examples/hyphenation/src/org/apache/fop/hyphenation/TernaryTreeAnalysis.java

/*
 * 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.
 */

/* $Id$ */

package org.apache.fop.hyphenation;

import java.util.ArrayList;
import java.util.List;

/**
 * This class provides some useful methods to print the structure of a TernaryTree object
 */
public class TernaryTreeAnalysis {

    /**
     * The TernaryTree object to analyse
     */
    protected TernaryTree tt;

    /**
     * @param tt the TernaryTree object
     */
    public TernaryTreeAnalysis(TernaryTree tt) {
        this.tt = tt;
    }

    /**
     * Class representing a string of nodes in the tree representation of a TernaryTree
     */
    public static class NodeString {

        /**
         * The node string being constructed
         */
        public StringBuffer string = new StringBuffer();

        /**
         * The indent of the node string
         */
        public int indent;

        /**
         * The list of branchpoints into the high direction
         */
        public List high = new ArrayList();

        /**
         * The list of branchpoints into the low direction
         */
        public List low = new ArrayList();

        /**
         * @param indent the indent of the nodestring
         */
        public NodeString(int indent) {
            this.indent = indent;
            string.append("+");
        }

    }

    /**
     * Class representing a node of the TernaryTree object
     */
    protected class Node {

        /**
         * The index of the node
         */
        protected int index = 0;

        /**
         * The index of the high node
         */
        protected int high = 0;

        /**
         * The index of the high node
         */
        protected int low = 0;

        /**
         * The index of the equal node
         */
        protected int equal = 0;

        /**
         * The key following the node
         */
        protected String key = null;

        /**
         * True if this is a leaf node
         */
        protected boolean isLeafNode = false;

        /**
         * True if this is a packed node
         */
        protected boolean isPacked = false;

        /**
         * @param index the index of the node
         */
        protected Node(int index) {
            this.index = index;
            if (tt.sc[index] == 0) {
                isLeafNode = true;
            } else if (tt.sc[index] == 0xFFFF) {
                isLeafNode = true;
                isPacked = true;
                key = readKey().toString();
            } else {
                key = new String(tt.sc, index, 1);
                high = tt.hi[index];
                low = tt.lo[index];
                equal = tt.eq[index];
            }
        }

        private StringBuffer readKey() {
            StringBuffer s = new StringBuffer();
            int i = (int) tt.lo[index];
            char c = tt.kv.get(i);
            for (; c != 0; c = tt.kv.get(++i)) {
                s.append(c);
            }
            return s;
        }

        /**
         * Construct the string representation of the node
         * @return the string representing the node
         */
        public String toNodeString() {
            StringBuffer s = new StringBuffer();
            if (isLeafNode) {
                s.append("-" + index);
                if (isPacked) {
                    s.append(",=>'" + key + "'");
                }
                s.append(",leaf");
            } else {
                s.append("-" + index + "--" + key + "-");
            }
            return s.toString();
        }

        /**
         * Construct the compact string representation of the node
         * @return the string representing the node
         */
        public String toCompactString() {
            StringBuffer s = new StringBuffer();
            if (isLeafNode) {
                s.append("-" + index);
                if (isPacked) {
                    s.append(",=>'" + key + "'");
                }
                s.append(",leaf\n");
            } else {
                if (high != 0) {
                    s.append("(+-" + high + ")\n |\n");
                }
                s.append("-" + index + "- " + key + " (-" + equal + ")\n");
                if (low != 0) {
                    s.append(" |\n(+-" + low + ")\n");
                }
            }
            return s.toString();
        }

        /* (non-Javadoc)
         * @see java.lang.Object#toString()
         */
        public String toString() {
            StringBuffer s = new StringBuffer();
            s.append("Node " + index + ":\n");
            if (isLeafNode) {
                if (isPacked) {
                    s.append("key: " + key + "\n");
                }
            } else {
                s.append("high: " + (high == 0 ? "-" : String.valueOf(high))
                         + ", equal: " + equal
                         + ", low: " + (low == 0 ? "-" : String.valueOf(low))
                         + "\n");
                s.append("key: " + key + "\n");
            }
            return s.toString();
        }

    }

    /**
     * Construct the compact node representation of the TernaryTree object
     * @return the string representing the tree
     */
    public String toCompactNodes() {
        StringBuffer s = new StringBuffer();
        for (int i = 1; i < tt.sc.length; ++i) {
            if (i != 1) {
                s.append("\n");
            }
            s.append((new Node(i)).toCompactString());
        }
        return s.toString();
    }

    /**
     * Construct the node representation of the TernaryTree object
     * @return the string representing the tree
     */
    public String toNodes() {
        StringBuffer s = new StringBuffer();
        for (int i = 1; i < tt.sc.length; ++i) {
            if (i != 1) {
                s.append("\n");
            }
            s.append((new Node(i)).toString());
        }
        return s.toString();
    }

    private static StringBuffer toString(char[] c) {
        StringBuffer s = new StringBuffer();
        for (int i = 0; i < c.length; ++i) {
            s.append((int) c[i]);
            s.append(",");
        }
        return s;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    public String toString() {
        StringBuffer s = new StringBuffer();

        s.append("hi: ");
        s.append(toString(tt.hi));
        s.append("\n");

        s.append("eq: ");
        s.append(toString(tt.eq));
        s.append("\n");

        s.append("lo: ");
        s.append(toString(tt.lo));
        s.append("\n");

        s.append("sc: ");
        for (int i = 0; i < tt.sc.length; ++i) {
            if (tt.sc[i] == 0) {
                s.append("-");
            } else if (tt.sc[i] == 0xFFFF) {
                s.append("^");
            } else {
                s.append(tt.sc[i]);
            }
        }
        s.append("\n");

        s.append("kv: ");
        for (int i = 0; i < tt.kv.length(); ++i) {
            if (tt.kv.get(i) == 0) {
                s.append("-");
            } else {
                s.append(tt.kv.get(i));
            }
        }
        s.append("\n");

        s.append("freenode: ");
        s.append((int) tt.freenode);
        s.append("\n");

        s.append("root: ");
        s.append((int) tt.root);
        s.append("\n");

        return s.toString();
    }


}