78 lines
2.1 KiB
Java
78 lines
2.1 KiB
Java
package org.insa.graph.io;
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import java.io.DataInputStream;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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public abstract class BinaryReader {
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// Map version and magic number targeted for this reader.
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private int version;
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private int magicNumber;
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// InputStream
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protected DataInputStream dis;
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// List of observers
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protected List<GraphReaderObserver> observers = new ArrayList<>();
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protected BinaryReader(int magicNumber, int version, DataInputStream dis) {
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this.magicNumber = magicNumber;
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this.version = version;
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this.dis = dis;
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}
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/**
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* {@inheritDoc}
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*/
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public void addObserver(GraphReaderObserver observer) {
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observers.add(observer);
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}
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/**
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* @param version
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* @throws BadVersionException
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*/
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public void checkVersionOrThrow(int version) throws BadVersionException {
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if (this.version != version) {
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throw new BadVersionException(version, this.version);
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}
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}
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/**
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* @param magicNumber
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* @throws BadMagicNumberException
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*/
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public void checkMagicNumberOrThrow(int magicNumber) throws BadMagicNumberException {
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if (this.magicNumber != magicNumber) {
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throw new BadMagicNumberException(magicNumber, this.magicNumber);
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}
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}
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/**
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* Check if the next byte in the input stream correspond to the given byte. This
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* function consumes the next byte in the input stream.
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*
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* @param i Byte to check against.
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*
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* @throws IOException
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*/
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public void checkByteOrThrow(int i) throws IOException {
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if (dis.readUnsignedByte() != i) {
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throw new BadFormatException();
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}
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}
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/**
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* Read 24 bits from the stream and return the corresponding integer value.
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*
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* @return Integer value read from the next 24 bits of the stream.
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*
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* @throws IOException
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*/
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protected int read24bits() throws IOException {
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int x = dis.readUnsignedShort();
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return (x << 8) | dis.readUnsignedByte();
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}
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}
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