OpenConcerto

Dépôt officiel du code source de l'ERP OpenConcerto
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svn://code.openconcerto.org/openconcerto

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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 *
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 * Copyright 2011-2019 OpenConcerto, by ILM Informatique. All rights reserved.
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 *
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 * The contents of this file are subject to the terms of the GNU General Public License Version 3
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 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a
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 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific
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 * language governing permissions and limitations under the License.
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 *
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 * When distributing the software, include this License Header Notice in each file.
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 */
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 package org.openconcerto.utils.change;
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import org.openconcerto.utils.CopyUtils;
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import org.openconcerto.utils.cc.ITransformer;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.List;
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public abstract class ListChangeIndex<T> implements ListChange<T> {
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    protected final static <T> Collection<T> copy(final Collection<T> col) {
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        Collection<T> res;
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        try {
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            // tries to keep the same class
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            res = CopyUtils.copy(col);
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        } catch (final RuntimeException e) {
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            // but this doesn't always work (see sublist())
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            // so just use a plain ArrayList
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            res = new ArrayList<T>(col);
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        }
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        return res;
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    }
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    private final int index0;
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    private final int index1;
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    public ListChangeIndex(final int index0, final int index1) {
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        super();
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        this.index0 = index0;
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        this.index1 = index1;
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    }
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    protected final int getIndex0() {
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        return this.index0;
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    }
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    protected final int getIndex1() {
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        return this.index1;
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    }
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    public abstract Collection<? extends T> getItemsAdded();
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    public abstract List<? extends T> getItemsRemoved();
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    public static class Rm<T> extends ListChangeIndex<T> {
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        private final List<T> removed;
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        public Rm(final int index0, final int index1, final List<T> removed) {
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            super(index0, index1);
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            // ok to cast : either it copies it : List<T>, either it uses an arrayList which
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            // implements List<T>
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            this.removed = (List<T>) copy(removed);
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        }
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        @Override
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        public <U> void apply(final List<U> l, final ITransformer<T, U> transf) {
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            // sublist exclusive
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            l.subList(this.getIndex0(), this.getIndex1() + 1).clear();
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        }
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        @Override
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        public List<? extends T> getItemsAdded() {
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            return Collections.emptyList();
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        }
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        @Override
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        public List<T> getItemsRemoved() {
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            return this.removed;
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        }
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        @Override
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        public String toString() {
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            return "@" + this.getIndex0() + ";" + this.getIndex1() + " removed " + this.getItemsRemoved();
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        }
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    }
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    public static class Add<T> extends ListChangeIndex<T> {
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        private final Collection<? extends T> added;
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        public Add(final int index0, final Collection<? extends T> added) {
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            super(index0, index0);
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            this.added = copy(added);
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        }
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        @Override
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        public <U> void apply(final List<U> l, final ITransformer<T, U> transf) {
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            final List<U> toAdd = new ArrayList<U>();
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            for (final T t : this.added) {
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                toAdd.add(transf.transformChecked(t));
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            }
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            l.addAll(this.getIndex0(), toAdd);
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        }
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        @Override
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        public Collection<? extends T> getItemsAdded() {
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            return this.added;
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        }
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        @Override
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        public List<? extends T> getItemsRemoved() {
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            return Collections.emptyList();
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        }
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        @Override
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        public String toString() {
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            return "@" + this.getIndex0() + " added " + this.getItemsAdded();
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        }
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    }
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    public static class Set<T> extends ListChangeIndex<T> {
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        private final T removed;
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        private final T added;
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        public Set(final int index, final T removed, final T added) {
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            super(index, index);
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            this.removed = removed;
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            this.added = added;
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        }
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        @Override
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        public <U> void apply(final List<U> l, final ITransformer<T, U> transf) {
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            l.set(this.getIndex0(), transf.transformChecked(this.added));
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        }
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        @Override
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        public List<? extends T> getItemsAdded() {
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            return Collections.singletonList(this.added);
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        }
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        @Override
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        public List<? extends T> getItemsRemoved() {
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            return Collections.singletonList(this.removed);
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        }
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        @Override
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        public String toString() {
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            return "@" + this.getIndex0() + " replaced " + this.removed + " by " + this.added;
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        }
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    }
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}