GuavaCustConcHash.java

/*
 * Copyright © 2011, 2012 On-Site.com.
 * Copyright © 2015 Chris Jester-Young.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * for more details.
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 * You should have received a copy of the GNU General Public License along
 * with this work. If not, see <http://www.gnu.org/licenses/>.
 *
 * Linking this library statically or dynamically with other modules is
 * making a combined work based on this library. Thus, the terms and
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 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent modules,
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package com.sun.tools.hat.internal.lang.guava;

import java.util.List;

import com.google.common.collect.ImmutableMap;

import com.sun.tools.hat.internal.lang.Models;
import com.sun.tools.hat.internal.lang.common.SimpleMapModel;
import com.sun.tools.hat.internal.model.JavaObject;
import com.sun.tools.hat.internal.model.JavaThing;
import com.sun.tools.hat.internal.util.Suppliers;

class GuavaCustConcHash extends SimpleMapModel {
    private static ImmutableMap<JavaThing, JavaThing> getMapImpl(Iterable<JavaObject> segments) {
        ImmutableMap.Builder<JavaThing, JavaThing> builder = ImmutableMap.builder();
        for (JavaObject segment : segments) {
            JavaObject table = Models.getFieldObject(segment, "table");
            List<JavaObject> array = Models.getFieldObjectArray(table, "array", JavaObject.class);
            if (array != null) {
                for (JavaObject entry : array) {
                    // Strong keys use the "key" field
                    // Soft/weak keys use the "referent" field
                    JavaThing key = entry.getField("key");
                    if (key == null)
                        key = entry.getField("referent");
                    JavaObject value = Models.getFieldObjectChain(entry, "valueReference", "referent");
                    if (key != null && value != null)
                        builder.put(key, value);
                }
            }
        }
        return builder.build();
    }

    private GuavaCustConcHash(Guava factory, List<JavaObject> segments) {
        super(factory, Suppliers.memoize(() -> getMapImpl(segments)));
    }

    public static GuavaCustConcHash make(Guava factory, JavaObject chm) {
        List<JavaObject> segments = Models.getFieldObjectArray(chm, "segments", JavaObject.class);
        return segments == null ? null : new GuavaCustConcHash(factory, segments);
    }
}