org.kuali.student.git.model.tree.JGitTreeData.java Source code

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Here is the source code for org.kuali.student.git.model.tree.JGitTreeData.java

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/*
 *  Copyright 2014 The Kuali Foundation Licensed under the
 *   Educational Community 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.osedu.org/licenses/ECL-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.kuali.student.git.model.tree;

import java.util.Comparator;

import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectId;

/*
 * Git Tree's require that the tree's and blobs are sorted alphabetically.
 * 
 * http://git.661346.n2.nabble.com/In-tree-object-Must-the-td7446900.html
 */
public class JGitTreeData {

    public static Comparator<JGitTreeData> GIT_SORT_ORDERING = new Comparator<JGitTreeData>() {

        // copied from JGit version 3 DirCache
        int cmp(final byte[] aPath, final int aLen, final byte[] bPath, final int bLen) {
            for (int cPos = 0; cPos < aLen && cPos < bLen; cPos++) {
                final int cmp = (aPath[cPos] & 0xff) - (bPath[cPos] & 0xff);
                if (cmp != 0)
                    return cmp;
            }
            return aLen - bLen;
        }

        /* (non-Javadoc)
         * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
         */
        @Override
        public int compare(JGitTreeData o1, JGitTreeData o2) {

            byte[] byteName1 = o1.getByteName();
            byte[] byteName2 = o2.getByteName();

            return cmp(byteName1, byteName1.length, byteName2, byteName2.length);

        }

    };

    private byte[] byteName;

    private String name;
    private FileMode fileMode;
    private ObjectId objectId;

    /**
     * @param name
     * @param fileMode
     * @param objectId
     */
    public JGitTreeData(String name, FileMode fileMode, ObjectId objectId) {
        super();
        this.name = name;
        this.byteName = getByteName(name, fileMode);
        this.fileMode = fileMode;
        this.objectId = objectId;
    }

    private byte[] getByteName(String name, FileMode fileMode) {

        StringBuilder nameBuilder = new StringBuilder(name);

        if (fileMode == FileMode.TREE)
            nameBuilder.append("/");

        return Constants.encode(nameBuilder.toString());

    }

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @return the fileMode
     */
    public FileMode getFileMode() {
        return fileMode;
    }

    /**
     * @return the objectId
     */
    public ObjectId getObjectId() {
        return objectId;
    }

    /**
     * @return the byteName
     */
    public byte[] getByteName() {
        return byteName;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        builder.append("JGitTreeData [name=");
        builder.append(name);
        builder.append(", fileMode=");
        builder.append(fileMode);
        builder.append(", objectId=");
        builder.append(objectId);
        builder.append("]");
        return builder.toString();
    }

}