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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.flink.optimizer.postpass;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.flink.types.Key;

/**
 * Class encapsulating a schema map (int column position -> column type) and a reference counter.
 */
public class SparseKeySchema extends AbstractSchema>> {
	
	private final Map>> schema;
	
	
	public SparseKeySchema() {
		this.schema = new HashMap>>();
	}

	// --------------------------------------------------------------------------------------------
	
	@Override
	public void addType(int key, Class> type) throws ConflictingFieldTypeInfoException  {
		Class> previous = this.schema.put(key, type);
		if (previous != null && previous != type) {
			throw new ConflictingFieldTypeInfoException(key, previous, type);
		}
	}
	
	@Override
	public Class> getType(int field) {
		return this.schema.get(field);
	}
	
	@Override
	public Iterator>>> iterator() {
		return this.schema.entrySet().iterator();
	}
	
	public int getNumTypes() {
		return this.schema.size();
	}

	// --------------------------------------------------------------------------------------------

	@Override
	public int hashCode() {
		return this.schema.hashCode() ^ getNumConnectionsThatContributed();
	}

	@Override
	public boolean equals(Object obj) {
		if (obj instanceof SparseKeySchema) {
			SparseKeySchema other = (SparseKeySchema) obj;
			return this.schema.equals(other.schema) && 
					this.getNumConnectionsThatContributed() == other.getNumConnectionsThatContributed();
		} else {
			return false;
		}
	}
	
	@Override
	public String toString() {
		return "<" + getNumConnectionsThatContributed() + "> : " + this.schema.toString();
	}
}