com.google.gwt.core.ext.linker.SyntheticArtifact.java Source code

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Here is the source code for com.google.gwt.core.ext.linker.SyntheticArtifact.java

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/*
 * Copyright 2008 Google Inc.
 * 
 * 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.google.gwt.core.ext.linker;

import com.google.gwt.core.ext.Linker;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.dev.util.DiskCache;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;

/**
 * Artifacts created by {@link AbstractLinker}.
 */
public class SyntheticArtifact extends EmittedArtifact {
    private static final DiskCache diskCache = DiskCache.INSTANCE;

    private final long lastModified;
    private transient long token;

    public SyntheticArtifact(Class<? extends Linker> linkerType, String partialPath, byte[] data) {
        this(linkerType, partialPath, data, System.currentTimeMillis());
    }

    public SyntheticArtifact(Class<? extends Linker> linkerType, String partialPath, byte[] data,
            long lastModified) {
        super(linkerType, partialPath);
        assert data != null;
        this.lastModified = lastModified;
        this.token = diskCache.writeByteArray(data);
    }

    @Override
    public InputStream getContents(TreeLogger logger) throws UnableToCompleteException {
        return new ByteArrayInputStream(diskCache.readByteArray(token));
    }

    @Override
    public long getLastModified() {
        return lastModified;
    }

    @Override
    public void writeTo(TreeLogger logger, OutputStream out) throws UnableToCompleteException {
        diskCache.transferToStream(token, out);
    }

    private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        token = diskCache.transferFromStream(stream);
    }

    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        diskCache.transferToStream(token, stream);
    }
}