com.tasktop.c2c.server.common.web.client.widgets.chooser.MultiValueChooser.java Source code

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Here is the source code for com.tasktop.c2c.server.common.web.client.widgets.chooser.MultiValueChooser.java

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/*******************************************************************************
 * Copyright (c) 2010, 2012 Tasktop Technologies
 * Copyright (c) 2010, 2011 SpringSource, a division of VMware
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Tasktop Technologies - initial API and implementation
 ******************************************************************************/
package com.tasktop.c2c.server.common.web.client.widgets.chooser;

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

import com.google.gwt.editor.client.Editor;
import com.google.gwt.editor.client.IsEditor;
import com.google.gwt.editor.client.adapters.TakesValueEditor;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.HasValue;
import com.google.gwt.user.client.ui.SuggestOracle;

/**
 * @author David Green (Tasktop Technologies Inc.)
 * @author Lucas Panjer (Tasktop Technologies Inc.)
 * 
 */
public class MultiValueChooser<T> extends AbstractValueChooser<T>
        implements HasValue<List<T>>, IsEditor<Editor<List<T>>> {
    private List<T> values;

    public MultiValueChooser(SuggestOracle suggest) {
        super(suggest);
    }

    /**
     * The values to choose
     */
    public List<T> getValues() {
        if (values == null) {
            return Collections.emptyList();
        }
        return values;
    }

    public void setValues(List<T> values) {
        this.values = values;
        updateUi();
    }

    public HandlerRegistration addValueChangeHandler(ValueChangeHandler<List<T>> handler) {
        return addHandler(handler, ValueChangeEvent.getType());
    }

    protected void addValue(T value) {
        addValue(value, true);
    }

    private boolean addValueInternal(T value) {
        if (values == null || !values.contains(value)) {
            List<T> newValues = new ArrayList<T>();
            if (values != null) {
                newValues.addAll(values);
            }
            newValues.add(value);
            setValues(newValues);
            return true;
        }
        return false;
    }

    public void addValue(T value, boolean fireEvents) {
        if (addValueInternal(value) && fireEvents) {
            fireValueChanged();
        }
    }

    public void removeValue(Object value) {
        List<T> newValues = new ArrayList<T>();
        if (values != null) {
            newValues.addAll(values);
        }
        newValues.remove(value);
        setValues(newValues);
        fireValueChanged();
    }

    protected void fireValueChanged() {
        ValueChangeEvent.fire(this, getValues());
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.google.gwt.user.client.ui.HasValue#getValue()
     */
    @Override
    public List<T> getValue() {
        return getValues();
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.google.gwt.user.client.ui.HasValue#setValue(java.lang.Object)
     */
    @Override
    public void setValue(List<T> value) {
        setValues(value);

    }

    /*
     * (non-Javadoc)
     * 
     * @see com.google.gwt.user.client.ui.HasValue#setValue(java.lang.Object, boolean)
     */
    @Override
    public void setValue(List<T> value, boolean fireEvents) {
        setValue(value);
        if (fireEvents) {
            fireValueChanged();
        }

    }

    private Editor<List<T>> editor = null;

    @Override
    public Editor<List<T>> asEditor() {
        if (editor == null) {
            editor = TakesValueEditor.of(this);
        }
        return editor;
    }
}