package hep.aida.ref.histogram;
import hep.aida.IAxis;
/**
 * Variable-width axis; A reference implementation of hep.aida.IAxis.
 *
 * @author The AIDA team @ SLAC.
 * @version 1.0, 23/03/2000
 */
public class VariableAxis implements IAxis {
    private double min;
    private int bins;
    private double[] edges;
    /**
     * Constructs and returns an axis with the given bin edges.
     * Example: edges = (0.2, 1.0, 5.0) yields an axis with 2 in-range bins [0.2,1.0), [1.0,5.0) and 2 extra bins [-inf,0.2), [5.0,inf].
     * @param edges the bin boundaries the partition shall have;
     *        must be sorted ascending and must not contain multiple identical elements.
     * @throws IllegalArgumentException if edges.length < 1.
     */
    public VariableAxis(double[] edges) {
        if (edges.length < 1) throw new IllegalArgumentException();
        
        // check if really sorted and has no multiple identical elements
        for (int i=0; i= bins) return IAxis.OVERFLOW_BIN;
        return index;
    }
    public double lowerEdge() {
        return min;
    }
    /**
     * Returns a string representation of the specified array.  The string
     * representation consists of a list of the arrays's elements, enclosed in square brackets
     * ("[]").  Adjacent elements are separated by the characters
     * ", " (comma and space).
     * @return a string representation of the specified array.
     */
    protected static String toString(double[] array) {
        StringBuffer buf = new StringBuffer();
        buf.append("[");
        int maxIndex = array.length - 1;
        for (int i = 0; i <= maxIndex; i++) {
            buf.append(array[i]);
            if (i < maxIndex)
                buf.append(", ");
        }
        buf.append("]");
        return buf.toString();
    }
    public double upperEdge() {
        return edges[edges.length-1];
    }
    
    public boolean isFixedBinning() {
        return false;
    }
    
    
    /**
     * Check if two Axis are equal.
     * @param o the Object to check
     * @return true if o is an instance of FixedAxis and
     *         it has the same number of bins, minimum and bin width.
     */
    public boolean equals(Object o) {
        if (! ( o instanceof VariableAxis ) ) return false;
        VariableAxis other = (VariableAxis) o;
        if ( this.bins != other.bins ) return false;
        for ( int i = 0; i < bins; i ++ )
            if ( this.binUpperEdge(i) != other.binUpperEdge(i) ||  this.binLowerEdge(i) != other.binLowerEdge(i) ) return false;
        return true;
    }
    
    
}