com.mercatis.lighthouse3.ui.swimlaneeditor.providers.UnequalSelection.java Source code

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Here is the source code for com.mercatis.lighthouse3.ui.swimlaneeditor.providers.UnequalSelection.java

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/*
 * Copyright 2011 mercatis Technologies AG
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.mercatis.lighthouse3.ui.swimlaneeditor.providers;

import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import org.eclipse.jface.viewers.IStructuredSelection;

/**
 * An IStructuredSelection that never equals another one.
 * 
 */
public class UnequalSelection implements IStructuredSelection {

    private Object selection;

    public UnequalSelection(Object selection) {
        this.selection = selection;
    }

    @Override
    public boolean equals(Object obj) {
        return false;
    }

    public Object getFirstElement() {
        return selection;
    }

    @SuppressWarnings("rawtypes")
    public Iterator iterator() {
        return toList().iterator();
    }

    public int size() {
        return selection == null ? 0 : 1;
    }

    public Object[] toArray() {
        return selection == null ? new Object[0] : new Object[] { selection };
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public List toList() {
        List list;
        if (selection == null) {
            list = Collections.EMPTY_LIST;
        } else {
            list = new LinkedList();
            list.add(selection);
        }
        return list;
    }

    public boolean isEmpty() {
        return selection == null;
    }
}