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A repackaged copy of javac for Error Prone to depend on
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/*
 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package jdk.jshell;

import java.util.ArrayList;
import java.util.Collection;
import java.util.stream.Collectors;

/**
 * List of diagnostics, with convenient operations.
 *
 * @author Robert Field
 */
@SuppressWarnings("serial")             // serialVersionUID intentionally omitted
final class DiagList extends ArrayList {

    private int cntNotStmt = 0;
    private int cntUnreach = 0;
    private int cntResolve = 0;
    private int cntOther = 0;

    DiagList() {
        super();
    }

    DiagList(Diag d) {
        super();
        add(d);
    }

    DiagList(Collection c) {
        super();
        addAll(c);
    }

    private void tally(Diag d) {
        if (d.isError()) {
            if (d.isUnreachableError()) {
                ++cntUnreach;
            } else if (d.isNotAStatementError()) {
                ++cntNotStmt;
            } else if (d.isResolutionError()) {
                ++cntResolve;
            } else {
                ++cntOther;
            }
        }
    }

    @Override
    public boolean addAll(Collection c) {
        return c.stream().filter(d -> add(d)).count() > 0;
    }

    @Override
    public Diag set(int index, Diag element) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void add(int index, Diag element) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean add(Diag d) {
        boolean added = super.add(d);
        if (added) {
            tally(d);
        }
        return added;
    }

    @Override
    public boolean addAll(int index, Collection c) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean remove(Object o) {
        throw new UnsupportedOperationException();
    }

    DiagList ofUnit(Unit u) {
        return this.stream()
                .filter(d -> d.unitOrNull() == u)
                .collect(Collectors.toCollection(() -> new DiagList()));
    }

    boolean hasErrors() {
        return (cntNotStmt + cntResolve + cntUnreach + cntOther) > 0;
    }

    boolean hasResolutionErrorsAndNoOthers() {
        return cntResolve > 0 && (cntNotStmt + cntUnreach + cntOther) == 0;
    }

    boolean hasUnreachableError() {
        return cntUnreach > 0;
    }

    boolean hasNotStatement() {
        return cntNotStmt > 0;
    }

    boolean hasOtherThanNotStatementErrors() {
        return (cntResolve + cntUnreach + cntOther) > 0;
    }

}