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Java example source code file (FilterChain.java)

This example Java source code file (FilterChain.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, changedevent, changedeventprovider, filter, filterchain, list, util

The FilterChain.java Java example source code

/*
 * Copyright (c) 2008, 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.
 *
 * 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 com.sun.hotspot.igv.filter;

import com.sun.hotspot.igv.graph.Diagram;
import com.sun.hotspot.igv.data.ChangedEvent;
import com.sun.hotspot.igv.data.ChangedEventProvider;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 *
 * @author Thomas Wuerthinger
 */
public class FilterChain implements ChangedEventProvider<FilterChain> {

    private List<Filter> filters;
    private transient ChangedEvent<FilterChain> changedEvent;
    private boolean fireEvents;

    public FilterChain() {
        filters = new ArrayList<Filter>();
        changedEvent = new ChangedEvent<FilterChain>(this);
        this.fireEvents = true;
    }

    public FilterChain(FilterChain f) {
        this.filters = new ArrayList<Filter>(f.filters);
        changedEvent = new ChangedEvent<FilterChain>(this);
        this.fireEvents = true;
    }

    public ChangedEvent<FilterChain> getChangedEvent() {
        return changedEvent;
    }

    public Filter getFilterAt(int index) {
        assert index >= 0 && index < filters.size();
        return filters.get(index);
    }

    public void apply(Diagram d) {
        for (Filter f : filters) {
            f.apply(d);
        }
    }

    public void apply(Diagram d, FilterChain sequence) {
        List<Filter> applied = new ArrayList();
        for (Filter f : sequence.getFilters()) {
            if (filters.contains(f)) {
                f.apply(d);
                applied.add(f);
            }
        }


        for (Filter f : filters) {
            if (!applied.contains(f)) {
                f.apply(d);
            }
        }
    }

    public void beginAtomic() {
        this.fireEvents = false;
    }

    public void endAtomic() {
        this.fireEvents = true;
        changedEvent.fire();
    }

    public void addFilter(Filter filter) {
        assert filter != null;
        filters.add(filter);
        if (fireEvents) {
            changedEvent.fire();
        }
    }

    public void addFilterSameSequence(Filter filter) {
        assert filter != null;
        filters.add(filter);
        if (fireEvents) {
            changedEvent.fire();
        }
    }

    public boolean containsFilter(Filter filter) {
        return filters.contains(filter);
    }

    public void removeFilter(Filter filter) {
        assert filters.contains(filter);
        filters.remove(filter);
        if (fireEvents) {
            changedEvent.fire();
        }
    }

    public void moveFilterUp(Filter filter) {
        assert filters.contains(filter);
        int index = filters.indexOf(filter);
        if (index != 0) {
            filters.remove(index);
            filters.add(index - 1, filter);
        }
        if (fireEvents) {
            changedEvent.fire();
        }
    }

    public void moveFilterDown(Filter filter) {
        assert filters.contains(filter);
        int index = filters.indexOf(filter);
        if (index != filters.size() - 1) {
            filters.remove(index);
            filters.add(index + 1, filter);
        }
        if (fireEvents) {
            changedEvent.fire();
        }
    }

    public List<Filter> getFilters() {
        return Collections.unmodifiableList(filters);
    }

    public void clear() {
        filters.clear();
    }
}

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