【Java开源代码栏目提醒】:网学会员为需要Java开源代码的朋友们搜集整理了GrepInputStream.java相关资料,希望对各位网友有所帮助!
package com.javapatterns.decorator.greps;
import java.io.FilterInputStream;
import java.io.DataInputStream;
import java.io.IOException;
public class GrepInputStream extends FilterInputStream
{
String substring;
DataInputStream in;
public GrepInputStream(DataInputStream in, String substring)
{
super(in);
this.in = in;
this.substring = substring;
}
// This is the filter: read lines from the DataInputStream,
// but only return the lines that contain the substring.
// When the DataInputStream returns null, we return null.
public final String readLine() throws IOException
{
String line;
do
{
line = in.readLine();
}
while ((line != null) && line.indexOf(substring) == -1);
return line;
}
}
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