org.cloudata.core.client.CellValueMatcherInfo.java Source code

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Here is the source code for org.cloudata.core.client.CellValueMatcherInfo.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.cloudata.core.client;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.cloudata.core.common.exception.GetFailException;
import org.cloudata.core.common.io.CWritable;
import org.cloudata.core.common.io.CWritableUtils;
import org.cloudata.core.common.util.ByteCodeClassLoader;

/**
 * @author jindolk
 *
 */
public class CellValueMatcherInfo implements CWritable {

    public static final Log LOG = LogFactory.getLog(CellValueMatcherInfo.class.getName());

    private List<String> classNames = new ArrayList<String>();
    private List<byte[]> classBytes = new ArrayList<byte[]>();
    private CellValueMatcher matcher;
    private int version;

    ByteCodeClassLoader classLoader;

    public CellValueMatcherInfo() {
        classLoader = new ByteCodeClassLoader(CellValueMatcherInfo.class.getClassLoader());
    }

    public int getVersion() {
        return version;
    }

    public void setVersion(int version) {
        this.version = version;
    }

    public List<String> getClassNames() {
        return classNames;
    }

    public void addClassInfo(Class<?> clazz) throws IOException {
        this.classNames.add(clazz.getName());
        this.classBytes.add(classLoader.getClassBytes(clazz, version));
    }

    public List<byte[]> getClassBytes() {
        return classBytes;
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        this.version = in.readInt();

        int classCount = in.readInt();

        for (int i = 0; i < classCount; i++) {
            String className = CWritableUtils.readString(in);
            int length = in.readInt();

            if (length > 0) {
                byte[] classByte = new byte[length];
                in.readFully(classByte);

                classNames.add(className);
                classBytes.add(classByte);
            }
        }
    }

    @Override
    public void write(DataOutput out) throws IOException {
        out.writeInt(this.version);

        int classCount = classNames.size();
        out.writeInt(classCount);

        for (int i = 0; i < classCount; i++) {
            CWritableUtils.writeString(out, classNames.get(i));
            byte[] classByte = classBytes.get(i);
            out.writeInt(classByte.length);
            out.write(classByte);
        }
    }

    /**
     * @return
     */
    public CellValueMatcher getCellValueMatcher() throws IOException {
        if (this.matcher != null) {
            return this.matcher;
        }
        int classCount = classNames.size();
        if (classCount == 0) {
            return null;
        }

        try {
            for (int i = 0; i < classCount; i++) {
                classLoader.addClassBytes(classNames.get(i), version, classBytes.get(i));
            }

            Class<?> matcherClass = classLoader.loadClass(classNames.get(0));
            for (int i = classCount - 1; i > 0; i--) {
                classLoader.loadClass(classNames.get(i));
            }
            this.matcher = (CellValueMatcher) (matcherClass.newInstance());
            return this.matcher;
        } catch (Exception e) {
            LOG.error("CellValueMatcher class load error:" + e.getMessage(), e);
            throw new GetFailException(e);
        } catch (Error e) {
            LOG.error("CellValueMatcher class load error:" + e.getMessage(), e);
            throw new GetFailException(e);
        }
    }
}