--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.chromium.sdk/src/org/chromium/sdk/internal/protocolparser/dynamicimpl/FieldConditionLogic.java	Wed Dec 23 17:13:18 2009 -0800
@@ -0,0 +1,129 @@
+// 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);
+    }
+  }
+
+}
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