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The DiffUtils library for computing diffs, applying patches, generationg side-by-side view in Java.
There is a newer version: 1.5.0
/*
   Copyright 2010 Dmitry Naumenko ([email protected])

   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 difflib;

import static com.google.common.base.Preconditions.checkNotNull;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * Describes the diff row in form [tag, oldLine, newLine) for showing the
 * difference between two texts
 * 
 * @author Dmitry Naumenko
 */
public class DiffRow {
    @Nonnull
    private Tag tag;
    @Nullable
    private String oldLine;
    @Nullable
    private String newLine;
    
    public DiffRow(@Nonnull Tag tag, @Nullable String oldLine, @Nullable String newLine) {
        this.tag = checkNotNull(tag);
        this.oldLine = oldLine;
        this.newLine = newLine;
    }
    
    public static enum Tag {
        INSERT, DELETE, CHANGE, EQUAL
    }
    
    /**
     * @return the tag
     */
    @Nonnull
    public Tag getTag() {
        return tag;
    }
    
    /**
     * @param tag the tag to set
     */
    public void setTag(Tag tag) {
        this.tag = tag;
    }
    
    /**
     * @return the oldLine
     */
    @Nullable
    public String getOldLine() {
        return oldLine;
    }
    
    /**
     * @param oldLine the oldLine to set
     */
    public void setOldLine(@Nullable String oldLine) {
        this.oldLine = oldLine;
    }
    
    /**
     * @return the newLine
     */
    @Nullable
    public String getNewLine() {
        return newLine;
    }
    
    /**
     * @param newLine the newLine to set
     */
    public void setNewLine(@Nullable String newLine) {
        this.newLine = newLine;
    }
    
    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((newLine == null) ? 0 : newLine.hashCode());
        result = prime * result + ((oldLine == null) ? 0 : oldLine.hashCode());
        result = prime * result + ((tag == null) ? 0 : tag.hashCode());
        return result;
    }
    
    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        DiffRow other = (DiffRow) obj;
        if (newLine == null) {
            if (other.newLine != null)
                return false;
        } else if (!newLine.equals(other.newLine))
            return false;
        if (oldLine == null) {
            if (other.oldLine != null)
                return false;
        } else if (!oldLine.equals(other.oldLine))
            return false;
        if (tag == null) {
            if (other.tag != null)
                return false;
        } else if (!tag.equals(other.tag))
            return false;
        return true;
    }
    
    public String toString() {
        return "[" + this.tag + "," + this.oldLine + "," + this.newLine + "]";
    }
}