com.insightfullogic.stripper.ClassRules.java Source code

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Here is the source code for com.insightfullogic.stripper.ClassRules.java

Source

/*
 *   Copyright (c) 2012, Richard Warburton <richard.warburton@gmail.com>
 *   
 *   This file is part of Stripper.
 *     
 *   Stripper 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 3 of the License, or
 *   (at your option) any later version.
 *
 *   Stripper 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.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with Stripper.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.insightfullogic.stripper;

import static com.google.common.collect.Collections2.filter;

import java.util.ArrayList;
import java.util.List;

import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.MethodNode;
import org.python.core.PyObject;
import org.python.util.PythonInterpreter;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;

public class ClassRules {

    @VisibleForTesting
    final List<MethodPredicate> predicates;

    public static ClassRules compileFrom(final String rulesFile) {
        // load up rules
        final PythonInterpreter python = new PythonInterpreter();
        python.execfile(rulesFile);
        final PyObject rules = python.get("rules");

        final List<MethodPredicate> predicates = new ArrayList<>();
        for (int i = 0; i < rules.__len__(); i++) {
            final PyObject rule = rules.__getitem__(i);
            predicates.add((MethodPredicate) rule.__tojava__(MethodPredicate.class));
        }
        return new ClassRules(predicates);
    }

    private ClassRules(final List<MethodPredicate> predicates) {
        this.predicates = predicates;
    }

    @SuppressWarnings("unchecked")
    public void strip(final ClassNode cls) {
        final Predicate<MethodNode> onePredicate = Predicates.not(Predicates.or(predicates));
        cls.methods = new ArrayList<>(filter(cls.methods, onePredicate));
    }
}