		}
	} ),

	NEQ( new OpsWriter()
	{
		@Override
		public String toString( String propertyName, Object... arguments ) {
			return propertyName + " != " + objectAsString( arguments[0] );
		}
	} ),

	CONTAINS( new OpsWriter()
	{
		@Override
		public String toString( String propertyName, Object... arguments ) {
			return propertyName + " contains " + objectAsString( arguments[0] );
		}
	} );

	private static interface OpsWriter
	{
		String toString( String propertyName, Object... arguments );
	}

	private static String objectAsString( Object object ) {
		if ( object == null ) {
			return "NULL";
		}

		if ( object instanceof String ) {
			return "'" + object + "'";
		}

		return object.toString();
	}

	private final OpsWriter opsWriter;

	EntityQueryOps( OpsWriter opsWriter ) {
		this.opsWriter = opsWriter;
	}

	public String toString( String propertyName, Object... arguments ) {
		return opsWriter.toString( propertyName, arguments );
	}
}