001/*
002 * Copyright 2002-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.jdbc.core.namedparam;
018
019import org.springframework.lang.Nullable;
020
021/**
022 * A simple empty implementation of the {@link SqlParameterSource} interface.
023 *
024 * @author Juergen Hoeller
025 * @since 3.2.2
026 */
027public class EmptySqlParameterSource implements SqlParameterSource {
028
029        /**
030         * A shared instance of {@link EmptySqlParameterSource}.
031         */
032        public static final EmptySqlParameterSource INSTANCE = new EmptySqlParameterSource();
033
034
035        @Override
036        public boolean hasValue(String paramName) {
037                return false;
038        }
039
040        @Override
041        @Nullable
042        public Object getValue(String paramName) throws IllegalArgumentException {
043                throw new IllegalArgumentException("This SqlParameterSource is empty");
044        }
045
046        @Override
047        public int getSqlType(String paramName) {
048                return TYPE_UNKNOWN;
049        }
050
051        @Override
052        @Nullable
053        public String getTypeName(String paramName) {
054                return null;
055        }
056
057        @Override
058        @Nullable
059        public String[] getParameterNames() {
060                return null;
061        }
062
063}