com.rdonasco.common.vaadin.view.utils.EmbeddedResourceBuilder.java Source code

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Here is the source code for com.rdonasco.common.vaadin.view.utils.EmbeddedResourceBuilder.java

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/*
 * Copyright 2012 Roy F. Donasco.
 *
 * 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.rdonasco.common.vaadin.view.utils;

import com.rdonasco.common.exceptions.InvalidBuilderParameter;
import com.vaadin.Application;
import com.vaadin.terminal.Sizeable;
import com.vaadin.terminal.StreamResource;
import com.vaadin.terminal.ThemeResource;
import com.vaadin.ui.Embedded;
import java.io.ByteArrayInputStream;
import java.io.InputStream;

/**
 *
 * @author Roy F. Donasco
 */
public class EmbeddedResourceBuilder {

    private byte[] bytes;
    private String caption;
    private String description;
    private Application application;
    private String name;
    private String alternateText;
    private String resourceId;
    private Float height;
    private int units = Sizeable.UNITS_PIXELS;
    private Float width;

    public EmbeddedResourceBuilder() {
    }

    public EmbeddedResourceBuilder setApplication(Application application) {
        this.application = application;
        return this;
    }

    public EmbeddedResourceBuilder setByteSource(byte[] bytes) {
        this.bytes = bytes;
        return this;
    }

    public EmbeddedResourceBuilder setCaption(String caption) {
        this.caption = caption;
        return this;
    }

    public EmbeddedResourceBuilder setDescription(String description) {
        this.description = description;
        return this;
    }

    public EmbeddedResourceBuilder setName(String name) {
        this.name = name;
        return this;
    }

    public EmbeddedResourceBuilder setAlternateText(String alternateText) {
        this.alternateText = alternateText;
        return this;
    }

    public EmbeddedResourceBuilder setResourceId(String resourceId) {
        this.resourceId = resourceId;
        return this;
    }

    public EmbeddedResourceBuilder setHeight(float height, int units) {
        this.height = height;
        this.units = units;
        return this;
    }

    public EmbeddedResourceBuilder setWidth(float width, int units) {
        this.width = width;
        this.units = units;
        return this;
    }

    public Embedded createEmbedded() throws InvalidBuilderParameter {
        if (null == application) {
            throw new InvalidBuilderParameter("application not set");
        }
        if (null == name) {
            throw new InvalidBuilderParameter("name not set");
        }
        Embedded embedded = null;
        if (null != bytes) {
            embedded = createUsingStreamSource();
        } else if (null != resourceId) {
            embedded = createUsingResourceId();
        } else {
            throw new InvalidBuilderParameter("bytes or resource ID is not set");
        }
        embedded.setDescription(description);
        embedded.setAlternateText(alternateText);
        if (null != height) {
            embedded.setHeight(height, units);
        }
        if (null != width) {
            embedded.setWidth(width, units);
        }

        return embedded;
    }

    private Embedded createUsingStreamSource() {
        StreamResource.StreamSource streamSource = new StreamResource.StreamSource() {
            private static final long serialVersionUID = 1L;

            @Override
            public InputStream getStream() {
                return new ByteArrayInputStream(bytes);
            }
        };
        StreamResource resource = new StreamResource(streamSource, name, application);
        Embedded embedded = new Embedded(caption, resource);

        return embedded;
    }

    private Embedded createUsingResourceId() {
        return new Embedded(caption, new ThemeResource(resourceId));
    }
}