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- /*
- Copyright (c) 2018 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.impl;
-
- import java.io.IOException;
-
- import com.healthmarketscience.jackcess.Column;
- import com.healthmarketscience.jackcess.util.ColumnValidator;
- import com.healthmarketscience.jackcess.util.SimpleColumnValidator;
-
- /**
- * Base class for ColumnValidator instances handling "internal" validation
- * functionality, which are wrappers around any "external" behavior.
- *
- * @author James Ahlborn
- */
- abstract class InternalColumnValidator implements ColumnValidator
- {
- private ColumnValidator _delegate;
-
- protected InternalColumnValidator(ColumnValidator delegate)
- {
- _delegate = delegate;
- }
-
- ColumnValidator getExternal() {
- ColumnValidator extValidator = _delegate;
- while(extValidator instanceof InternalColumnValidator) {
- extValidator = ((InternalColumnValidator)extValidator)._delegate;
- }
- return extValidator;
- }
-
- void setExternal(ColumnValidator extValidator) {
- InternalColumnValidator intValidator = this;
- while(intValidator._delegate instanceof InternalColumnValidator) {
- intValidator = (InternalColumnValidator)intValidator._delegate;
- }
- intValidator._delegate = extValidator;
- }
-
- @Override
- public final Object validate(Column col, Object val) throws IOException {
- val = _delegate.validate(col, val);
- return internalValidate(col, val);
- }
-
- @Override
- public String toString() {
- StringBuilder sb = new StringBuilder().append("{");
- if(_delegate instanceof InternalColumnValidator) {
- ((InternalColumnValidator)_delegate).appendToString(sb);
- } else if(_delegate != SimpleColumnValidator.INSTANCE) {
- sb.append("custom=").append(_delegate);
- }
- if(sb.length() > 1) {
- sb.append(";");
- }
- appendToString(sb);
- sb.append("}");
- return sb.toString();
- }
-
- protected abstract void appendToString(StringBuilder sb);
-
- protected abstract Object internalValidate(Column col, Object val)
- throws IOException;
- }
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