org.alloy.site.resource.GeneratedResource.java Source code

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Here is the source code for org.alloy.site.resource.GeneratedResource.java

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/*
* #%L
* BroadleafCommerce Common Libraries
* %%
* Copyright (C) 2009 - 2013 Broadleaf Commerce
* %%
* 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.
* #L%
*/
package org.alloy.site.resource;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.util.Arrays;

import org.apache.commons.lang3.StringUtils;
import org.springframework.core.io.AbstractResource;
import org.springframework.security.util.InMemoryResource;
import org.springframework.util.Assert;
import org.springframework.web.servlet.resource.ResourceHttpRequestHandler;

/**
* An in memory generated resource. This class also overrides some parent Spring AbstractResource methods to ensure
* compatibility with the {@link ResourceHttpRequestHandler}.
*
* Note that this class <i>intentionally</i> does not subclass Spring's {@link InMemoryResource} and instead has copied
* the fields here because {@link InMemoryResource} does not provide a default constructor. This causes issues when
* deserializing an instance from disk (such as in a caching scenario that overflows from memory to disk).
*
* @author Andre Azzolini (apazzolini)
*/
public class GeneratedResource extends AbstractResource implements Serializable {
    private static final long serialVersionUID = 7044543270746433688L;

    protected long timeGenerated;
    protected String hashRepresentation;

    protected final byte[] source;
    protected final String description;

    /**
    * <b>Note: This constructor should not be explicitly used</b>
    *
    * To properly allow for serialization, we must provide this no-arg constructor that will
    * create a "dummy" GeneratedResource. The appropriate fields will be set during deserialization.
    */
    public GeneratedResource() {
        this(new byte[] {}, null);
    }

    public GeneratedResource(byte[] source, String description) {
        Assert.notNull(source);
        this.source = source;
        this.description = description;
        timeGenerated = System.currentTimeMillis();
    }

    @Override
    public String getFilename() {
        return getDescription();
    }

    @Override
    public long lastModified() throws IOException {
        return timeGenerated;
    }

    public String getHashRepresentation() {
        return StringUtils.isBlank(hashRepresentation) ? String.valueOf(timeGenerated) : hashRepresentation;
    }

    public void setHashRepresentation(String hashRepresentation) {
        this.hashRepresentation = hashRepresentation;
    }

    @Override
    public String getDescription() {
        return description;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(source);
    }

    @Override
    public int hashCode() {
        return 1;
    }

    @Override
    public boolean equals(Object res) {
        if (res == null) {
            return false;
        }
        if (!getClass().isAssignableFrom(res.getClass())) {
            return false;
        }

        return Arrays.equals(source, ((GeneratedResource) res).source);
    }
}