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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 com.hazelcast.org.apache.calcite.util.mapping;

import java.util.Iterator;

/**
 * A Mapping is a relationship between a source domain to target
 * domain of integers.
 *
 * 

This interface represents the most general possible mapping. Depending on * the {@link MappingType} of a particular mapping, some of the operations may * not be applicable. If you call the method, you will receive a runtime error. * For instance: * *

    *
  • If a target has more than one source, then the method * {@link #getSource(int)} will throw * {@link Mappings.TooManyElementsException}. *
  • If a source has no targets, then the method {@link #getTarget} will throw * {@link Mappings.NoElementException}. *
*/ public interface Mapping extends Mappings.FunctionMapping, Mappings.SourceMapping, Mappings.TargetMapping, Iterable { //~ Methods ---------------------------------------------------------------- /** * Returns an iterator over the elements in this mapping. * *

This method is optional; implementations may throw * {@link UnsupportedOperationException}. */ @Override Iterator iterator(); /** * Returns the number of sources. Valid sources will be in the range 0 .. * sourceCount. */ @Override int getSourceCount(); /** * Returns the number of targets. Valid targets will be in the range 0 .. * targetCount. */ @Override int getTargetCount(); @Override MappingType getMappingType(); /** * Returns whether this mapping is the identity. */ @Override boolean isIdentity(); /** * Removes all elements in the mapping. */ void clear(); /** * Returns the number of elements in the mapping. */ @Override int size(); }





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