78 lines
2.4 KiB
Java
78 lines
2.4 KiB
Java
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package edu.mit.broad.picard.metrics;
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import edu.mit.broad.picard.PicardException;
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import edu.mit.broad.picard.util.FormatUtil;
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import java.lang.reflect.Field;
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/**
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* A base class from which all Metric classes should inherit.
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*
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* @author Tim Fennell
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*/
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public class MetricBase {
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/**
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* An equals method that checks equality by asserting that the classes are of the exact
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* same type and that all public fields are equal.
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*
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* @param o an instance to compare to
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* @return true if they are equal, false otherwise
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*/
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public boolean equals(Object o) {
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if (o == null) return false;
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if (o.getClass() != getClass()) return false;
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// Loop through all the fields and check that they are either
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// null in both objects or equal in both objects
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for (Field f : getClass().getFields()) {
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try {
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Object lhs = f.get(this);
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Object rhs = f.get(o);
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if (lhs == null) {
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if (rhs == null) {
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// keep going
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}
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else if (rhs != null) {
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return false;
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}
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}
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else {
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if (lhs.equals(rhs)) {
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// keep going
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}
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else {
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return false;
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}
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}
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}
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catch (IllegalAccessException iae) {
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throw new PicardException("Could not read field " + f.getName() + " from a " + getClass().getSimpleName());
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}
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}
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// If we got this far all the fields are equal
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return true;
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}
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/** Converts the metric class to a human readable string. */
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public String toString() {
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StringBuilder buffer = new StringBuilder();
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FormatUtil formatter = new FormatUtil();
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for (Field f : getClass().getFields()) {
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try {
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buffer.append(f.getName());
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buffer.append("\t");
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buffer.append(formatter.format(f.get(this)));
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buffer.append("\n");
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}
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catch (IllegalAccessException iae) {
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throw new PicardException("Could not read field " + f.getName() + " from a " + getClass().getSimpleName());
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}
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}
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return buffer.toString();
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}
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}
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