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Start making each
FormatterStep
roundtrip serializable. (#1945)
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87 changes: 87 additions & 0 deletions
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lib/src/main/java/com/diffplug/spotless/FormatterStepEqualityOnStateSerialization.java
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/* | ||
* Copyright 2016-2024 DiffPlug | ||
* | ||
* 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.diffplug.spotless; | ||
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import java.io.File; | ||
import java.io.Serializable; | ||
import java.util.Arrays; | ||
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import edu.umd.cs.findbugs.annotations.SuppressFBWarnings; | ||
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/** | ||
* Standard implementation of FormatterStep which cleanly enforces | ||
* separation of a lazily computed "state" object whose serialized form | ||
* is used as the basis for equality and hashCode, which is separate | ||
* from the serialized form of the step itself, which can include absolute paths | ||
* and such without interfering with buildcache keys. | ||
*/ | ||
@SuppressFBWarnings("SE_TRANSIENT_FIELD_NOT_RESTORED") | ||
abstract class FormatterStepEqualityOnStateSerialization<State extends Serializable> implements FormatterStep, Serializable { | ||
private static final long serialVersionUID = 1L; | ||
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protected abstract State stateSupplier() throws Exception; | ||
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protected abstract FormatterFunc stateToFormatter(State state) throws Exception; | ||
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private transient FormatterFunc formatter; | ||
private transient State stateInternal; | ||
private transient byte[] serializedStateInternal; | ||
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@Override | ||
public String format(String rawUnix, File file) throws Exception { | ||
if (formatter == null) { | ||
formatter = stateToFormatter(state()); | ||
} | ||
return formatter.apply(rawUnix, file); | ||
} | ||
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@Override | ||
public boolean equals(Object o) { | ||
if (o == null) { | ||
return false; | ||
} else if (getClass() != o.getClass()) { | ||
return false; | ||
} else { | ||
return Arrays.equals(serializedState(), ((FormatterStepEqualityOnStateSerialization<?>) o).serializedState()); | ||
} | ||
} | ||
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@Override | ||
public int hashCode() { | ||
return Arrays.hashCode(serializedState()); | ||
} | ||
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void cleanupFormatterFunc() { | ||
if (formatter instanceof FormatterFunc.Closeable) { | ||
((FormatterFunc.Closeable) formatter).close(); | ||
formatter = null; | ||
} | ||
} | ||
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private State state() throws Exception { | ||
if (stateInternal == null) { | ||
stateInternal = stateSupplier(); | ||
} | ||
return stateInternal; | ||
} | ||
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private byte[] serializedState() { | ||
if (serializedStateInternal == null) { | ||
serializedStateInternal = ThrowingEx.get(() -> LazyForwardingEquality.toBytes(state())); | ||
} | ||
return serializedStateInternal; | ||
} | ||
} |
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