org.chromium.sdk/src/org/chromium/sdk/internal/protocolparser/dynamicimpl/FieldConditionLogic.java
Initial version of WRT Debugger.
// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.sdk.internal.protocolparser.dynamicimpl;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import org.chromium.sdk.internal.protocolparser.JsonProtocolModelParseException;
import org.chromium.sdk.internal.protocolparser.JsonProtocolParseException;
import org.chromium.sdk.internal.protocolparser.JsonSubtypeCondition;
import org.chromium.sdk.internal.protocolparser.JsonSubtypeConditionBoolValue;
import org.chromium.sdk.internal.protocolparser.JsonSubtypeConditionCustom;
import org.chromium.sdk.internal.protocolparser.JsonValueCondition;
/**
* An interface to field conditions logic. Some conditions are simple and never need parsed
* values, others are more fine-grained and require quick parser before making actual checks.
*/
abstract class FieldConditionLogic {
private final boolean logicRequiresQuickParser;
FieldConditionLogic(boolean logicRequiresQuickParser) {
this.logicRequiresQuickParser = logicRequiresQuickParser;
}
boolean requiresQuickParser() {
return logicRequiresQuickParser;
}
/**
* @param hasValue whether field exists in JSON object (however its value may be null)
* @param quickParser parser that may be used if {@link #requiresQuickParser()} is true
*/
abstract boolean checkValue(boolean hasValue, Object unparsedValue, QuickParser<?> quickParser)
throws JsonProtocolParseException;
/**
* Constructor function that creates field condition logic from method annotations.
*/
static FieldConditionLogic readLogic(Method m) throws JsonProtocolModelParseException {
List<FieldConditionLogic> results = new ArrayList<FieldConditionLogic>(1);
JsonSubtypeConditionBoolValue boolValueAnn =
m.getAnnotation(JsonSubtypeConditionBoolValue.class);
if (boolValueAnn != null) {
final Boolean required = boolValueAnn.value();
results.add(new FieldConditionLogic(true) {
@Override
boolean checkValue(boolean hasValue, Object unparsedValue, QuickParser<?> parser)
throws JsonProtocolParseException {
return hasValue && required == parser.parseValueQuick(unparsedValue);
}
});
}
JsonSubtypeConditionCustom customAnn = m.getAnnotation(JsonSubtypeConditionCustom.class);
if (customAnn != null) {
final CustomConditionWrapper<?> constraint =
CustomConditionWrapper.create(customAnn.condition());
results.add(new FieldConditionLogic(true) {
@Override
boolean checkValue(boolean hasValue, Object unparsedValue, QuickParser<?> parser)
throws JsonProtocolParseException {
return hasValue && constraint.checkValue(parser.parseValueQuick(unparsedValue));
}
});
}
JsonSubtypeCondition conditionAnn = m.getAnnotation(JsonSubtypeCondition.class);
if (conditionAnn != null) {
int savedResSize = results.size();
if (conditionAnn.fieldIsAbsent()) {
results.add(new FieldConditionLogic(false) {
@Override
boolean checkValue(boolean hasValue, Object unparsedValue, QuickParser<?> parser) {
return !hasValue;
}
});
}
if (conditionAnn.valueIsNull()) {
results.add(new FieldConditionLogic(false) {
@Override
boolean checkValue(boolean hasValue, Object unparsedValue, QuickParser<?> parser) {
return hasValue && unparsedValue != null;
}
});
}
if (savedResSize == results.size()) {
results.add(new FieldConditionLogic(false) {
@Override
boolean checkValue(boolean hasValue, Object unparsedValue, QuickParser<?> parser) {
return hasValue;
}
});
}
}
if (results.size() == 0) {
return null;
}
if (results.size() > 1) {
throw new JsonProtocolModelParseException("Too many constraints for field getter " + m);
}
return results.get(0);
}
private static class CustomConditionWrapper<T> {
static <T, CL extends JsonValueCondition<T>> CustomConditionWrapper<T> create(
Class<CL> constraintClass) {
return new CustomConditionWrapper<T>(constraintClass);
}
private final JsonValueCondition<? super T> constraint;
private CustomConditionWrapper(Class<? extends JsonValueCondition<? super T>> constraintClass) {
try {
constraint = constraintClass.newInstance();
} catch (InstantiationException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
boolean checkValue(Object parsedValue) {
return constraint.conforms((T)parsedValue);
}
}
}