// 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;
import org.chromium.sdk.internal.protocolparser.dynamicimpl.JavaCodeGenerator.ClassScope;
import org.chromium.sdk.internal.protocolparser.dynamicimpl.JavaCodeGenerator.MethodScope;
/**
* 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);
}
@Override
void writeCheckJava(MethodScope scope, String valueRef, String hasValueRef,
String resultRef, QuickParser<?> quickParser) {
scope.startLine("boolean " + resultRef + ";\n");
scope.startLine("if (" + hasValueRef + ") {\n");
scope.indentRight();
quickParser.writeParseQuickCode(scope, valueRef, "parserResult");
scope.startLine(resultRef + " = " + required + " == parserResult;\n");
scope.indentLeft();
scope.startLine("} else {\n");
scope.startLine(" " + resultRef + " = false;\n");
scope.startLine("}\n");
}
});
}
JsonSubtypeConditionCustom customAnn = m.getAnnotation(JsonSubtypeConditionCustom.class);
if (customAnn != null) {
Class<? extends JsonValueCondition<?>> condition = customAnn.condition();
// We do not know exact type of condition. But we also do not care about result type
// in 'constraint'. Compiler cannot catch the wildcard here, so we use an assumed type.
Class<? extends JsonValueCondition<Void>> assumedTypeCondition =
(Class<? extends JsonValueCondition<Void>>) customAnn.condition();
final CustomConditionWrapper<?> constraint =
CustomConditionWrapper.create(assumedTypeCondition);
results.add(new FieldConditionLogic(true) {
@Override
boolean checkValue(boolean hasValue, Object unparsedValue, QuickParser<?> parser)
throws JsonProtocolParseException {
return hasValue && constraint.checkValue(parser.parseValueQuick(unparsedValue));
}
@Override
void writeCheckJava(MethodScope scope, String valueRef, String hasValueRef,
String resultRef, QuickParser<?> quickParser) {
scope.startLine("boolean " + resultRef + ";\n");
scope.startLine("if (" + hasValueRef + ") {\n");
scope.indentRight();
quickParser.writeParseQuickCode(scope, valueRef, "parserResult");
constraint.writeParseJava(scope, "parserResult", "constraintResult");
scope.startLine(resultRef + " = constraintResult;\n");
scope.indentLeft();
scope.startLine("} else {\n");
scope.startLine(" " + resultRef + " = false;\n");
scope.startLine("}\n");
}
});
}
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;
}
@Override
void writeCheckJava(MethodScope scope, String valueRef, String hasValueRef,
String resultRef, QuickParser<?> quickParser) {
scope.startLine("boolean " + resultRef + " = !" + hasValueRef + ";\n");
}
});
}
if (conditionAnn.valueIsNull()) {
results.add(new FieldConditionLogic(false) {
@Override
boolean checkValue(boolean hasValue, Object unparsedValue, QuickParser<?> parser) {
return hasValue && unparsedValue != null;
}
@Override
void writeCheckJava(MethodScope scope, String valueRef, String hasValueRef,
String resultRef, QuickParser<?> quickParser) {
scope.startLine("boolean " + resultRef + " = " + valueRef + " != null;\n");
}
});
}
if (savedResSize == results.size()) {
results.add(new FieldConditionLogic(false) {
@Override
boolean checkValue(boolean hasValue, Object unparsedValue, QuickParser<?> parser) {
return hasValue;
}
@Override
void writeCheckJava(MethodScope scope, String valueRef, String hasValueRef,
String resultRef, QuickParser<?> quickParser) {
scope.startLine("boolean " + resultRef + " = " + hasValueRef + ";\n");
}
});
}
}
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> CustomConditionWrapper<T> create(
Class<? extends JsonValueCondition<T>> 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);
}
public void writeParseJava(ClassScope classScope, String valueRef, String resultRef) {
abstract class StaticField implements JavaCodeGenerator.ElementData {
abstract String getFieldName();
}
StaticField field = classScope.getRootClassScope().addMember(constraint.getClass(),
new JavaCodeGenerator.ElementFactory<StaticField>() {
@Override
public StaticField create(final int code) {
return new StaticField() {
@Override public void generateCode(ClassScope classScope) {
classScope.startLine("private static final " +
constraint.getClass().getCanonicalName() + " " + getFieldName() + " = new " +
constraint.getClass().getCanonicalName() + "();\n");
}
@Override String getFieldName() {
return "CUSTOM_CONDITION_" + code;
}
};
}
});
classScope.startLine("boolean " + resultRef + " = " + field.getFieldName() + ".conforms(" +
valueRef + ");\n");
}
}
abstract void writeCheckJava(MethodScope methodScope, String valueRef, String hasValueRef,
String resultRef, QuickParser<?> quickParser);
}