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refactor: introduce ResultHandlerBase to factor out common error proc…
…essing logic
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pgjdbc/src/main/java/org/postgresql/core/ResultHandlerBase.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /*------------------------------------------------------------------------- | ||
| * | ||
| * Copyright (c) 2016-2016, PostgreSQL Global Development Group | ||
| * | ||
| * | ||
| *------------------------------------------------------------------------- | ||
| */ | ||
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| package org.postgresql.core; | ||
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| import java.sql.SQLException; | ||
| import java.sql.SQLWarning; | ||
| import java.util.List; | ||
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| /** | ||
| * Empty implementation of {@link ResultHandler} interface. | ||
| * {@link SQLException#setNextException(SQLException)} has {@code O(N)} complexity, | ||
| * so this class tracks the last exception object to speedup {@code setNextException}. | ||
| */ | ||
| public class ResultHandlerBase implements ResultHandler { | ||
| // Last exception is tracked to avoid O(N) SQLException#setNextException just in case there | ||
| // will be lots of exceptions (e.g. all batch rows fail with constraint violation or so) | ||
| private SQLException firstException; | ||
| private SQLException lastException; | ||
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| private SQLWarning firstWarning; | ||
| private SQLWarning lastWarning; | ||
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| @Override | ||
| public void handleResultRows(Query fromQuery, Field[] fields, List<byte[][]> tuples, | ||
| ResultCursor cursor) { | ||
| } | ||
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| @Override | ||
| public void handleCommandStatus(String status, int updateCount, long insertOID) { | ||
| } | ||
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| @Override | ||
| public void secureProgress() { | ||
| } | ||
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| @Override | ||
| public void handleWarning(SQLWarning warning) { | ||
| if (firstWarning == null) { | ||
| firstWarning = lastWarning = warning; | ||
| return; | ||
| } | ||
| lastWarning.setNextException(warning); | ||
| lastWarning = warning; | ||
| } | ||
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| @Override | ||
| public void handleError(SQLException error) { | ||
| if (firstException == null) { | ||
| firstException = lastException = error; | ||
| return; | ||
| } | ||
| lastException.setNextException(error); | ||
| lastException = error; | ||
| } | ||
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| @Override | ||
| public void handleCompletion() throws SQLException { | ||
| if (firstException != null) { | ||
| throw firstException; | ||
| } | ||
| } | ||
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| @Override | ||
| public SQLException getException() { | ||
| return firstException; | ||
| } | ||
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| @Override | ||
| public SQLWarning getWarning() { | ||
| return firstWarning; | ||
| } | ||
| } |
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