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A thundr module enabling thundr for use on GAE (Google App Engine)
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/*
 * This file is a component of thundr, a software library from 3wks.
 * Read more: http://3wks.github.io/thundr/
 * Copyright (C) 2015 3wks, 
 *
 * 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.threewks.thundr.search;

import java.util.Collection;

import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;

/**
 * Represents a component of a {@link Search}. There are three types of query component,
 * raw queries (just a string passed down to the search implementation),
 * field queries (a query for a specific value on a specific field, like 'field-name' greater than 10)
 * and field collection queries (like 'field-name' in value1, value2, value3)
 * 
 * There is a static factory method for each type of use case.
 * {@link #forRawQuery(CharSequence)}
 * {@link #forFieldQuery(String, Is, Object)}
 * {@link #forCollection(String, Collection)}
 */
public class QueryComponent {
	private String fieldOrQuery;
	private Is is;
	private Object value;

	/**
	 * Create a {@link QueryComponent} for a raw query string.
	 * 
	 * @param query
	 * @return
	 */
	public static QueryComponent forRawQuery(CharSequence query) {
		return new QueryComponent(query.toString(), null, null);
	}

	/**
	 * Create a {@link QueryComponent} for matching a particular field against a discrete set of values
	 * 
	 * @param field
	 * @param values
	 * @return
	 */
	public static  QueryComponent forCollection(String field, Collection values) {
		return new QueryComponent(field, null, values);
	}

	/**
	 * Create a {@link QueryComponent} for querying on a particular field using the given relation ({@link Is}) with the given value.
	 * 
	 * @param field
	 * @param is
	 * @param value
	 * @return
	 */

	public static  QueryComponent forFieldQuery(String field, Is is, V value) {
		return new QueryComponent(field, is, value);
	}

	private QueryComponent(String fieldOrQuery, Is is, Object value) {
		super();
		this.fieldOrQuery = fieldOrQuery;
		this.is = is;
		this.value = value;
	}

	/**
	 * Get the field for a field query, or null if not a field query
	 * 
	 * @return
	 * @see #isFieldedQuery()
	 */
	public String getField() {
		return value == null ? null : fieldOrQuery;
	}

	/**
	 * Get the query for a non-field query, or null if is a field query.
	 * 
	 * @return
	 * @see #isFieldedQuery()
	 */
	public String getQuery() {
		return value == null ? fieldOrQuery : null;
	}

	/**
	 * Get the {@link Is} for a fielded query
	 * 
	 * @return
	 */
	public Is getIs() {
		return is;
	}

	/**
	 * Get the value for a fielded query, returns null if a collection query
	 * 
	 * @return
	 * @see #isCollectionQuery()
	 */
	public Object getValue() {
		return isCollectionQuery() ? null : value;
	}

	/**
	 * Return true if this is a fielded query
	 * 
	 * @return
	 */
	public boolean isFieldedQuery() {
		return value != null;
	}

	/**
	 * Return true if this is a collection query
	 * 
	 * @return
	 */
	public boolean isCollectionQuery() {
		return value instanceof Collection;
	}

	/**
	 * Return the collection for a collection query, or null if not a colleciton query
	 * 
	 * @return
	 * @see #isCollectionQuery()
	 */
	@SuppressWarnings("unchecked")
	public Collection