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- /*
- Copyright (c) 2010 James Ahlborn
-
- 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.healthmarketscience.jackcess.util;
-
- import java.io.IOException;
- import java.util.Arrays;
- import java.util.Objects;
-
- import com.healthmarketscience.jackcess.DataType;
- import com.healthmarketscience.jackcess.Table;
- import com.healthmarketscience.jackcess.impl.ColumnImpl;
- import com.healthmarketscience.jackcess.impl.DatabaseImpl;
-
- /**
- * Simple concrete implementation of ColumnMatcher which tests for equality.
- * If initial comparison fails, attempts to coerce the values to a common type
- * for comparison.
- *
- * @author James Ahlborn
- * @usage _general_class_
- */
- public class SimpleColumnMatcher implements ColumnMatcher {
-
- public static final SimpleColumnMatcher INSTANCE = new SimpleColumnMatcher();
-
- @Override
- public boolean matches(Table table, String columnName, Object value1,
- Object value2)
- {
- if(equals(value1, value2)) {
- return true;
- }
-
- if((value1 != null) && (value2 != null) &&
- (value1.getClass() != value2.getClass())) {
-
- // the values aren't the same type, try coercing them to "internal"
- // values and try again
- DataType dataType = table.getColumn(columnName).getType();
- try {
- DatabaseImpl db = (DatabaseImpl)table.getDatabase();
- Object internalV1 = ColumnImpl.toInternalValue(dataType, value1, db);
- Object internalV2 = ColumnImpl.toInternalValue(dataType, value2, db);
-
- return equals(internalV1, internalV2);
- } catch(IOException e) {
- // ignored, just go with the original result
- }
- }
- return false;
- }
-
- /**
- * Returns {@code true} if the two objects are equal, handling {@code null}
- * and objects of type {@code byte[]}.
- */
- private static boolean equals(Object o1, Object o2)
- {
- return (Objects.equals(o1, o2) ||
- ((o1 instanceof byte[]) && (o2 instanceof byte[]) &&
- Arrays.equals((byte[])o1, (byte[])o2)));
- }
-
- }
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