content: /*
   *  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.
   */
  package org.apache.causeway.extensions.tabular.pdf.factory.internal;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.pdfbox.pdmodel.font.PDFont;
  
  import org.apache.causeway.extensions.tabular.pdf.factory.internal.Token.TokenType;
  
  final class PipelineLayer {
  
  	private final StringBuilder text = new StringBuilder();
  	private String lastTextToken = "";
  	private List<Token> tokens = new ArrayList<>();
  	private String trimmedLastTextToken = "";
  	private float width;
  	private float widthLastToken;
  	private float widthTrimmedLastToken;
  	private float widthCurrentText;
  
  	public boolean isEmpty() {
  		return tokens.isEmpty();
  	}
  
  	public void push(final Token token) {
  		tokens.add(token);
  	}
  
  	public void push(final PDFont font, final float fontSize, final Token token) throws IOException {
  		if (token.type().equals(TokenType.PADDING)) {
  			width += Float.parseFloat(token.text());
  		}
  		if (token.type().equals(TokenType.BULLET)) {
  			// just appending one space because our bullet width will be wide as one character of current font
  			text.append(token.text());
  			width += (token.getWidth(font) / 1000f * fontSize);
  		}
  
  		if (token.type().equals(TokenType.ORDERING)) {
  			// just appending one space because our bullet width will be wide as one character of current font
  			text.append(token.text());
  			width += (token.getWidth(font) / 1000f * fontSize);
  		}
  
  		if (token.type().equals(TokenType.TEXT)) {
  			text.append(lastTextToken);
  			width += widthLastToken;
  			lastTextToken = token.text();
  			trimmedLastTextToken = rtrim(lastTextToken);
  			widthLastToken = token.getWidth(font) / 1000f * fontSize;
  
  			if (trimmedLastTextToken.length() == lastTextToken.length()) {
  				widthTrimmedLastToken = widthLastToken;
  			} else {
  				widthTrimmedLastToken = (font.getStringWidth(trimmedLastTextToken) / 1000f * fontSize);
  			}
  
  			widthCurrentText = text.length() == 0 ? 0 :
  					(font.getStringWidth(text.toString()) / 1000f * fontSize);
  		}
  
  		push(token);
  	}
  
  	public void push(final PipelineLayer pipeline) {
  		text.append(lastTextToken);
  		width += widthLastToken;
  		text.append(pipeline.text);
  		if (pipeline.text.length() > 0) {
  			width += pipeline.widthCurrentText;
  		}
  		lastTextToken = pipeline.lastTextToken;
  		trimmedLastTextToken = pipeline.trimmedLastTextToken;
  		widthLastToken = pipeline.widthLastToken;
  		widthTrimmedLastToken = pipeline.widthTrimmedLastToken;
  		tokens.addAll(pipeline.tokens);
  
  		pipeline.reset();
  	}
  
  	public void reset() {
  		text.delete(0, text.length());
  		width = 0.0f;
  		lastTextToken = "";
  		trimmedLastTextToken = "";
  		widthLastToken = 0.0f;
  		widthTrimmedLastToken = 0.0f;
  		tokens.clear();
  	}
  
  	public String trimmedText() {
  		return text.toString() + trimmedLastTextToken;
  	}
  
  	public float width() {
  		return width + widthLastToken;
  	}
  
  	public float trimmedWidth() {
  		return width + widthTrimmedLastToken;
  	}
  
  	public List<Token> tokens() {
  		return new ArrayList<>(tokens);
  	}
  
  	@Override
  	public String toString() {
  		return text.toString() + "(" + lastTextToken + ") [width: " + width() + ", trimmed: " + trimmedWidth() + "]";
  	}
  
  	// -- HELPER
  
  	private static String rtrim(final String s) {
  	    int len = s.length();
  	    while ((len > 0) && (s.charAt(len - 1) <= ' ')) {
  	        len--;
  	    }
  	    if (len == s.length()) {
  	        return s;
  	    }
  	    if (len == 0) {
  	        return "";
  	    }
  	    return s.substring(0, len);
  	}
  }
  