com.google.gwt.dev.cfg.Rule.java Source code

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Here is the source code for com.google.gwt.dev.cfg.Rule.java

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/*
 * Copyright 2006 Google Inc.
 * 
 * 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.google.gwt.dev.cfg;

import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.dev.javac.StandardGeneratorContext;
import com.google.gwt.dev.javac.rebind.RebindResult;

/**
 * Abstract base class for various kinds of deferred binding rules.
 */
public abstract class Rule {

    private int fallbackEvalCost = Integer.MAX_VALUE;
    private final ConditionAll rootCondition = new ConditionAll();

    /**
     * Returns the cost of evaluation fallback binding values.
     * when isApplicable() is true, this value is meaningless
     * when isApplicable() is false, [1,Integer.MAX_VALUE-1] means 
     * a relative scale of cost, where cost c is better than cost c+k
     * Integer.MAX_VALUE implies no match.
     * @return cost of evaluating fallback values.
     */
    public int getFallbackEvaluationCost() {
        return fallbackEvalCost;
    }

    public ConditionAll getRootCondition() {
        return rootCondition;
    }

    public boolean isApplicable(TreeLogger logger, StandardGeneratorContext context, String typeName)
            throws UnableToCompleteException {
        DeferredBindingQuery query = new DeferredBindingQuery(context.getPropertyOracle(),
                context.getActiveLinkerNames(), context.getCompilationState(), typeName);
        boolean result = rootCondition.isTrue(logger, query);
        fallbackEvalCost = query.getFallbackEvaluationCost();
        return result;
    }

    public abstract RebindResult realize(TreeLogger logger, StandardGeneratorContext context, String typeName)
            throws UnableToCompleteException;

    protected void dispose() {
    }
}